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High-voltage-resistant electrolyte for lithium-rich manganese-based lithium ion battery

A technology of lithium-rich manganese-based lithium and ion batteries, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of electrolyte oxidation reaction, lithium-ion battery capacity attenuation, etc., to reduce interface impedance and suppress capacity reduction , the effect of inhibiting oxidative decomposition

Active Publication Date: 2020-10-30
FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under high voltage conditions, the electrolyte is prone to oxidation reactions, which leads to rapid decline in the capacity of lithium-ion batteries under high voltage conditions.

Method used

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  • High-voltage-resistant electrolyte for lithium-rich manganese-based lithium ion battery
  • High-voltage-resistant electrolyte for lithium-rich manganese-based lithium ion battery
  • High-voltage-resistant electrolyte for lithium-rich manganese-based lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Electrolyte preparation: In an argon-filled glove box (moisture 6 solution, and then add 1.0 wt% ethyl-bis(trimethylsilyl) phosphite, and stir evenly to obtain the lithium-ion battery electrolyte of Example 1.

[0041] Preparation of the positive electrode sheet: fully stir and mix the positive electrode active material lithium-rich material, the conductive agent acetylene black, and the binder polyvinylidene fluoride (PVDF) in the N-methylpyrrolidone system at a mass ratio of 80:10:10, Coated on the positive electrode current collector Al foil, dried and cold pressed to obtain the positive electrode sheet.

[0042] Preparation of isolation membrane: PE porous polymer film is used as isolation membrane.

[0043] Preparation of lithium ion battery: the obtained positive electrode sheet is placed in an oven at a certain temperature to dry it and then moved into a glove box. Then put the processed positive electrode sheet, separator, and lithium sheet in order, pack it in...

Embodiment 2

[0045] Electrolyte preparation: In an argon-filled glove box (moisture 6 solution, then add 0.2wt% dimethyl sulfonyl methane, and stir to obtain the lithium-ion battery electrolyte of Example 2.

[0046] All the other steps are the same as in Example 1.

Embodiment 3

[0048] Electrolyte preparation: In an argon-filled glove box (moisture 6 solution, and then add 1.0wt% ethoxy pentafluorocyclotriphosphazene, and stir evenly to obtain the lithium-ion battery electrolyte of Example 3.

[0049] All the other steps are the same as in Example 1.

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Abstract

The invention provides a high-voltage-resistant electrolyte for a lithium-rich manganese-based lithium ion battery. The high-voltage-resistant electrolyte comprises a non-aqueous organic solvent, a lithium salt and an electrolyte additive, wherein the electrolyte additive is selected from any one or more of an alkyl-bis(trimethylsilyl) phosphite compound, a disulfonyl compound and cyclic fluorophosphazene. According to the invention, the lithium ion battery electrolyte additive can improve the stability of a lithium-rich positive electrode material, the internal resistance of the battery is effectively reduced, the oxidation-reduction reaction of the electrolyte on the surface of the electrode material is inhibited, the prepared electrolyte has more stable properties under high voltage, the cycle performance of the lithium-rich manganese-based lithium ion battery under high voltage conditions is remarkably improved, and the electrolyte can be widely applied to lithium ion batteries.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a high-voltage-resistant electrolyte solution for lithium-rich manganese-based lithium-ion batteries. Background technique [0002] With the promotion of electric vehicles and other equipment, the demand for lithium-ion batteries with high energy density is becoming more and more urgent. Traditional lithium cobalt oxide, lithium manganese oxide, and ternary materials have been unable to meet the energy density requirements of lithium-ion batteries. Li-rich manganese-based materials have attracted much attention due to their advantages of high capacity and low cost. However, there are still many problems with lithium-rich manganese-based materials, the most important of which are poor cycle performance and voltage drop, which have also become important factors that limit the application of lithium-rich manganese-based materials. The main reason for the poor cycle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525Y02E60/10
Inventor 吴茂祥郑香珍王文国黄韬潘荧
Owner FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI
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