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Cathode material of lithium ion battery, and preparation method

A lithium-ion battery and negative electrode material technology, applied in the field of negative electrode materials, can solve the problems of irreversible loss of initial capacity, large energy loss, and failure to meet actual needs.

Inactive Publication Date: 2006-02-01
沈阳大学师范学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Research and practice have shown that carbon materials have defects such as large energy loss and poor high-rate charge and discharge performance.
Carbon negative electrode is easy to form passivation film (SEI) in organic electrolyte, which will cause irreversible loss of initial capacity, and the electrode potential of carbon material is similar to metal lithium. When the battery is overcharged, metal lithium is easy to precipitate on the surface of carbon electrode, forming dendrites. Crystal causes short circuit
The electrochemical capacity of carbon materials is low, and its theoretical capacity is only 327mAh / g, which cannot meet the actual needs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: Preparation of antimony and lead composite oxide and its electrical properties

[0011] Take 0.05molSbCl 3 Crystal, dissolved in 100ml absolute ethanol, take 0.05molPb(NO 3 ) 2 Dissolve in 100ml distilled water. Under stirring, add the above two equal volumes of solution to excess concentrated ammonia water dropwise at the same speed at the same time, heat to reflux, filter while hot, wash the filter cake repeatedly with distilled water until neutral, and dry the filter cake at 120 ° C for 48 hours to obtain SbPbO 2.5 powder. The powder is made into an electrode sheet according to a conventional method, and a pure metal lithium sheet is used as a counter electrode, and its electrical performance test is carried out in an automatic charge-discharge instrument. The simulated battery current density is 0.1C / g, the charge cut-off voltage is 1.5V, and the discharge cut-off The voltage is 0V. The results showed that the composite had a discharge capacity of 1...

Embodiment 2

[0012] Example 2: Preparation of antimony and germanium composite oxide and its electrical properties

[0013] Take 0.05molSbCl respectively 3 and GeCl 4 , were dissolved in 100ml of absolute ethanol, and the above-mentioned equal-volume solution was added dropwise to excess concentrated ammonia water at a constant speed under stirring, heated to reflux, filtered while hot, and the filter cake was washed repeatedly with distilled water until neutral, and the filter cake was Dry at 120°C for 48 hours to obtain SbGeO 3.5 powder. The powder is made into an electrode sheet according to a conventional method, and a pure metal lithium sheet is used as a counter electrode, and its electrical performance test is carried out in an automatic charge-discharge instrument. The simulated battery current density is 0.1C / g, the charge cut-off voltage is 1.5V, and the discharge cut-off Voltage 0V. The results show that the first discharge capacity of the composite oxide is 1050mAh / g, the f...

Embodiment 3

[0014] Embodiment three: the preparation of antimony, ferroalloy and its electric property

[0015] Put the porcelain boat filled with antimony and iron composite oxides into the constant temperature zone of the electric heating reduction furnace, pass in pure hydrogen gas, remove the air in the furnace, close the system, heat when the pressure reaches a certain value, and let the hydrogen gas Circulating in a closed system, constant temperature reduction at 400 ° C, when the pressure no longer drops, the reaction is terminated, cooled to room temperature, and SbFe and Sb are obtained 2 Fe dual-phase alloy. The obtained alloy is made into an electrode sheet according to a conventional method, and a pure metal lithium sheet is used as a counter electrode, and its electrical performance test is carried out in an automatic charging and discharging instrument. The simulated battery current density is 0.1C / g, and the charging cut-off voltage is 1.5V. The cut-off voltage is 0V. Th...

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PUM

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Abstract

The invention solves technical issues existed in carbon cathode material: larger energy loss; poor charging and discharging performance in high scale factor; easy of forming passive film co cause irreversible loss in initial capacity; when overcharge, because of near potential between carbon and lithium, it is easy to separate out lithium on surface of carbon pole to form dendritic crystal to cause short circuit possibly; low electrochemical capacity of carbon material, theoretical capacity as 327mAh / g. main points of the invention are: as main body, stibiumis combined with metals such as iron, lead, tin and germanium form stibiumis based composite oxides, stibiumis based alloys or stibiumis based metal compound powder to be as cathode material. Advantages are: high electrochemical capacities of the said stibiumis based composite oxides, stibiumis based alloys or stibiumis based metal compound powder, and good charging and discharging performance in high scale factor. The disclosed material meets actual need.

Description

technical field [0001] The invention relates to a negative electrode material of a lithium ion battery and a preparation method of the material. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, good safety performance, light weight, small self-discharge, long cycle life, no memory effect, and no pollution. In recent years, graphite and carbon materials are mostly used as anode materials for lithium-ion batteries. Research and practice have shown that carbon materials have defects such as large energy loss and poor high-rate charge and discharge performance. Carbon negative electrode is easy to form passivation film (SEI) in organic electrolyte, which will cause irreversible loss of initial capacity, and the electrode potential of carbon material is similar to metal lithium. When the battery is overcharged, metal lithium is easy to precipitate on the surface of carbon electrode, forming dendrites. The crystal caus...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/58H01M4/04C01G1/02C01G30/00
CPCY02E60/122H01M10/0525H01M4/38H01M4/485Y02E60/10
Inventor 吕成学
Owner 沈阳大学师范学院
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