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Lithium ion secondary battery

A secondary battery and lithium ion technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as deterioration of electrical storage device characteristics, and achieve the effect of preventing cycle characteristics or rate characteristics from decreasing

Inactive Publication Date: 2013-04-03
SUBARU CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, it is known that vanadium is eluted from the positive electrode due to hydrogen ions derived from hydrogen fluoride generated by decomposition of the electrolytic solution after the above-mentioned vanadium-based positive electrode active material is subjected to a high-temperature environment or after a charge-discharge cycle. Causes of deterioration in characteristics of power storage devices

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0062] (1) Production of positive electrode

[0063] The following materials are used for the positive electrode composite material layer:

[0064] Active material (Li 3 V 2 (PO 4 ) 3 ): 90 parts by mass

[0065] Conductive additive (carbon black): 5 parts by mass

[0066] Binder (PVdF): 5 parts by mass

[0067] Solvent (N-methyl-2-rolidone (NMP)): 100 parts by mass

[0068] Mix to obtain positive electrode slurry. The positive electrode slurry was applied on a positive electrode current collector of aluminum foil (30 μm in thickness) and dried to form a positive electrode composite material layer on the positive electrode current collector. The weight per unit area (each side) of the positive electrode composite material layer is 22 mg / cm 2 . Keep the uncoated part of 10×10mm as the lug for lead connection, and cut the coated part (the part where the positive electrode composite material layer is formed) to 50×50mm. In addition, as a result of measurement using a m...

Embodiment 2）

[0086] Add 1 mass part of LiVOPO 4 , except for the vanadium-containing additive B in the material for the negative electrode composition material layer, a battery was produced and evaluated under the same conditions as in Example 1. The capacity maintenance rate was 72%. In addition, the results of the discharge rate characteristic test were substantially the same as those of Example 1.

Embodiment 3）

[0088] Add 1 mass part of Li 3 V 2 (PO 4 ) 3 , except for the vanadium-containing additive C in the material for the negative electrode composition material layer, a battery was fabricated and evaluated under the same conditions as in Example 1. The capacity maintenance rate was 71%. In addition, the results of the discharge rate characteristic test were substantially the same as those of Example 1.

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Abstract

There is provided is a lithium ion secondary battery. The lithium ion secondary battery includes: a positive electrode having a positive electrode active material layer containing a positive electrode active material containing a vanadium-based compound; and a negative electrode having a negative electrode active material layer containing a negative electrode active material into which lithium ions can be inserted / removed reversibly. A vanadium-based compound is dispersed in the negative electrode active material layer. As a result, a vanadium-based compound, corresponding to the vanadium-based compound contained in the positive electrode active material is dispersed in the negative electrode active material layer.

Description

technical field [0001] The present invention relates to a lithium ion secondary battery, in particular, to a [0002] A lithium ion secondary battery in which an active material contains a vanadium compound. Background technique [0003] In recent years, lithium-ion secondary batteries have been used as power sources for electrical equipment, communication equipment, etc., and are also used as power sources for electric vehicles (EVs, HEVs, etc.). In addition, lithium ion secondary batteries are expected to achieve further improvement in characteristics, such as improved energy density (higher capacity), higher output density (higher output), improved cycle characteristics (improved cycle life), and higher safety. [0004] In recent years, vanadium-based positive electrode active materials such as vanadium oxide and vanadium lithium oxide have attracted attention as positive electrode active materials for obtaining high-output and high-capacity lithium ion secondary batteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/136H01M4/131H01M4/62
CPCH01M4/133H01M4/136H01M4/364H01M4/485H01M4/5825H01M4/62H01M10/0525Y02E60/10H01M4/36H01M4/48
Inventor 柳田英雄泷本一树
Owner SUBARU CORP