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Bifunctional additive, electrolyte containing same, and lithium ion battery

A lithium-ion battery and additive technology, which is applied in the fields of bifunctional additives, electrolytes and lithium-ion batteries, can solve the problems of normal temperature cycle, low temperature discharge and high temperature storage performance, etc.

Active Publication Date: 2021-09-10
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the normal temperature cycle, low temperature discharge and high temperature storage performance of the high energy density lithium ion battery in the prior art cannot be taken into account, the present invention provides a bifunctional additive, an electrolyte containing the bifunctional additive, and a lithium ion battery

Method used

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  • Bifunctional additive, electrolyte containing same, and lithium ion battery
  • Bifunctional additive, electrolyte containing same, and lithium ion battery
  • Bifunctional additive, electrolyte containing same, and lithium ion battery

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Embodiment approach

[0054] According to some embodiments of the present invention, the preparation method of the lithium-ion battery electrolyte includes the following steps:

[0055] S1: Add the electrolyte lithium salt into the purified organic solvent, stir to completely dissolve the lithium salt, and obtain a lithium salt solution;

[0056] S2: adding bifunctional additives, positive electrode film-forming additives and negative electrode film-forming additives to the above lithium salt solution, stirring, and standing to obtain a lithium-ion battery electrolyte.

[0057] Wherein, the purification of the organic solvent refers to the operation of removing impurities and water of the organic solvent, preferably through molecular sieve and activated carbon. Described molecular sieve can adopt type, type or type.

[0058] Preferably, the dissolution temperature of the electrolyte lithium salt in the organic solvent is 10-20°C.

[0059] Preferably, the standing time is 24-36h.

[0060] T...

Embodiment 1

[0072] Ethyl methyl carbonate (EMC), ethylene carbonate (EC), diethyl carbonate (DEC) are purified, in the glove box that moisture is less than 10ppm, at 15 ℃, organic solvent is according to mass fraction EMC:EC:DEC= 7:5:3 mix evenly, add electrolyte lithium salt LiPF 6 Prepare a 1mol / L solution, stir and mix well, then add 5% fluoroethylene carbonate, 0.2% bisbenzenesulfonylmethane and 0.5% 1, 1-diethoxy-1-silacyclopent-3-ene, stirred and mixed evenly, and left to stand for 24 hours to prepare lithium-ion battery electrolyte.

Embodiment 2

[0074] Lithium-ion battery electrolyte: based on the sum of the mass of organic solvent and lithium salt as 100%, the addition of bisbenzenesulfonylmethane is 0.3%, 1,1-diethoxy-1-silacyclopenta- The addition of 3-ene is 0.5%, and others are identical with embodiment 1.

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Abstract

The invention provides a bifunctional additive, an electrolyte containing it and a lithium ion battery. The bifunctional additive is 1,1-diethoxy-1-silacyclopent-3-ene, which can participate in positive and negative film formation, improve the interface compatibility between the electrolyte and the positive and negative electrodes, and reduce the electrolysis Liquid HF content. The lithium-ion battery electrolyte obtained by combined use with fluoroethylene carbonate and bisbenzenesulfonylmethane can effectively improve the normal temperature cycle performance of high-energy-density lithium-ion batteries, slow down its capacity fading, and further improve the performance of lithium-ion batteries. High temperature storage performance and low temperature performance.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolytes, in particular to a bifunctional additive, an electrolyte containing the same, and a lithium-ion battery. Background technique [0002] During the first charging process of a lithium-ion battery, lithium ions are deintercalated from the lattice of the positive electrode active material, migrate to the negative electrode under the drive of voltage, and are embedded in the negative electrode carbon material. During this process, the electrolyte reacts with the surface of the carbon anode to generate Li 2 CO 3 , Li 2 O, LiOH and other substances, thereby forming a passivation film on the surface of the carbon negative electrode, which is called a solid electrolyte interface (SEI) film. At the same time, the electrolyte reacts with the surface of the positive electrode to form a passivation film that is thinner than the SEI film, called the CEI film. Since lithium ions mus...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/058H01M10/42
CPCY02E60/10Y02P70/50
Inventor 邹志群何凤荣余意
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD