A lithium ion battery material and its preparation method using superassembly and dealloying

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

Active Publication Date: 2022-08-02
FUDAN UNIV
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  • 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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  • A lithium ion battery material and its preparation method using superassembly and dealloying
  • A lithium ion battery material and its preparation method using superassembly and dealloying
  • A lithium ion battery material and its preparation method using superassembly and dealloying

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Experimental program
Comparison scheme
Effect test

Embodiment 1

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

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

[0046] In step S3, graphene oxide powder is prepared by the hummers method, and 20 mg of graphene oxide is added into 40 mL of ultrapure water and ultrasonicated for 1 h to prepare a graphene oxide dispersion liquid. Mix the precursor obtained in step S2 with the graphene oxide solution, and magnetically stir for 1 h at 25° C. and a rotating speed of 2000 rpm to obtain a mixed solution.

[0047] Step S4, add 50 ...

Embodiment 2

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

[0060] In step S1, free etching was performed 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 performed 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 using superassembly and dealloying. Alkaline solution, carry out dealloying reaction; then add aminopropyltrimethoxysilane, and ultrasonic for a period of time to obtain precursor; then graphene oxide powder is made into graphene oxide dispersion, and mixed with precursor according to a certain mass ratio, Then, ammonia water and citric acid are added to obtain the material intermediate; finally, the material intermediate is heated to a certain temperature in a predetermined atmosphere, kept for a certain period of time, and then lowered to room temperature to obtain a lithium ion battery material. The material prepared by this method has the same composition as The structure is controllable, the target material has zero loss, and is suitable for mass production. The composite of oxide and graphene can combine the advantages of the two components to improve the electrochemical performance of a single material.

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 using super-assembly and dealloying. Background technique [0002] In the field of lithium-ion battery technology, the current commercial anode materials are mainly graphite materials. However, such materials have many shortcomings, such as: low theoretical specific capacity; short life; low first charge and discharge efficiency; poor thermal stability, etc. . [0003] Compared with graphite-based materials, transition metal oxides have become a research hotspot due to their unique lithium storage mechanism capable of exhibiting relatively high reversible specific capacities. 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 studied metal oxide anode materials at present. H...

Claims

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Application Information

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Patent Type & Authority Patents(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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