Title:
PREPARATION METHOD OF HIGH-PURITY LITHIUM SALT BY MIXTURE IN PREDETERMINED RATIO AND APPLICATIONS OF THE LITHIUM SALT
Document Type and Number:
Japanese Patent JP2020147558
Kind Code:
A
Abstract:
To provide a production method of a high-purity lithium salt and to provide a lithium ion battery containing the lithium salt.SOLUTION: The production method of a lithium salt includes: a step of purifying lithium oxalate for industrial use; a synthetic reaction step of reacting lithium oxalate with boron trifluoride-ethyl ether to produce a mixed reaction liquid of lithium difluoro(oxalato)borate and tetrafluoroboric acid lithium and then purifying the reaction liquid with an auxiliary filtration membrane for purification; a step of concentrating and crystallizing the reaction liquid; and a step of subjecting a mixed lithium salt to purification and drying. The high-purity lithium salt is a mixed lithium salt including lithium difluoro(oxalato)borate and tetrafluoroboric acid lithium in a predetermined ratio of a molar ratio 1:1 and is applicable for a nonaqueous electrolyte for a lithium ion battery.SELECTED DRAWING: Figure 1
Inventors:
DU JIANWEI
YANG BING
ZHONG ZIFANG
ZHOU TONG
CAO QINGQING
WU JIE
YANG BING
ZHONG ZIFANG
ZHOU TONG
CAO QINGQING
WU JIE
Application Number:
JP2019091092A
Publication Date:
September 17, 2020
Filing Date:
May 14, 2019
Export Citation:
Assignee:
SHANSHAN ADVANCED MAT QUZHOU CO LTD
International Classes:
C07F5/02; C07F1/02; H01M10/0525; H01M10/0568
Domestic Patent References:
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Foreign References:
| CN107546415A | 2018-01-05 | |||
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Attorney, Agent or Firm:
sk patent corporation
Akihiko Okuno
Hiroyuki Ito
Akihiko Okuno
Hiroyuki Ito