Compound polymer electrolyte material, preparation method thereof, electrolyte membrane and all-solid-state lithium secondary battery

A technology of composite polymers and electrolyte materials, applied in the field of polymer electrolyte membranes, can solve problems such as low metal lithium stability and electrochemical window

Inactive Publication Date: 2016-03-23
JIANGXI GANFENG BATTERY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of solid polymer electrolyte has low lithium metal stability and electrochemical window

Method used

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  • Compound polymer electrolyte material, preparation method thereof, electrolyte membrane and all-solid-state lithium secondary battery
  • Compound polymer electrolyte material, preparation method thereof, electrolyte membrane and all-solid-state lithium secondary battery
  • Compound polymer electrolyte material, preparation method thereof, electrolyte membrane and all-solid-state lithium secondary battery

Examples

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preparation example Construction

[0076] The present invention provides a method for preparing a composite polymer electrolyte material described in the above technical solution, comprising the following steps:

[0077] Mixing the polymer matrix, alkali metal salt, solvent and sulfide inorganic electrolyte to obtain a composite electrolyte solution;

[0078] The composite electrolyte solution is sequentially cast and dried to obtain a composite polymer electrolyte material.

[0079] The invention adopts solution casting method to prepare composite polymer electrolyte material.

[0080] The invention mixes polymer matrix, alkali metal salt, solvent and sulfide inorganic electrolyte to obtain composite electrolyte solution.

[0081] In the present invention, the type, source and amount of the polymer matrix, alkali metal salt and sulfide inorganic electrolyte are consistent with the type, source and amount of the polymer matrix, alkali metal salt and sulfide inorganic electrolyte described in the above technica...

Embodiment 1

[0095] Under the protection of argon atmosphere, PEO and LiTFSI were weighed according to the EO / Li molar ratio of 18:1, stirred in acetonitrile (ACN), and after the stirring was uniform, 1% Li 10 GeP 2 S 12 , continue to stir to obtain a casting solution; cast the casting solution in a polytetrafluoroethylene mold, place it at room temperature for 24 hours to volatilize the solvent, and then place it in an oven at 50°C for 48 hours to completely volatilize the solvent to obtain a composite polymer electrolyte membrane . Using stainless steel as the blocking electrode, the electrochemical impedance spectroscopy (EIS) test was carried out at different temperatures to calculate its conductivity. The results are as follows: figure 1 as shown, figure 1 It is the conductivity spectrum of the organic / inorganic composite electrolyte membranes prepared in Example 1 and Comparative Example of the present invention as a function of temperature. From figure 1 It can be seen that the...

Embodiment 2

[0097] Under the protection of argon atmosphere, PEO and LiTFSI were weighed according to the EO / Li molar ratio of 15:1, stirred in tetrahydrofuran (THF), and after the stirring was uniform, 1% Li 2 S-P 2 S 5 -P 2 o 5 (70:29:1), continue stirring to obtain a casting solution; cast the casting solution in a polytetrafluoroethylene mold, place it at room temperature for 24 hours to evaporate the solvent, and then dry it in an oven at 50°C for 48 hours to completely evaporate the solvent , to obtain a composite polymer electrolyte membrane. Using stainless steel as the blocking electrode, EIS tests were carried out at different temperatures to calculate its conductivity. The results are as follows: Figure 6 as shown, Figure 6 It is the conductivity spectrum of the composite polymer electrolyte membrane prepared in Example 2 of the present invention as a function of temperature. From Figure 6 It can be seen that the ionic conductivity of this system is 9.09×10 at 80°C -...

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Abstract

The invention provides a compound polymer electrolyte material, a preparation method thereof, an electrolyte membrane and an all-solid-state lithium secondary battery. The electrolyte material is prepared from a polymer matrix, alkali metal salt and sulfide inorganic electrolyte. The sulfide inorganic electrolyte is prepared from lithium-ion conductors with the general formulas in formula I(Li4-x1Ge1-x1Px1S4), the formula II (Li10+x2G1+x2P2-x2S12) and the formula III (Li3+5x3P1-x3S4) or Li2S-M type lithium-ion conductors. In the formula I, x1 is larger than 0 and smaller than 1; in the formula II, x2 is equal to 0 or 1, and G is selected from Si, Ge or Sn; in the formula III, x3 is larger than 3 and smaller than 0.27. M is selected from the compound of P2S5 and D. D is selected from one or more of LiI, Li3PO4, Li4SiO4, P2O5 and P2S3. The compound polymer electrolyte material has high lithium stability, an electromechanical window and high electric conductivity.

Description

technical field [0001] The invention relates to the technical field of polymer electrolyte membranes, in particular to a composite polymer electrolyte material and a preparation method thereof, an electrolyte membrane and an all-solid 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. The most competitive vehicle power battery. However, there are many safety problems due to the use of flammable, volatile, and highly reactive organic liquid electrolytes in lithium secondary batteries. For example, the main component of liquid electrolyte is carbonate, which has a very low flash point and low boiling point, and will burn or even explode under certain conditions. At present, the solution is to use other electrolyte materials instead of organic liquid electrolytes, suc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/056H01M10/0565
CPCH01M10/052H01M10/056H01M10/0565Y02E60/10
Inventor 许晓雄赵嫣然陈少杰黄宁陈晓添
Owner JIANGXI GANFENG BATTERY TECH
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