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Method for preparing cathode active material and non-aqueous electrolyte

A technology of cathode active material and non-aqueous electrolyte, which is applied in the field of preparation of non-aqueous electrolyte batteries, can solve the problems of reduced proportion, low conductivity and reduced battery capacity, etc.

Inactive Publication Date: 2002-04-24
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, LiFePO 4 The conductivity is low, so if the LiFePO 4 As a cathode active material, a large amount of conductive material needs to be added to the cathode active material
Since the particle size of the conductive material is larger than that of LiFePO 4 particle size, the LiFePO in the cathode active material 4 The proportion of the reduction, as a result, the capacity of the battery becomes smaller

Method used

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  • Method for preparing cathode active material and non-aqueous electrolyte
  • Method for preparing cathode active material and non-aqueous electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] Preparation of cathode active material

[0106] Li 3 PO 4 and Fe 3 (PO 4 ) 2 .8H 2 O was mixed together so that the elemental ratio of lithium to iron was 1:1, and acetylene black powder was added as an amorphous carbon material to the obtained mixture in an amount of 10% by weight of the entire sintered product. The resulting mixture and aluminum balls with a diameter of 10 mm were put into an aluminum can with a diameter of 100 mm, so that the weight ratio between the mixture and the aluminum balls was equal to 1:2. The mixture was ground with a planetary ball mill. As for the planetary ball mill, one manufactured by ITO SEISAKUSHO KK under the trade name LA-PO was used 4 A planetary rotary jar mill was used for the test, and the mixture was ground under the following conditions.

[0107] The specific grinding of the planetary ball mill is carried out as follows, the sample mixture and each aluminum ball with a diameter of 10mm are packed into an aluminum tank...

Embodiment 2

[0123] The cathode active material was prepared in the same manner as in Example 1, except that the second grinding time, that is, the driving time of the planetary ball mill was set to 60 minutes, to prepare a coin-shaped test battery.

Embodiment 3

[0125] The cathode active material was prepared by the same method as in Example 1, except that the second grinding time was set, that is, the driving time of the planetary ball mill was 120 minutes, and a coin-shaped test battery was prepared.

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Abstract

An non-aqueous electrolyte cell having superior electronic conductivity and superior cell characteristics. A cathode active material used for the cell is a composite material of a compound having the formula LixFePO4, where 0 H01M 4 / 48 H01M 4 / 58 H01M 10 / 40 2 21 24 2001 / 9 / 29 1346162 2002 / 4 / 24 1180497 2004 / 12 / 15 2004 / 12 / 15 2004 / 12 / 15 Sony Corp. Japan Hosotani Mori Takahashi Kimio Fukushima Yuzuru long chuangong 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2000 / 9 / 29 301400 / 2000

Description

field of invention [0001] The invention relates to a preparation method of a cathode active material, which can be reversibly doped / non-doped with lithium, and a preparation method of a non-aqueous electrolyte battery using the cathode active material. Background technique [0002] Currently, to accommodate the rapid development of electronic devices, rechargeable secondary batteries are being studied as convenient and economically available long-life power sources. Representative of these secondary batteries are lead storage batteries, alkaline storage batteries and nonaqueous electrolyte secondary batteries. [0003] Among the foregoing secondary batteries, a lithium ion secondary battery as a nonaqueous electrolyte secondary battery has advantages such as high output and high energy density. Lithium-ion secondary batteries consist of a cathode and an anode, each of which has an active material capable of reversibly doping / undoping at least lithium ions and a non-aqueous ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05C01B31/02H01M4/02H01M4/136H01M4/36H01M4/58H01M4/62H01M10/052H01M10/0525H01M10/0565H01M10/0566H01M10/44
CPCH01M4/5825H01M2004/028H01M4/625H01M4/366H01M4/136H01M10/0565H01M10/0525H01M10/44Y02E60/122C01P2002/82C01P2004/61C01P2004/62C01P2006/12C01P2006/40C01B25/45Y02E60/10H01M4/48H01M4/583
Inventor 细谷守高桥公雄福嶋弦
Owner MURATA MFG CO LTD
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