The quality for lithium ion batteries of cathode active material, the anode for lithium ion batteries, and a lithium ion battery

Title:

The quality for lithium ion batteries of cathode active material, the anode for lithium ion batteries, and a lithium ion battery

Document Type and Number:

Japanese Patent JP5934089

Kind Code:

B2

Abstract:

The present invention provides a positive electrode active material for lithium ion battery which attains a lithium ion battery having high safety. The positive electrode active material for lithium ion battery has a layer structure represented by the compositional formula: Li x (Ni y M 1-y )O z (wherein M represents Mn and Co, x denotes a number of 0.9 to 1.2, y denotes a number of 0.8 ± 0.025, and z denotes a number of 1.8 to 2.4). When a lithium ion battery using a positive electrode mix produced by the positive electrode active material, a binder, and a conductive material in a ratio by weight of 91%, 4.2%, and 4.8%, respectively, is charged to 4.3V, and then an electrolytic solution prepared by dissolving 1 M-LiPF 6 in a mixture solvent of ethylene carbonate (EC)-dimethyl carbonate (DMC) (volume ratio 1 : 1) is used based on 1.0 mg of the positive electrode mix to measure the obtained lithium ion battery by differential scanning calorimetry (DSC) performed at a temperature rise rate of 5°C/min, a difference T between a first exothermic peak temperature T1 (°C) and a temperature T2 at which an exothermic strength is 1/2 of the first exothermic peak strength (T2 < T1) satisfies the equation: T ¥ 13 (°C).

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Inventors:

Hiroto Sato

Application Number:

JP2012503255A

Publication Date:

June 15, 2016

Filing Date:

March 03, 2011

Export Citation:

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Assignee:

JX Nippon Mining & Metals Co., Ltd.

International Classes:

H01M4/505; H01M4/131; H01M4/525

Domestic Patent References:

JP2005302628A	2005-10-27
JP2005332707A	2005-12-02
JP2002063901A	2002-02-28
JPH08138669A	1996-05-31
JPH11307094A	1999-11-05
JP2004227790A	2004-08-12
JP2002164053A	2002-06-07
JP2006156126A	2006-06-15
JP2008521196A	2008-06-19

Foreign References:

WO2002086993A1

2002-10-31

Other References:

JPN6014055324; 山木準一: 'リチウムイオン電池構成材料の熱安定性' Ｎｅｔｓｕ　ＳｏｋｕｔｅｉＶｏｌ３０，Ｎｏ．１, 20030125, ｐ．３-８

Attorney, Agent or Firm:

Axis International Patent Business Corporation

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