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High-voltage lithium ion battery electrolyte and long-cycle-life high-voltage lithium ion battery

A lithium-ion battery, high-voltage technology, applied in the battery field, can solve the problems of capacity decay and poor cycle performance of high-voltage lithium-ion secondary batteries, and achieve the effects of improving kinetic characteristics, improving high and low temperature performance, and enriching chemical composition

Inactive Publication Date: 2021-03-05
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies in the background technology, provide a high-voltage lithium-ion battery electrolyte, and effectively solve the problems of capacity attenuation and poor cycle performance of high-voltage lithium-ion secondary batteries

Method used

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  • High-voltage lithium ion battery electrolyte and long-cycle-life high-voltage lithium ion battery
  • High-voltage lithium ion battery electrolyte and long-cycle-life high-voltage lithium ion battery
  • High-voltage lithium ion battery electrolyte and long-cycle-life high-voltage lithium ion battery

Examples

Experimental program
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Embodiment 1

[0026] Electrolyte preparation:

[0027] In a glove box filled with argon (oxygen content ≤ 1ppm, water content ≤ 1ppm), ethylene carbonate EC, propylene carbonate PC, divinyl carbonate DEC, propyl propionate PP, fluoroethylene carbonate FEC 25:10:20:40:5 volume ratio mix well and keep stirring, add 12.5% ​​LiPF in the mixed solution 6 . Then, compound 1 accounting for 1% of the mass fraction of the battery electrolyte solution, vinylene carbonate VC accounting for 1% of the mass fraction of the battery electrolyte solution, and 1,3-propanesulfonic acid accounting for 1% of the mass fraction of the battery electrolyte solution were added to the mixed solution. The ester PS and the succinonitrile SN accounting for 1% mass fraction of the battery electrolyte solution were stirred to completely dissolve to obtain the electrolyte solution of Example 1.

[0028] Preparation of lithium-ion batteries:

[0029] The positive electrode active material LiNi 0.5 co 0.3 mn 0.2 o 2 ,...

Embodiment 2-12

[0034] In Examples 2-12, except that the electrolyte solvent, additive composition and content are added as shown in Table 1, the others are the same as in Example 1.

[0035] The battery electrolyte composition of table 1 embodiment 1-12

[0036]

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Abstract

The invention belongs to the technical field of batteries, and discloses a high-voltage lithium ion battery electrolyte and a long-cycle-life high-voltage lithium ion battery. The high-voltage lithiumion battery electrolyte comprises a non-aqueous organic solvent, an electrolyte and a film-forming additive, wherein the film-forming additive contains a negative electrode film-forming additive anda phosphorus-containing ester additive with a structure shown in the specification. In the electrolyte, the HOMO energy of the phosphorus-containing ester additive shown in the structural formula 1 ishigher than that of ethylene carbonate, an oxidation reaction is preferentially performed on the surface of a ternary material to form a stable and compact CEI film, and the oxidation reaction of theelectrolyte on the surface of an electrode is reduced; meanwhile, an interface film with relatively small impedance is formed on the surface of the negative electrode, so the dynamic characteristicsinside the battery are improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a high-voltage lithium-ion battery electrolyte and a long-cycle-life high-voltage lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect, and have been widely researched and applied. At present, the application of lithium-ion batteries in the field of electric vehicles and hybrid vehicles has put forward higher requirements for their energy density. The current commercial high-capacity lithium-ion battery cathode materials mainly include lithium cobaltate, lithium manganese oxide, lithium nickel manganese oxide, ternary materials, etc. Among them, increasing the cut-off voltage of the battery is considered to be an effective way to increase the energy density. However, the crystal structure is destroyed under high voltage, and the transition metal ions leave the lattice and ente...

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 杨艳茹朱学全郭力大浦靖王建斌
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD