12V start-stop lithium ion battery electrolyte

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of reducing the low temperature performance of the battery, unable to guarantee the normal operation of the battery, and increasing the battery resistance.

Active Publication Date: 2021-03-30
CAMEL GRP NEW ENERGY BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To suppress the degradation caused by its decomposition on the surface of the positive and negative electrode materials, improve the high temperature performance of the battery, but at the same time,

Method used

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  • 12V start-stop lithium ion battery electrolyte
  • 12V start-stop lithium ion battery electrolyte
  • 12V start-stop lithium ion battery electrolyte

Examples

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Effect test

Embodiment 1

[0022] A 12V start-stop lithium-ion battery electrolyte, the components include lithium salts, organic solvents, and functional additives. The mass fractions of the components in the lithium salt in the electrolyte are: lithium hexafluorophosphate LiPF6 7.5%, lithium bisfluorosulfonyl imide LiFSI 8.4%. The mass fractions of the components of the organic solvent in the electrolyte are: 13% ethylene carbonate EC, 48% ethyl methyl carbonate EMC and 21% n-2,2,2-trifluoroethyl n-hexanoate TFENH. The mass fractions of functional additives in the electrolyte are: lithium difluorophosphate LiPO2F2 0.6%, vinylene carbonate VC 0.9% and beta-sulfopropionic anhydride SPA 0.6%.

Embodiment 2

[0024] A 12V start-stop lithium-ion battery electrolyte, the components include lithium salts, organic solvents, and functional additives. The mass fractions of the components in the lithium salt in the electrolyte are: lithium hexafluorophosphate LiPF6 8.8%, lithium bisfluorosulfonyl imide LiFSI 9%. The mass fractions of the components of the organic solvent in the electrolyte are: 12.5% ​​ethylene carbonate EC, 47.5% ethyl methyl carbonate EMC and 20% n-hexanoic acid-2,2,2-trifluoroethyl ester TFENH. The mass fractions of functional additives in the electrolyte are: lithium difluorophosphate LiPO2F2 0.7%, vinylene carbonate VC 0.95% and beta-sulfopropionic anhydride SPA 0.55%.

Embodiment 3

[0026] A 12V start-stop lithium-ion battery electrolyte, the components include lithium salts, organic solvents, and functional additives. The mass fractions of the components in the lithium salt in the electrolyte are: lithium hexafluorophosphate LiPF6 7%, lithium bisfluorosulfonimide LiFSI 7.4%. The mass fractions of the components of the organic solvent in the electrolyte were: ethylene carbonate EC 13.5%, ethyl methyl carbonate EMC 49% and n-hexanoic acid-2,2,2-trifluoroethyl ester TFENH 21.5%. The mass fractions of functional additives in the electrolyte are: lithium difluorophosphate LiPO2F2 0.5%, vinylene carbonate VC 0.7% and beta-sulfopropionic anhydride SPA 0.4%.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and discloses a 12V start-stop lithium ion battery electrolyte which comprises the following components in percentage by mass: 14-18% of lithium salt, 80-84% of organic solvent and 1-3% of additive. The lithium salt is lithium hexafluorophosphate and lithium bis (fluorosulfonyl) imide, and the ratio of lithium hexafluorophosphate to lithium bis (fluorosulfonyl) imide is 1: 1-1.2; the organic solvent is ethylene carbonate, ethyl methyl carbonate and n-hexanoate-2, 2, 2-trifluoroethyl, and the ratio of ethylene carbonate to ethyl methyl carbonate to n-hexanoate-2, 2, 2-trifluoroethyl is 1: 3.5-3.8: 1.5-1.7; the functional additive is composed of beta-sulfopropionic anhydride, lithium difluorophosphate and vinylene carbonate in a ratio of 1: 1-1.3: 1.5-1.8. The electrolyte disclosed by the invention has relatively high conductivity and relatively low interface impedance, can realize good pulse discharge performance ofa 12V start-stop battery at a low temperature, is good in operation at a high temperature of 45 DEG C or above, and realizes long-term balance of high and low temperature performances of the battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a 12V start-stop lithium ion battery electrolyte. Background technique [0002] Facing the increasingly serious energy and environmental crisis, the country implements a double credit policy, and puts forward the fuel consumption target of 5L / 100km for automobiles in 2020. Hybridization and pure electrification are the best technical routes. Among them, the development of 48V and 12V mild hybrid power systems is the most economical. [0003] At present, the 48V start-stop system has been used in many models, but since most of the electrical components in the car use 12V, the system still needs DC conversion and a 12V battery, so the 12V battery cannot be replaced in the short term. The 12V start-stop lithium-ion battery directly replaces the lead-acid start-stop, which can realize battery weight reduction, and at the same time, the low-temperature power is relativ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/058H01M10/42
CPCH01M10/0567H01M10/0568H01M10/0569H01M10/0525H01M10/058H01M10/4235H01M2220/20H01M2300/0091H01M2300/0037Y02E60/10Y02P70/50
Inventor 刘长来夏诗忠石月张剑朱彩兵孙光忠
Owner CAMEL GRP NEW ENERGY BATTERY CO LTD
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