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Preparation method of composite polymer electrolyte and lithium secondary battery

A technology of composite polymer and sulfide electrolyte, applied in the field of preparation of composite polymer electrolyte, can solve the problems of high cost, insufficiently uniform composite with polymer, complicated sulfide electrolyte process, etc.

Inactive Publication Date: 2016-11-09
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of sulfide electrolyte by solid phase method (high-energy ball milling method) is complicated, costly, and the particles are large, and the composite with polymer is not uniform enough. Large particles often limit the improvement of composite electrolyte performance.

Method used

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  • Preparation method of composite polymer electrolyte and lithium secondary battery
  • Preparation method of composite polymer electrolyte and lithium secondary battery
  • Preparation method of composite polymer electrolyte and lithium secondary battery

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[0033] The embodiment of the present invention discloses a method for preparing a composite polymer electrolyte, comprising the following steps:

[0034] A), mixing the polymer matrix, the alkali metal salt and the solvent to obtain a mixed solution; mixing the sulfide electrolyte raw material with the solvent, heating and stirring, and obtaining a sulfide electrolyte precursor slurry after the reaction;

[0035] B), mixing the mixed solution with the material to obtain a composite electrolyte solution;

[0036] C), drying the composite electrolyte solution and then heat-treating to obtain a composite polymer electrolyte;

[0037] The general formula of the sulfide electrolyte in the sulfide electrolyte precursor slurry is one or more of formula (I) and formula (II);

[0038] (100-a-b)Li 2 S·aP 2 S 5 bM (I);

[0039] Among them, 02 o 5 , Li 3 PO 4 , LiO 2 , SiO 2 , Fe 2 o 3 , ZrO 2 , ZnO, TiO 2 , La 2 o 3 , Nb 2 o 5 and GeO 2 one or more of

[0040] (100-y)[(...

Embodiment 1

[0058] Under the protection of argon atmosphere, after weighing PEO and LiTFSI according to the EO / Li molar ratio of 18:1, stir in acetonitrile to obtain solution A; 2 S and P 2 S 5 According to the molar ratio of 70:30, it is weighed and added into acetonitrile, stirred evenly at 50°C to obtain 70Li 2 S·30P 2 S 5 Slurry B; according to 70Li 2 S·30P 2 S 5 Accounting for 1% of the total mass of the composite polyelectrolyte, mix solution A and slurry B, and obtain solution C after stirring evenly; cast the solution C to be cast into a molding mold, place it at 40°C for 24 hours, let the solvent volatilize, and then place Heat treatment at 250° C. for 0.5 h in a muffle furnace to completely volatilize the solvent to obtain a composite polymer electrolyte.

[0059] Using stainless steel as the blocking electrode, the electrochemical AC impedance test was carried out at different temperatures, and its conductivity was calculated. The results are as follows: figure 1 as sho...

Embodiment 2

[0063] Under the protection of argon atmosphere, after weighing PEO and LiTFSI according to the EO / Li molar ratio of 18:1, stir in acetonitrile to obtain solution A; 2 S, P 2 S 5 and LiI were weighed into acetonitrile according to the ratio of molar ratio (100-1)×(70:30):1, and stirred evenly at 50°C to obtain 99(70Li 2 S·30P 2 S 5 ) · 1LiI slurry B; according to 99 (70Li 2 S·30P 2 S 5 ) 1 LiI sulfide electrolyte accounted for 1% of the total mass of the composite electrolyte Mix solution A and slurry B, stir evenly to obtain solution C; cast solution C to be cast in a polytetrafluoroethylene mold, place in 50°C After 30 hours, the solvent was volatilized, and then placed in a muffle furnace for heat treatment at 250° C. for 0.5 h to completely volatilize the solvent to obtain a composite polymer electrolyte.

[0064] Using stainless steel as the blocking electrode, the electrochemical AC impedance test was carried out at different temperatures, and its conductivity was...

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Abstract

The invention provides a preparation method of composite polymer electrolyte. The preparation method comprises the following steps: (A) mixing a polymer matrix, an alkali metal salt and a solvent to obtain a mixed solution; mixing a sulfide electrolyte raw material with the solvent; heating and stirring; reacting to obtain sulfide electrolyte precursor slurry; (B) mixing the mixed solution with the sulfide electrolyte precursor slurry to obtain a composite electrolyte solution; and (C) after drying the composite electrolyte solution, carrying out heat treatment to obtain the composite polymer electrolyte. The composite polymer electrolyte is prepared by adopting a liquid-phase method and sulfide electrolyte is more finely and more uniformly distributed on the polymer matrix; and finally, the composite polymer electrolyte has relatively good chemical stability and ion conductivity.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to a preparation method of a composite polymer electrolyte and a lithium secondary battery. Background technique [0002] Lithium secondary batteries are widely used in daily life with many advantages such as large output power, high energy density, excellent cycle performance, no memory effect, and no environmental pollution. Competitive vehicle power battery. However, the organic solvent electrolytes used in traditional batteries often cause safety hazards due to leakage and volatilization of liquid electrolytes, resulting in combustion and explosion. [0003] Solid-state batteries use solid electrolytes to replace traditional organic liquid electrolytes. Compared with traditional liquid lithium-ion batteries, they reduce the use of electrolytes, separators and even binders, which not only avoids safety problems such as electrolyte leakage, but also because so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0564H01M10/0561H01M10/0525
CPCH01M10/0525H01M10/0561H01M10/0564H01M2300/0025H01M2300/0088Y02E60/10
Inventor 许晓雄赵嫣然陈少杰陈博
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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