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Positive electrode active material for secondary cell, positive electrode for secondary cell using same, and secondary cell

A positive active material, secondary battery technology, applied in the direction of active material electrodes, secondary batteries, battery electrodes, etc., can solve problems such as crystal structure deterioration and capacity reduction, and achieve the effect of high working voltage

Inactive Publication Date: 2004-11-10
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] LiCoMnO 4 Iso-spinel compounds also have the problems of capacity reduction with the cycle and deterioration of the crystal structure at high temperatures, and these problems also need to be improved

Method used

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  • Positive electrode active material for secondary cell, positive electrode for secondary cell using same, and secondary cell
  • Positive electrode active material for secondary cell, positive electrode for secondary cell using same, and secondary cell

Examples

Experimental program
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Embodiment 1

[0067] Sample 2 (Example 1) 3.82

Embodiment 2

[0068] Sample 3 (Example 2) 4.00

Embodiment 3

[0069] Sample 4 (Example 3) 4.00

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Abstract

A positive electrode active material for a secondary cell containing a spinel lithium manganese composite oxide expressed by general formula (I) below. Lia(MxMn2-x-y-zYyAz)(O4-wZw) (where 0.5<=x<=1.2, 0<=y, 0<=z, x+y+z<2, 0<=a<=1.2, 0<=w<=1, M includes at least Co and may include, other than Co, at least one selected from the group consisting of Ni, Fe, Cr, and Cu, Y is at least one selected from the group consisting of Li, Be, B, Na, Mg, Al, K, and Ca, A is at least one of Ti and Si, and Z is at least one of F and Cl). When this positive electrode for a secondary cell is used for a positive electrode of a secondary cell, the degradations of reliability such as the degradation of capacity due to cycle and the degradation of the crystal structure due to high temperature can be suppressed, thereby realizing a high operating voltage.

Description

technical field [0001] The present invention relates to a positive electrode active material for a secondary battery containing a spinel-type lithium-manganese composite oxide having a potential of 5 V order and having a large discharge capacity, a positive electrode for a secondary battery using the same, and a secondary battery. Background technique [0002] Lithium-ion secondary batteries are widely used in portable electronic devices, personal computers, and the like. In these applications, miniaturization and weight reduction of batteries have been sought, while improving the energy density of batteries has also become an important technical issue. [0003] Several methods are considered as a method for increasing the energy density of a lithium ion secondary battery, and among them, it is effective to increase the operating potential of the battery. Lithium-ion secondary batteries made of conventional lithium cobalt oxide or lithium manganese oxide as the positive ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/05C01G3/00C01G37/00C01G45/00C01G49/00C01G53/00H01M4/505H01M4/525H01M10/052H01M10/0566
CPCH01M4/505Y02E60/122H01M4/1315H01M4/525H01M10/052Y02E60/10
Inventor 川崎大辅野口健宏沼田达治
Owner NEC CORP
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