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Graphene-loaded multi-metal oxide-coated positive electrode material as well as preparation method and application thereof

A technology of multi-metal oxides and positive electrode materials, which is applied in the field of materials, can solve the problems of weak interaction between graphene and positive electrode materials, powdering and falling off, weakening the electrochemical stability of positive electrode materials, etc., to improve capacity stability and improve Conductivity and effect of improving Coulombic efficiency

Active Publication Date: 2021-04-09
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

With this method, the interaction between graphene and the positive electrode material is not strong, and after contacting the electrolyte, it is prone to powdering and falling off during the charge-discharge cycle, which greatly weakens the electrochemical stability of the positive electrode material.

Method used

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  • Graphene-loaded multi-metal oxide-coated positive electrode material as well as preparation method and application thereof
  • Graphene-loaded multi-metal oxide-coated positive electrode material as well as preparation method and application thereof
  • Graphene-loaded multi-metal oxide-coated positive electrode material as well as preparation method and application thereof

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preparation example Construction

[0042] Main preparation method flow process step of the present invention comprises:

[0043] Step 110, adding an organic metal salt containing hydrogen bonds to an alkaline solution containing graphene, and performing a hydrothermal reaction or a solvothermal reaction or a mixed solvothermal reaction to obtain a graphene polymetallic hydroxide;

[0044] Specifically, the reaction temperature of hydrothermal reaction, solvothermal reaction or mixed solvothermal reaction is 100°C-250°C, the reaction time is 5 hours-15 hours, and the drying temperature is 60°C-120°C. The solvent for hydrothermal reaction is water; the solvent for solvothermal reaction includes methanol, dimethylformamide, ethanol, acetonitrile, acetone, ethyl acetate, isopropanol, tetrahydrofuran, propanol, n-butanol, n-propanol, isopropanol, One or more of propanol; the mixed solvent in the mixed solvent thermal reaction includes water and the above solvents, wherein the volume ratio of water to solvent is betw...

Embodiment 1

[0075] Step 1), take corresponding amount of nickel acetate and cobalt acetate tetrahydrate by 1:1 metal molar ratio and be mixed with total concentration and be 2mol L -1 aqueous solution, magnetically stirred for 30mins. Add urea to the above mixed solution to adjust the pH value to 10. Afterwards, a certain mass of graphene powder was added to the mixed solution so that the content of graphene in the solution was 2g / L, and magnetically stirred for 30mins again to obtain a uniformly stirred mixed solution.

[0076] In step 2), the mixed solution was transferred to a 100ml reaction kettle, placed in an oven at 120°C, and reacted for 12 hours. After the product was cooled to room temperature, it was washed several times with deionized water and absolute ethanol, and then dried at 80 °C for 6 hours to obtain graphene-nickel-cobalt hydroxide.

[0077] Step 3), the graphene nickel-cobalt hydroxide and lithium-rich manganese-based positive electrode material Li (Li 0.2 Ni 0.13...

Embodiment 2

[0079] Change the amount of graphene in embodiment 1 step 1) so that the content of graphene in the solution becomes 1g / L, other steps are the same as in embodiment 1, and the final product obtained is graphene-supported nickel-cobalt-oxygen-coated lithium-rich manganese base Cathode material II.

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Abstract

The invention relates to a graphene-loaded multi-metal oxide-coated positive electrode material as well as a preparation method and application thereof. The preparation method comprises the steps that organic metal salt containing hydrogen bonds is added into an alkaline solution containing graphene, and graphene multi-metal hydroxide is obtained through a hydrothermal reaction or a solvothermal reaction or a mixed solvothermal reaction, wherein the organic metal salt specifically comprises at least two of a nickel source, a cobalt source, a manganese source, an aluminum source, an iron source and a magnesium source, the solvent of the hydrothermal reaction is water, a solvent of the solvothermal reaction comprises one or more of methanol, dimethylformamide, ethanol, acetonitrile, acetone, ethyl acetate, isopropanol, tetrahydrofuran, propanol, n-butyl alcohol, n-propanol and isopropanol, and a mixed solvent in the mixed solvothermal reaction comprises water and the solvent, and the volume ratio of the water to the solvent is 1:0.5 to 1:3; and the graphene multi-metal hydroxide and a positive electrode material are mixed for coating, and calcining is conducted to form the graphene-loaded multi-metal oxide-coated positive electrode material.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a graphene-supported multi-metal oxide-coated positive electrode material, a preparation method and an application. Background technique [0002] Lithium-ion battery materials such as nickel-cobalt-manganese ternary materials, LiCoO 2 , LiNiO 2 , LiMn 2 o 4 and lithium-rich manganese base have attracted much attention as a new type of high-energy green battery cathode material, but there are still some problems with this material, such as the electrolyte has a certain corrosion effect on the electrode material, which makes the capacity of the material decay and affects the cycle of the material. stability. Therefore, the modification of cathode materials has become an important means to improve the electrochemical performance of materials, and coating is the most simple and effective method. [0003] The existence of the coating layer can maintain the stability of its own ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00C01B32/194H01M4/62H01M10/0525
CPCC01G53/44C01G53/00C01B32/194H01M4/62H01M4/625H01M10/0525C01P2004/80C01P2006/40Y02E60/10
Inventor 刘园园许国干吕焱周子龙任瑜郑杰允李立飞
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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