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Polymer electrolyte membrane, preparation method thereof and battery
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An electrolyte membrane and polymer technology, applied in secondary batteries, circuits, electrical components, etc., can solve the problems of high battery interface impedance, low ionic conductivity, affecting battery cycle performance, etc., to achieve improved ionic conductivity and improved dispersion. Compatibility, the effect of improving compatibility
Pending Publication Date: 2022-04-15
佛山(华南)新材料研究院
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Description
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Problems solved by technology
[0004] However, polymer solid electrolytes have poor compatibility with inorganic oxides, resulting in uneven dispersion of inorganic oxides in the polymer, resulting in poor mechanical strength of the electrolyte membrane and low ionic conductivity.
Poor contact with the positive and negative electrodes leads to a large interface impedance of the battery, which seriously affects the cycle performance of the battery at room temperature and low temperature
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[0033] In order to solve the above problems, the invention provides a method for preparing a polymer electrolyte membrane, comprising the following steps:
[0034] S1. Dissolving the first polymer and lithium salt in an organic solvent to obtain a first mixed solution;
[0035] S2. Adding a first polymerized monomer and an initiator to the first mixed solution to obtain a second mixed solution;
[0036] S3, adding inorganic oxides to the second mixed solution, and dispersing them uniformly to obtain a polymer electrolyte slurry;
[0037] S4. Coating the polymer electrolyte slurry on a substrate to obtain a polymer electrolyte wet film;
[0038] S5. The polymer electrolyte wet film is dried to obtain a finished product;
[0039] The raw materials used to prepare the polymer electrolyte membrane include by weight: 1-15 parts of the first polymer, 30-70 parts of organic solvent, 0.5-5 parts of lithium salt, 0.1-5 parts of the first polymerized monomer, 0.05-2 parts of initiato...
Embodiment 1
[0055] A method for preparing a polymer electrolyte membrane, comprising the steps of:
[0056] S1. Weigh 5g PVDF and 2g LiTFSI and dissolve them in 50g NMP to obtain the first mixed solution;
[0057] S2. Add 1 g of MAH and 0.1 g of DCP to the first mixed solution to obtain a second mixed solution;
[0058] S3, adding 2gAl to the second mixed solution 2 o 3 , to obtain polymer electrolyte slurry after dispersion;
[0059] S4. Coating the polymer electrolyte slurry on a substrate to obtain a polymer electrolyte wet film;
[0060] S5. The polymer electrolyte wet membrane is dried at 60° C. for 24 hours to obtain a finished product.
Embodiment 2
[0062] A method for preparing a polymer electrolyte membrane, comprising the steps of:
[0063] S1. Weigh 5g PVDF-HFP and 2g LiTFSI and dissolve them in 60g NMP to obtain the first mixed solution;
[0064] S2. Add 1 g of MAH and 0.1 g of DCP to the first mixed solution to obtain a second mixed solution;
[0065] S3, adding 2gAl to the second mixed solution 2 o 3 , to obtain polymer electrolyte slurry after dispersion;
[0066] S4. Coating the polymer electrolyte slurry on a substrate to obtain a polymer electrolyte wet film;
[0067] S5. The polymer electrolyte wet membrane is dried at 60° C. for 24 hours to obtain a finished product.
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Abstract
The invention discloses a preparation method of a polymerelectrolyte membrane, which comprises the following steps: dissolving a first polymer and a lithium salt in an organic solvent to obtain a first mixed solution; adding a first polymeric monomer and an initiator into the first mixed solution to obtain a second mixed solution; adding an inorganic oxide into the second mixed solution, and uniformly dispersing to obtain polymerelectrolyteslurry; coating a base material with the polymer electrolyteslurry to obtain a polymer electrolyte wet film; and drying the polymer electrolyte wet film to obtain a finished product. The polymer electrolyte membrane is prepared from the following raw materials in parts by weight: 1-15 parts of a first polymer, 30-70 parts of an organic solvent, 0.5-5 parts of lithium salt, 0.1-5 parts of a first polymeric monomer, 0.05-2 parts of an initiator and 0.5-5 parts of inorganic oxide. Correspondingly, the invention also provides the polymer electrolyte membrane prepared by the method, and the polymer electrolyte membrane has good mechanical strength and good interfacial compatibility.
Description
technical field [0001] The invention relates to the technical field of lithiumion batteries, in particular to a polymer electrolyte membrane, a preparation method thereof and a battery. Background technique [0002] In order to meet the growing demand for lithium batteries in consumerelectronics and electric vehicles, all-solid-state lithium batteries have attracted extensive attention in recent years due to their superior safety and ultra-high energy density. Conventional lithium batteries containing organic liquid electrolytes exhibit serious safety issues of toxicity, flammability, corrosion, and poor chemical stability. The use of solid electrolytes to replace the electrolyte and diaphragm can fundamentally eliminate the above safety problems. All solid-state lithium batteries are divided into three categories according to the type of solid electrolyte: polymer, oxide and sulfide. At present, due to the low ionic conductivity and large interface resistance of all-sol...
Claims
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Application Information
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