NEW U.S. BATTERY PATENTS

Updated February 1, 1998

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JAPANESE BATTERY ABSTRACTS

 

2000-40505 Positive Electrode for Secondary Lithium Battery (Mitsubishi Electric Wire).

This patent is  related to a positive electrode for the battery. The positive electrode is made from 92 parts-wt. of LiCoO2 (mean particle size: about 20 microns), 5 parts-wt. of PVDF and 3 parts-wt. of acetylene black which are mixed with N-methyl-2-pyrolidone, applied to an Al foil and dried. The positive active material layer has a 20 mg/cm2 density, a 0.4%-wt. and less of LiOH content and a 500 ppm and less of water content. The battery uses the positive described above, a negative electrode of Li foil, a separator of porous polyethylene film, which are laminated, and an electrolyte of EC, ethylmethyl carbonate (in vol. ratio of 1:1) and 1 mol/l LiPF6. The coin type secondary lithium battery has a 88-96% discharge capacity at the 100th cycle to the first cycle, an excellent charge-discharge cycle characteristic and a long life. (M. Asano, K. Sawada, T. Shima, S. Hirotani) (Pub. 2/8/2000; Appl. 7/24/1998).

2000-48808 Method of Making Secondary Lithium-Ion Battery (Fukukawa Electric).

This patent is related to a negative electrode for the battery. The negative electrode is made from artificial graphite powder having a d(002) of 3.364 angstroms and PVDF which are kneaded with 1-methyl-2-pyrolidone, applied to a Cu foil, dried and pressed. The negative electrode is then cathodically electrolyzed with a counter and a reference electrode of Li foils in an electrolyte of EC-DMC-1 mol/l LiClO4 at +0.15V vs. lithium; then anodically electrolyzed at +3V to remove the lithium. The battery uses the negative electrode described above; a positive electrode of LiCoO2 and carbon black which are kneaded with acrylonitrile-butadiene copolymer latex and carboxymethyl cellulose aqueous solution, applied to an Al foil, dried and pressed; a separator of polypropylene nonwoven fabric; which are laminated and inserted into a coin cell case; and an electrolyte of EC, DMC (vol. ratio of 1:1) and 1 mol/l LiClO4. The battery has a 90% or more discharge capacity at 100th and 200th cycles compared to that of the first cycle, and an improved cycle characteristic. (T. Ono) (Pub. 2/18/2000; Appl. 7/27/1998).

2000-48811 Method of Making Negative Electrode Material for Secondary Li-Ion Battery, and the Battery (Adchemco).

This patent is related to a negative electrode for a battery. Al2O3 is added to pitch having a softening point of 105 C then heat-treated under pressure, and the softening point is raised to 358 C, pulverized, oxidized at 260 C in air, carbonized, then graphitized at 3000 C. The graphite powder has a d of 0.3358 nm, an Lc > 100 nm, an La of > 100 nm and an Al content of 2.1 wt.%. The negative electrode is made from a 95 parts-wt. of graphite powder and 5 parts-wt. of the binder which is composed of a 33 wt.% PTFE, 66 wt.% acetylene black and 1 wt.% surface active agent, which are kneaded and formed into a pellet. The battery uses the negative electrode described above, a counter electrode of Li foil, and an electrolyte of EC, diethylene carbonate (vol. ratio of 1:1) and 1 mol/l LiClO4. The battery has a flat discharge potential, an excellent cycle characteristic and uses the graphite powder having a high density and a high capacity. (T. Shiode, Y. Magi, H. Morotomi, H. Okamoto) (Pub. 2/18/2000; Appl. 5/19/1999).

2000-67852 Secondary Lithium Battery (Pioneer).

This patent is related to a positive electrode for the battery. The positive electrode is made from Li-thiocyanurate and PAN (in the wt.-ratio of 2.2:1) to which is added N-methyl-2-pyrolidone, then applied to a carbon film lined with Ti foil as the positive current collector, heat-treated at 80 C for 15 minutes in an argon atmosphere and dried at 80 C for one hour in a vacuum. The battery uses the positive electrode above, a negative electrode of Li foil lined with Ti foil as the negative current collector, and a solid electrolyte (the separator) of EC, PC (vol. ratio of 4:6) and 1.65 mol/l LiBF4 which are mixed with polyacrylonitrile-methylacrylate (vol. ratio of 9:1), gelantized at –20 C and formed into a solid electrolyte film having a thickness of several 10 microns to 0.8 mm. The positive and negative electrodes and the solid electrolyte (the separator) are laminated. The battery has an excellent cycling characteristic, a high discharge capacity and a high energy density. (T. Tsuji, T. Miyake, S. Yanagisawa) (Pub. 3/3/2000; Appl. 8/21/1998).

