30results about How to "Suppress capacity deterioration" patented technology

A negative electrode of a lithium secondary battery has a negative electrode active material including at least one element of silicon and tin. Capacities of the positive electrode and the negative electrode of the lithium secondary battery are set as follows. In a completely charged state of the lithium secondary battery charged by a predetermined charging method, the positive electrode active material and the negative electrode active material are in a first partially charged state, respectively. In a completely discharged state of the lithium secondary battery discharged by a predetermined discharging method, the negative electrode active material is in a second partially charged state.

The invention relates to a method of manufacturing a negative electrode for a solid-state battery, a method of manufacturing a solid-state battery, and negative electrode slurry. Provided is a method of manufacturing a negative electrode for a solid-state battery, the method including: a step of mixing a negative electrode active material, a sulfide solid electrolyte, a binder, and a solvent with each other to prepare a negative electrode slurry; a step of applying the prepared negative electrode slurry to a surface of a solid electrolyte layer of the solid-state battery or a substrate of the negative electrode; and a step of drying the applied negative electrode slurry. In this method, the solvent is butyl butyrate, and the binder is a copolymer containing a vinylidene fluoride (VDF) monomer unit and a hexafluoropropylene (HFP) monomer unit, in which a molar ratio of the HFP monomer unit to a total amount of the VDF monomer unit and the HFP monomer unit is 10% to 25%.

Disclosed is a non-aqueous electrolyte rechargeable battery capable of high-voltage recharging, and which alleviates deterioration in charge capacity due to being stored after recharging in low-temperature environments. The non-aqueous electrolyte rechargeable battery (10) with lithium reference cathode active material potential of 4.35-4.60V comprises a cathode pole plate (11), an anode pole plate (12), a non-aqueous electrolyte, and a separator (13). A layer of inorganic particles is disposed upon the surface of the cathode pole plate (11), and holes upon the separator (13) employ an average diameter of 0.15[mu]m-0.3[mu]m, inclusive. The layer of inorganic particles disposed upon the surface of the cathode pole plate (11) would preferably contain either titanium oxide or aluminum oxide.

The invention provides an electrochemical cell, which can avoid the cracks in the negative electrode because of the volume expansion or shrinking during the cell charge / discharge process and has the advantages of high reliability, high capacity, and extremely long circulation service life. The electrochemical cell is composed of a positive electrode (30), a negative electrode (40), electrolyte containing an electrolyte-supportive solvent and a non-aqueous solvent, and a partition plate (5). The active substance in the negative electrode (40) is composed of the following particles which comprises at least a Si element and can be reversibly inserted into or removed off alkaline metal ions or alkaline earth metal ions. The particles also comprises at least one component of a first added element M comprising at least one element of B and P, and a second added element R comprising at least one element of In, Sn, Ti, Al, Ge, C, and Zr, wherein the weight of M and R is in a range of 1 ppm to 20% of the total weight of the Si element.

A secondary battery having an electrode active material mainly composed of an organic compound that includes, in a constituent unit, at least one compound selected from the group consisting of a dithione compound having a dithione structure, a dione compound having a dione structure, an organic radical compound containing a stable radical group and a diamine compound having a diamine structure. The secondary battery also has an electrolyte that contains a chain sulfone compound.

A nonaqueous electrolyte solution including a nonaqueous solvent; an electrolyte; and a combustion inhibitor, in which the combustion inhibitor contains a phosphazene compound, and specific conditions are defined by boiling points of a combustion inhibitor, a boiling point of a solvent, and the like.

The nonaqueous electrolyte secondary battery provided by the present invention has a positive electrode 50 that has a positive electrode active material layer 54, a negative electrode 60 that has a negative electrode active material layer 64, and separators 70, 72 interposed between the positive electrode active material layer 54 and the negative electrode active material layer 64. The positive electrode active material layer 54 contains a positive electrode active material and an inorganic phosphate compound that contains an alkali metal and / or an alkaline-earth metal. A phosphate ion scavenger that scavenges a phosphate ion is disposed between the positive electrode active material layer 54 and the negative electrode active material layer 64 and / or in the negative electrode active material layer 64.

Provided are a secondary battery nonaqueous electrolytic solution that has excellent oxidation resistance, that suppresses a reaction between the nonaqueous electrolytic solution and an electrode, that suppresses decomposition even under high-voltage conditions, and that can suppress capacity deterioration of the secondary battery and gas generation therein, as well as a nonaqueous electrolyte secondary battery using the nonaqueous electrolytic solution. Provided is a secondary battery nonaqueous electrolytic solution characterized by including a nonaqueous solvent including an ester having a 3,3,3-trifluoropropionate group represented by formula 1, a fluorinated cyclic carbonate that is a 4-fluoroethylene carbonate (FEC) or a derivative thereof, and at least one selected from among a cyclic carbonate, a chain carbonate, and a fluorinated chain carboxylic acid ester; and a lithium salt serving as an electrolyte.

