Electrolyte additive, lithium battery electrolyte and lithium ion battery

An electrolyte additive and electrolyte technology, applied in the field of lithium batteries, can solve the problems of low chemical stability window, reduced cycle performance and safety performance of lithium ion batteries, etc., to widen the working voltage range, improve the electrochemical stability window, and improve stability. sexual effect

Inactive Publication Date: 2018-11-06
桑德新能源技术开发有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improving the working voltage of lithium-ion batteries is an effective way to improve their energy density and rate performance. The working voltage of existing general lithium-ion batteries is 3.5V-4.2V. The main factor that currently limits the working voltage of lithium-ion batteries is T

Method used

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  • Electrolyte additive, lithium battery electrolyte and lithium ion battery
  • Electrolyte additive, lithium battery electrolyte and lithium ion battery
  • Electrolyte additive, lithium battery electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Dissolving bis(2,2,2-trifluoroethyl)carbonate accounting for 1% of the mass percentage of the basic electrolyte as an electrolyte additive in the basic electrolyte, wherein the organic solvent of the basic electrolyte is ethylene carbonate, Propylene carbonate, diethyl carbonate and dimethyl carbonate are a mixture of 1:1:3:3 by mass ratio EC:PC:DEC:DMC, and lithium salt LiPF is added 6 , its molar concentration is 1mol / L, with LiNi 0.8 co 0.1 mn 0.1 o 2As the positive electrode active material, graphite is used as the negative electrode active material. The positive and negative electrode current collectors are made of aluminum foil and copper foil respectively, and the diaphragm is made of ceramic diaphragm. The test battery is assembled into a ternary / graphite button battery. The test temperature is carried out at room temperature.

Embodiment 2

[0044] This example is based on Example 1, the difference is that, as an additive, 3% bis(2,2,2-trifluoroethyl)carbonate is dissolved in the mass ratio of EC :PC:DEC:DMC=1:1:3:3,LiPF 6 In the basic electrolyte with a concentration of 1.2mol / L.

Embodiment 3

[0046] This example is based on Example 1, the difference is that 5% by mass percentage of bis (2,2,2-trifluoroethyl) carbonate as an additive, dissolved in the mass ratio of EC :PC:DEC:DMC=1:1:3:3,LiPF 6 In the basic electrolyte with a concentration of 1.2mol / L.

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PUM

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Abstract

The invention relates to an electrolyte additive, an electrolyte and a lithium battery, and belongs to the technical field of lithium batteries. The electrolyte additive comprises at least one of thecompounds shown in the structural formula I: a formula which is as shown in the specification, wherein R in the structural formula I is one of a fluorine group, a phenyl group, an alkyl group, and analkenyl group, wherein n is an integer of 1 to 5. According to the electrolyte additive, the electrolyte additive is subjected to a decomposition reaction in the electrolyte, and the obtained productgenerates a protective film on the surface of a positive electrode, so that a passivation effect is achieved, dissolution of a metal element in a positive electrode material and the collapse of the positive electrode material structure are inhibited, the electrochemical stability window of the electrolyte is improved, the working voltage range of the electrolyte is widened, and the cycling efficiency of the battery under a high voltage (for example 4.2-5.0V) can be effectively improved.

Description

technical field [0001] The invention relates to an electrolyte additive, a lithium battery electrolyte and a lithium ion battery, belonging to the technical field of lithium batteries. Background technique [0002] Portable electronic devices such as laptops, mobile phones, portable audio, and electric vehicles all require lithium-ion batteries with higher energy density, so that they can be lighter and smaller while having stronger battery life. In order to obtain a lithium-ion battery with high energy density, a method of using a negative electrode material with a large capacity, a method of using a high-potential positive electrode, etc. have been developed. Improving the working voltage of lithium-ion batteries is an effective way to improve their energy density and rate performance. The working voltage of existing general lithium-ion batteries is 3.5V-4.2V. The main factor that currently limits the working voltage of lithium-ion batteries is The electrochemical stabili...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235H01M2220/20H01M2220/30H01M2300/0025Y02E60/10
Inventor 石朝辉苗力孝陈橙
Owner 桑德新能源技术开发有限公司
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