2000-77060 Lithium-ion Battery (Sanyo Electric).

This patent is related to a positive electrode for the battery. The positive electrode is made from a substrate of Al foil, two conductive layers of graphite, etc., and polyethylene oxide (PEO), and two active material layers of LiCoO2, acetylene black, graphite and PVDF. The positive electrode has a double layer structure. The battery uses the positive electrode above; a negative electrode of a substrate of Cu foil, graphite and PVDF; microporous polyethylene separators; which are wound; and an electrolyte of EC, DEC and 1 mol/l LiPF6. The positive electrode is broken by the decomposition gas of PEO at high temperature and the battery is disconnected from the charging circuit. Thus the battery maintains its reliability. (T. Sunano) (Pub. 3/14/2000; Appl. 8/31/1998).

2000-82459 Method of Making Secondary Battery Using Nonaqueous Electrolyte (SII Microparts).

This patent is related to a working electrode for the battery. The working electrode uses an active material of Si1-yMyOz (0<y<0.1, 0<z<2, M=W, Sn, Pb or B) and is made from 65 wt.-parts of the active material, 20 wt.-parts of graphite and 15 wt.-parts of crosslinking acrylic resin binder which are mixed, formed into a pellet and adhered to a current collector. The battery uses the working electrode above, a counter electrode of Li-Al alloy, a porous polypropylene separator, which are laminated, and an electrolyte of PC, EC, 1,2-DME (in the vol. ratio of 1:1:2) and 1 mol/l LiClO4. The battery has a high charge/discharge capacity, a high voltage with a high energy density and an excellent charge/discharge characteristic with a high current. (K. Tawara, F. Iwasaki, T. Sakata, S. Yahagi, H. Ishikawa) (Pub. 3/21/2000; Appl. 1/24/94).

2000-100421 Secondary Battery Using Nonaqueous Electrolyte (Hitachi Maxell).

This patent is related to a nonaqueous electrolyte for a battery. The nonaqueous electrolyte is composed of trimethyl phosphate, EC, and dimethyl fumarate (in vol. ratio of 84:8:8) and 1.0 mol/l LiPF6. The battery uses a positive electrode of 91 parts-wt. of LiCoO2, 6 parts-wt. of graphite and 3 parts-wt. of PVDF which are mixed, N-methyl pyrolidone (NMP) added, applied to a Al foil, dried and pressed; a negative electrode of 90 parts-wt. of crystalline graphite (d(002)=0.336 nm, Lc=42 nm) and 10 parts-wt. of PVDF which are mixed, NMP added, applied to a Cu foil, dried and pressed; microporous polyethylene separators; which are wound, put into the battery case and then the nonaqueous electrolyte poured into the battery case. The battery has a high initial charge/discharge efficiency and an excellent load characteristic. (N. Shinoda) (Pub. 4/7/2000; Appl. 9/28/1998).

2000-106174 Secondary Battery Using Nonaqueous Electrolyte (Matsushita Electric).

This patent is related to a positive electrode for the battery. The positive electrode is made from 100 parts-wt. of LiCoO2, 5 parts-wt. of acetylene black, 7 parts-wt. of a fluororesin binder, carboxymethyl cellulose (CMC) aq. solution and 100-10,000 ppm-wt. of MoO3 (to 100 parts-wt. of LiCoO2) which are mixed, applied to an Al foil, dried and pressed. The battery uses the positive electrode above; a negative electrode of 100 parts-wt. of carbon powder, 10 parts-wt. of a fluororesin binder and CMC aqueous solution which are mixed, applied to a Cu foil, dried and pressed; separators; which are wound, and an electrolyte of EC, DEC (vol. ratio of 1:1) and 1 mol/l LiPF6. The battery has no deterioration of the current and battery characteristics, because no corrosion on the Al foil by MoO3 in the positive electrode. (H. Matsuno, H. Murai, T. Hashimoto, T. Sugimoto) (Pub. 4/11/2000; Appl. 9/30/98).

2000-113877 Secondary Lithium Battery (Hitachi).