Provided is an graphite material for negative electrodes, which is capable of mitigating the capacitance degradation that accompanies repeated charge / discharge cycles, storage in a charged state, and float charging. Provided is a manufacturing method for a graphite material for the negative electrode of a lithium ion secondary battery, wherein the starting material carbon composition has an hydrogen atom to carbon atom atomic ratio (H / C) of 0.30-0.50, and a microstrength of 7-17 mass%.

An auxiliary power unit of the present invention has an auxiliary lithium-ion secondary battery, a charge connector connected to the auxiliary lithium-ion secondary battery and adapted to receive power from an external charger, and a supply connector connected to the auxiliary lithium-ion secondary battery and adapted to supply power of the auxiliary lithium-ion secondary battery to an external portable device, and the auxiliary lithium-ion secondary battery is constructed so that each of thicknesses of cathode active material and anode active material layers is in the range of 10 to 40 mum.

Provided is a carbon material for use in lithium ion secondary battery negative electrodes which maintains a high charge-discharge capacity and is capable of suppressing capacity degradation accompanying repeated charge / discharge cycles, storage in a charged state, and floating charging. This carbon material for a lithium ion secondary battery negative electrode comprises particles having a laminated structure of multiple plates obtained from a coking coal composition obtained by the delayed coking method under the condition that the ratio of the total of the generation rates (mass%) of a one-carbon hydrocarbon gas (C1 gas), a two-carbon hydrocarbon gas (C2 gas) and a hydrogen gas generated by coking processing of heavy oils, over the formation rate (mass%) of the coking coal composition (total of generation rates / formation rate) is 0.30-0.60. Said structure of is curved into a bow shape, and, in each plate, defining T as the average plate thickness, H as the average bow height including the plate thickness, and L as the average length in the vertical direction, L / T is 5.0 or greater, and H / T is 1.10-1.25.

The present invention provides a nonaqueous electrolyte secondary battery that can be charged at high voltage and suppress capacity deterioration after charged storage in a high temperature environment.A nonaqueous electrolyte secondary battery 10 includes a positive electrode sheet 11, a negative electrode sheet 12, a nonaqueous electrolyte, and a separator 13, and the positive electrode active material has a potential of 4.35 to 4.60 V based on lithium. The positive electrode sheet 11 has a surface provided with an inorganic particle layer. The separator 13 has an average pore size of 0.15 μm or more and 0.3 μm or less. It is preferable that the inorganic particle layer provided to the surface of the positive electrode sheet 11 contain titanium oxide or aluminum oxide.

A nonaqueous electrolyte solution which contains a nonaqueous solvent and a compound represented by formula (1). (In formula (1), each of R1-R5 independently represents a hydrogen atom or an optionally substituted alkyl group having 1-3 carbon atoms; R6 represents an organic group having 1-8 carbon atoms, which optionally has a heteroatom; X represents a carbon atom, a sulfur atom or a phosphorusatom; in cases where X is a carbon atom, l = 0, m = 1 and n = 1; in cases where X is a sulfur atom, l = 0, m = 2 and n = 1; in cases where X is a phosphorus atom, l = 0, m = 1 and n = 2, or alternatively, l = 1, m = 1 and n = 1; k represents an integer of from 2 to 4 (inclusive); and Y represents a direct bond or a linking group having 1-8 carbon atoms, which optionally has a heteroatom, providedthat in cases where Y is a direct bond, there is an X-X bond and k = 2.)

A lithium-ion secondary battery of the present invention includes a cathode including an electrode material having electrode active material particles and an oxide coat and a carbonaceous film which coat surfaces of the electrode active material particles, an anode including a carbon-based active material, and an electrolytic solution, and the electrolytic solution does not substantially include additives for stabilizing a coat formed on a surface of the anode.

The nonaqueous electrolyte secondary battery provided by the present invention has a positive electrode 50 that has a positive electrode active material layer 54, a negative electrode 60 that has a negative electrode active material layer 64, and separators 70, 72 interposed between the positive electrode active material layer 54 and the negative electrode active material layer 64. The positive electrode active material layer 54 contains a positive electrode active material and an inorganic phosphate compound that contains an alkali metal and / or an alkaline-earth metal. A phosphate ion scavenger that scavenges a phosphate ion is disposed between the positive electrode active material layer 54 and the negative electrode active material layer 64 and / or in the negative electrode active material layer 64.

The invention provides an electrochemical cell, which can avoid the cracks in the negative electrode because of the volume expansion or shrinking during the cell charge / discharge process and has the advantages of high reliability, high capacity, and extremely long circulation service life. The electrochemical cell is composed of a positive electrode (30), a negative electrode (40), electrolyte containing an electrolyte-supportive solvent and a non-aqueous solvent, and a partition plate (5). The active substance in the negative electrode (40) is composed of the following particles which comprises at least a Si element and can be reversibly inserted into or removed off alkaline metal ions or alkaline earth metal ions. The particles also comprises at least one component of a first added element M comprising at least one element of B and P, and a second added element R comprising at least one element of In, Sn, Ti, Al, Ge, C, and Zr, wherein the weight of M and R is in a range of 1 ppm to 20% of the total weight of the Si element.

