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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in secondary batteries, batteries, battery electrodes, etc., can solve problems such as ignition, achieve high output, high capacity, good charge-discharge cycle characteristics, and improve the effect of supply.

Inactive Publication Date: 2013-04-10
SUBARU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

worst case can cause fire

Method used

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Examples

Experimental program
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Effect test

Embodiment 1）

[0059] (1) Production of positive electrode

[0060] The following materials are used for the positive electrode composite material layer:

[0061] The first active material (Li 3 V 2 (PO 4 ) 3 ): 30 parts by mass

[0062] The second active material (LiNi 0.8 co 0.1 mn 0.1 o 2 ): 60 parts by mass

[0063] Binder (polyvinylidene fluoride (PVdF): 5 parts by mass

[0064] Conductive material (carbon black): 5 parts by mass

[0065] Solvent (N-methyl-2-pyrrolidone (NMP)): 100 parts by mass

[0066] Mix to obtain positive electrode slurry. The positive electrode slurry was applied on a positive electrode current collector of aluminum foil (thickness: 30 μm) and dried to form a positive electrode composite material layer on the positive electrode current collector. The coating amount (per side) of the positive electrode composite material layer is 14mg / cm 2 . The uncoated part of 10×10 mm was reserved as the tab for lead wire connection, and the coated part (the part ...

Embodiment 2）

[0080] Changed the coating amount (per side) of the negative electrode composite material layer to 10.6mg / cm 2 , so that the initial charge capacity of the negative electrode per unit area is set to x[mAh / cm 2 ], set the initial charge capacity of the positive electrode per unit area as y[mAh / cm 2 ], except that the relationship between x and y was y / x=0.6, all the conditions were the same as in Example 1, and batteries were produced and evaluated. The capacity retention rate was 87%. In the pinning safety test, the battery did not experience abnormal heating or fire.

Embodiment 3）

[0082] Changed the coating amount (per side) of the negative electrode composite material layer to 7.6mg / cm 2 , so that the initial charge capacity of the negative electrode per unit area is set to x[mAh / cm 2 ], set the initial charge capacity of the positive electrode per unit area as y[mAh / cm 2 ], except that the relationship between x and y was y / x=0.85, all the conditions were the same as in Example 1, and a battery was produced and evaluated. The capacity retention rate was 91%. In the pinning safety test, the battery did not experience abnormal heating or fire.

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Abstract

In a non-aqueous electrolyte secondary battery, a positive electrode active material includes a carbon-coated lithium vanadium phosphate and a lithium nickel composite oxide. A negative electrode active material includes a carbon-based active material capable of intercalating and deintercalating lithium ions. When a first charge capacity of a negative electrode per unit area is x (mAh / cm 2 ), and a first charge capacity of a positive electrode per unit area is y (mAh / cm 2 ), a relation of x and y satisfies 0.6 y / x 0.92.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, in particular, to a nonaqueous electrolyte secondary battery containing lithium vanadium phosphate and lithium nickel composite oxide as positive electrode active materials. Background technique [0002] In recent years, non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries have been used as power sources for electrical equipment and the like, and are also increasingly used as power sources for electric vehicles (EVs, HEVs, etc.). In addition, for non-aqueous electrolyte secondary batteries such as lithium-ion secondary batteries, it is desired to achieve further improvement in characteristics, such as improved energy density (higher capacity), higher output density (higher output), or improved cycle characteristics (improved cycle life) , high security, etc. [0003] At present, most lithium-ion secondary batteries used in small electrical equip...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58H01M4/48H01M4/583H01M10/0525
CPCH01M4/364H01M4/525H01M4/5825H01M10/0525H01M2010/4292H01M2220/20Y02E60/10Y02T10/70
Inventor 柳田英雄泷本一树
Owner SUBARU CORP
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