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Preparation method and application of electrolyte suitable for ternary positive electrode material

A preparation method and positive electrode material technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve the problems of unfound solute ratio, achieve the effect of maintaining stability, simple and controllable method, and improving rate performance

Inactive Publication Date: 2020-05-12
HUBEI HONGRUN HIGH-TECH NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The two schemes did not find the solute ratio that actually produces an effective protective film on the electrode material

Method used

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  • Preparation method and application of electrolyte suitable for ternary positive electrode material
  • Preparation method and application of electrolyte suitable for ternary positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix ethylene carbonate and dimethyl carbonate in a molar ratio of 2:3, and stir for 10 minutes at a speed of 60 rpm; cool down to room temperature, add lithium bistrifluoromethanesulfonimide, lithium hexafluorophosphate, and lithium nitrate, The ratio is 200:100:1, stir at 200 rpm for 30 minutes, return to room temperature; add lithium bisoxalate borate, the molar ratio of it to lithium hexafluorophosphate is 100:1, and the flame retardant is triphenylphosphoric acid Esters were stirred at a speed of 500 rpm for 10 minutes, the temperature was controlled below 30°C throughout the whole process, and the concentration was 1 mol / L.

Embodiment 2

[0024] Mix ethylene carbonate and dimethyl carbonate at a molar ratio of 1:1, and stir for 10 minutes at a speed of 80 rpm; cool down to room temperature, add lithium bistrifluoromethanesulfonimide, lithium hexafluorophosphate, and lithium nitrate, The ratio is 100:100:1, stir at 200 rpm for 30 minutes, return to room temperature; add lithium bisoxalate borate, the molar ratio of it to lithium hexafluorophosphate is 100:1, and the flame retardant is triphenylphosphoric acid Esters were stirred at 800 rpm for 5 minutes, the temperature was controlled below 30°C throughout the process, and the concentration was 1 mol / L.

Embodiment 3

[0026] Mix ethylene carbonate and dimethyl carbonate at a molar ratio of 2:1, stir for 10 minutes at a speed of 60 rpm; cool down to room temperature, add lithium bistrifluoromethanesulfonimide, lithium hexafluorophosphate, and lithium nitrate, The ratio is 100:100:1, stir at 200 rpm for 30 minutes, return to room temperature; add lithium bisoxalate borate, the molar ratio of it to lithium hexafluorophosphate is 100:1, and the flame retardant is triphenylphosphoric acid Esters were stirred at 800 rpm for 5 minutes, the temperature was controlled below 30°C throughout the process, and the concentration was 2 mol / L.

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PUM

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Abstract

The invention discloses a preparation method and application of an electrolyte suitable for a ternary positive electrode material. The preparation method comprises the following steps: mixing conventional lithium hexafluorophosphate with other lithium salt additives such as lithium nitrate and lithium bis(oxalato)borate according to a certain ratio; adopting a solvent with an optimized ratio to obtain the electrolyte which is excellent in performance and suitable for the ternary positive electrode material battery, wherein the electrolyte forms film protection in the battery circulation process, plays a role in protecting the positive electrode and the negative electrode, solves the common problem that the nickel-rich ternary positive electrode material is corroded by the electrolyte in the charging and discharging process, and provides a new solution for the safety problem of the ternary positive electrode material. The preparation method of the electrolyte is simple in process and easy for industrial production.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to an electrolyte preparation method suitable for ternary cathode materials and its application. Background technique [0002] Ternary cathode material is one of the most widely used battery cathode materials in the lithium-ion battery market. In recent years, safety issues caused by ternary cathode materials have been plaguing the industry. Since the beginning of last year, the choice of power battery route to suppress ternary batteries, and the lifting of the ban on ternary batteries at the end of the year are all concerns caused by the safety of ternary materials. This is because, with the continuous improvement of the energy density of NCM of ternary materials, the thermal stability of materials will become worse and worse. In order to maintain its high specific energy while taking into account cycle life and safety, researchers at home ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/058H01M10/0525H01M10/0568H01M10/42
CPCH01M10/0567H01M10/058H01M10/0525H01M10/0568H01M10/4235Y02E60/10Y02P70/50
Inventor 胡培徐杉史德友刘世琦
Owner HUBEI HONGRUN HIGH-TECH NEW MATERIALS CO LTD