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Secondary battery and anode active substance

A positive active material, secondary battery technology, applied in the direction of active material electrodes, secondary battery manufacturing, battery electrodes, etc., can solve the problems of reduced utilization efficiency, reduced capacity, etc., and achieve the effect of good capacity, not easy to peel or defect

Inactive Publication Date: 2009-03-04
EVONIK DEGUSSA CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, since there is an interface between the particles of each metal oxide powder, it becomes a resistance under high load, which lowers the utilization efficiency and lowers the capacity.

Method used

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  • Secondary battery and anode active substance
  • Secondary battery and anode active substance
  • Secondary battery and anode active substance

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Embodiment Construction

[0033] Hereinafter, in the present embodiment, a Li secondary battery will be described as the secondary battery. In the present embodiment, lithium manganese oxide, lithium nickel oxide, lithium cobalt oxide, manganese oxide, and the like can be used as the metal oxide constituting the main body of the positive electrode active material.

[0034]As a coating conductive agent (first conductive agent) that covers the surface of each particle of the metal oxide and makes the conductivity of electrons uniform in the metal oxide, a specific surface area of ​​250m can be used. 2 / g~1500m 2 / g Ketjen black or acetylene black, etc. Also, in order to increase the capacity more, it is more preferable that the specific surface area is 1000m 2 / g~1500m 2 / g (refer to Japanese Patent Application Publication No. 9-92265 Figure 4 ).

[0035] In addition, as an additional conductive agent (second conductive agent) further added to the covered metal oxide, it intervenes between the part...

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Abstract

The invention provides an active material of the anode of a secondary battery, which has good capacity in both low load and high load; the active material of the anode is composed of multiple particles of a metal oxide which forms the body of the active material, a first conductive agent which covers the surfaces of all the particles of the metal oxide, and a second conductive agent which is between the particles of the metal oxide and the specific surface area thereof is less than the first conductive agent.

Description

technical field [0001] The invention relates to a secondary battery and its positive electrode active material. Background technique [0002] Conventionally, various metal oxides have been used as the positive electrode active material of the secondary battery, but in most cases, because the electronic conductivity of the metal oxide itself is low, carbon powder is added to the metal oxide. constituted conductive agent. By adding a conductive agent, electron conductivity is imparted between each metal oxide to promote reduction reaction. [0003] Here, as one of factors affecting battery performance, the mixed state of the metal oxide and the conductive agent becomes a problem. That is, how the metal oxide powder and the carbon material fine powder are brought into contact uniformly at high frequency. If these contact strengths are lowered, a portion where electrons cannot be sufficiently transferred to the positive electrode active material occurs, and as a result, an ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/62H01M4/02H01M10/04
CPCY02E60/10Y02P70/50
Inventor 请求不公开姓名
Owner EVONIK DEGUSSA CHINA
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