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Low-temperature fast-charging electrolyte containing surfactant and application thereof

A surfactant and electrolyte technology, used in circuits, electrical components, secondary batteries, etc., can solve problems such as poor low-temperature performance and fast charging, and achieve the effects of improving cycle performance, reducing low-temperature impedance, and improving wettability.

Active Publication Date: 2022-02-25
HUBEI JINQUAN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the deficiencies in the prior art, the purpose of the present invention is to provide a low-temperature fast-charging lithium-ion battery electrolyte containing a surfactant, to solve the problems of poor low-temperature performance and fast charging of lithium-ion batteries, and to improve the electrolyte’s ability to counteract the electrode sheet. Excellent wetting performance, reducing the internal resistance of the battery, reducing the electrode polarization during charge and discharge, significantly improving the low-temperature discharge capacity retention rate and improving the cycle performance of the battery for rapid charging

Method used

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  • Low-temperature fast-charging electrolyte containing surfactant and application thereof
  • Low-temperature fast-charging electrolyte containing surfactant and application thereof
  • Low-temperature fast-charging electrolyte containing surfactant and application thereof

Examples

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Embodiment 1

[0074] The present embodiment provides a kind of preparation method of electrolyte:

[0075] The electrolyte lithium salt in the electrolyte is lithium hexafluorophosphate LiPF 6 , the concentration is 1.00mol / L, the solvent system is ethylene carbonate: propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 30:5:30:35, the additive vinylene carbonate is 2.0%, vinyl sulfate is 0.5%, tris(trimethylsilyl) phosphate 0.3%, perfluoroalkyl betaine 0.1%.

[0076] Wherein, perfluoroalkyl betaine is the compound shown in formula 2, and preparation method is as follows:

[0077] C 8 f 17 SO 2 OCH 3 (51.4g, 0.10mol), CH 3 NHCH 2 CH 2 N(C 2 h 5 ) 2 (15.6g, 0.12mol), catalyst CH 3 ONa (0.054g, 0.001mol) was placed in a reaction flask under nitrogen protection and reacted at 110°C. The by-product methanol was distilled out during the reaction for 1 hour; the excess diamine compound CH was recovered by vacuum distillation. 3 NHCH 2 CH 2 N(C 2 h 5 ) 2 , to obtain ...

Embodiment 2

[0080] The present embodiment provides a kind of preparation method of electrolyte:

[0081] The electrolyte lithium salt in the electrolyte is lithium hexafluorophosphate LiPF 6 , the concentration is 1.00mol / L, the solvent system is ethylene carbonate: propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 30:5:30:35, the additive vinylene carbonate is 1.5%, vinyl sulfate is 0.5%, tris(trimethylsilyl) phosphate 0.5%, perfluoroalkyl betaine 0.3%.

[0082] Wherein, perfluoroalkyl betaine is the compound shown in formula 2, and preparation method is as follows:

[0083] C 8 f 17 SO 2 OCH 3 (51.4g, 0.10mol), CH 3 NHCH 2 CH 2 N(C 2 h 5 ) 2 (15.6g, 0.12mol), catalyst CH 3 ONa (0.054g, 0.001mol) was placed in a reaction flask, protected by nitrogen, and reacted at 100°C. The by-product methanol was distilled out during the reaction for 1 hour; the excess diamine compound CH was recovered by vacuum distillation. 3 NHCH 2 CH 2 N(C 2 h 5 ) 2 , to obtain th...

Embodiment 3

[0086] The electrolyte lithium salt in the electrolyte is lithium hexafluorophosphate LiPF 6 , the concentration is 1.00mol / L, the solvent system is ethylene carbonate: propylene carbonate: dimethyl carbonate: ethyl methyl carbonate = 30:5:30:35, the additive vinylene carbonate is 3.0%, vinyl sulfate is 0.1%, tris(trimethylsilyl) phosphate 0.2%, perfluoroalkyl betaine 0.5%.

[0087] Wherein, perfluoroalkyl betaine is a compound shown in formula 3, and the preparation method is as follows:

[0088] C 6 f 13 CH 2 CH 2 CO 2 C 2 h 5 (42.0g, 0.10mol), NH 2 CH 2 CH 2 CH 2 N(CH 3 ) 2 (12.2g, 0.12mol), Catalyst C 2 h 5 ONa (0.068g, 0.001mol) was placed in a reaction flask, protected by nitrogen, and reacted at 120°C. The by-product methanol was distilled out during the reaction for 1 hour; the excess diamine compound NH was recovered by distillation under reduced pressure. 2 CH 2 CH 2 CH 2 N(CH 3 ) 2 , to obtain the intermediate product perfluoroalkyl tertiary ami...

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Abstract

The invention provides a lithium ion battery electrolyte which comprises a surfactant and a film-forming additive, and the surfactant is perfluoroalkyl betaine; and the film-forming additive comprises vinylene carbonate. The problems of poor low-temperature performance and rapid charging of the lithium ion battery are solved, the surfactant is introduced to improve the infiltration performance of the electrolyte on a pole piece, the internal resistance of the battery is reduced, the electrode polarization of the battery in the charging and discharging process is reduced, the low-temperature discharge capacity retention rate is remarkably improved, and the cycle performance of rapid charging of the battery is improved.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, relates to lithium-ion battery electrolytes and applications thereof, in particular to a low-temperature fast-charging lithium-ion battery electrolyte containing surfactants and applications thereof. Background technique [0002] As the consumption of fossil energy continues to accelerate on the earth, efficient, safe, clean and renewable new energy and related technologies have become research hotspots around the world. Lithium-ion batteries have the advantages of high energy density, high discharge voltage, and long cycle life, and are widely used in mobile electronic devices, electric vehicles (EV), hybrid electric vehicles (HEV) and other fields. Higher requirements are put forward for the performance of lithium-ion batteries, such as how to improve the low-temperature performance of lithium-ion batteries. [0003] In order to solve the poor low-temperature performance of lithium-ion bat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/0566
CPCH01M10/0567H01M10/0566H01M10/0525Y02E60/10
Inventor 张伟康李迟刘范芬苑丁丁
Owner HUBEI JINQUAN NEW MATERIALS CO LTD
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