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Lithium ion battery

A lithium-ion battery and ion technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low battery average voltage, low initial Coulombic efficiency, low battery energy density, etc., and achieve the effect of accurate remaining power

Inactive Publication Date: 2011-09-21
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low specific capacity, low first Coulombic efficiency, low electrode density and low average voltage of the battery, the energy density of the whole battery is low.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0025] The lithium-ion battery was prepared with reference to the method of Comparative Example 1, except that 18.6 grams of hard carbon and 167.4 grams of graphite were used when preparing the negative electrode, that is, the mass percentage of hard carbon in the negative electrode active material was 10%, instead of 186 grams of graphite in the comparative example.

Embodiment 2

[0027] The lithium-ion battery was prepared with reference to the method of Comparative Example 1, except that 55.8 grams of hard carbon and 130.2 grams of graphite were used when preparing the negative electrode, that is, the mass percentage of hard carbon in the negative electrode active material was 30%, replacing 186 grams of graphite in the comparative example.

Embodiment 3

[0029] A lithium-ion battery was prepared with reference to the method of Comparative Example 1, except that 93 grams of hard carbon and 93 grams of graphite were used when preparing the negative electrode, that is, the mass percentage of hard carbon in the negative electrode active material was 50%, replacing 186 grams of graphite in the comparative example.

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Abstract

Provided is a lithium ion battery which comprises an anode, a cathode and isolated film non-water electrolyte solution. The active substance of the anode is a polyanion salt of lithium and transition metal and the active substances of the cathode comprise at least a high graphitization carbon and at least a low graphitization carbon. Because a high energy density of the battery can be maintained through using high graphitization material with carbon element and an inclined voltage platform can be given to the battery at a discharge anaphase through using low graphitization carbon, so the discharging depth of the battery at the discharge anaphase can be more accurately indicated, thereby the shortcoming that it is difficult to indicate the discharging depth of the battery is overcome when the discharge voltage of the battery is flat because in the battery, the polyanion salt of lithium and transition metal are used as the active materials of the anode and the graphite is used as the active material of the cathode.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery capable of accurately indicating the discharge depth of the battery. Background technique [0002] With people's emphasis on environmental issues, the development and use of electric vehicles has gradually attracted people's attention. Electric vehicles use electricity stored in rechargeable batteries to replace fossil fuels, which can reduce or even achieve zero emissions and can significantly improve the environmental situation of cities. Lithium iron phosphate (LiFePO4) cathode material has significant advantages such as abundant raw materials, low price, and good safety, and has become one of the main cathode materials for lithium-ion batteries used in pure electric vehicles and plug-in hybrid vehicles. At present, the negative electrode material of lithium-ion batteries used in pure electric vehicles and plug-in hybrid vehicles is mainly graphite. Such anode...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M10/0525H01M4/58
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 付成华许瑞韩昌隆
Owner DONGGUAN AMPEREX TECH
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