Preparation method of lithium ion battery electrolyte salt LiODFB (lithium oxalyldifluroborate)

A technology of lithium oxalate difluoroborate and lithium oxalate difluoroborate is applied in the field of complete process for the preparation of lithium oxalate difluoroborate (LiODFB), which can solve the problems of unfavorable industrialization, high equipment requirements, and low sample purity. Achieve the effect of avoiding waste and improving utilization
CN104628754AInactive Publication Date: 2015-05-20HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HUNAN ZHENGYUAN ENERGY STORAGE MATERIALS & DEVICE INST
Publication Date
2015-05-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a preparation method of lithium ion battery electrolyte salt LiODFB (lithium oxalyldifluroborate). The method comprises the following steps: performing catalytic synthesis of lithium oxalate and boron trifluoride diethyl ether in a solvent of DMC (dimethyl carbonate) and the like to obtain a liquid-phase mixture and a little unreacted lithium oxalate solid, performing filtration, and then performing evaporative crystallization to obtain crude LiODFB; recrystallizing the crude LiODFB to meet the requirement of lithium ion battery electrolyte salt; and collecting filtered mother liquid and crystallization mother liquid, adding oxalate and a catalyst, performing catalytic conversion to obtain a liquid-phase mixture which mainly contains LiODFB, and performing evaporative crystallization again. The technological process is low in cost, the purity of the prepared LiODFB is above 99.9%, the yield is above 90%, and the method is convenient to operate, has favorable economic benefits and environmental benefits and is suitable for industrial production.
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Description

technical field

[0001] The invention relates to a complete process flow for the preparation of lithium-ion battery electrolyte salts, in particular to a complete process flow for the preparation of lithium oxalate difluoroborate (LiODFB), which belongs to the technical field of lithium-ion battery materials. Background technique

[0002] Electrolyte salt is an important part of lithium-ion batteries, and its research and development is very important to the performance and development of lithium-ion secondary batteries. Lithium oxalate difluoroborate (LiODFB) can be regarded as half lithium oxalate borate (LiBOB) and half lithium tetrafluoroborate (LiBF4) in terms of chemical structure, and its performance cleverly combines the advantages of both. Lithium oxalate difluoroborate (LiODFB) has excellent high and low temperature performance, and has good electrochemical performance at -20°C and 60°C; it can well support current collector copper foil and aluminum foil; it has goo...

Claims

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