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Start-stop battery electrolyte and lithium ion battery

A technology for starting and stopping batteries and electrolytes, which is applied in the field of lithium-ion batteries to achieve the effects of good power and high temperature cycle performance, low impedance and low impedance.

Inactive Publication Date: 2019-12-10
CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional lithium-ion battery electrolytes are often difficult to meet the balance between low temperature and high temperature, power and life, so the development of low impedance, high conductance, high stability, electrolyte solution for start-stop batteries The application development of the

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  • Start-stop battery electrolyte and lithium ion battery

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Effect test

Embodiment 1

[0024] An electrolyte solution for start-stop batteries, the components of which include lithium salts, carbonate organic solvents, and functional additives. The mass fractions of each component in the lithium salt in the electrolyte of the start-stop battery are: lithium hexafluorophosphate LiPF 6 7.5%, lithium bisfluorosulfonimide LiFSI 9.0%. The carbonate organic solvent includes three components, and the mass fractions of the three components in the start-stop battery electrolyte are: 20% ethylene carbonate EC, 30.5% ethyl methyl carbonate EMC and 32% dimethyl carbonate DMC. The functional additive includes two components, and the mass fractions of the two components in the electrolyte solution of the start-stop battery are: lithium difluorophosphate LiPO 2 f 2 0.7% and lithium difluorobisoxalate phosphate LiPF 2 (C 2 o 4 ) 2 0.3%.

[0025] The preparation method of the start-stop battery electrolyte of this embodiment is: uniformly mixing lithium salt, carbonate...

Embodiment 2

[0028] An electrolyte solution for start-stop batteries, the components of which include lithium salts, carbonate organic solvents, and functional additives. The mass fractions of each component in the lithium salt in the electrolyte of the start-stop battery are: lithium hexafluorophosphate LiPF 6 12.5% ​​and LiFSI 3.0%. The carbonate organic solvent includes two components, and the mass fractions of the two components in the electrolyte solution of the start-stop battery are 25% of ethylene carbonate EC and 58% of ethyl methyl carbonate EMC. Functional additives include three components, and the mass fractions of the three components in the start-stop battery electrolyte are: vinylene carbonate VC 0.3%, vinyl sulfate DTD 0.7% and lithium difluorophosphate LiPO 2 f 2 0.5%.

[0029] The preparation method of the start-stop battery electrolyte of this embodiment is: uniformly mixing lithium salt, carbonate organic solvent, and functional additives.

[0030] Lithium-ion ba...

Embodiment 3

[0032] An electrolyte solution for start-stop batteries, the components of which include lithium salts, carbonate organic solvents, and functional additives. The mass fractions of each component in the lithium salt in the electrolyte of the start-stop battery are: lithium hexafluorophosphate LiPF6 12.5% ​​and LiFSI 3.0%. The carbonate organic solvent includes three components, and the mass fractions of the three components in the start-stop battery electrolyte are: ethylene carbonate EC 25%, ethyl methyl carbonate EMC 42% and dimethyl carbonate DMC 15%. Functional additives include three components, and the mass fractions of the three components in the start-stop battery electrolyte are: vinylene carbonate VC 0.5%, vinyl sulfate DTD 0.8% and lithium difluorophosphate LiPO 2 f 2 0.5%.

[0033] The preparation method of the start-stop battery electrolyte of this embodiment is: uniformly mixing lithium salt, carbonate organic solvent, and functional additives.

[0034] Lithiu...

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Abstract

The invention belongs to the technical field of lithium ion batteries and discloses a start-stop battery electrolyte and a lithium ion battery. The electrolyte is prepared from the following components in percentage by mass: 12-20% of lithium salt, 78-85% of a carbonic ester organic solvent and 1-3% of a functional additive. The lithium salt is prepared from the following components: 0.5-16% of lithium hexafluorophosphate and 0.5-18% of lithium bis(fluorosulfonyl)imide. The functional additive comprises at least two of the following components in percentage by mass: 0.3-1.5% of vinylene carbonate, 0.5-1% of ethylene sulfate, 0.5-1% of lithium difluorophosphate and 0.1-0.5% of lithium difluorobisoxalate phosphate. The positive electrode of the lithium ion battery is super nano lithium ironphosphate LFP, the particle size D50 is 0.2-2.0 microns, and the negative electrode of the lithium ion battery is at least one of artificial graphite, natural graphite, mesocarbon microbeads, soft carbon and hard carbon. The start-stop battery electrolyte disclosed by the invention has relatively high conductivity, relatively low interface impedance and relatively good thermal stability, gives consideration to high-temperature and low-temperature performance of the battery, and has outstanding power and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to an electrolyte solution of a start-stop battery and a lithium ion battery. Background technique [0002] In recent years, my country's automobile industry has developed rapidly, and the number of domestic automobiles has also continued to increase. In the face of the increasingly serious energy and environmental crisis, the state has promulgated a number of laws and regulations on energy conservation and emission reduction of automobiles, and clarified the target limit of the average fuel consumption of new passenger cars to be as low as 5L / 100km in 2020, and the electrification of automobiles is The best technical route, among which the development of 48V mild hybrid power system is the most economical. The 48V hybrid power system can realize coasting start-stop, kinetic energy recovery, auxiliary acceleration and other functions, and the fuel saving rate is 14%-1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M2220/20H01M2300/0025Y02E60/10
Inventor 陈立鹏郑和勇邓茁陈念
Owner CAMEL GRP WUHAN OPTICS VALLEY R&D CENT CO LTD
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