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Lithium primary battery

A battery and conductive agent technology, applied in the field of lithium primary batteries, can solve the problems of losing the interchangeability of 1.5V primary batteries, achieve the effect of maintaining high-rate discharge characteristics and suppressing the rise of OCV

Inactive Publication Date: 2012-07-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] On the other hand, it is known that when a lithium battery is stored at a high temperature for a long period of time, the OCV increases, and when the OCV increases to about 2V, there is a problem of losing compatibility with other 1.5V-class primary batteries.

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Embodiment Construction

[0022] Before describing the present invention, the reason for conceiving the present invention will be described.

[0023] The inventors of the present application speculate that one of the reasons for the increase in OCV during long-term high-temperature storage is that a small amount of sulfur is dissociated from iron disulfide (equilibrium potential: about 1.8 V) of the positive electrode active material. : about 2.5V) redox reaction (S / S 2- ) showing a high potential.

[0024] From such a point of view, the inventors of the present application think that in order to suppress the increase in OCV, it is only necessary to suppress the dissociation of sulfur from iron disulfide. Large particle size (coarse powder) of iron disulfide can suppress OCV increase.

[0025] Therefore, in order to verify this speculation, single lithium primary batteries using iron disulfide with different particle diameters as the positive electrode active material were produced, and the OCV incre...

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Abstract

Disclosed is a lithium primary battery which comprises a positive electrode (1) that contains iron disulfide as a positive electrode active material. The lithium primary battery is characterized in that: the positive electrode (1) is configured by filling a positive electrode core material, which is composed of a porous metal body, with a positive electrode mixture that contains the positive electrode active material composed of iron disulfide and a conductive agent; the average particle diameter of the iron disulfide is within the range of 20-50 [mu]m; the conductive agent has a specific surface area of not less than 300 m2 / g; and the mixing mass ratio of the iron disulfide to the conductive agent in the positive electrode mixture is within the range from 97 : 3 to 93 : 7.

Description

technical field [0001] The present invention relates to a lithium primary battery using iron disulfide as a positive electrode active material. Background technique [0002] Iron disulfide is used in a lithium primary battery (hereinafter referred to as "lithium primary battery") as a positive electrode active material. Since the iron disulfide of the positive electrode active material is about 894mAh / g, and the lithium of the negative electrode active material is about 3863mAh / g , is composed of positive and negative electrode materials with very high theoretical capacity, so it has high practical value as a high-capacity and light-weight battery. In addition, since the initial open circuit voltage (OCV; Open circuit voltage) of this lithium primary battery is 1.7 to 1.8V, and the average discharge voltage is around 1.5V, it is different from other 1.5V primary batteries, such as manganese batteries, alkaline manganese batteries, oxide batteries, etc. Silver batteries, air...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/06H01M4/58H01M4/62H01M4/74
CPCY02E60/12H01M4/06H01M6/14H01M2004/028H01M4/661H01M4/625H01M4/808H01M4/745H01M4/5815
Inventor 加藤文生布目润福原佳树清水敏之
Owner PANASONIC CORP