Method for analyzing lithium ion battery electrolyte salt LiBF4

A lithium-ion battery and electrolyte salt technology, applied in the field of analytical chemistry, can solve problems such as unpublished industry measurement methods by enterprises, and achieve the effect of overcoming error increase and simple operation

Inactive Publication Date: 2013-02-20
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] As of right now, there is no LiBF 4 The national standard for analysis and determination, some companies have never published their industry determination methods

Method used

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  • Method for analyzing lithium ion battery electrolyte salt LiBF4
  • Method for analyzing lithium ion battery electrolyte salt LiBF4
  • Method for analyzing lithium ion battery electrolyte salt LiBF4

Examples

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Embodiment Construction

[0021] A kind of lithium ion battery electrolyte salt LiBF 4 Analytical method, including the following steps:

[0022] ⑴ Prepare and calibrate Na 2 S 2 o 3 .5H 2 O solution: 10g Na 2 S 2 o 3 ·5H 2 O was dissolved in 800mL water, boiled on an electric stove for 10min, and left at room temperature to obtain a concentration of 5×10 -2 ~6×10 -2 mol / L Na 2 S 2 o3 .5H 2 O; using benchmark reagent K 2 Cr 2 o 7 The solution was prepared according to the conventional method for Na 2 S 2 o 3 .5H 2 O for calibration, that is, 0.056mol / L Na 2 S 2 o 3 ·5H 2 O solution standard solution.

[0023] ⑵ Prepare and calibrate KI 3 Solution: Dissolve 15.0 g of KI in water, then add 6.4 g of I 2 After it is completely dissolved, transfer it into a 500mL brown bottle, add water to dilute to the mark, and leave it for 24~48h to get KI 3 solution; pipette 10.00mL of the Na obtained in step ⑴ 2 S 2 o 3 ·5H 2 O solution standard solution in the iodine bottle, diluted with...

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Abstract

The invention relates to a method for analyzing lithium ion battery electrolyte salt LiBF4. The method includes steps of preparing and calibrating a Na2S2O3 5H2O standard solution; preparing and calibrating a K13 standard solution; preparing and calibrating a (C6H5) As4Cl standard solution; preparing 1mol/L of a LiBF4 solution; preparing 0.01 mol of mol/L of the LiBF4 solution; determining a main content four fluorine boric acid roots by a weighting method: placing the LiBF4 solution in a water bath thermostatic bath, adding the (C6H5) As4Cl solution dropwise after 15 minutes to 30 minutes, mixing the mixture during dropwise adding, and obtaining sediment (C6H5) 4AsBF4 after dropwise adding; and ageing the sediment (C6H5) 4AsBF4 in a constant temperature water bath for 30 minutes to 60 minutes and then performing leaching, cleaning and drying to a constant weight, and performing content calculation. According to the method, the operation is simple and rapid, and defects that errors are increased for the increase of the sample dilution ratio as the ion selective electrode method is used are effectively overcome.

Description

technical field [0001] The invention relates to the field of analytical chemistry, in particular to a lithium-ion battery electrolyte salt LiBF 4 Analytical method. Background technique [0002] The electrolyte plays the role of transporting lithium ions between the positive and negative electrodes of the lithium-ion battery. Selecting a suitable electrolyte is a key issue in obtaining a lithium-ion battery with high energy density, long cycle life and high safety. [0003] The typical liquid electrolyte currently used commercially is LiPF 6 Dissolved in a mixed solvent composed of linear carbonates and cyclic carbonates. Although LiPF 6 The base electrolyte system has the advantages of good electrical conductivity and the ability to form a stable SEI film, but this electrolyte is too sensitive to moisture, unstable to heat, and easily releases PF after heating. 5 . To avoid LiPF 6 Due to these shortcomings, people have spent a lot of energy to develop other electrolyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/04
Inventor 周园邓小宇杜秀月李翔年洪恩任秀峰张斌斌曹萌萌
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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