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Electrolyte and lithium ion battery

An electrolyte and electrolyte additive technology, applied in the battery field, can solve the problems of poor battery cycle performance and storage performance, etc.

Pending Publication Date: 2021-04-30
SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, increasing the working voltage will make the cycle performance and storage performance of the battery poor

Method used

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  • Electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042]The preparation steps of the lithium ion battery of the present embodiment are as follows:

[0043](1) Electrolytic solution is prepared: mix the lithium salt, organic solvent, and additive to obtain a lithium ion battery electrolyte, wherein the concentration of the lithium salt is 1.2 mol / L, the lithium salt is lithium hexafluorophosphate; the organic solvent is vinyl carbonate, two carbonate Ethyl ester and methyl carbonate, wherein the mass ratio of ethylene carbonate, diethyl carbonate and methyl carbonate is 4: 3: 3; additives are composed of the following components: fluorocarbonate 1%, sulfate 2% of esters, 1% of sulfate, 0.5% lithium difluoro phosphate, 1% of fluorosulfonic acid 1% and three (trimethylsilane) phosphate phosphate 0.5%.

[0044](2) Positive electrode preparation: Positive active material Lini0.6CO0.1Mn0.2O2(Lithium nickel cobalt manganese) and conductive agent acetylene black (SuperP) mixed in a stirring tank, then add N-methylpyrrolidone (NMP) and binder p...

Embodiment 2

[0048]The preparation step of the lithium ion battery of the present embodiment is the same as the preparation step of the lithium ion battery of Example 1, the voltage window of the battery test is different.

Embodiment 3

[0050]The preparation step of the lithium ion battery of the present embodiment is the same as the preparation step of the lithium ion battery of Example 1, the voltage window of the battery test is different.

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Abstract

The invention relates to an electrolyte and a lithium ion battery, and belongs to the technical field of batteries. The electrolyte comprises a lithium salt, an organic solvent and an electrolyte additive, wherein the electrolyte additive comprises lithium difluorophosphate and lithium fluorosulfonate. The lithium fluorosulfonate can form films on the positive electrode and the negative electrode, so that catalytic oxidation of electrolyte on the surface of the positive electrode is effectively avoided, interface side reaction of the electrolyte and the positive electrode under high voltage is inhibited, increase of interface impedance is reduced, and the cycle life of the battery under high voltage is remarkably prolonged;q the lithium difluorophosphate can inhibit growth of a possible negative electrode SEI film in high-voltage circulation and high-temperature storage processes, and can prevent oxidation and reduction reactions of an electrolyte solution, so that increase of interface impedance of a positive electrode and a negative electrode under high voltage is reduced, and therefore, increase of impedance of the positive electrode and the negative electrode can be effectively inhibited through cooperation of the lithium difluorophosphate and the electrolyte solution; and the capacity retention ratio of the battery in the cycle and high-temperature storage process under high voltage can be obviously improved, so that the cycle performance and the storage performance of the battery under high voltage are improved.

Description

Technical field[0001]The present invention relates to the field of battery technology, and more particularly to an electrolyte and a lithium ion battery.Background technique[0002]Lithium-ion batteries are characterized by high cycle life, high ratio of energy, no memory, fast, small size, light weight, etc., widely used in portable electronic equipment, pure electric and hybrid electric vehicles. However, with the development of society, the consumer market has put forward higher requirements for the battery capacity of lithium-ion batteries, and the useful life, and endurance, so that the working voltage has become the main development direction of the next generation of power batteries. However, increasing the working voltage will make the battery's cycle performance and storage performance.Inventive content[0003]Based on this, it is necessary to provide an electrolyte that enables battery to have better cycle performance and storage performance in a high voltage state.[0004]In ad...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 田小东褚春波张耀
Owner SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
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