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Electrolyte of considering high temperature cycle performance and low temperature cycle performance of battery and lithium-ion battery

A high-low temperature cycle, lithium-ion battery technology, applied in the direction of battery electrodes, secondary batteries, circuits, etc., can solve the problems of conductivity, cycle and high temperature performance, and can not optimize the function of battery materials, etc., to broaden the use temperature range, Good cycle performance and enhanced competitiveness

Inactive Publication Date: 2016-07-20
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional lithium battery electrolytes have average conductivity, cycle and high temperature performance. When higher requirements are placed on the high and low temperature performance of battery products, conventional electrolyte materials cannot optimize the function of battery materials

Method used

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  • Electrolyte of considering high temperature cycle performance and low temperature cycle performance of battery and lithium-ion battery
  • Electrolyte of considering high temperature cycle performance and low temperature cycle performance of battery and lithium-ion battery

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Embodiment 1

[0019] (1) Electrolyte preparation: according to EC (ethylene carbonate): PC (propylene carbonate): DEC (diethyl carbonate): EMC (methyl ethyl carbonate): VC (vinylene carbonate): PS ( Propylene sulfite) = 35:5:35:25:2:2.5 volume ratio, prepare the electrolyte solution with lithium salt concentration of 1mol / L, wherein EC, PC, DEC and EMC are non-aqueous solvents, VC and PS are Additive, lithium salt is the composition of following structural formula:

[0020] .

[0021] (2) Preparation of cathode material: LiFePO mixed with 91% by weight 4 (positive active material), 4% by weight of SP (superconducting carbon black) and 5% by weight of PVDF (binder), and adding N-methylpyrrolidone to it to make a slurry, the The slurry is coated on an aluminum foil, and rolled after drying to obtain the positive electrode material.

[0022] (3) Preparation of negative electrode material: mixing 75% by weight of artificial graphite, 20% by weight of mesophase carbon microspheres, and 5% b...

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Abstract

The invention discloses a nonaqueous electrolyte, for a lithium-ion battery, of considering the high temperature cycle performance and the low temperature cycle performance of the battery and the lithium-ion battery employing the electrolyte. The electrolyte comprises a nonaqueous solvent, an additive and a lithium salt as shown in a general formula shown in the specification, wherein R1 and R2 are one of halogen elements; and the additive is one or more of vinylene carbonate, propylene sulfite, methylene methanedisulfonate and vinylethylene carbonate. By changing the lithium salt in the electrolyte for the lithium-ion battery and adding a certain amount of film-forming additive, the impedance of the battery in the cyclic process is reduced; and the stability of the electrolyte in a high temperature cycle and a low temperature cycle is improved, so that the high temperature cycle performance and the low temperature cycle performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolytes, and in particular relates to a non-aqueous electrolyte for lithium-ion batteries capable of taking into account both high-temperature cycle performance and low-temperature cycle performance, and a lithium-ion battery using the electrolyte. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high working voltage, small size, light weight, high energy density, no memory effect, no pollution, small self-discharge, and long cycle life. In 1990, Sony Corporation of Japan produced the first lithium-ion battery, setting off a wave of commercialization of lithium-ion batteries. In recent years, in addition to being used in consumer electronics, lithium-ion secondary batteries are also widely used in electric vehicles, and are regarded as an important means to solve vehicle exhaust pollution and reduce fossil en...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/58H01M10/0525H01M10/0567
CPCH01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/0567Y02E60/10
Inventor 卫友亮沈中宇
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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