This patent is related to a negative electrode for the battery. The negative electrode is made from 1 part-wt. of acetylene black having a specific surface area of 70 m2/g and 19.8 wt.% of Ag, and 9 parts-wt. of graphite having a d(002) of 0.336 nm, Lc of 100 nm and a specific surface area of 3.2 m2/g; which are mixed, PVDF-n-methyl pyrolidone solution added, mixed, applied to a Cu foil, dried and pressed. The battery uses the negative electrode above, a counter electrode of metallic Li foil, a polyethylne separator, which are assembled, and an electrolyte of EC, DMC and 1 mol/l LiPF6. The battery has a high discharge capacity and an excellent cycling characteristic (S. Takeuchi, H. Honbo, J. Kaneda, Y. Muranaka) (Pub. 4/21/2000; Appl. 10/7/98).

1999-288715 Secondary Battery Using Nonaqueous Electrolyte (Matsushita Electric).

This patent relates to a negative electrode for the battery. The negative electrode is made from SiF4, graphite powder and Teflon binder (wt. ratio = 6:3:1) which are mixed with a solvent, applied to a Cu foil and dried. The battery uses the negative electrode described above; a positive electrode of LiMn1.8Co0.2O4, carbon powder and PTFE dispersion (wt. ratio = 100:10:8) which are mixed with water, applied to a Ti foil and dried; microporous polypropylene separators; which are wound; and an electrolyte of EC, DME (vol. ratio = 1:1 and 1 mol/l LiClO4. The battery has a high discharge capacity and an improved cycle life. (Y. Bito, T. Sato, H. Matsuda, Y. Toyoguchi) (Pub. 10/19/99; Appl. 4/3/98).

1999-288716 Secondary Li-Ion Battery (Hitachi Maxell).

This patent relates to a positive electrode for the battery. The positive electrode is made from LiNi0.8Co0.17O2, crystalline graphite, ball-like carbon and PVDF (wt. ratio = 1oo:5:1:4) which are mixed with N-methyl pyrolidone (NMP), applied to an Al foil, dried and rolled. The battery uses the positive electrode above; a negative electrode of crystalline graphite (d002=0.336 nm, Lc=42 nm, aspect ratio=10, mean particle size=10 microns) and PVDF (wt. ratio = 10:1) which are mixed with NMP, applied to a Cu foil, dried and rolled; microporous polyethylene separators; which are wound; and an electrolyte of EC, ethylmethyl carbonate (vol. ratio = 1:2) and 1 mol/l LiPF6. The battery has a high capacity, an excellent heavy load characteristic and a high rate discharge at low temperature. (H. Toshio) (Pub. 10/19/99; Appl. 3/31/98).

11-339794 Battery Using Nonaqueous Electrolyte (Matsushita Electric).

This patent relates to a positive electrode for the battery. The positive active material is made of MnO2 which is mixed with 0.5 wt.% B2O3 and baked at about 400C for eight hours. The positive electrode is made from the positive active material described above and other materials which are mixed, applied to an Al foil, dried and pressed. The battery uses the positive electrode described above; a negative electrode of Li foil; separators; which are wound; and an electrolyte of PC, 1,2-DME and 0.5 mol/l LiP(SO4)3. The battery has no generation of Li2O film on the negative electrode, no rise in impedance, a high capacity and a long life. (T. Tanahashi, T. Inui, S. Ogawa) (Pub. 12/10/99; Appl. 5/29/98).

11-339797 Secondary Battery Using Nonaqueous Electrolyte (Fuji Electrochem.).

This patent relates to a positive electrode for the battery. The positive electrode is made from 76 wt.% Li1.8K0.2SnO3, 20 wt.% graphite and 4 wt.% PTFE which are mixed, pressed onto an Al foil and dried. The battery used the positive electrode described above; a negative electrode of metallic lithium; a microporous polypropylene separator; which are laminated; and an electrolyte of EC, DEC (in the vol. ratio of 1:1) and 1M LiPF6. The battery has an improved charge capacity and cycle characteristic by using the Li1.8K0.2SnO3. (T. Yagi, S. Fujii) (Pub. 12/10/99; Appl. 5/25/98).

11-339799 Method of Making Negative Electrode Material for Secondary Battery Using Nonaqueous Electrolyte (Matsushita Electric).

This patent relates to a negative electrode for the battery. The negative electrode material is made from an inorganic of (methyl)polysilasane which is baked at 600-700 C under a nitrogen gas stream and formed into a ceramic of silicon nitride containing carbon. The negative electrode is made from 90 part.-wt. of methyl polysilansane and 10 parts-wts. of PVDF which are mixed, pressed into a negative current collector of stainless steel mesh, dried, degassed, baked at 600 C under a nitrogen gas stream and formed into a ceramic of silicon nitride containing carbon. The battery uses the negative electrode described above; a positive electrode of LiCoO2, etc.; a microporous polypropylene separator; which are laminated; and an electrolyte of EC, 1,3-DME (in the volume ratio of 1:1) and 1 mol/l LiClO4. The battery has a high capacity and no deposition of needle-like metallic lithium on the surface of the negative electrode during charge and discharging. (Y. Nitta, H. Shimamura) (Pub. 10/10/99; Appl. 5/28/98).

