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Electrolyte for high-power start-stop battery and power lithium battery

An electrolyte and high-power technology, applied in the field of electrolytes, can solve the problems of neglecting one another and failing to effectively meet the requirements of the operating temperature range of start-stop batteries, and achieves the advantages of reducing growth rate, improving high-temperature storage and high-temperature cycle performance, and reducing membrane impedance. Effect

Active Publication Date: 2019-05-03
FENGFAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional power electrolytes tend to be overwhelmed and cannot effectively meet the operating temperature range requirements of the start-stop battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The organic solvent used in the electrolyte used in high-power start-stop lithium batteries consists of the following components by weight (accounting for the total electrolyte weight): 15 parts of ethylene carbonate EC, 8 parts of propylene carbonate PC, carbonic acid 13 parts of ethyl methyl ester EMC, 22 parts of propyl acetate PA, 20 parts of propyl propionate PP.

[0021] The functional additive is composed of the following components by weight (accounting for the total electrolyte weight), 0.5 parts of vinylene carbonate VC, 1.2 parts of propylene sulfite PS, 0.5 parts of vinyl sulfate DTD, lithium difluorophosphate LiPO 2 f 2 0.5 parts, lithium bistrifluoromethanesulfonylimide LiTFSI 0.5 parts, lithium difluorobisoxalate phosphate LiDFBOP 0.3 parts, beta-sulfopropionic anhydride SPA 0.5 parts.

[0022] The lithium salt contained in the electrolyte is composed of the following components in parts by weight (accounting for parts by weight of the total electrolyte...

Embodiment 2

[0026] The organic solvent used in the electrolyte used in high-power start-stop lithium batteries consists of the following components by weight (accounting for the total electrolyte weight): 17 parts of ethylene carbonate EC, 5 parts of propylene carbonate PC, carbonic acid 16 parts of ethyl methyl ester EMC, 20 parts of propyl acetate PA, 18 parts of propyl propionate PP.

[0027] The functional additive is composed of the following components by weight (accounting for the total electrolyte weight), 1 part of vinylene carbonate VC, 1.5 parts of propylene sulfite PS, 0.7 parts of vinyl sulfate DTD, lithium difluorophosphate LiPO 2 f 2 0.6 parts, lithium bistrifluoromethanesulfonylimide LiTFSI 0.6 parts, lithium difluorobisoxalate phosphate LiDFBOP 0.4 parts, beta-sulfopropionic anhydride SPA 0.6 parts.

[0028] The lithium salt contained in the electrolyte is composed of the following components in parts by weight (accounting for parts by weight of the total electrolyte), ...

Embodiment 3

[0032] The organic solvent used in the electrolyte used in high-power start-stop lithium batteries consists of the following components by weight (accounting for the total electrolyte weight): 20 parts of ethylene carbonate EC, 7 parts of propylene carbonate PC, carbonic acid 14 parts of ethyl methyl ester EMC, 16.5 parts of propyl acetate PA, 16 parts of propyl propionate PP.

[0033] The functional additive is composed of the following components by weight (accounting for the total electrolyte weight), 1 part of vinylene carbonate VC, 1.5 parts of propylene sulfite PS, 1 part of vinyl sulfate DTD, lithium difluorophosphate LiPO 2 f 2 1 part, 1 part of lithium bistrifluoromethanesulfonylimide LiTFSI, 1 part of lithium difluorobisoxalate phosphate LiDFBOP, 1 part of beta-sulfopropionic anhydride SPA.

[0034] The lithium salt contained in the electrolyte is composed of the following components in parts by weight (accounting for parts by weight of the total electrolyte), lith...

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PUM

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Abstract

An electrolyte for a high-power start-stop battery comprises the following components, per 100 parts by weight, 14 to 20 parts of lithium salt, 70 to 85 parts of organic solvent, and 1 to 10 parts offunctional additives. The organic solvent comprises the following components, by weight accounting for the total weight of the electrolyte: 12 to 20 parts of ethylene carbonate EC, 5 to 11 parts of propylene carbonate PC, 10 to 20 parts of ethyl methyl carbonate EMC, 14 to 22 parts of propyl acetate PA, and 12 to 20 parts of propyl propionate PP. The lithium ion battery electrolyte of the invention can be reduced in electrical conductivity under a low-temperature condition, and improved in the low-temperature interface membrane impedance so as to be improved in the charging and discharging power characteristic at low temperature, further improves the high-temperature stability of the lithium salt and the interface membrane, is reduced in high-temperature side reaction, and improves the high-temperature storage and high-temperature cycle performance of the battery.

Description

technical field [0001] The invention relates to an electrolyte used for a high-power start-stop battery. The electrolyte is applied to a power lithium-ion battery and belongs to the technical field of lithium-ion batteries. Background technique [0002] With the gradual reduction of national new energy vehicle subsidies and the gradual implementation of the double credit policy, the country has proposed a fuel consumption target of 5L / 100km for cars in 2020. Obviously, it is basically impossible to achieve the emission target by simply improving the fuel efficiency of the engine. tasks, and the hybridization and pure electricization of automobiles are the best technical routes. Although electrification is the ultimate goal of automobiles, due to high costs and battery life issues, it cannot be widely popularized in the short term. Compared with the high-voltage hybrid system, the cost of the 48V mild hybrid system is lower, but it can achieve most of the energy-saving effec...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569H01M10/0568H01M10/0525H01M10/42
CPCY02E60/10
Inventor 石琛国海鹏韩小勇刘双合田丽顾志华杨淑娟
Owner FENGFAN
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