Polymer electrolyte of high-voltage window

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.

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...

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Problems solved by technology

Patent No. 201010607369.0 provides a polyether chain-containing organic silicon amine electrolyte material with a wide range of applications and its application in lithium batteries. The synthesized polyether chain-containing organic silicon amine electrolyte material has good electrochemical properties; poor mechanical properties , Dimensional performance is unstable, and there is a risk of electrolyte side leakage

Patent No. CN 109802174A discloses a polycarbonate-based polymer electrolyte with an ion conductivity of >10 at room temperature -3 S cm -1 , the electrochemical window is only 4.7V, which cannot be applied to LiNi 0.5 mn 1.5 o 4 Equal high voltage cathode material

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