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Polymer-coated lithium battery positive electrode material and preparation method thereof

A battery positive electrode and positive electrode material technology, applied in the direction of battery electrodes, active material electrodes, positive electrodes, etc., can solve the problem of not allowed

Active Publication Date: 2021-05-18
SHENZHEN DYNANONIC INNOVAZONE NEW ENERGY TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But for lithium ferrite, water and carbon dioxide are not allowed to exist in the coating process

Method used

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  • Polymer-coated lithium battery positive electrode material and preparation method thereof
  • Polymer-coated lithium battery positive electrode material and preparation method thereof
  • Polymer-coated lithium battery positive electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] This embodiment provides a method for preparing PVDF-coated lithium ferrite, the specific steps are as follows:

[0047] (1) Get 1.0g PVDF and dissolve it in 99.0g N-methylpyrrolidone to prepare a 1wt% PVDF solution;

[0048] (2) Take 5.0g lithium ferrite (Li 5 FeO 4 ) was slowly added to the above PVDF solution, and then placed in a high-pressure reactor, the temperature was adjusted to 150° C., the pressure was 5 MPa, and the reaction was carried out for 10 hours, so that PVDF was coated on the surface of lithium ferrite, and filtered to obtain a filter residue;

[0049] (3) Heat the filter residue obtained in step (2) to 200° C. at a heating rate of 10° C. / min under a nitrogen atmosphere, and heat-preserve and sinter for 10 hours to obtain PVDF-coated lithium ferrite.

[0050] According to the mass change before and after the lithium ferrite coating, the content of the PVDF coating layer in the PVDF coated lithium ferrite is 5.49wt%.

[0051] Scanning electron mic...

Embodiment 2

[0053] This embodiment provides a preparation method of starch-coated lithium ferrite, the specific steps are as follows:

[0054] (1) get 0.1g starch and dissolve in 99.9g ethanol, be mixed with the starch solution of 0.1wt%;

[0055] (2) Take 1.0g lithium ferrite (Li 5 FeO 4 ) was slowly added to the above starch solution, and then placed in a high-pressure reactor, the temperature was adjusted to 60° C., the pressure was 1 MPa, and the reaction was carried out for 20 hours, so that the starch was coated on the surface of lithium ferrite, and filtered to obtain a filter residue;

[0056] (3) Heat the filter residue obtained in step (2) to 300° C. at a heating rate of 20° C. / min under a nitrogen atmosphere, and heat-preserve and sinter for 5 hours to obtain starch-coated lithium ferrite.

[0057] According to the mass change before and after coating the lithium ferrite, the content of the starch coating layer in the starch-coated lithium ferrite is 1.36wt%.

Embodiment 3

[0059] This embodiment provides a preparation method of PVP-coated lithium ferrite, the specific steps are as follows:

[0060] (1) Get 20.0g PVP and be dissolved in 80.0g N-methylpyrrolidone, be mixed with the PVP solution of 20wt%;

[0061] (2) Take 20.0g lithium ferrite (Li 5 FeO 4 ) was slowly added to the above PVP solution, and then placed in a high-pressure reactor, the temperature was adjusted to 200 ° C, the pressure was 14 MPa, and the reaction was carried out for 6 hours, so that the PVP was coated on the surface of lithium ferrite, and filtered to obtain a filter residue;

[0062] (3) Heat the filter residue obtained in step (2) to 80° C. at a heating rate of 1° C. / min under a nitrogen atmosphere, and heat-preserve and sinter for 20 hours to obtain PVP-coated lithium ferrite.

[0063] The content of the PVP coating layer in the PVP-coated lithium ferrite was calculated to be 14.37wt% according to the mass change before and after coating the lithium ferrite.

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Abstract

The invention provides a polymer-coated lithium battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: a lithium battery positive electrode material and a polymer solution are uniformly mixed, and a solvent of the polymer solution is an organic solvent; heating and pressurizing reaction is carried out, so that the surface of the lithium battery positive electrode material is coated with the polymer, solid-liquid separation is carried out, an obtained solid is sintered in an inert atmosphere at 80-300 DEG C, and the polymer-coated lithium battery positive electrode material is obtained. According to the preparation method provided by the invention, the lithium battery positive electrode material is not in contact with water and carbon dioxide in the whole process, and a carbonization layer is not formed finally, so that compared with the existing high-temperature carbon coating, the preparation method provided by the invention is beneficial to ensuring the stability of lithium ferrite and other lithium battery positive electrode materials which are easy to react with water and carbon dioxide and are easy to reduce, and the energy consumption is lower.

Description

technical field [0001] The invention belongs to the technical field of lithium battery cathode materials, and in particular relates to a polymer-coated lithium battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of energy storage technology, the use of portable digital devices and vehicle-mounted power supplies is increasing, and people have higher and higher requirements for the energy density of batteries. It is imperative to develop secondary batteries with large capacity, long life and high safety. Row. [0003] During the first charge and discharge process of lithium-ion batteries, an SEI film will be formed at the interface of the negative electrode material. Studies have shown that the main components of SEI are LiF, Li 2 CO 3 , R-COOLi, R-CH 2 Lithium salt materials such as OLi. The formation of SEI is an irreversible process, the Li used to form SEI + It can no longer be embedded in the cathode mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/58H01M4/60H01M10/0525H01M10/42
CPCH01M4/525H01M4/5825H01M4/602H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 赵中可万远鑫孔令涌任望保
Owner SHENZHEN DYNANONIC INNOVAZONE NEW ENERGY TECH CO LTD
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