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Lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the direction of battery electrodes, secondary batteries, battery pack components, etc., can solve the problem of large loss in the first charge and discharge efficiency and capacity of lithium-ion batteries, and it is difficult to balance the safety performance and battery life of lithium-ion batteries. Chemical properties and other issues, to achieve the effects of charging and discharging efficiency and capacity, good electrochemical performance, and good safety performance

Inactive Publication Date: 2010-12-22
DONGGUAN AMPEREX TECH
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Problems solved by technology

However, when dimethyl methyl phosphate is used in a negative electrode graphite system, it will undergo a reduction reaction with graphite during the formation and cause the graphite to peel off, resulting in a large loss in the first charge and discharge efficiency and capacity of the lithium-ion battery, which is difficult to balance Safety performance and electrochemical performance of lithium-ion batteries

Method used

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Embodiment

[0037] Preparation of the electrolyte: the electrolyte is lithium hexafluorophosphate (LiPF 6 ) is lithium salt, with the mixture of ethylene carbonate (EC), ethyl methyl carbonate (EMC) and dimethyl carbonate (DMC) as solvent, the weight ratio of EC, EMC, DMC is EC: EMC: DMC=5: 2:3. In addition, 10% by weight of dimethyl methylphosphonate (DMMP) was added into the electrolyte.

[0038] The preparation of negative plate: with hard carbon as negative active material, it accounts for 86% of negative electrode diaphragm gross weight; With styrene-butadiene rubber (SBR) as binding agent, it accounts for 6% of positive electrode diaphragm gross weight; With carbon powder (Super-p) is used as a conductive agent, which accounts for 8% of the total weight of the negative electrode membrane. The above powder was mixed and stirred evenly in deionized water to make negative electrode slurry. The negative electrode slurry was uniformly coated on a copper foil with a thickness of 22 μm ...

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Abstract

The invention discloses a lithium ion battery. The lithium ion battery comprises a positive plate, a negative plate, an isolation membrane arranged between the positive plate and the negative plate and an electrolyte, wherein the positive plate comprises a positive current collector and a positive diaphragm which is attached to the positive current collector and contains a positive active substance; the negative plate comprises a negative current collector and a negative diaphragm which is attached to the negative current collector and contains a negative active substance; an electrolyte solvent contains dimethyl methylphosphonate; and the negative active substance is hard carbon. In the lithium ion battery, a structure that carbon layers of the hard carbon are randomly arranged reduces the destruction of the dimethyl methylphosphonate, and weakens a reduction reaction of the hard carbon and the dimethyl methylphosphonate in the formation process; and the first charge-discharge efficiency and capacity of the lithium ion battery are not reduced substantially due to the addition of the dimethyl methylphosphonate, and the safety of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a lithium ion battery with good safety performance and electrochemical performance. Background technique [0002] With the development of information technology, lithium-ion batteries with high energy density are more and more widely favored. However, there are potential safety hazards in the use of lithium-ion batteries: due to short-circuit, overcharge, high temperature or other improper use, the temperature of lithium-ion batteries can easily rise and cause fires and explosions. [0003] In order to improve the safety performance of lithium-ion batteries, a flame retardant solvent, dimethyl methyl phosphate, can be added to the electrolyte. However, when dimethyl methyl phosphate is used in a negative electrode graphite system, it will undergo a reduction reaction with graphite during the formation and cause the graphite to peel off, resulting in a large loss in the first charge and d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M4/131H01M4/136H01M2/16H01M50/417H01M50/457
CPCY02E60/122Y02E60/10
Inventor 潘香英汪颖韩昌隆付成华许瑞赵丰刚
Owner DONGGUAN AMPEREX TECH
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