11-339800 Secondary Battery Using Nonaqueous Electrolyte (Matsushita Electric).

This patent relates to a positive electrode for the battery. The positive electrode is made from Li2NiF4, artificial graphite and PVDF (in the wt.-ratio of 80:10:10) to which are added pyrolidone, kneaded, applied to an Al foil and dried. The battery uses the positive electrode described above; a negative electrode of lithium foil; a porous polypropylene separator; which are laminated; and an electrolyte of PC and 1 mol/l LiPF6. The battery has a high discharge voltage. (H. Kinomiya, Y. Nitta, K. Okamura) (Pub. 12/10/99; Appl. 5/28/98).

11-345609 Secondary Lithium Battery (Mitsubishi Chemical).

This patent relates to a positive electrode for the battery. The positive electrode is made from 90 parts-wt. of LiCoO2 having an aspect ratio of 2.2 or 1.7, 5 parts-wt. of acetylene black and 5 parts-wt. of PVDF binder to which are added 100 parts-wt. of N-methyl pyrolidone (NMP), kneaded, applied to an Al foil, dried and impregnated with the electrolyte described below. The battery uses the positive electrode described above; a negative electrode of 90 parts-wt. of graphite and 10 parts-wt. of PVDF binder to which are added 150 parts-wt. of NMP, kneaded, applied to a Cu foil, dried and impregnated with the electrolyte to be described below; a separator of polypropylene nonwoven fabric which is impregnated with the electrolyte to be described below; which are laminated; and the electrolyte of 46 parts-wt. of PC, 46 parts-wt. of EC and 8 parts-wt. of LiClO4. The battery has a high capacity and a high rate characteristic using LiCoO2 having an aspect ratio of 2.2 or 1.7. (H. Machino, A. Matsumoto, R. Shibuta) (Pub. 12/14/99; Appl. 6/2/98).

11-345615 Lithium-Ion Secondary Battery Using Nonaqueous Electrolyte (Fuji Film).

This patent relates to a positive electrode for the battery. The positive active material consists of LiNi0.08Co0.02O2 which is made from LiOH-H2O, Ni(NO3)2-1.5H2O and Co(OH)2 [in the molar ratio of 1:0.8:0.2)], which are mixed, heat-treated at 180 C for 2 hours in an oxygen atmosphere, pre-baked at 650 C for 6 hours, mixed again, baked at 850 C for 8 hours and then slowly cooled down. The positive electrode is made from 90%-wt. of LiNi0.08Co0.02O2 above, 6%-wt. of acetylene black, 3%-wt. of PTFE and 1%-wt. of Na-polyacrylate to which is added water, kneaded, applied to an Al foil, dried and pressed. The battery uses the positive electrode above; a negative electrode of 95%-wt. of natural flake graphite and 5%-wt. of PVDF to which is added N-methyl pyrolidone, mixed, applied to a Cu foil, dried and pressed; a porous polyethylene separator; which are wound; and an electrolyte of EC, BC, DMC (in the volume ratio of 2:2:6) and 1 mol/l LiPF6. The battery has excellent charge-discharge characteristics, cycle characteristics and a long life by using LiNi0.08Co0.02O2 which is stabilizes the charge-discharge characteristics (T. Miyasaka) (Pub. 12/14/99; Appl. 6/2/98).

11-354104 Method of Making Secondary Battery Using Nonaqueous Electrolyte and Electrode (Denso).

This patent relates to a negative electrode for the battery. The negative electrode is made from 95%-wt. of mesophase carbon microbeads and 5%-wt. of PVDF to which is added N-methyl pyrolidone (NMP), mixed, applied to a Cu foil, dried and immersed into 1%-wt. of 3,3,3-trifluoro-propyl-trimethoxy-silane-95%-wt. of ethanol-5%-wt. of water solution, dried and pressed. The battery uses the negative electrode described above; a positive electrode of 87%-wt. of LiMn2O4, 10%-wt. of carbon powder and 3%-wt. of PVDF to which is added NMP, mixed, applied to an Al foil, dried and pressed; a microporous polyethylene separator; which are laminated; and an electrolyte of EC, DEC (in the vol. ratio of 30:70) and 1 mol/l LiPF6. The battery has a small retention capacity, a high charge-discharge efficiency and an excellent cycle characteristic by using the 3,3,3-trifluoro-propyl-trimethoxy-silane. (M. Ito, K. Usami, R. Shinaki, K. Ueshima, K. Kami) (Pub. 12/24/99; Appl. 3/18/99).

