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Solid-state composite electrolyte membrane preparation process and solid-state composite electrolyte membrane

A composite electrolyte membrane and preparation process technology, which is applied in the preparation process of solid composite electrolyte membrane and the field of solid composite electrolyte membrane, can solve the problems of difficult thickness, low mechanical properties of electrolyte membrane, and easy short circuit of positive and negative poles, so as to prevent contact Defective or unstable phenomenon, facilitate battery stacking or winding assembly, and reduce the effect of short circuit risk

Inactive Publication Date: 2021-02-26
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing solid polymer electrolyte membranes are usually prepared by solution casting membrane method. The mechanical properties of the electrolyte films prepared by this method are low, and the thickness is not easy to make thin. Even if a very thin electrolyte film is obtained, its performance is far from meeting Require
Moreover, this method takes a long time, has low production efficiency, and is difficult to control the thickness. The need for large-scale production of all-solid-state batteries
The existing PEO electrolyte, which mainly uses polyethylene oxide (PEO) as a solid polymer electrolyte, has a low melting point. When the battery temperature exceeds the melting point of the electrolyte, the positive and negative electrodes are easily short-circuited.

Method used

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  • Solid-state composite electrolyte membrane preparation process and solid-state composite electrolyte membrane

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Experimental program
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Effect test

Embodiment 1

[0029] 1. Electrolyte solution preparation: dissolve and disperse the polymer matrix PEO, lithium salt bistrifluoromethanesulfonimide lithium LiTFS I, and inorganic oxide electrolyte LLZTO in a mixed solvent of ethylene carbonate and dimethyl carbonate, and stir until the polymer and lithium salt are completely dissolved to obtain low-viscosity electrolyte solution and high-viscosity electrolyte solution respectively. Among them, when the proportion of the polymer matrix is ​​3%wt, the proportion of lithium salt to the polymer matrix is ​​30%wt, and the proportion of oxide electrolyte to the polymer matrix is ​​5%wt, the viscosity of the electrolyte solution is about 2000mpa·s, which is the lowest. viscous electrolyte solution. When the proportion of the polymer matrix is ​​5%wt, the proportion of lithium salt to the polymer matrix is ​​30%wt, and the proportion of oxide electrolyte to the polymer matrix is ​​5%wt, the viscosity of the electrolyte solution is about 19000mpa s,...

Embodiment 2

[0035]1. Electrolyte solution preparation: The polymer matrix PEO, lithium salt LiTFSI and inorganic oxide electrolyte L LZTO were dissolved and dispersed in a mixed solvent of ethylene carbonate and dimethyl carbonate, and stirred until the polymer and lithium salt were completely dissolved. The polymer matrix accounts for 3%wt, the lithium salt accounts for 30%wt of the polymer matrix, the oxide electrolyte accounts for 5%wt of the polymer matrix, and the viscosity of the electrolyte solution is about 2000mpa s, which is a low-viscosity electrolyte solution . The polymer matrix accounts for 5%wt, the lithium salt accounts for 30%wt of the polymer matrix, the oxide electrolyte accounts for 5%wt of the polymer matrix, and the viscosity of the electrolyte solution is about 19000mpa s, which is a high-viscosity electrolyte solution .

[0036] 2. Preparation of solid composite electrolyte membrane:

[0037] The first step: inject the above-mentioned low-viscosity electrolyte so...

Embodiment 3

[0041] 1. Electrolyte solution preparation: The polymer matrix PEO, lithium salt LiTFSI and inorganic oxide electrolyte L LZTO were dissolved and dispersed in a mixed solvent of ethylene carbonate and dimethyl carbonate, and stirred until the polymer and lithium salt were completely dissolved. The polymer matrix accounts for 3%wt, the lithium salt accounts for 30%wt of the polymer matrix, the oxide electrolyte accounts for 5%wt of the polymer matrix, and the viscosity of the electrolyte solution is about 2000mpa s, which is a low-viscosity electrolyte solution . The polymer matrix accounts for 5%wt, the lithium salt accounts for 30%wt of the polymer matrix, the oxide electrolyte accounts for 5%wt of the polymer matrix, and the viscosity of the electrolyte solution is about 19000mpa s, which is a high-viscosity electrolyte solution .

[0042] 2. Preparation of solid composite electrolyte membrane:

[0043] The first step: inject the above-mentioned low-viscosity electrolyte s...

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Abstract

The invention discloses a solid-state composite electrolyte membrane preparation process and a solid-state composite electrolyte membrane. The preparation process of the solid-state composite electrolyte membrane comprises the following steps: by taking a porous flexible membrane as a support matrix of the composite electrolyte membrane, respectively and sequentially attaching a low-viscosity electrolyte solution and a high-viscosity electrolyte solution on at least one side surface of the porous flexible membrane and in a pore structure of the porous flexible membrane step by step in a dip-coating mode, and conducting drying to obtain the solid-state composite electrolyte membrane. The viscosity of the high-viscosity electrolyte solution is higher than that of the low-viscosity electrolyte solution, and the thickness of the solid composite electrolyte membrane is 5 microns to 120 microns.

Description

technical field [0001] The invention relates to the technical field of lithium ions, in particular to a preparation process of a solid composite electrolyte membrane and the solid composite electrolyte membrane. Background technique [0002] Commercial lithium-ion batteries currently mainly use organic liquid electrolytes. However, due to the characteristics of flammability, leakage, and volatility of organic solvents, potential risks such as battery overcharge and short circuit make liquid organic electrolyte lithium-ion batteries have certain safety hazards in use. The all-solid-state lithium battery is expected to solve the safety problems in liquid lithium batteries such as electrolyte leakage, combustion, and short circuit caused by lithium dendrites piercing the separator. [0003] Solid electrolytes are divided into solid inorganic electrolytes and solid polymer electrolytes. Solid-state inorganic electrolytes have high ionic conductivity, but their poor processabil...

Claims

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Application Information

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IPC IPC(8): H01M10/0565H01M10/0525
CPCH01M10/0525H01M10/0565H01M2300/0065H01M2300/0088Y02E60/10
Inventor 张焱陈建刘桃松陈冬党志敏屠芳芳李敏胡雨萌
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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