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All-solid-state polymer electrolyte with semi-interpenetrating network structure, and preparation method of electrolyte

An all-solid polymer and network structure technology, applied in the field of all-solid polymer electrolytes and their preparation, can solve the durability requirements and industrial applications of lithium-ion batteries without materials, solid polymer electrolytes have low room temperature ionic conductivity, electrolyte membranes Long-term use stability and other issues, to achieve the effect of improving the ionic conductivity at room temperature, improving the electrochemical window, and improving the lithium ion conductivity

Active Publication Date: 2019-09-13
SHENZHEN BAK POWER BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The Chinese invention patent of CN103500845B discloses a polymer modification method, that is, introducing crosslinking sites by modifying polyethylene oxide, and forming a film by initiating a crosslinking reaction, but the obtained electrolyte still has low room temperature ionic conductivity , The problem of low voltage window
[0008] The Chinese invention patent application of CN109037770A discloses a preparation method of a solid polymer electrolyte by crosslinking polyether monomers and alkene acid monomers, which improves the conductivity and voltage window of the polymer electrolyte to a certain extent, but the preparation process The components involved are complex, and a certain amount of organic additives or (and) inorganic fillers are added, which will affect the long-term stability of the electrolyte membrane
However, the inventors have found in practice that the obtained solid polymer electrolyte still has the problems of low room temperature ionic conductivity and low voltage window.
[0010] It can be seen that although people have conducted extensive research on polymer electrolytes and tried various methods to improve the overall performance of polymer electrolytes, the existing polymer electrolytes still have low electrochemical windows, poor room temperature ionic conductivity, and poor mechanical properties. Poor, poor stability and other problems, so that there is no material that can meet the long-term durability requirements and industrial applications of lithium-ion batteries, and the performance of polymer electrolytes needs to be further improved

Method used

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  • All-solid-state polymer electrolyte with semi-interpenetrating network structure, and preparation method of electrolyte
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  • All-solid-state polymer electrolyte with semi-interpenetrating network structure, and preparation method of electrolyte

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preparation example Construction

[0042] In a second aspect, the present invention also provides a method for preparing the above-mentioned all-solid polymer electrolyte with a semi-interpenetrating network structure, which includes the following steps:

[0043] S1. Add the modified block copolymer, polyether acrylate oligomer monomer and an appropriate amount of solvent into the reactor together, under the protection of nitrogen or argon, and keep stirring for 1h-5h under light-proof conditions to form a uniform Precursor solution

[0044] S2. Add initiator, lithium salt and auxiliary agent to the precursor solution mentioned above, and stir to obtain a mixed solution; pour the mixed solution evenly into glass or a mold, seal it, and initiate the reaction under inert gas;

[0045] S3. After the initiation reaction is completed, vacuum drying is performed.

[0046] In the present invention, the molecular weight of the modified block copolymer is 10,000-1,000,000, such as 10,000, 50,000, 200,000, 500,000, 800,000, 1,00...

Embodiment 1

[0061] The preparation method of all solid polymer electrolyte with semi-interpenetrating network structure, the steps are as follows:

[0062] S1. Add 60 parts of modified block copolymer (molecular weight of 100000), 20 parts of polyethylene glycol diacrylate (molecular weight of 700) and 5ml of acetonitrile into the reactor, continue to vent nitrogen into the reactor, and Stirring continuously at a speed of 300r / min for 5h under dark conditions to form a uniform precursor solution; wherein the structural formula of the modified block copolymer is as follows:

[0063] ,

[0064] Where n: m: l = 93: 6:1, j = 23;

[0065] S2. Add 0.1 parts of azobisisobutyronitrile, 55 parts of lithium bistrifluoromethanesulfonimide and 20 parts of methoxypolyethylene glycol borate to the above precursor solution, and continue at a speed of 300r / min Stir for 5 hours to obtain a mixed solution; pour the mixed solution evenly into a polytetrafluoroethylene mold, seal it, and initiate the reaction unde...

Embodiment 2

[0068] The preparation method of all solid polymer electrolyte with semi-interpenetrating network structure, the steps are as follows:

[0069] S1. Add 95 parts of modified block copolymer (molecular weight of 10000), 50 parts of polyethylene glycol diacrylate (molecular weight of 400) and 6ml of tetrahydrofuran into the reactor, and continue to pass nitrogen into the reactor, and Stirring continuously for 5h at a speed of 100r / min under dark conditions to form a uniform precursor solution; wherein the structural formula of the modified block copolymer is as follows:

[0070]

[0071] Among them, n, m, l ∈ integer, and n ≥ 0, m ≥ 0, l ≥ 0, m and l are not at the same time 0, j ∈ integer, and j> 0;

[0072] S2. Add 1 part of benzophenone, 10 parts of lithium bisoxalate borate and 50 parts of vinyl ethylene carbonate to the above precursor solution, and continue to stir at 300r / min for 12h to obtain a mixed solution; pour the mixed solution evenly The initiation reaction is carried ou...

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Abstract

The invention discloses an all-solid-state polymer electrolyte with a semi-interpenetrating network structure, and a preparation method of the electrolyte. The all-solid-state polymer electrolyte is mainly prepared from the following raw materials in parts by weight: 50-95 parts of a modified block copolymer, 5-50 parts of a polyether acrylate oligomer monomer, a proper amount of a solvent, 0.1-1part of an initiator, 10-60 parts of lithium salt and 0-50 parts of an assistant. The all-solid-state polymer electrolyte is a polyether electrolyte with the semi-interpenetrating network structure; the modified block copolymer is used as a matrix; and the acrylate oligomer monomer containing multi-alkenyl functional groups is introduced to generate a cross-linking polymerization reaction so as toform two polyether semi-interpenetrating network structures. Compared with an existing polymer electrolyte, other inorganic fillers or toughening agents do not need to be doped; the obtained polymerelectrolyte has good mechanical properties; the ionic conductivity at the room temperature is greatly improved; and an electrochemical window is wider, so that the matching of high-voltage electrode materials is facilitated, and a lithium battery with higher energy density is obtained.

Description

Technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an all-solid polymer electrolyte with a semi-interpenetrating network structure and a preparation method thereof. Background technique [0002] Lithium-ion batteries, as an efficient secondary energy storage electrochemical device, have been widely used in consumer electronics, new energy vehicles, stationary energy storage equipment and other fields. Its structure is mainly composed of positive electrode, negative electrode, separator, and electrolyte. At present, most of the commonly commercialized lithium-ion battery electrolytes are liquid and contain a variety of organic solvents. There are potential safety hazards such as leakage and flammability, which reduces their safety performance. As an ideal electrolyte form, the solid electrolyte is recognized as one of the most likely ways to solve the safety problems of lithium batteries. The solid electrolyte includes po...

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 潘星星贺明辉黄科程宋阿敏
Owner SHENZHEN BAK POWER BATTERY CO LTD
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