11-354117 Secondary Battery Using Nonaqueous Electrolyte (Fuji Electrochem.).

This patent relates to a positive electrode for the battery. The positive active material consists of Ca3LiCoV3O12 having a crystal structure of the garnet type cubic system which is made from CaCO3, Li3CO3, CoO, and V2O5 (in the molar ratio of 6:1:2:3), mixed, formed into a pellet and baked at 750 C for 20 hours in air. The positive electrode is made from 76%-wt. of the Ca3LiCoV3O12 above, 20%-wt. of graphite and 4%-wt. of PTFE binder which are mixed then pressed into a Ni net. The battery uses the positive electrode above; a negative electrode of Li foil; a microporous polypropylene separator; which are laminated; and an electrolyte of EC, DEC (in the vol. ratio of 1:1) and 1M LiPF6. The battery has an improved cycle characteristic (S. Fuji) (Pub. 12/24/99; Appl. 6/4/98).

11-354120 Electrode Material for Secondary Li-Ion Battery (Sumitomo Dures).

This patent relates to a negative for the battery. The negative active material consists of carbon containing 5%-wt. of nitrogen which is made from aniline resin, cured at 200 C and baked at 1000 C for 3 hours in the nitrogen atmosphere. The negative electrode is made from 90 parts-wt. of the carbon containing 55-wt. of the nitrogen above and 10 parts-wt. of PTFE binder which are mixed and formed into a pellet. The battery uses the negative electrode above; a positive electrode of 84 parts-wt. of Li0.5Co0.5V0.5O2.5, 10 parts-wt. of acetylene black and 6 parts-wt. of PTFE binder which are mixed, dried and formed into a pellet; a microporous polypropylene separator; which are laminated; and an electrolyte containing 1 mol/l LiBF4. The carbon containing 5%-wt. of nitrogen has a high conductivity, a high energy density, an excellent cycle characteristic and high safety. (Y. Matsuo, T. Sasaki) (Pub. 12/24/99; Appl. 6/10/98).

11-354127 Secondary Li Battery (Hitachi Maxell).

This patent relates to binders of the positive and negative electrodes for the battery. The positive electrode is made from 91 parts-wt. of LiCoO2, 6 parts-wt. of crystalline graphite, 2.4 parts-2t. of hydroxy propyl cellulose and 0.6 parts-wt. of polyethylene glycol to which is added water, mixed, applied to an Al foil, dried and pressed. The negative electrode is made from 95 parts-wt. artificial graphite, 4 parts-wt. of hydroxyl propyl cellulose and 1 part-wt. of polyethylene glycol to which is added 105 parts-wt. of water, mixed, applied to a Cu foil, dried and pressed. The battery uses the positive electrode described above; the negative electrode described above; microporous polyethylene separators; which are wound; and an electrolyte of EC, ethylmethyl carbonate (in the vol. ratio of 1:1) and 1 mol/l LiPF6. The battery has no cracking and no peeling of the electrodes, a high battery capacity and a small deterioration rate of capacity during cycling. (H. Akabane, A. Kawakami, J. Ozaki) (Pub. 12/24/99; Appl. 6/10/98).

11-317225 Method of Making Positive Active Material for Secondary Li Battery (Mitsubishi Material).

This patent relates to a positive electrode for the battery. The positive active material is made from 33.75%-wt. of Na2CO3, 61.42%-wt. of MnO2 and 4.88%-wt. of K2CO3 which are heat-treated at 700 C for 10 hours in a nitrogen atmosphere, treated with 3 mol/l LiCl-n-hexanol and formed into the positive active material of Na0.1K0.1Li0.8MnO2. The positive electrode is made from 0.84 g of Na0.1K0.1Li0.8MnO2, 2 g of acetone as a solvent and 0.08 g of PVDF as a binder which are formed into a film and hot-pressed into an Al mesh. The cell uses the positive film above, counter and reference electrodes of metallic Li and an electrolyte of an inorganic Li salt and carbonate ester as the solvent. The cell has an very small decrease in discharge capacity after 50 cycles (T. Sakurai, T. Sugihara) (Pub. 11/16/99; Appl. 4/30/98).