A chain fluoroester compound and its use as an electrolyte solvent for lithium ion batteries

A technology of lithium ion batteries and ester compounds, which is applied in the field of lithium ion batteries, can solve the problems of volume expansion and discharge capacity reduction, material structure distortion, and cycle performance of lithium ion secondary batteries, etc., so as to reduce flammability and improve flame retardancy. Effects and safety effects

Inactive Publication Date: 2019-01-25
SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the high-voltage cathode materials that have been reported include LiCoPO 4 、LiNiPO 4 and LiNi 0.5 mn 1.5 etc., its charging voltage platform is close to or higher than 5V, but the matching non-aqueous organic electrolyte seriously lags behind the development of high-voltage cathode materials, which limits the application of lithium-ion secondary batteries
For example, the positive electrode material has a strong oxidizing property during the charging process, and a side reaction will occur with the electrolyte during the charging process to generate CO 2 、H 2 Oxidation products such as O,...

Method used

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  • A chain fluoroester compound and its use as an electrolyte solvent for lithium ion batteries
  • A chain fluoroester compound and its use as an electrolyte solvent for lithium ion batteries
  • A chain fluoroester compound and its use as an electrolyte solvent for lithium ion batteries

Examples

Experimental program
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Effect test

Embodiment 1-1

[0028] Electrolyte preparation steps: In a glove box filled with argon, ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) were mixed according to the weight ratio of 25:5 : 50:20 ratio is mixed, then to the mixed solvent, add the chain fluorocarbonate solvent (specifically as shown in the list) shown in the compound (1) based on the total mass of solvent 5wt%, and slowly add 12.5 wt% lithium hexafluorophosphate, after that, add 0.5% vinylene carbonate (VC), 1.5% 1,3-propane sultone (1,3-PS), 1% difluoro Lithium phosphate (LiPO 2 f 2 ), 1% fluoroethylene carbonate (FEC), and stir to obtain the lithium-ion battery electrolyte of Example 1-1.

[0029] Inject the prepared non-aqueous electrolyte solution for lithium-ion batteries into fully dried 4.5V lithium cobalt oxide / graphite soft-pack batteries, and perform battery performance tests after shelving at 45°C, high-temperature fixture formation, and secondary sealing....

Embodiment 2-1

[0045] Electrolyte preparation steps: In a glove box filled with argon, ethylene carbonate (EC), propylene carbonate (PC), ethyl methyl carbonate (EMC) and diethyl carbonate (DEC) were mixed according to the weight ratio of 25:5 :50:20 ratio is mixed, then in the mixed solvent, add the chain fluorocarboxylate solvent (specifically as shown in table 2) shown in the compound (11) based on solvent gross mass 5wt%, and slowly Add 12.5wt% lithium hexafluorophosphate, after that, add 0.5% vinylene carbonate (VC), 1.5% 1,3-propane sultone (1,3-PS), 1% Lithium difluorophosphate (LiPO 2 f 2 ), 1% fluoroethylene carbonate (FEC), and stir to obtain the lithium-ion battery electrolyte of Example 2-1.

[0046] Inject the prepared non-aqueous electrolyte solution for lithium-ion batteries into fully dried 4.5V lithium cobalt oxide / graphite soft-pack batteries, and perform battery performance tests after shelving at 45°C, high-temperature fixture formation, and secondary sealing. , to o...

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Abstract

The invention discloses a chain-shaped fluoroester compound and the use thereof as an electrolyte solvent of a lithium ion battery. The chain fluorinated ester compound comprises a chain fluorinated carbonate compound and a chain fluorinated carboxylic acid ester compound, wherein the chain fluorinated ester compound improves the overall oxidation decomposition voltage of the electrolyte, has goodwettability, can optimize the electrode interface, reduce the impedance between the interfaces, and improves the low-temperature performance. The addition of the chain fluoroester electrolyte solventof the invention improves the high-temperature resistance and high-pressure resistance stability of the lithium ion battery, improves the rate performance of the battery, and is a novel second-generation lithium ion battery solvent.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a chain fluorinated ester compound and its use as a solvent for the electrolyte of lithium ion batteries. Background technique [0002] In recent years, the development of lithium-ion batteries has received widespread attention, and it has developed rapidly in the field of mobile phone digital, electric vehicles, electric bicycles, electric tools, and energy storage. Due to people's increasing requirements for battery life, batteries with high energy density have become a research hotspot. On the one hand, electrode materials with high energy density, such as high-nickel materials, lithium-rich manganese bases, and silicon-carbon anodes, have attracted a lot of attention; on the other hand, high-voltage lithium-ion batteries are also the main trend of current research. This poses new challenges to battery materials. [0003] At present, the high-voltage cathode materials th...

Claims

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Application Information

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IPC IPC(8): H01M10/0569H01M10/0525
CPCH01M10/0525H01M10/0569H01M2300/0028Y02E60/10
Inventor 杜建委朱学全郭力
Owner SHANSHAN ADVANCED MATERIALS QUZHOU CO LTD
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