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Lithium-ion battery electrolyte containing fluoroethylene carbonate and lithium-ion battery

A technology for substituting ethylene carbonate and lithium-ion batteries. It is applied in the field of lithium-ion batteries. It can solve the problems of lithium salt precipitation, reduced cycle capacity, and large internal resistance of batteries, and achieve the goals of reducing decomposition, suppressing high-temperature gas production, and improving discharge capacity. Effect

Inactive Publication Date: 2015-11-25
DONGUAN KAIXIN BATTERY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding a relatively high content of aliphatic nitrile compounds to the electrolyte system can easily lead to the precipitation of lithium salts, and at the same time, there are problems of high internal resistance and low cycle capacity of the battery.

Method used

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  • Lithium-ion battery electrolyte containing fluoroethylene carbonate and lithium-ion battery
  • Lithium-ion battery electrolyte containing fluoroethylene carbonate and lithium-ion battery
  • Lithium-ion battery electrolyte containing fluoroethylene carbonate and lithium-ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In a glove box filled with argon, ethylene carbonate, diethyl carbonate and ethyl methyl carbonate were mixed according to the mass ratio of EC:DEC:EMC=1:1:1, and 3wt% based on the total mass of the electrolyte were added successively. Fluoroethylene carbonate, 1wt% p-methoxybenzonitrile, 2wt% ethoxypentafluorocyclotriphosphazene, 0.2wt% vinylene carbonate, 3wt% 1,3-propane sultone and 1wt% % lithium bis(fluorosulfonyl)imide; finally, slowly add lithium hexafluorophosphate accounting for 12.5wt% of the total mass of the electrolyte to the mixed solution, and stir evenly to obtain the lithium-ion battery electrolyte of Example 1.

Embodiment 2

[0029] In a glove box filled with argon, ethylene carbonate, diethyl carbonate and ethyl methyl carbonate were mixed according to the mass ratio of EC:DEC:EMC=3:6:1, and 2wt% based on the total mass of the electrolyte were added successively. Fluoroethylene carbonate, 0.5wt% benzonitrile, 2wt% ethoxypentafluorocyclotriphosphazene, 0.2wt% vinylene carbonate, 0.5wt% methylene disulfonate and 0.5wt% bis( Lithium fluorosulfonyl)imide; finally, slowly add lithium hexafluorophosphate accounting for 13wt% of the total mass of the electrolyte to the mixed solution, and stir evenly to obtain the lithium-ion battery electrolyte of Example 2.

Embodiment 3

[0031] In a glove box filled with argon, ethylene carbonate, diethyl carbonate and propylene carbonate were mixed in a mass ratio of EC:DEC:PC=3:6:1, and 5wt% based on the total mass of the electrolyte was added successively. Fluoroethylene carbonate, 1wt% phenylacetonitrile, 0.5wt% tri-n-propylphosphonic acid cyclic anhydride, 1wt% vinyl sulfate and 1wt% 1,2-bis(2-cyanoethoxy)ethane; Lithium hexafluorophosphate, accounting for 15 wt% of the total mass of the electrolyte, was slowly added into the solution, and stirred evenly to obtain the lithium ion battery electrolyte of Example 3.

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Abstract

The invention discloses a lithium-ion battery electrolyte containing fluoroethylene carbonate. The lithium-ion battery electrolyte comprises a non-aqueous solvent, a lithium salt and an additive. The lithium-ion battery electrolyte is characterized in that the additive comprises fluoroethylene carbonate, a cyanophenyl compound and a cyclic phosphorus compound. The used cyclic phosphorus compound can be subjected to ring-opening polymerization on a positive surface at high voltage of over 4.35V; a protective film with good oxidative resistance and lithium ion permeability is formed on the positive surface; decomposition of the electrolyte at high potential is reduced; the cathode material structure is stabilized; internal resistance increase of the battery in the cycle process can be effectively suppressed; the discharge capacity of the battery is improved; the cycle performance is improved; meanwhile, the protective film formed by the cyclic phosphorus compound has god heat stability; and high-temperature gas production caused by the fluoroethylene carbonate in a high-temperature condition can be effectively suppressed.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion battery electrolyte containing fluoroethylene carbonate and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, large specific energy, environmental protection and no memory effect, and are widely used in digital, military, energy storage and power fields. As a key component of lithium-ion batteries, non-aqueous electrolyte plays the role of transporting lithium ions in lithium-ion batteries and is a bridge connecting the positive and negative electrode materials of lithium-ion batteries. [0003] With the continuous maturity of the production process of coated high-voltage lithium cobalt oxide, layered nickel-cobalt lithium manganese oxide and spinel lithium nickel manganese oxide, the development of 4.35V~5.0V high-voltage electrolyte in the industry is also increasing. more attention. Among them, f...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 仰永军吕家斌胡巍万华平
Owner DONGUAN KAIXIN BATTERY MATERIAL
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