Thienyl-containing phosphite compound and application thereof

A phosphite and compound technology, applied in the field of chemical synthesis, can solve the problems of SEI film damage, material lattice collapse, deterioration of battery performance, etc., and achieve the effects of inhibiting dissolution, high yield and low cost
CN111116651AActive Publication Date: 2020-05-08TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
Publication Date
2020-05-08

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Abstract

The invention relates to a thienyl-containing phosphite compound and an application thereof in a lithium ion battery electrolyte. The phosphite compound at least comprises one thiophene alkoxy C4H3(C2H4)nOS<->. The synthesis process of the phosphite compound is simple. The thienyl-containing phosphite compound is used for preparing a lithium ion battery electrolyte. Thienyl in the compound has thecharacteristic of being polymerized into a film at a positive electrode, trivalent P can react with O2 and HF in a battery to form a CEI film at the positive electrode, the formed polymer film contains a P element which is beneficial to the low-temperature performance of the battery, and the formed polymer film contains an S element which is beneficial to the high-temperature performance and thelow-temperature performance of the battery. The polymer film can stabilize the electrode structure, inhibit the dissolution of a transition metal, reduce the side reaction between the positive electrode and the electrolyte interface, and improve the electrochemical performance and safety performance of the battery.
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Description

technical field

[0001] The invention relates to the field of chemical synthesis, in particular to a thienyl-containing phosphite compound and its application in lithium-ion battery electrolytes. Background technique

[0002] Due to its high energy density, high voltage, long life, no memory effect, and no pollution, lithium-ion batteries are widely used in portable electronic product markets such as mobile phones, digital cameras, and personal computers, and are widely used in electric vehicles and hybrid vehicles. Broader development. With the advancement of technology and the continuous development of the market, it is increasingly important and urgent to increase the energy density of lithium batteries. The way to increase energy density can be realized by using high specific capacity materials or high voltage cathode materials.

[0003] Achieving high energy density of the battery by increasing the charging depth of the positive electrode active material and increasing ...

Claims

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