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Positive pole in use for lithium cell, and preparation method

A lithium battery and battery technology, applied in the direction of electrode manufacturing, active material electrodes, etc., can solve the problems of terminating battery life, severe electrochemical polarization, and battery voltage drop, and achieve the effect of expanding the application field and reducing electrochemical polarization

Inactive Publication Date: 2008-11-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited catalytic ability of acetylene black, the electrochemical polarization of this reaction is serious, which makes the battery voltage drop rapidly, and even terminates the battery life in advance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A positive electrode for a lithium battery (lithium thionyl chloride battery), mainly composed of two positive electrode films located on both sides of a nickel material, the positive electrode film is mainly composed of acetylene black, polytetrafluoroethylene and CuCl 2 Prepared from raw materials, the mass percentage of each raw material is: 86.5% acetylene black, 8.5% polytetrafluoroethylene, CuCl 2 5.0%.

[0012] The preparation method of the positive pole of above-mentioned a kind of lithium battery, it comprises the steps:

[0013] 1), ingredients: dissolve 5.0 g of CuCl with 500 ml of ethanol with a mass concentration of 95% 2 , mixed well into a mixed with CuCl 2 The ethanol solution of 8.5g polytetrafluoroethylene is made the polytetrafluoroethylene aqueous emulsion that mass concentration is 60%;

[0014] Measure 86.5g of acetylene black and polytetrafluoroethylene aqueous emulsion and mix uniformly to obtain active substance mixture A; measure and mix CuC...

Embodiment 2

[0025] A positive electrode for a lithium battery (lithium thionyl chloride battery), mainly composed of two positive electrode films located on both sides of a nickel material, the positive electrode film is mainly composed of acetylene black, polytetrafluoroethylene and CuBr 2 Prepared from raw materials, the mass percentage of each raw material is: acetylene black 86.5, polytetrafluoroethylene 8.5, CuBr 2 5.0.

[0026] The preparation method of the positive pole of above-mentioned a kind of lithium battery, it comprises the steps:

[0027] 1), ingredients: dissolving 5.0 g of CuBr with 500 ml of ethanol with a mass concentration of 96% 2 , mix well into a mixture with CuBr 2 The ethanol solution of 8.5g polytetrafluoroethylene is made into the polytetrafluoroethylene aqueous emulsion that mass concentration is 60%, and is standby;

[0028] Measure 86.5g of acetylene black and polytetrafluoroethylene aqueous emulsion and mix uniformly to obtain active substance mixture A;...

Embodiment 3

[0039] A positive electrode for a lithium battery (lithium thionyl chloride battery), mainly composed of two positive electrode films located on both sides of a nickel material, the positive electrode film is mainly composed of acetylene black, polytetrafluoroethylene and CuCl 2 Prepared from raw materials, the mass percentage of each raw material is: acetylene black 84.1, polytetrafluoroethylene 7.8, CuCl 2 8.1.

[0040] The preparation method of the positive electrode of the above lithium battery is the same as in Example 1, and the properties are shown in Table 3.

[0041] table 3

[0042] battery model

After improvement

(discharge system 1)

before improvement

(discharge system 1)

After improvement

(discharge system 2)

before improvement

(discharge system 2)

ER14505

1278mAh

997mAh

2435mAh

2101mAh

[0043] Discharge system 1: 400mA constant current discharge to 2V at 23±2℃.

[0044] Dischar...

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Abstract

The positive electrode of lithium cell includes two pieces of membrane positioned on two faces of nickel material. Characters are that membrane of positive electrode is prepared from raw materials of acetylene black, polytetrafluoroethylene and CuX2 mainly. Mass percent of each material is as: acetylene black 74.8-87.7, polytetrafluoroethylene 8.5-10, and CuX2 3.8-15.2; where X as F, Cl, Br or I. The invention can increase capacity and output power of lithium cell greatly.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a positive electrode for lithium batteries. Background technique [0002] Lithium thionyl chloride batteries, lithium sulfur dioxide batteries and other lithium batteries with active metal lithium as the anode and TAB electrode (the electrode formed by mixing acetylene black and polytetrafluoroethylene in a certain proportion) as the cathode have high single voltage, It has the advantages of stable discharge voltage, wide working temperature range and low self-discharge rate. It is not only widely used in military fields such as radio communication equipment, missile ignition systems, cannon launch equipment, torpedoes, but also in civilian fields such as cardiac pacemakers, electronic watches, and smart instruments. As electronic products tend to be multi-functional and miniaturized, supporting batteries are required to develop in the direction of small si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/04
CPCY02E60/12Y02E60/10
Inventor 王圣平皮振邦吴金平陈艳玲杨问华田熙科周成刚杨超
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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