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High-voltage electrolyte and lithium ion battery

A lithium-ion battery and electrolyte technology, which is applied in the field of lithium-ion batteries, can solve problems such as unsatisfactory comprehensive effects, and achieve effects suitable for industrialization promotion and application, improving composition, and inhibiting growth

Pending Publication Date: 2022-05-13
HAIKE GRP RES INST OF INNOVATION & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still the problem that most of the time, only one aspect of positive electrode film formation or negative electrode film formation is effective, and the overall effect is still unsatisfactory.

Method used

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  • High-voltage electrolyte and lithium ion battery
  • High-voltage electrolyte and lithium ion battery
  • High-voltage electrolyte and lithium ion battery

Examples

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Effect test

preparation example Construction

[0075] Preparation of film-forming additives:

[0076] Under the condition of nitrogen protection, the whole reaction system was added dichloromethane, triethylamine, and triphenylsilylamine into a three-necked flask with a constant pressure dropping funnel at -30C° and kept stirring for 1 to 3 hours. . The methylene chloride solution of 2-(trifluoromethoxy)benzenesulfonyl chloride was slowly added under stirring, and the reaction was continued at low temperature for 12 hours. After the reaction, use NaHCO 3 The saturated solution was extracted three times, the organic layers were combined, and washed with anhydrous Na 2 SO 4 Dry, filter, and rotary evaporate under reduced pressure to obtain the prepared silamide ligand. Then the n-butyllithium solution was slowly added at -80°C, and the reaction was continued for 4-8 hours under low temperature, anhydrous and oxygen-free conditions. After the reaction is completed, the temperature is slowly returned to room temperature t...

Embodiment 1

[0079] Mix EC (ethylene carbonate): DMC (dimethyl carbonate): EMC (ethyl methyl carbonate) in a ratio of 4:2:4 in a glove box with water content and oxygen content less than 0.1 ppm. Add a certain mass of LiPF to the mixed solution while keeping the temperature outside the reaction vessel below 5°C 6 (Lithium hexafluorophosphate) after stirring continuously until a solution of 1mol / L is evenly prepared, then add 5% (based on the quality of the non-aqueous organic solvent and electrolyte lithium salt as 100%) lithium sulfonyl sulfonyl (structure as follows) and 3 % of 1,3,5-pentanetricarbonitrile and 2% of FEC (fluoroethylene carbonate), and uniformly stirred to obtain the electrolyte solution.

[0080]

[0081] The electrolyte solution prepared in Example 1 of the present invention was tested for performance, see Example 7.

Embodiment 2

[0083] Mix EC (ethylene carbonate): DMC (dimethyl carbonate): EMC (ethyl methyl carbonate) in a ratio of 4:2:4 in a glove box with water content and oxygen content less than 0.1 ppm. Add a certain mass of LiPF to the mixed solution while keeping the temperature outside the reaction vessel below 5°C 6 (Lithium hexafluorophosphate) is continuously stirred to the solution of uniform preparation 1mol / L, then adds 5% (with the quality of non-aqueous organic solvent and electrolyte lithium salt integrated as 100%) of sulfamoyl lithium (structure is the same as embodiment 1) and 3% of glutaronitrile and 2% of DTD (vinyl sulfate), and uniformly stirred to obtain the electrolyte.

[0084] The electrolyte solution prepared in Example 2 of the present invention was tested for performance, see Example 7.

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Abstract

The invention provides an electrolyte for a lithium ion battery. The electrolyte comprises a non-aqueous organic solvent, an electrolyte lithium salt and a multifunctional additive, the multifunctional additive comprises a silicon sulfamoyl lithium salt, a positive and negative pole protective agent and an additive. The silicon sulfamoyl lithium salt in the electrolyte has proper LUMO energy level and HOMO energy level and can form films on the surfaces of positive and negative electrode materials, the film structure is stable, the interfacial compatibility of the positive and negative electrodes is improved, and the high-voltage performance and the cycle performance of the battery are improved; the anode and cathode protection additive is a nitrile substance containing a plurality of cyano groups, can capture metal ions separated out from the ternary anode material under high voltage to form a complex to prevent the metal ions from entering an electrolyte to form metal dendrites on the cathode, and can also form a strong bond with the cathode to improve the components of an SEI film and enhance the toughness and conductivity of the SEI film; and the interface stability of the negative electrode is improved. Moreover, the electrolyte is simple in preparation method, controllable in process and more suitable for industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and relates to an electrolyte solution for lithium-ion batteries and a lithium-ion battery, in particular to a high-voltage electrolyte solution and a lithium-ion battery. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Batteries generally use materials containing lithium elements as electrodes, which are representatives of modern high-performance batteries. Lithium-ion batteries usually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/42
CPCH01M10/0567H01M10/058H01M10/0525H01M10/4235Y02P70/50Y02E60/10
Inventor 鞠署元姜鹏王庆伟刘超陈凯迪
Owner HAIKE GRP RES INST OF INNOVATION & TECH
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