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Lithium maleate difluoroborate and electrolyte for lithium secondary battery containing the same

A technology of lithium maleate difluoroborate and lithium secondary battery, which is applied in the application field of lithium secondary battery and lithium secondary battery electrolyte, and can solve the problem of poor low-temperature conductivity, low decomposition temperature of lithium hexafluorophosphate, and limited lithium Ion battery applications and other issues to achieve the effect of improving cycle life and cycle life

Active Publication Date: 2017-09-22
周阳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolyte is composed of lithium salt, solvent and additives. The traditional electrolyte uses lithium hexafluorophosphate as the main lithium salt. Lithium hexafluorophosphate has a low decomposition temperature and poor conductivity at low temperatures, which limits the application of lithium-ion batteries in the field of electric vehicles.

Method used

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  • Lithium maleate difluoroborate and electrolyte for lithium secondary battery containing the same
  • Lithium maleate difluoroborate and electrolyte for lithium secondary battery containing the same
  • Lithium maleate difluoroborate and electrolyte for lithium secondary battery containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Lithium maleate difluoroborate was prepared from boron trifluoride-diethyl ether solution, lithium maleate, trimethylmethoxysilane and maleic acid as raw materials.

[0043]In a reaction flask equipped with a magnetic stirrer, 127.9 g of lithium maleate was added, 500 mL of acetonitrile was added, stirring was started, and 288 g of boron trifluoride-ether solution was slowly added dropwise thereto. After the dropwise addition was completed, the stirring was continued. After all the solid materials were dissolved, 116.07 g of maleic acid was added, and 208.4 g of trimethylmethoxysilane was slowly added dropwise, and the mixture was reacted at 20° C. for 10 hours. To fully convert the raw materials. Stop heating and cool to room temperature naturally. The solvent and by-products were distilled off under reduced pressure. The reaction solution was concentrated and crystallized, and filtered under nitrogen protection. The filter cake was vacuum-dried at a temperature of ...

Embodiment 2

[0046] Lithium maleate difluoroborate was prepared from boron trifluoride-diethyl ether solution, lithium fluoride, trimethylethoxysilane and maleic acid.

[0047] In a reactor equipped with a heating and magnetic stirring device, 25.9 g of lithium fluoride and 500 mL of dimethyl carbonate were added, stirring was started, and 144.2 g of boron trifluoride-diethyl ether solution was slowly added dropwise therein. After the dropwise addition is completed, continue to stir until all solid materials are dissolved. Add 116.07 g of maleic acid, slowly add 236.5 g of trimethylethoxysilane at room temperature, heat to 80° C., and react for 2 hours. To fully convert the raw materials. Stop heating and cool to room temperature naturally.

[0048] The reaction solution was concentrated and crystallized, and filtered under nitrogen protection. The filter cake was vacuum-dried at a temperature of 60-80° C. for 48 hours. Finally, 135.8 g of white powdery solids were obtained, with a yie...

Embodiment 3

[0051] Lithium maleate difluoroborate was prepared from boron trifluoride-acetonitrile solution, lithium fluoride and diethyl aluminum monochloride maleate.

[0052] In a reactor equipped with a heating and magnetic stirring device, 25.94 g of lithium fluoride and 1000 mL of diethyl carbonate were added, stirring was started, and 141.9 g of boron trifluoride-ether solution was slowly added dropwise therein. After the dropwise addition, continue to stir until all solid materials are dissolved, slowly add 241g of diethylaluminum monochloride at room temperature, add 116.07g of maleic acid, heat to 60°C, and react for 4 hours. To fully convert the raw materials. Stop heating and cool to room temperature naturally.

[0053] The reaction solution was concentrated and crystallized, and filtered under nitrogen protection. The filter cake was vacuum-dried at a temperature of 60-80° C. for 48 hours. Finally, 169.5 g of white powdery solid was obtained with a yield of 99%.

[0054] ...

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Abstract

The invention aims to provide a LiDFMB salt which is a novel Li secondary battery electrolyte salt. LiDFMB is characterized in that C4H4O4 or a C4H4O4 molecule containing substituent groups is substituted for two F atoms of LiBF4 in the structure. The LiDFMB salt can be applied to an Li-ion battery electrolyte, can be taken as an additive to be matched with other Li salts for use so as to improve the low-temperature discharge performance of a Li secondary battery and prolong the normal-temperature and high-temperature service life of the Li secondary battery and can be also taken as a main salt to replace or partially replace LiPF6 and the like.

Description

technical field [0001] The invention relates to a novel lithium ion battery electrolyte lithium salt—maleic acid lithium difluoroborate, and its application in lithium secondary batteries and lithium secondary battery electrolytes. Background technique [0002] At present, lithium-ion batteries are the best power supply option for electric vehicles. Electrolyte is an important part of lithium-ion batteries, which determines the capacity, life and discharge rate of batteries. The electrolyte is composed of lithium salt, solvent and additives. The traditional electrolyte uses lithium hexafluorophosphate as the main lithium salt. Lithium hexafluorophosphate has a low decomposition temperature and poor conductivity at low temperatures, which limits the application of lithium-ion batteries in the field of electric vehicles. [0003] Lithium maleate difluoroborate, hereinafter referred to as LiDFMB, is a new type of lithium salt, which has a high decomposition temperature, good lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F5/02H01M10/0567H01M10/0568H01M10/0525
CPCC07F5/025H01M10/0525H01M10/0567H01M10/0568Y02E60/10
Inventor 周阳
Owner 周阳
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