Preparation method and application of self-assembled core-shell structure positive electrode material

A core-shell structure and cathode material technology, applied in the field of nanomaterials, can solve the problems of overheating of cathode materials, material decomposition out of control, battery fire, etc., to achieve the effects of sufficient reaction, high yield and improved conductivity

Inactive Publication Date: 2022-02-18
TIANJIN B&M SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The electrification of traditional fuel vehicles has increasingly stringent requirements on the mileage, fast charging and safety of lithium-ion secondary batteries. At present, the high-power and high-current fast charging of lithium-ion secondary battery cathode materials can easily cause the cathode material to overheat and decompose out of control, resulting in Safety factors such as battery fire and explosion
[0003] In the prior art, in order to improve battery performance, lithium-ion positive electrode materials are doped, but similar positive electrode materials on the market cannot fully meet the demand

Method used

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  • Preparation method and application of self-assembled core-shell structure positive electrode material
  • Preparation method and application of self-assembled core-shell structure positive electrode material
  • Preparation method and application of self-assembled core-shell structure positive electrode material

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preparation example Construction

[0068] A method for preparing a self-assembled core-shell structure positive electrode material, comprising the steps of:

[0069] (1) Preparation of doped nickel-cobalt-manganese core precursor P1:

[0070] Add nickel salt, cobalt salt, manganese salt and other metal salts into the aqueous solution, pass in protective gas, then stir and adjust the pH value of the solution, filter and dry the solution after the reaction, and obtain the doped nickel-cobalt-manganese core precursor P1 ;

[0071] (2) Preparation of P1 surface-modified self-assembled monolayer core precursor L1:

[0072] Add the doped nickel-cobalt-manganese core precursor P1 obtained in step (1) into the mixed solution, add polar amphiphilic molecules into the mixed solution, then stir and adjust the pH value of the solution, and filter and dry the solution after the reaction , and sieve to obtain the P1 surface-modified self-installed single-layer membrane core precursor L1;

[0073] (3) Preparation of doped ...

Embodiment 1

[0082] A method for preparing a self-assembled core-shell structure positive electrode material, comprising the steps of:

[0083] (1) Preparation of doped nickel-cobalt-manganese core precursor P1:

[0084] Nickel sulfate, cobalt sulfate, manganese sulfate and aluminum sulfate prepare mixed salt solution (1.5mol / L) in molar ratio 65:7:18:0.03, mix solution with 4mol / L NaOH solution and the ammoniacal solution of certain concentration (12wt% ) into the reactor in parallel flow, filled with nitrogen in the reactor, controlling the temperature in the reactor to be 42°C, controlling the pH value in the reactor at 10.0-13.0, starting the stirring device in the reactor, the stirring device The stirring speed is 1000rpm / min, and the reaction product obtained by the reaction is aged for 5 hours, press-filtered, washed, and dried to obtain the product P1 with a D50 of 3.53 microns, and the particle size distribution of P1 is as follows figure 2 As shown, the SEM image of P1 is as ...

Embodiment 2

[0101] The difference from Example 1 is: in the step (2), the colorless liquid hydrophilic ionic liquid is 1-butyl-3-methylimidazole dinitrile amine salt (C 10 h 15 N 5 ).

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Abstract

The invention provides a preparation method of a self-assembled core-shell structure positive electrode material. The preparation method comprises the following steps: (1) preparing a doped nickel-cobalt-manganese core precursor P1; (2) preparing a P1 surface modified self-assembled single-layer film inner core precursor L1; (3) preparing a doped nickel-cobalt-manganese core-shell structure precursor P2; (4) preparing a doped nickel-cobalt-manganese core-shell structure positive electrode material C1; (5) preparing a C1 surface modified self-assembled single-layer film precursor L2; (6) preparing the oxide-coated nickel-cobalt-manganese-doped core-shell structure positive electrode material C2. According to the self-assembly core-shell structure positive electrode material, molecular self-assembly is formed by adopting polar and non-polar solvents, in the non-polar solvent, amphiphilic molecules and polar hydrophilic groups of an organic metal compound are adsorbed on the surfaces of a precursor and positive electrode material particles, non-polar hydrophobic groups are dissolved in the non-polar solvent, the solvents are evaporated, and a compact monomolecular self-assembly layer is formed on the surfaces of the precursor and the positive electrode material particles.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a preparation method and application of a self-assembled core-shell structure cathode material. Background technique [0002] The electrification of traditional fuel vehicles has increasingly stringent requirements on the mileage, fast charging and safety of lithium-ion secondary batteries. At present, the high-power and high-current fast charging of lithium-ion secondary battery cathode materials can easily cause the cathode material to overheat, and the material decomposition is out of control, resulting in Safety factors such as battery fire and explosion. [0003] In the prior art, in order to improve battery performance, lithium-ion positive electrode materials are doped, but similar positive electrode materials on the market cannot fully meet the demand. Contents of the invention [0004] In view of this, the present invention aims to overcome the defects i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/364H01M4/525H01M4/505Y02E60/10
Inventor 徐士民吕菲李磊徐宁吴孟涛
Owner TIANJIN B&M SCI & TECH
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