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secondary battery

A secondary battery and positive electrode technology, applied in the field of secondary batteries, can solve the problems of high interface resistance and capacity reduction, etc.

Inactive Publication Date: 2015-12-02
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the secondary battery of the above-mentioned related art, since the interface resistance between the electrode active material and the electrolyte material is large, the capacity sometimes drops significantly when charging and discharging at a high rate

Method used

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Embodiment 1

[0069] [Example 1] The preparation of composite particles will be described. Weigh the positive electrode active material LiCoO 2 (manufactured by NiChia Corporation; D 50 =10μm), modified material BaTiO3 (manufactured by KCM Corporation; D 50 =50nm) and electrolyte material Li 1.5 Al 0.5 Ge 1.5 (PO 4 ) 3 (manufactured by Hosokawa Micron Corporation, D 50 = 100nm, LAGP) makes having a weight ratio LiCoO 2 : BaTiO 3 :LAGP=100:0.1:5, and the lamination process was carried out using a mechanical fusion apparatus AMS-MINI manufactured by Hosokawa Micron Corporation. Composite particles were obtained in this way, BaTiO 3 Set on LiCoO 2 / LAGP interface.

[0070] Next, the production of the evaluation battery will be described. First, the composite particles obtained by the above method and LAGP were weighed so as to have a weight ratio of LiCoO 2 :LAGP=100:30 and mixed with a mortar to obtain a positive electrode composite. The resulting positive electrode composite h...

Embodiment 2

[0073] [Example 2] An evaluation battery was manufactured in a similar manner to Example 1, except that in the preparation of composite particles, the weight ratio between the positive electrode active material, modified material, and electrolyte material was LiCoO 2 : BaTiO 3 :LAGP=100:0.5:5. The mixing ratio of the positive electrode composite is LiCoO 2 / BaTiO 3 / LAGP=100 / 0.5 / 30.

Embodiment 3

[0074] [Example 3] An evaluation battery was fabricated in a similar manner to Example 1, except that in the preparation of composite particles, the weight ratio between the positive electrode active material, modified material, and electrolyte material was LiCoO 2 : BaTiO 3 :LAGP=100:1:5. The mixing ratio of the positive electrode composite is LiCoO 2 / BaTiO 3 / LAGP=100 / 1 / 30.

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Abstract

A secondary battery is provided with a positive electrode active material layer a containing a positive electrode active material, a negative electrode active material layer containing a negative electrode active material, an electrolyte layer formed between the positive electrode active material layer and the negative electrode active material layer, and a modification material disposed at an interface between an electrolyte material and at least one electrode active material among the positive electrode active material and the negative electrode active material, and having a higher relative permittivity than the relative permittivity of the electrolyte material.

Description

technical field [0001] The present invention relates to a secondary battery in which interfacial resistance is reduced. Background technique [0002] With the rapid popularity of information-related equipment, communication equipment, etc. such as personal computers, camcorders, and portable phones in recent years, emphasis has been placed on the development of batteries used as their power sources. In addition, in the world automobile industry and the like, the development of high-power and high-capacity batteries for electric vehicles or for hybrid vehicles is also advancing. Currently, among various types of batteries, lithium secondary batteries are attracting attention from the viewpoint of high energy density. [0003] In the field of such lithium secondary batteries, various studies are being conducted to reduce the interfacial resistance between the active material and the electrolyte. For example, Japanese Patent Application Publication No. 2009-193803 (JP-A-2009-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/052H01M4/131H01M4/84H01M4/505H01M4/525H01M10/0562
CPCH01M4/485H01G11/50H01M4/0471H01M4/131H01M4/505H01M4/525H01M4/62H01M10/052H01M10/0562H01M2300/0071Y02E60/122Y02E60/13Y02E60/10
Inventor 矢田千宏井手一人
Owner TOYOTA JIDOSHA KK