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An electrolyte and power lithium battery for high-power start-stop batteries

An electrolyte and high-power technology, which is applied in the field of electrolyte, can solve the problems of not being able to effectively meet the requirements of the operating temperature range of the start-stop battery, etc., and achieve the effects of reducing the growth rate, improving the poor high-temperature storage capacity, and reducing the eutectic point

Active Publication Date: 2021-06-15
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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Abstract

An electrolytic solution for a high-power start-stop battery, the electrolytic solution comprising 100 parts by weight includes the following components by weight: 14-20 parts of lithium salt, 70-85 parts of organic solvent and functional additives 1-10 parts; the organic solvent is composed of the following components, each component accounts for 12-20 parts of ethylene carbonate EC, 5-11 parts of propylene carbonate PC, ethyl methyl carbonate EMC 10‑20 parts, Propyl Acetate PA 14‑22 parts and Propyl Propionate PP 12‑20 parts. The lithium-ion battery electrolyte of the present invention can effectively reduce the conductivity of the electrolyte at low temperature, improve the impedance of the interface film at low temperature, and then improve the charge and discharge power characteristics at low temperature, and further improve the high-temperature stability of the lithium salt and the interface film, reducing the The high-temperature side reaction of the electrolyte 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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Patent Type & Authority Patents(China)
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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