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Electrolyte, preparation method thereof, and application thereof

An electrolyte and electrolyte additive technology, which is applied in the field of lithium batteries, can solve the problems of battery gas production and cycle performance deterioration, and achieve the effects of improving surface stability, reducing gas production, improving high temperature performance and cycle life

Active Publication Date: 2019-04-19
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In view of this, the present invention aims to propose an electrolyte to solve the problem of H in the battery. 2 High concentration of O and HF leads to the problem of battery gas production and poor cycle performance

Method used

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  • Electrolyte, preparation method thereof, and application thereof
  • Electrolyte, preparation method thereof, and application thereof
  • Electrolyte, preparation method thereof, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] (1) Inject a part of the main electrolyte (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) (accounting for 75% of the total battery weight) into the battery (the positive pole of the battery is NCM ternary (LiNi 0.8 co 0.1 mn 0.1 o 2 ) material, the negative electrode adopts pure graphite respectively) and charge and form at 0.05C to generate a solid electrolyte interface film on the negative electrode surface of the battery;

[0058] (2) Another part of the electrode solution body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) and the electrolyte additive (compound shown in formula 1, X is -CH 2 , the amount added is 0.5wt% of the weight of the electrolyte) into the battery.

Embodiment 2

[0060] (1) Inject a part of the electrolyte body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) (accounting for 80% of the total battery weight) into the battery (the positive pole of the battery is NCM ternary (LiNi 0.8 co 0.1 mn 0.1 o 2 ) material), the negative electrode adopts graphite doped with 10wt% Si) and charges and forms it at 0.15C to generate a solid electrolyte interface film on the surface of the negative electrode of the battery;

[0061] (2) Another part of the electrode solution body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) and the electrolyte additive (compound shown in formula 1, X is -C 2 h 4 , the amount added is 0.01wt% of the weight of the electrolyte) into the battery.

Embodiment 3

[0063] (1) Inject a part of the main electrolyte (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) (accounting for 85% of the total battery weight) into the battery (the positive pole of the battery is NCM ternary (LiNi 8 co 1 mn 1 o 2 ) material, the negative electrode adopts Si material) and then charge and form at 0.25C to generate a solid electrolyte interface film on the surface of the negative electrode of the battery;

[0064] (2) Another part of the electrode solution body (1.0M LiPF6, EC / EMC / DMC=2 / 3 / 5) and the electrolyte additive (compound shown in formula 1, X is -C 3 h 6 , the amount added is 1wt% of the weight of the electrolyte) into the battery.

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Abstract

The invention discloses an electrolyte, a preparation method thereof and an application thereof. The electrolyte comprises an electrolyte main body and an electrolyte additive, wherein the electrolyteadditive includes compounds shown in the formula I (as shown in the description), wherein X is alkyl. Therefore, by mixing the electrolyte additive having an imidazolone functional group and a silanefunctional group with the electrolyte main body, wherein the silane group on the electrolyte additive can absorb a highly electronegative fluorinion F<-> or a hydroxide ion OH<->, and at the same time, the oxygen in the imidazolone functional group can absorb a PF5 ionic group, thereby inhibiting the hydrofluoric acid HF and moisture H2O content in the electrolyte, reducing the erosion of the electrode material by the HF and inhibiting dissolution of the transition metal and damage of the electrolyte, thereby improving the stability of the surface of the positive electrode material, reducingthe gas production amount of a battery containing the fluorine additive electrolyte, thereby improving the high temperature performance and cycle life of the lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to an electrolyte and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density and good cycle performance, and are widely used in electric vehicles, energy storage, digital and other fields, especially in the field of electric vehicles, which have higher requirements for battery energy density and safety. The current lithium-ion battery materials for electric vehicles are mainly ternary (LiNi x co y mn 1-x-y o 2 ) and lithium iron phosphate (LiFePO 4 ), its safety performance and comprehensive performance are good, but the current technical level cannot improve the energy density of lithium iron phosphate materials, and the increase of nickel content in ternary materials can improve the specific capacity of the material. It is well known that the positive electrode uses high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 苏树发路宇帅
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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