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Self-healing solid polymer electrolyte for lithium battery and preparation method of solid polymer electrolyte

A solid polymer and electrolyte technology, applied in the field of lithium-ion batteries, can solve the problems of low ion conductivity, large interface impedance between solid electrolyte and positive and negative electrodes, etc., and achieve excellent ion conductivity, excellent self-healing performance, pore size evenly distributed effect

Active Publication Date: 2019-09-10
TIANNENG SAFT ENERGY JOINT CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a self-healing solid polymer electrolyte for lithium-ion batteries, to solve the problem of low ion conductivity in existing polymer electrolytes and relatively large interface impedance between the solid electrolyte and the positive and negative electrodes And other issues

Method used

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  • Self-healing solid polymer electrolyte for lithium battery and preparation method of solid polymer electrolyte
  • Self-healing solid polymer electrolyte for lithium battery and preparation method of solid polymer electrolyte
  • Self-healing solid polymer electrolyte for lithium battery and preparation method of solid polymer electrolyte

Examples

Experimental program
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Effect test

Embodiment 1

[0043]In terms of weight percentage, the composition is: 40g of acetone, 60g of N,N-dimethylformamide, 25g of silyl-terminated polyether (molecular weight is about 10000) (ether bond is about 25 / 58.08=0.43mol), bis Lithium (fluorosulfonyl)imide (0.43 / 10mol) 8.04g, PVDF-HFP 1.25g.

[0044] The preparation process is:

[0045] (1) take by weighing the acetone of 40g;

[0046] (2) Dissolve 8.04 g of lithium bis(fluorosulfonyl)imide in acetone;

[0047] (3) After the lithium bis(fluorosulfonyl)imide is fully dissolved, add 25 g of silyl-terminated polyether, and stir at 35° C. until the polyether is completely dissolved in acetone to form a viscous liquid.

[0048] (4) Weigh 60g of N,N-dimethylformamide;

[0049] (5) Dissolve 1.25g of PVDF-HFP in N,N-dimethylformamide while stirring at 35°C.

[0050] (6) Mix the two solvents, stir at 35°C for 1 hour, ultrasonically disperse for 1 hour, keep at 45°C, and continue stirring until the viscosity is higher than 1000 centipoise.

[...

Embodiment 2

[0055] In terms of weight percentage, the composition is: 40g of acetone, 60g of N,N-dimethylformamide, 50g of silyl-terminated polyether (molecular weight is about 10000) (ether bond is about 50 / 58.08=0.86mol), bis Lithium (fluorosulfonyl)imide (0.86 / 10mol) was 16.1 g, and PVDF-HFP was 10.0 g.

[0056] The preparation process is:

[0057] (1) take by weighing the acetone of 40g;

[0058] (2) Dissolve 16.1 g of lithium bis(fluorosulfonyl)imide in acetone;

[0059] (3) After the lithium bis(fluorosulfonyl)imide is fully dissolved, add 50 g of silyl-terminated polyether, and stir at 35° C. until the polyether is completely dissolved in acetone to form a viscous liquid.

[0060] (4) Weigh 60g of N,N-dimethylformamide;

[0061] (5) Dissolve 10.0 g of PVDF-HFP in N,N-dimethylformamide while stirring at 35°C.

[0062] (6) Mix the two solvents, stir at 35°C for 1 hour, ultrasonically disperse for 1 hour, keep at 45°C, and continue stirring until the viscosity is higher than 1000 ...

Embodiment 3

[0067] In terms of weight percentage, the composition is: 40g of acetone, 60g of N,N-dimethylformamide, 50g of silyl-terminated polyether (molecular weight is about 10000) (ether bond is about 50 / 58.08=0.86mol), bis Lithium (fluorosulfonyl)imide (0.86 / 10mol) 16.1g, PVDF-HFP 2.5g, garnet-type Li 7 La 3 Zr 2 o 12 (LLZO) Nanopowder 1.0 g.

[0068] The preparation process is:

[0069] (1) take by weighing the acetone of 40g;

[0070] (2) Dissolve 16.1 g of lithium bis(fluorosulfonyl)imide in acetone;

[0071] (3) After the lithium bis(fluorosulfonyl)imide is fully dissolved, add 50 g of silyl-terminated polyether, and stir at 35° C. until the polyether is completely dissolved in acetone to form a viscous liquid.

[0072] (4) Weigh 60g of N,N-dimethylformamide;

[0073] (5) Stirring at 35°C, dissolve 2.5g of PVDF-HFP in N,N-dimethylformamide.

[0074] (6) Mix the two solvents, stir at 35°C for 1 hour, then add garnet-type Li to the viscous liquid 7 La 3 Zr 2 o 12 (LLZO)...

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Abstract

The invention discloses a self-healing solid electrolyte for a lithium battery and a preparation method of the solid electrolyte, and belongs to the technical field of lithium ion batteries. The electrolyte comprises the following components of silyl-terminated polyether, bis (fluorosulfonyl) lithium imide, organic auxiliaries, additives, a first solvent and a second solvent, wherein the first solvent is used for dissolving silyl-terminated polyether and bis (fluorosulfonyl) lithium imide, and the second solvent is used for dissolving the organic auxiliaries; based on 100 parts of total mass of the first solvent and the second solvent, the usage of the silyl-terminated polyether is 25-50 parts; the molar ratio of the mole number of bis (fluorosulfonyl) lithium imide to the mole number of silyl-terminated polyether is 1 to 10-30; the usage of the organic auxiliaries is 1-10 parts; and the usage of the additives is 0-15 parts. By virtue of the novel self-healing solid electrolyte material provided by the invention, the performance of the energy density, the cycle life, the rate discharge and the like of the battery are not lower than those of the existing liquid organic electrolyte.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a self-healing solid electrolyte formula and a preparation method thereof. Background technique [0002] A lithium-ion battery is a secondary rechargeable battery that primarily relies on the movement of lithium ions between positive and negative electrodes to function. During the charging and discharging process, Li + intercalation and deintercalation back and forth between the two electrodes: when charged, the Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. [0003] Batteries generally use materials containing lithium as electrodes, which are representatives of modern high-performance batteries. The electrolyte is a lithium salt such as lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0082Y02E60/10
Inventor 陈飞李明钧孙伟陈跃武金宏强李艳
Owner TIANNENG SAFT ENERGY JOINT CO
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