A high-voltage long-cycle additive for lithium ion battery, non-aqueous electrolyte for lithium ion battery containing the additive and application thereof

A lithium-ion battery and non-aqueous electrolyte technology, which is applied in the field of lithium-ion battery non-aqueous electrolyte, can solve the problems of storage performance and safety performance degradation, easy decomposition, etc., and achieve the purpose of inhibiting catalytic oxidation decomposition, inhibiting oxidation reaction, and good The effect of cycle stability

Active Publication Date: 2019-01-15
HENAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a high-voltage long-cycle additive for lithium-ion batteries and a non-aqueous electrolyte for lithium-ion batteries containing the additive. The non-aqueous electrolyte for lithium-ion batteries is used in lithium-ion batteries to effectively solve the problem of The battery is easily decomposed under high-voltage charging and discharging conditions, which leads to the degradation of battery cycle performance, storage performance and safety performance

Method used

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  • A high-voltage long-cycle additive for lithium ion battery, non-aqueous electrolyte for lithium ion battery containing the additive and application thereof
  • A high-voltage long-cycle additive for lithium ion battery, non-aqueous electrolyte for lithium ion battery containing the additive and application thereof
  • A high-voltage long-cycle additive for lithium ion battery, non-aqueous electrolyte for lithium ion battery containing the additive and application thereof

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Effect test

Embodiment 1

[0024] The lithium-ion battery non-aqueous electrolyte of the present embodiment is made up of organic solvent, lithium salt compound and lithium-ion battery high-voltage long-cycle additive (that is, phosphorus-containing double-bond compound); the mass fraction of phosphorus-containing double-bond compound in the electrolyte is 3%, the concentration of lithium salt compound is 0.8mol / L, and the organic solvent is a mixed solvent of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate, wherein ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate The mass ratio is 3:3:4; the lithium salt compound is lithium hexafluorophosphate; the phosphorus-containing double bond compound is

[0025] tris(trimethylsilyl)methyl-[tris(trimethylsilyl)methylphosphanylidene]phosphan.

[0026] The preparation method of the lithium-ion battery non-aqueous electrolyte of the present embodiment comprises the following steps:

[0027] 1) Get ethylene carbonate, ethyl methyl ...

Embodiment 2

[0035] The lithium-ion battery non-aqueous electrolyte of the present embodiment is made up of organic solvent, lithium salt compound and lithium-ion battery high-voltage long-cycle additive (that is, phosphorus-containing double-bond compound); the mass fraction of phosphorus-containing double-bond compound in the electrolyte is 3%, the concentration of lithium salt compound is 1.5mol / L, and the organic solvent is a mixed solvent of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate, wherein ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate The mass ratio is 3:3:4; the lithium salt compound is lithium hexafluorophosphate; the phosphorus-containing double bond compound is

[0036] tris(trimethylsilyl)methyl-[tris(trimethylsilyl)methylphosphanylidene]phosphan.

[0037] The preparation method of the lithium-ion battery non-aqueous electrolyte of the present embodiment comprises the following steps:

[0038] 1) Get ethylene carbonate, ethyl methyl ...

Embodiment 3

[0042] The lithium-ion battery non-aqueous electrolyte of the present embodiment is made up of organic solvent, lithium salt compound, lithium-ion battery high-voltage long-cycle additive (i.e. phosphorus-containing double bond compound) and the second type of additive; phosphorus-containing double bond in the electrolyte Compounds account for 3% of the total mass of the electrolyte, the mass fraction of the second additive is 1%, the concentration of the lithium salt compound is 0.8mol / L, and the organic solvent is ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate. Mixed solvent, wherein the mass ratio of ethylene carbonate, ethyl methyl carbonate and dimethyl carbonate is 3:3:4; the lithium salt compound is lithium hexafluorophosphate; the phosphorus-containing double bond compound is

[0043] tris(trimethylsilyl)methyl-[tris(trimethylsilyl)methylphosphanylidene]phosphan; the second type of additive is tris(trimethylsiloxy)borate.

[0044] The preparation met...

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Abstract

The invention discloses a high-voltage long-cycle additive for lithium ion batteries, a non-aqueous electrolyte for lithium ion batteries containing the additive and an application thereof, belongingto the technical field of lithium ion batteries. The technical scheme of the invention has the following main points: A lithium ion battery high-voltage long-cycle additive the additive is a phosphorus-containing double bond compound, Its structure is as following formula; The present invention also specifically disclose a non-aqueous electrolyte of a lithium ion battery containing the additive and its application in the preparation of a lithium ion battery. The electrolyte of the invention can improve the interface property of the electrode electrolyte of the lithium ion battery and the stability thereof by adding a phosphorus-containing double bond additive, thereby improving the cycle stability of the lithium ion battery under high voltage; The high-voltage cathode material containing Ni and Mn can work stably at high voltages above 4.5 V, and the problem of easy decomposition of lithium-ion batteries under high voltage charging and discharging conditions leading to the degradationof battery cycle performance, storage performance and safety performance is solved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a high-voltage long-cycle additive for lithium-ion batteries, a non-aqueous electrolyte solution for lithium-ion batteries containing the additive, and applications. Background technique [0002] Compared with the previous batteries, the currently commercialized lithium-ion secondary batteries have many advantages such as high specific energy, high voltage and long cycle life. It has been widely used in many small equipment fields (such as: mobile phones, watches, etc.). With the vigorous development of lithium-ion batteries, it has begun to be used in the field of electric vehicles and hybrid vehicles. However, with the rapid development of large-scale mobile equipment, more stringent requirements are put forward for the service life, specific capacity and service conditions of lithium-ion batteries. Therefore, it is of great significance to further de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 杨炎革岳红云董红玉尹艳红李向南杨书廷
Owner HENAN NORMAL UNIV
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