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High-voltage electrolyte of lithium ion battery and application thereof

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of poor cycle performance and capacity loss of lithium-ion batteries, and achieve the purpose of protecting the crystal structure, reducing the loss of reversible capacity, and improving stability and safety. Effect

Pending Publication Date: 2021-01-26
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the capacity of lithium-ion batteries is rapidly lost under high temperature and high pressure, and the cycle performance is poor, which cannot meet the working needs of lithium-ion batteries under high temperature and high pressure.

Method used

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  • High-voltage electrolyte of lithium ion battery and application thereof
  • High-voltage electrolyte of lithium ion battery and application thereof
  • High-voltage electrolyte of lithium ion battery and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a lithium-ion half-cell, which is prepared through the following steps.

[0029] 1.0mol of LiPF 6 Dissolve in a mixed solution of ethylene carbonate (EC) / dimethyl carbonate (DMC) with a volume ratio of 1:1 (0.5 L in volume) to form a blank electrolyte, and then add a mass ratio of 0.1 wt% of diethyl phenyl phosphite (DEPP) is used as an additive, that is, diethyl phenyl phosphite accounts for 0.1% of the total weight of the electrolyte. Assembled into LiCoO 2 / Li half cell.

Embodiment 2

[0040] 1.0mol of LiPF 6 Dissolve in a mixed solution of ethylene carbonate (EC) / dimethyl carbonate (DMC) with a volume ratio of 1:1 (0.5 L in volume) to form a blank electrolyte, and then add a mass ratio of 0.5 wt% of diethyl phenyl phosphite is used as an additive, that is, diethyl phenyl phosphite accounts for 0.5% of the total weight of the electrolyte. Assembled into LiCoO 2 / Li half cell.

Embodiment 3

[0042] 1.0mol of LiPF 6 Dissolve in a mixed solution of ethylene carbonate (EC) / dimethyl carbonate (DMC) with a volume ratio of 1:1 (0.5 L in volume) to form a blank electrolyte, and then add a mass ratio of 1 wt% of diethyl phenyl phosphite is used as an additive, that is, diethyl phenyl phosphite accounts for 1% of the total weight of the electrolyte. Assembled into LiCoO 2 / Li half cell.

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PUM

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Abstract

The invention provides a high-voltage electrolyte of a lithium ion battery and application thereof. The electrolyte comprises a non-aqueous organic solvent, a lithium salt and a functional additive, the mass fraction of the functional additive in the electrolyte is less than 5%, the mass fraction of the non-aqueous organic solvent in the electrolyte is 60%-90%, and the mass fraction of the lithiumsalt in the electrolyte is 10%-20%. The electrolyte disclosed by the invention can form a stable CEI oxidation film on the surface of a positive electrode, so that the electrolyte is prevented from continuously generating a redox reaction on the surface of the positive electrode; and meanwhile, the oxide film can effectively avoid continuous contact between the electrolyte and the positive electrode material, so that the crystal structure of the electrode material is protected, the loss of reversible capacity in the circulation process is effectively reduced, and the stability and safety of the battery are improved.

Description

technical field [0001] The invention relates to an electrolyte, in particular to a high-voltage-resistant lithium-ion battery electrolyte, which belongs to the technical field of lithium-ion batteries. Background technique [0002] Due to the advantages of high energy density, high working voltage, long cycle life, high power, and environmental friendliness, lithium-ion batteries have become a research hotspot in the field of new energy. Automobiles have expanded to large-scale energy storage, military industry, aerospace and other fields. With the rapid development of lithium-ion batteries and the need for large-capacity lithium-ion batteries for electric vehicles, it is urgent to develop lithium-ion batteries with high safety, high capacity, high power, long life and environmental protection. [0003] As an important part of the battery, the electrolyte plays the role of transporting lithium ions between the positive and negative electrodes of the lithium-ion battery, kno...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 任玉荣苗春霞朱威凯
Owner CHANGZHOU UNIV