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Lithium primary cell

A battery and lithium electrode technology, applied in the field of lithium primary batteries, can solve the problems of discharge efficiency, that is, lower energy density, suppress voltage drop, etc., and achieve the effects of less energy density reduction, improved pulse discharge characteristics, and excellent pulse discharge characteristics

Inactive Publication Date: 2013-04-24
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to convert a benzoquinone derivative that has been reduced by discharge to a benzoquinone derivative that is in an oxidized state before discharge.
Therefore, in the intermittent use of the primary battery, it is difficult to obtain the effect of suppressing the voltage drop when used many times
In addition, benzoquinone derivatives present in non-aqueous electrolytes do not function as positive electrode active materials
Part of the current during discharge is consumed by the reduction reaction of the benzoquinone derivative, so the discharge efficiency, that is, the energy density becomes low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] In Example 1, the first active material capable of storing lithium ions and the second active material capable of storing and releasing lithium ions were used as positive electrode active materials to produce figure 1 A button-type lithium primary battery is shown. As the first active material, graphite fluoride (CF) is used n , as the second active material, polymer X represented by formula (15) as a quinone compound is used. The method for synthesizing the polymer X is described in detail in Patent Document 3 and the like. The molecular weight of the polymer X used was 9783 (value relative to polystyrene standards) in terms of weight average molecular weight, and its degree of polymerization was about 30. In addition, graphite fluoride (CF) n The open circuit potential at DOD0% is 3.15V, and the average discharge potential is 2.55V. The open circuit potential of Polymer X at DOD0% was 3.05V.

[0110]

[0111] [Production of positive electrode]

[0112] Polyme...

Embodiment 2

[0117] In Example 2, the first active material capable of storing lithium ions and the second active material capable of storing and releasing lithium ions were used as the positive electrode active material to produce figure 1 A button-type lithium primary battery is shown. As the first active material, graphite fluoride (CF) is used n , as the second active material, polymer Y represented by formula (16) as a quinone compound is used. Polymer Y is the reduced state of polymer X.

[0118]

[0119] First, polymer X is subjected to reduction treatment. That is, after dissolving polymer X in N-methylpyrrolidone, impregnated in Li 2 CO 3 Reduction treatment is carried out in an aqueous solution of , thereby obtaining a polymer Y represented by formula (16). Next, weigh 15 mg of polymer Y, graphite fluoride (CF) n 15 mg and 80 mg of acetylene black as a conductive additive were put into a mortar and kneaded. Furthermore, 20 mg of polytetrafluoroethylene was added as a bi...

Embodiment 3

[0122] In Example 3, the first active material capable of storing lithium ions and the second active material capable of storing and releasing lithium ions were used as positive electrode active materials to produce figure 1 A coin-type lithium primary battery is shown. As the first active material, graphite fluoride (CF) is used n , as the second active material, a polymer represented by formula (17) that is a tetraketone compound is used. In formula (17), the ratio of m and n representing the number of repeating units is 50:50. The weight average molecular weight of the polymer of formula (17) was 49840 in terms of polystyrene, and the degree of polymerization was 112. The synthesis method of the polymer of formula (17) is described in detail in, for example, International Publication No. 2011 / 111401. Except that the second active material was different, the button-type lithium primary battery of Example 3 was obtained by the same method as that of Example 1. The open ci...

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Abstract

This lithium primary cell has a positive electrode comprising a first active substance capable of absorbing lithium ions and a second active substance capable of absorbing and releasing lithium ions. The second active substance is spontaneously charged by the first active substance while the lithium primary cell is in open-circuit state. The first active substance is, for example, graphite fluoride or manganese dioxide. The second active substance is, for example, an organic compound having two or more intramolecular ketone groups. The second active substance can also be a polymer.

Description

technical field [0001] The present invention relates to lithium primary batteries. Background technique [0002] Lithium primary batteries have high energy density, excellent reliability such as storage stability, and can be reduced in size and weight. Therefore, the demand for lithium primary batteries is increasing year by year as a main power source for various electronic devices and as a backup power source for memories. In recent years, the use of lithium primary batteries in the field of vehicles is expected to be developed, represented by スマトキ一 (registered trademark). Based on such a background, it is required to improve the output characteristics, especially the pulse (intermittent) discharge characteristics which are instantaneous large current characteristics, while maintaining the high energy density characteristic of lithium primary batteries. [0003] As one of lithium primary batteries, a graphite fluoride lithium battery using graphite fluoride as a positive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M6/16H01M4/06H01M4/60
CPCY02E60/12H01M4/505H01M4/602Y02E60/122H01M4/50H01M4/60H01M4/502H01M6/16H01M4/606H01M4/5835H01M4/587H01M4/364
Inventor 大冢友北条伸彦
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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