Polymer electrolyte of high-voltage window

A polymer and high-voltage technology, applied in organic electrolytes, non-aqueous electrolytes, circuits, etc., can solve problems such as side leakage of electrolyte, unstable size and performance, and inapplicability

CN110690500AInactive Publication Date: 2020-01-14BEIJING UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2020-01-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses polymer electrolyte of a high-voltage window, and relates to the field of lithium ion battery electrolyte. A hydrogen-containing organosilicon compound is used as a main chain,and ethylene carbonate is used as a side chain, a conductive lithium salt, an organic solvent and an initiator. Graft polymerization is performed through adoption of a chemical method, the construction of the hydrogen-containing organosilicon compound used as the main chain can be used as a skeleton, so that the electrochemical stability window, mechanical properties and thermal stability of thepolymer electrolyte are improved, and an ion channel can also be provided; the side-chain ethylene carbonate is used as a main ion channel of the polymer electrolyte, so that the ionic conductivity and the ionic migration number of the polymer electrolyte are improved, the interfacial compatibility of the polymer electrolyte and an electrode material is improved, and the charge-discharge performance of the solid-state lithium ion battery is improved.
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Description

technical field

[0001] The invention relates to the field of lithium-ion battery electrolytes, in particular to a novel high-voltage window polymer electrolyte. Background technique

[0002] Lithium-ion batteries are more and more widely used in electric vehicles and mobile electronic devices due to their advantages of high energy density, fast charging and portability, and can realize the zero carbon emission plan. However, traditional lithium-ion battery separators generally use polyolefin polymers (polypropylene (PP)) by adding liquid electrolytes (lithium hexafluorophosphate + ethylene carbonate / propylene carbonate), but this type of polymer separator has poor wettability to the electrolyte. , High pressure is easy to decompose and produce gas, causing liquid side leakage. In addition, using lithium metal as the negative electrode, lithium dendrites will be formed on the surface of lithium metal as lithium ions are continuously intercalated and extracted. The formation...

Examples

Embodiment 1

[0032] 1.3g ethylene carbonate, 1.5g phenyl hydrogen-containing silicone oil, 0.65g lithium bistrifluoromethanesulfonylimide (LiTFSI) lithium perchlorate (LiClO 4 ) into 4ml of acetonitrile, stirred at room temperature to dissolve completely; add 0.015g of azobisisobutyronitrile and stir evenly, and evenly coat it on the polytetrafluoroethylene mold cavity; heat at 90°C in a vacuum oven for 12 hours to solidify and form a film .

Embodiment 2

[0034] 2g ethylene carbonate, 2g methyl hydrogen silicone resin, 0.8g lithium perchlorate (LiClO 4 ) into 4ml of NMP, stirred at room temperature to dissolve completely; add 0.02g of bis(acetylacetonate) dibutyltin and stir evenly, and evenly apply to the polytetrafluoroethylene mold cavity; heat at 90°C in a vacuum oven for 12 hours to cure film forming.

Embodiment 3

[0036] Dissolve 1.8g of ethylene carbonate, 2g of methyl hydrogen-containing silicone resin, and 0.7g of lithium bistrifluoromethanesulfonimide (LiTFSI) into 4ml of tetrahydrofuran, stir at room temperature to dissolve completely; add 0.02g of platinum catalyst Stir evenly, and evenly apply to the polytetrafluoroethylene mold cavity; heat at 90°C in a vacuum oven for 12 hours to solidify and form a film.