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Lithium ion battery material and preparation method thereof by adopting super-assembly and dealloying

A lithium-ion battery and dealloying technology, applied in nanotechnology for materials and surface science, battery electrodes, secondary batteries, etc., can solve the problems of low performance, poor controllability, and complexity of lithium-ion batteries, and achieve Suitable for large-scale production, controllable composition and structure, and improved electrochemical performance

Active Publication Date: 2021-11-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the current research on the preparation of nano-Co 3 o 4 There are many methods for battery anode materials with NiO, but these methods are usually complicated, poor controllability, and the prepared Co 3 o 4 Lithium-ion battery performance with NiO is not high

Method used

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  • Lithium ion battery material and preparation method thereof by adopting super-assembly and dealloying
  • Lithium ion battery material and preparation method thereof by adopting super-assembly and dealloying
  • Lithium ion battery material and preparation method thereof by adopting super-assembly and dealloying

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Step S1, the 1gCo 5 Ni 15 Al 80 The alloy sheet was placed in 10mL hydrogen peroxide solution (3M), 100mL sodium hydroxide solution (2M) was added, magnetically stirred at a rotation speed of 2000rpm, and freely corroded at room temperature 25°C for 8h to obtain corroded dealloyed materials.

[0045] In step S2, take 0.2 g of the corroded dealloyed material, place it in 50 mL of ethanol and sonicate for 30 min, add 1 mL of aminopropyltrimethoxysilane, stir for 1 h after sonicating for 30 min, centrifuge, and wash with ultrapure water for 3 times to obtain a precursor.

[0046] Step S3, using the hummers method to prepare graphene oxide powder, taking 20 mg of graphene oxide and adding 40 mL of ultrapure water to ultrasonic for 1 hour to prepare a graphene oxide dispersion. Mix the precursor obtained in step S2 with the graphene oxide solution, and magnetically stir for 1 h at 25° C. at a rotational speed of 2000 rpm to obtain a mixed solution.

[0047] Step S4, add 5...

Embodiment 2

[0059] On the basis of embodiment 1, the difference is:

[0060] In step S1, free etching was carried out at room temperature of 25° C. for 2 hours.

Embodiment 3

[0062] On the basis of embodiment 1, the difference is:

[0063] In step S1, free etching was carried out at room temperature of 25° C. for 12 hours.

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Abstract

The invention belongs to the technical field of lithium battery materials, and provides a lithium ion battery material and a preparation method thereof by adopting super-assembly and dealloying, the preparation method comprises the following steps: placing a ternary alloy containing metals Al, Co and Ni in a hydrogen peroxide solution, adding a strong alkali solution, and carrying out a dealloying reaction; then adding aminopropyl trimethoxy silane, and carrying out ultrasonic treatment for a period of time to obtain a precursor; preparing graphene oxide powder into graphene oxide dispersion liquid, mixing the graphene oxide dispersion liquid with the precursor according to a certain mass ratio, and then adding ammonia water and citric acid to obtain a material intermediate; and finally, heating the material intermediate to a certain temperature in a preset atmosphere, conducting heat preservation for a certain time, then cooling the material intermediate to the room temperature, and obtaining the lithium ion battery material. The material prepared through the method is controllable in component and structure, zero in target material loss and suitable for large-scale production. The compounding of the oxide and the graphene can integrate the advantages of the two components, and the electrochemical performance of a single material is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium battery materials, and in particular relates to a lithium ion battery material and a preparation method thereof by superassembly and dealloying. Background technique [0002] In the field of lithium-ion battery technology, the current commercial negative electrode materials are mainly graphite materials, but this type of material has many disadvantages, such as: low theoretical specific capacity; short life; low initial charge and discharge efficiency; poor thermal stability, etc. . [0003] Compared with graphite materials, transition metal oxides have become a research hotspot because of their unique lithium storage mechanism and their relatively high reversible specific capacity. Among them, Co 3 o 4 It has stable properties and high specific capacity, and NiO has a high specific capacity for lithium storage capacity. The two are the most researched metal oxide anode materials at present. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/485H01M4/36H01M4/587H01M10/0525B82Y30/00B82Y40/00
CPCH01M4/525H01M4/485H01M4/364H01M4/587H01M10/0525B82Y30/00B82Y40/00H01M2004/027Y02E60/10
Inventor 孔彪李东玮谢磊高翔姜晓萍李勇
Owner FUDAN UNIV
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