Composite material for electrode and preparation method of composite material

A composite material and electrode technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of limited high theoretical specific capacity and low conductivity of semiconductors

Active Publication Date: 2020-10-23
GUANGZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the prior art, on the one hand, the conductivity of semiconductors such as transition metal oxides is not high, which limits the realization of their high theoretical specific capacity

Method used

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  • Composite material for electrode and preparation method of composite material
  • Composite material for electrode and preparation method of composite material
  • Composite material for electrode and preparation method of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0038] This example prepares a composite material for electrodes, including the following steps:

[0039] S1: Dissolve 2 mmol of hexahydrate nickel chloride and 9 g of sodium lauryl sulfate in 400 ml of water, and stir for 30 min to form a clear liquid;

[0040] S2: Dissolve 2 mmol of potassium tetracyanonickelate in 400ml of water and stir for 30 min, then slowly add the solution prepared in step S1 into the potassium tetracyanonickelate solution, stir evenly, and leave it for 24 hours to obtain a nickel metal organic framework, such as figure 1 As shown, the synthesized nickel metal organic framework has a sheet-like structure with a diameter of about 2 μm. This two-dimensional structure is not easy to deform during the charging and discharging process of the battery, and can better maintain the capacity retention rate, and is not easy to decay. The large surface area can also provide a wide range of reaction sites for subsequent processing;

[0041] S3: Put nickel metal or...

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Abstract

The invention provides a composite material for an electrode and a preparation method of the composite material. The composite material comprises a vulcanized nickel metal organic framework, tin disulfide is distributed on the vulcanized nickel metal organic framework, and the surface of the composite material is of a honeycomb structure. Compared with a single metal compound, the composite material for the electrode has higher conductivity, a heterojunction exists at the joint of tin sulfide and tin disulfide, the transmission path of ions can be shortened, and therefore the reaction kineticsis improved. Due to the multistage structure, the specific surface area of the material is further increased, the sites of chemical reaction are increased, the surface of the composite material is ofthe honeycomb structure, space is provided for deintercalation of ions, buffer space is provided for deformation of the battery in cycle operation, and therefore the service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of electrode materials, and in particular relates to a composite material for electrodes and a preparation method thereof. Background technique [0002] With the development of technology, portable devices emerge in an endless stream. As an important energy storage device, lithium-ion battery is a research hotspot in current energy issues. Lithium-ion batteries are composed of negative electrode materials, separators, electrolytes and positive electrode materials. The discharge voltage of a lithium-ion battery is jointly determined by the lithium potential of the positive and negative electrode materials. The greater the potential of the positive electrode material to lithium and the smaller the potential of the negative electrode material to lithium, the greater the discharge voltage of the single battery. On the premise of the same specific capacity Under the circumstances, the higher the specific energy ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58C01G19/00H01M10/0525
CPCH01M4/362H01M4/5815C01G19/00H01M2004/021H01M10/0525Y02E60/10
Inventor 范浩森蔡泽林刘芝婷杨伟郑文芝梁华健
Owner GUANGZHOU UNIVERSITY
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