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Lithium primary battery

A battery and electrolyte technology, applied in primary batteries, primary battery electrodes, battery electrodes, etc., can solve the problems of easy decline in discharge characteristics, easy decomposition and decomposition of electrolytes, and achieve the effect of not damaging high-temperature storage characteristics

Inactive Publication Date: 2009-09-02
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, in the method of Patent Document 1, the effect of suppressing the voltage drop at the initial stage of discharge can only be obtained in the low temperature environment.
In addition, after storage at high temperature, the discharge characteristics tend to decrease
This is believed to be due to the use of a material with a higher discharge potential with respect to lithium than graphite fluoride, which makes the electrolyte easy to decompose
Also, in the methods of Patent Documents 2 and 3, the electrolyte is decomposed during storage at high temperature due to the use of a material having a higher discharge potential with respect to lithium than graphite fluoride, and the discharge characteristics may deteriorate.

Method used

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Examples

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Embodiment 1

[0054] As the lithium primary battery of the present invention, it is produced in the following order figure 1 coin-type batteries. figure 1 It is a longitudinal sectional view of a coin-type battery which is an example of the lithium primary battery of the present invention.

[0055] (1) Production of positive electrode

[0056] Using a Micro Speed ​​Mixer (manufactured by Hokoki Co., Ltd.), the weight ratio in the solid component is 100:10:15:6, and the average particle diameter of the positive electrode active material is fluorinated graphite of 15 μm, as LiV with an average particle size of 10 μm as the positive active material 2 o 4 The microparticles (manufactured by High Purity Chemical Laboratory Co., Ltd.), acetylene black as a conductive agent, and SBR as a binder were dry-mixed. As the fluorinated graphite, what fluorinated petroleum coke was used. Then, the water and ethanol mixed solution was added to the mixture, and the mixture was fully kneaded by a Usagaw...

Embodiment 2

[0066] Using the "Mechanofusion System" manufactured by Hosokawa Micron Co., Ltd., the same graphite fluoride and lithium vanadate as in Example 1 were mechanochemically treated at a rotation speed of 2000 rpm for 30 minutes. In this way, a composite material composed of graphite fluoride and lithium vanadate was obtained. Add the same conductive agent and binder as in Example 1 to the composite material, and dry mix them. At this time, the mixing ratio of the materials used in the positive electrode was the same as in Example 1. Then, a mixed solution of water and ethanol was added to the mixture, and the mixture was thoroughly mixed with a Usagawa universal mixer (manufactured by Shinagawa Kogyo Co., Ltd.) to obtain a mixture. This mixture was dried at 100° C., and compression-molded with a predetermined metal mold using a hydraulic press to obtain a positive electrode. Using this positive electrode, a battery was produced in the same manner as in Example 1.

Embodiment 3

[0068] In addition to replacing lithium vanadate and using Li with an average particle size of 10 μm 4 Ti 5 o 12 (LT-1 manufactured by Titanium Industry Co., Ltd.), a battery was produced in the same manner as in Example 1.

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Abstract

This invention provides a lithium primary battery that has excellent large-current discharge properties under low-temperature environment without sacrificing high-temperature storage properties. The lithium primary battery is a lithium primary battery comprising a positive electrode containing a fluoride as a positive electrode active material, a negative electrode containing a lithium metal or lithium alloy as a negative electrode active material, a separator provided between the positive electrode and the negative electrode, and an electrolyte. The positive electrode can occlude and release lithium, has a spinel structure, and contains a metal oxide having a lower discharge potential with respect to lithium than the fluoride.

Description

technical field [0001] The present invention relates to a lithium primary battery using fluoride such as fluorinated graphite as an active material, a positive electrode, a negative electrode, an electrolyte and a diaphragm, and in particular to a lithium primary battery with excellent high-current discharge characteristics at low temperature and high-temperature storage characteristics. Background technique [0002] Lithium primary batteries using graphite fluoride as the positive electrode active material and lithium metal or its alloys as the negative electrode active material have high voltage and high energy density compared to conventional aqueous solution batteries. excellent stability. Therefore, such lithium primary batteries have been used in various applications such as main power sources and backup power sources of small electronic devices. [0003] However, along with the multifunctionalization and miniaturization of electronic equipment, further improvement in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/06H01M4/58H01M6/16H01M4/48H01M4/485H01M4/587
CPCH01M4/505H01M6/166Y02E60/122H01M4/405H01M4/587H01M6/164H01M4/525H01M4/5835H01M4/364H01M4/485H01M4/06
Inventor 人见彻山中晋藤井慎二高田坚一森垣健一
Owner PANASONIC CORP