A negative electrode active material for a rechargeable battery comprises: a silicon composite containing a silicon compound and at least one carbon material selected from among graphite, graphitization-resistant carbon and soft carbon; a self-assembled monomolecular film which covers the surface of the silicon composite and which has an amino group; and a carbon compound containing carbon atoms as the principal component thereof, the carbon compound being bonded to the self-assembled monomolecular film with an amino group interposed therebetween.

A graphite material for a negative electrode is provided which can suppress capacity degradation due to repeated charging and discharging cycles, storage in a charged state, and floating charging. A method of manufacturing a graphite material for a negative electrode of a lithium ion secondary battery is provided in which an atomic ratio H / C of hydrogen atoms H and carbon atoms C in the raw coke composition is in a range of 0.30 to 0.50 and a microstrength of the raw coke composition is in a range of 7 wt% to 17 wt%.

Provided is a lithium ion secondary battery with reduced battery resistance, this lithium ion secondary battery using a positive electrode active material with a high potential and a phosphate-based solid electrolyte. The lithium ion secondary battery disclosed herein includes a positive electrode, a negative electrode, and a nonaqueous electrolytic solution. The positive electrode has a positive electrode active material layer including a positive electrode active material having an operation upper limit potential of at least 4.6 V relative to metallic lithium and a phosphate-based solid electrolyte. The nonaqueous electrolytic solution includes a boric acid ester including a fluorine atom.

Provided is a lithium secondary battery of an integrally sintered body plate type where a positive electrode layer, a ceramic separator, and a negative electrode layer are mutually integrated, the lithium secondary battery, despite this configuration, still being capable of suppressing separation between layers of the integrated sintered plate caused by the exposure to a physical impact applied when the battery is assembled, and capable of suppressing capacity deterioration that can occur when the battery is stored in a charged state. This lithium secondary battery comprises: a positive electrode layer constituted of a lithium complex oxide sintered body; a negative electrode layer constituted of a titanium-containing sintered body; a ceramic separator interposed between the positive electrode layer and the negative electrode layer; an electrolyte impregnated at least into the ceramic separator; and a sealed space. In the sealed space, provided are the positive electrode layer, the negative electrode layer, the ceramic separator, and an exterior body accommodating the electrolyte. The positive electrode layer, the ceramic separator and the negative electrode layer together form one integrated sintered body plate, and the entirety of the integrated sintered body plate is coated with a metal oxide layer.

A negative electrode of a lithium secondary battery has a negative electrode active material including at least one element of silicon and tin. Capacities of the positive electrode and the negative electrode of the lithium secondary battery are set as follows. In a completely charged state of the lithium secondary battery charged by a predetermined charging method, the positive electrode active material and the negative electrode active material are in a first partially charged state, respectively. In a completely discharged state of the lithium secondary battery discharged by a predetermined discharging method, the negative electrode active material is in a second partially charged state.

Provided is a non-aqueous electrolyte secondary battery using a spinel-type manganese-containing composite oxide, in which the capacity deterioration in repeated charging and discharging at a high temperature is suppressed. A non-aqueous electrolyte secondary battery disclosed herein includes a positive electrode, a negative electrode, and a non-aqueous electrolytic solution. The positive electrode includes a positive electrode active material layer containing a positive electrode active material. The positive electrode active material includes a lithium composite oxide having a spinel-type crystal structure and including Mn. The positive electrode active material layer includes 0.05% by mass or more and 1.0% by mass or less of orthophosphoric acid with respect to the positive electrode active material. The negative electrode includes a negative electrode active material layer containing a negative electrode active material. The negative electrode active material is graphite. The non-aqueous electrolytic solution includes a fluorine-containing lithium salt.

Provided is a lithium ion secondary battery with reduced battery resistance, this lithium ion secondary battery using a positive electrode active material with a high potential and a phosphate-based solid electrolyte. The lithium ion secondary battery disclosed herein includes a positive electrode, a negative electrode, and a nonaqueous electrolytic solution. The positive electrode has a positive electrode active material layer including a positive electrode active material having an operation upper limit potential of at least 4.6 V relative to metallic lithium and a phosphate-based solid electrolyte. The nonaqueous electrolytic solution includes a boric acid ester including a fluorine atom.

A nonaqueous electrolyte secondary battery is provided which is suppressed in capacity deterioration upon repeating charging and discharging irrespective of cracks being formed in a lithium manganese oxide particle having a spinel type crystal structure. The nonaqueous electrolyte secondary battery herein disclosed includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer includes lithium manganese oxide particles having a spinel type crystal structure as the positive electrode active material. At least a part of the lithium manganese oxide particles has a cracked part. The lithium manganese oxide particles have a coating film on the particle surface including the surface of the cracked part. The coating film contains a P component including a LiMnPO4 component, and a F component.