Method for producing cathode active material and method for manufacturing nonaqueous electrolyte cell

A cathode active material and non-aqueous electrolyte technology, which can be used in non-aqueous electrolyte batteries, electrode manufacturing, and final product manufacturing to solve problems such as battery performance degradation

Inactive Publication Date: 2005-02-16
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, when using manganese oxide or lithium manganese oxide as the cathode active material of a non-aqueous electrolyte secondary battery, battery performance deteriorates undesirably with charge-discharge cycles

Method used

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  • Method for producing cathode active material and method for manufacturing nonaqueous electrolyte cell
  • Method for producing cathode active material and method for manufacturing nonaqueous electrolyte cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Initially, the synthesis replaced LiMn with Cr 2 o 4 The Cr-substituted spinel lithium manganese oxide obtained from part of the Mn is used as the cathode active material.

[0055] Commercially available manganese dioxide (MnO 2 ) powder, lithium carbonate (Li 2 CO 3 ) powder and chromium oxide (Cr 2 o 3 ) powders were mixed together, and Li, Cr and Mn were mixed in a mixing ratio of 1:0.2:1.8.

[0056] The resulting mixed powder was sintered in an electric furnace under atmospheric pressure, thereby synthesizing Cr-substituted spinel-type lithium manganese oxide. The sintering temperature at this time was set to 800°C. When analyzing a sample obtained by sintering the mixed powder by X-ray diffraction, the spectrum corresponds exactly to that of LiMn as described in ISDD card 35-782 2 o 4 The data.

[0057] Then, the Cr-substituted spinel-type lithium manganese oxide is used as the cathode active material, graphite is used as the conductive material, and poly...

Embodiment 2- Embodiment 4， comparative example 1 and comparative example 3

[0062] A coin cell was produced in the same manner as in Example 1, however, the sintering temperature of the sintered mixed powder was set to the temperature shown in Table 1 below.

Embodiment 5- Embodiment 8

[0063] Embodiment 5-embodiment 8, comparative example 3 and comparative example 4

[0064] Initially, the synthesis replaced LiMn with Co 2 o 4 The Co-substituted spinel lithium manganese oxide obtained from part of the Mn is used as the cathode active material.

[0065] Commercially available manganese dioxide (MnO 2 ) powder, lithium carbonate (Li 2 CO 3 ) powder and cobalt oxide (Co 3 o 4 ) powders were mixed together, and Li, Co and Mn were mixed in a mixing ratio of 1:0.2:1.8.

[0066] The resulting mixed powder was sintered in an electric furnace under atmospheric pressure, thereby synthesizing Co-substituted spinel-type lithium manganese oxide. The sintering temperature at this time was set to the temperature shown in Table 1 below.

[0067] A coin cell was manufactured in the same manner as in Example 1, but using the Co-substituted spinel-type lithium manganese oxide synthesized above as the cathode active material.

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Abstract

A method for producing a cathode active material which produces a spinel type lithium manganese oxide expressed by a general formula: Li1+xMn2-x-yMeyPO4, as the cathode active material, (here, x is expressed by a relation of 0<=x<=0.15 and y is expressed by a relation of 0 C01D 15 / 02 H01M 4 / 04 1 19 31 2001 / 10 / 23 1350339 2002 / 5 / 22 1189959 2005 / 2 / 16 2005 / 2 / 16 2005 / 2 / 16 Sony Corp. Japan Sakai Hideki Fukuba Shigeshi Takahashi Kimio wang jie 11038 The Patent Agency of the Chinese Council for the Promotion of International Trade (CCPIT) No.1 Waidajie, Fuxingmen, Beijing 100086 Japan 2000 / 10 / 23 323214 / 2000

Description

field of invention [0001] The present invention relates to a method for producing a cathode active material from a spinel-type lithium manganese oxide and a method for manufacturing a nonaqueous electrolyte battery using the cathode active material. Background technique [0002] In recent years, with the rapid development of various electronic devices, research on rechargeable secondary batteries has been actively conducted as batteries that can be used conveniently and economically for a long period of time. As typical secondary batteries, lead-acid storage batteries, alkaline storage batteries, lithium secondary batteries, and the like are known. Among these secondary batteries, lithium secondary batteries in particular have advantages in high output, high energy density, and the like. [0003] A lithium secondary battery includes a cathode using a cathode active material that undergoes a reversible electrochemical reaction with lithium ions, an anode using an anode activ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/05C01G37/00C01G45/00C01G49/00C01G51/00C01G53/00H01M4/505H01M4/525
CPCH01M4/525C01G53/54C01P2002/32H01M10/0525H01M4/505C01P2002/54C01G51/54Y10T29/49108C01G45/1242H01M4/485C01P2006/40C01G37/006C01G49/009Y02E60/122H01M4/04H01M4/133H01M4/134
Inventor 酒井秀树福屿弦高桥公雄细谷守
Owner SONY CORP
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