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 the problems of non-controllability, poor cycle performance, unavoidable side reactions, etc.

Active Publication Date: 2020-03-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 ...

Method used

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  • Ternary lithium ion battery and preparation method thereof
  • Ternary lithium ion battery and preparation method thereof
  • Ternary lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
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 invention relates to the technical field of ternary lithium ion secondary batteries, and particularly discloses a ternary lithium ion battery electrolyte which comprises a functional additive, a solvent and inorganic conductive lithium salt, wherein the functional additive. The invention further discloses an application of the electrolyte containing the functional additive. In the invention, the functional additive is added into the electrolyte. Serving as a film-forming additive, the functional additive can form a layer of uniform and compact coating film on the surface of the positive electrode of the lithium ion battery, so that the oxidative decomposition of an electrolyte solvent and the corrosion of an electrolyte and lithium salt decomposition product HF to an electrode materialare inhibited, the structure of the positive electrode material is stabilized, the dissolution of transition metal ions is inhibited, and the cycling stability and the rate performance of the lithiumion battery at high voltage and high temperature are improved.

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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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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