Lithium bis(oxalato)borate preparation method
A technology of lithium bis-oxalate borate and oxalic acid is applied in the field of preparation of lithium bis-oxalate borate, can solve the problems of harsh preparation conditions, high cost of raw materials, poor thermal stability, etc., achieves cheap and easy-to-obtain raw materials, simple and feasible process, and improved film formation. performance effect
Inactive Publication Date: 2019-01-18
湖南科霸汽车动力电池有限责任公司
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The invention provides a lithium bis(oxalato)borate preparation method. The preparation method comprises the steps: weighing lithium hydroxide, oxalic acid and boric acid according to a certain molarratio; then respectively drying lithium hydroxide, oxalic acid and boric acid; then putting the dried lithium hydroxide, oxalic acid and boric acid into a ball mill to be evenly ball milled to form amixture; then dry pressing the mixture into pieces under the certain pressure P; then putting into a container; reacting under the vacuum environment with a temperature as 105 to 130 DEG C for 5 to 8h; then putting into the vacuum environment with a temperature as 140 to 170 DEG C to react for 12 to 24 h to prepare a lithium bis(oxalato)borate crude product; then grinding the lithium bis(oxalato)borate crude product into powder; fully dissolving into distilled anhydrous acetonitrile; filtering to obtain filtrate; evaporating and concentrating the filtrate until the residual liquid is 1 to 2%of the total amount of the filtrate; finally, pouring the residual liquid and drying a product which is prepared by evaporating and concentrating the filtrate to obtain lithium bis(oxalato)borate. According to the method disclosed by the invention, a technology is simple, the raw materials are cheap and easy to obtain, and the purity of the prepared product is extremely high.
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