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

Active Publication Date: 2020-05-08
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Achieving high energy density of the battery by increasing the charging depth of the positive electrode active material and increasing the upper limit voltage of the battery will bring many problems, such as electrolyte decomposition, material lattice collapse, transition metal dissolution, SEI film damage, etc. These problems will lead to Battery performance deteriorates and can cause safety concerns

Method used

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  • Thienyl-containing phosphite compound and application thereof
  • Thienyl-containing phosphite compound and application thereof
  • Thienyl-containing phosphite compound and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: Preparation of thienyl-containing phosphite compound A tris (2-(thiophen-2-yl) ethyl) phosphite (TTEPi)

[0037] Compound A phosphite tris (2-(thiophen-2-yl) ethyl) ester (TTEPi) is shown in formula (II):

[0038]

[0039] The specific reaction principle is as follows:

[0040]

[0041] Concrete preparation steps are:

[0042] (1) Raw material pretreatment: THF is heated and distilled, and at the same time, it is dried with sodium metal to remove water, so that the purity of THF is greater than 99.9%, and the water content is reduced to below 50ppm. Triethylamine is heated and fractionated to obtain a colorless and transparent triethylamine solution, and then activated 4A molecular sieves are added to make the triethylamine moisture lower than 50ppm. 2-thiophene ethanol and phosphorus trichloride are respectively added to the activated 4A molecular sieve, so that the moisture in the 2-thiophene ethanol and phosphorus trichloride is lower than 50ppm...

Embodiment 2

[0048] Example 2: Preparation of thienyl-containing phosphite compound B propyl bis (2-(thiophen-2-yl) ethyl) phosphite (PBTEPi)

[0049] Compound B propyl bis (2-(thiophen-2-yl) ethyl) phosphite (PBTEPi) is shown in formula (III):

[0050]

[0051] The specific reaction principle is as follows:

[0052]

[0053] Concrete preparation steps are:

[0054] (1) Raw material pretreatment: THF is heated and distilled, and at the same time, it is dried with sodium metal to remove water, so that the purity of THF is greater than 99.9%, and the water content is reduced to below 50ppm. Triethylamine is heated and fractionated to obtain a colorless and transparent triethylamine solution, and then activated 4A molecular sieves are added to make the triethylamine moisture lower than 50ppm. 2-thiophene ethanol, propanol, and phosphorus trichloride are respectively added to activated 4A molecular sieves, so that the moisture in 2-thiophene ethanol, propanol, and phosphorus trichlorid...

Embodiment 3

[0060] Example 3: Preparation of thienyl-containing phosphite compound C ethylpropyl (2-(thiophen-2-yl) ethyl) phosphite (EPBTEPi)

[0061] Compound C ethylpropyl (2-(thiophen-2-yl) ethyl) phosphite (EPBTEPi) is shown in formula (IV):

[0062]

[0063] The specific reaction principle is as follows:

[0064]

[0065] Concrete preparation steps are:

[0066] (1) Raw material pretreatment: THF is heated and distilled, and at the same time, it is dried with sodium metal to remove water, so that the purity of THF is greater than 99.9%, and the water content is reduced to below 50ppm. Triethylamine is heated and fractionated to obtain a colorless and transparent triethylamine solution, and then activated 4A molecular sieves are added to make the triethylamine moisture lower than 50ppm. Add activated 4A molecular sieves to 2-thiophene ethanol, propanol, ethanol, and phosphorus trichloride before use, so that the moisture in 2-thiophene ethanol, propanol, ethanol, and phosphor...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6553H01M10/0525H01M10/0568
CPCC07F9/655345H01M10/0525H01M10/0568Y02E60/10
Inventor 黄建李立飞高田慧张振宇
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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