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A kind of ternary lithium ion battery and preparation method thereof

A lithium-ion battery and battery technology, applied in the field of lithium-ion batteries, can solve problems such as poor cycle performance, unavoidable side reactions, and uncontrollable problems, and achieve the effects of reducing impedance, inhibiting irreversible attenuation of capacity, and inhibiting corrosion

Active Publication Date: 2021-04-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problems of poor cycle performance, especially high temperature and high pressure cycle performance caused by uncontrollable and unavoidable side reactions in most of the existing technologies, the present invention provides a preparation method of a ternary lithium ion battery , aims to achieve controllable film morphology and structure through artificial structure and regulation, and avoid side reactions, so as to improve the electrical performance of ternary lithium-ion batteries, especially at high voltage or high temperature.

Method used

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  • A kind of ternary lithium ion battery and preparation method thereof
  • A kind of ternary lithium ion battery and preparation method thereof
  • A kind of ternary lithium ion battery and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0069] (1) Configure cyclic carbonate (EC) and linear carbonate diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in a mass ratio of 1:1:1, add 1 mol / L lithium salt lithium hexafluorophosphate, add Film-forming additive triisopropyl borate (addition is 1wt%), obtains the electrolytic solution containing film-forming additive;

[0070] (2) Add the electrolyte described in (1) into the ternary NCM622 half-cell to assemble the battery (use the existing assembly method to assemble into a half-cell, the assembly sequence is, for example: positive electrode case, positive electrode sheet (including positive electrode material and Positive electrode current collector), electrolyte diaphragm, electrolyte, lithium sheet, negative electrode current collector, the assembly process is carried out in a glove box, and the diaphragm is a polypropylene diaphragm;

[0071] (3) Put the battery in the blue electric test system, set the current density to 0.1C, cycle 5 times, take out the ...

Embodiment 2

[0074] (1) Configure cyclic carbonate (EC) and linear carbonate diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in a mass ratio of 1:1:1, add 1 mol / L lithium salt lithium hexafluorophosphate, add Film-forming additive triisopropyl phosphite (addition is 1wt%), obtains the electrolytic solution containing film-forming additive;

[0075] (2) Add the electrolyte described in (1) into the ternary NCM523 half-cell to assemble the battery (refer to Example 1 for the assembly method);

[0076] (3) Put the battery in the blue electric test system, set the current density to 0.1C, cycle 5 times, take out the positive electrode after the cycle, and complete the pretreatment in the glove box;

[0077] (4) Assemble the battery with the positive electrode sheet obtained in step (3), and use cyclic carbonate (EC) and linear carbonate diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) (1:1:1, mass ratio ), the concentration of the lithium salt lithium hexafluorophosphate is 1...

Embodiment 3

[0079] (1) Configure cyclic carbonate (EC) and linear carbonate diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) in a mass ratio of 1:1:1, add 1mol / L lithium salt lithium hexafluorophosphate, and add Membrane additive triisopropyl phosphite and triisopropyl borate (mass ratio is 1: 1, total addition is 1wt%), obtains the electrolytic solution containing film-forming additive;

[0080] (2) Add the electrolyte described in (1) into the ternary NCM622 half-cell to assemble the battery (refer to Example 1 for the assembly method);

[0081] (3) Put the battery in the blue electric test system, set the current density to 0.1C, cycle 5 times, take out the positive electrode after the cycle, and complete the pretreatment in the glove box;

[0082] (4) Assemble the battery with the positive electrode sheet obtained in step (3), and use cyclic carbonate (EC) and linear carbonate diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) (1:1:1, mass ratio ), the concentration of ...

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Abstract

The technical field of the ternary lithium ion secondary battery of the present invention specifically discloses the electrolyte solution of the ternary lithium ion battery, which includes a functional additive, a solvent and an inorganic conductive lithium salt; the functional additive. The invention also discloses the application of the electrolyte solution containing functional additions. In the present invention, adding the functional additive in the electrolyte, as a film-forming additive, can form a layer of uniform and dense coating film on the surface of the positive electrode of the lithium-ion battery, inhibiting the oxidative decomposition of the electrolyte solvent and The electrolyte and lithium salt decomposition product HF corrode the electrode material, stabilize the structure of the positive electrode material, inhibit the dissolution of transition metal ions, and improve the cycle stability and rate performance of lithium-ion batteries at high voltage and high temperature.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries; in particular, it relates to a method for equipping a ternary lithium ion battery. Background technique [0002] The energy problem is a huge problem faced in the 21st century. Under the background of the energy crisis, various new energy materials and devices have been developed to a great extent, and have also received the focus of the research field. Especially since the advent of new chemical power lithium-ion batteries in the 1980s, especially in the process of Sony's large-scale commercialization of lithium-ion batteries in the 1990s, lithium-ion batteries, as the third generation of rechargeable batteries, have a large specific energy. , good cycle performance, high working voltage, long life and low pollution have attracted much attention, and are widely used in electric energy storage devices, mobile electronic devices, hybrid vehicles and pure electric vehicles. Battery materials h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 洪波赖延清覃昭铭范海林张治安张凯方静
Owner CENT SOUTH UNIV
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