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Difunctional additive, electrolyte containing additive and lithium-ion battery

A technology of lithium-ion batteries and additives, applied in the direction of non-aqueous electrolyte batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve the problems of normal temperature cycle, low-temperature discharge and high-temperature storage performance, etc., to reduce the dissolution of transition metal ions, Effects of inhibition of reaction, improvement of cycle performance and high and low temperature performance

Active Publication Date: 2019-05-10
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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  • Difunctional additive, electrolyte containing additive and lithium-ion battery
  • Difunctional additive, electrolyte containing additive and lithium-ion battery
  • Difunctional additive, electrolyte containing additive 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 well, 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 difunctional additive, an electrolyte containing the additive and a lithium-ion battery. The difunctional additive is 1,1-diethoxy-1-silicon heterocyclic penta-3-alkene and can participate in positive / negative film formation, improve interface compatibility between the electrolyte and a positive / negative pole and lower HF content of the electrolyte. The lithium-ion batteryelectrolyte, obtained through combined use of the difunctional additive, fluoroethylene carbonate and diphenyl sulfonyl methane, can effectively improve constant-temperature circulation performance of the lithium-ion battery with high energy density and relieve capacity attenuation of the lithium-ion battery, and meanwhile the high-temperature storage performance and the low-temperature performance of the lithium-ion battery can be further improved.

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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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
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