High specific capacity lithium ion battery material, preparation method and lithium ion battery

A lithium-ion battery, high specific capacity technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor rate performance, unsatisfactory cycle performance, and limit the application of lithium-ion batteries, and achieve increased structural stability. The effect of buffering the volume expansion stress

Active Publication Date: 2021-10-22
XIAMEN UNIV OF TECH
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Problems solved by technology

Lithium-ion batteries are mainly composed of positive and negative electrodes, electrolyte and separator. Traditional positive and negative electrodes are mainly composed of active materials, conductive agents, binders and current collectors. The existence of active materials in traditional lithium-ion batteries has poor rate performance. problems, and its cycle performance is not satisfactory, which limits the application of lithium-ion batteries in new energy vehicles

Method used

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  • High specific capacity lithium ion battery material, preparation method and lithium ion battery
  • High specific capacity lithium ion battery material, preparation method and lithium ion battery
  • High specific capacity lithium ion battery material, preparation method and lithium ion battery

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preparation example Construction

[0036] A preparation method of a high specific capacity lithium ion battery material provided by an embodiment of the present invention comprises the following steps:

[0037] S1, Zn salt and imidazole compounds are reacted at room temperature to prepare Zn-ZIF nanosheets;

[0038] S2, after sequentially calcining the Zn-ZIF nanosheets in an inert atmosphere and an air atmosphere, to obtain ZnO / NC nanosheets;

[0039] S3, dispersing the ZnO / NC nanosheets in the glucose solution, and then adding molybdate and sulfur source to obtain a mixed solution, the mixed solution is subjected to a high-temperature hydrothermal reaction to obtain a high specific capacity lithium-ion battery material, the The lithium-ion battery material is expressed as ZnS@MoS 2 / NC.

[0040] Further, in step S1, the Zn salt is selected from one or more of zinc nitrate hexahydrate, zinc sulfate heptahydrate and zinc chloride. The imidazole compound is selected from one or more of 2-methylimidazole, 4-ni...

Embodiment 1

[0054] A high specific capacity lithium-ion battery material (ZnS@MoS) provided in this embodiment 2 / NC), which were prepared according to the following steps:

[0055] (1) Preparation of Zn-ZIF nanosheets: take Zn(NO 3 ) 2 6H 2 O and 2-methylimidazole were dissolved in methanol to prepare 2mmol / L cobalt nitrate hexahydrate solution and 12mmol / L 2-methylimidazole solution. Pour the cobalt nitrate hexahydrate solution into the 2-methylimidazole solution at a constant speed according to the volume ratio of 1:1 at room temperature, and stir while adding. After the addition, the mixture was magnetically stirred at room temperature for 4 hours, and a white precipitate was obtained after repeated centrifugation and deionized water washing operations. The precipitate was vacuum-dried at 60° C. to obtain white powdery Zn-ZIF nanosheets.

[0056] (2) Preparation of ZnO / NC nanosheets: in N 2 In the atmosphere, the Zn-ZIF nanosheets were heated to 650 °C at a heating rate of 1 °C / ...

Embodiment 2

[0060] A high specific capacity lithium-ion battery material (ZnS@MoS) provided in this embodiment 2 / NC), which were prepared according to the following steps:

[0061] (1) Preparation of Zn-ZIF nanosheets: prepared according to the method provided in Example 1.

[0062] (2) Preparation of ZnO / NC nanosheets: prepared according to the method provided in Example 1.

[0063] (3) Preparation of ZnS@MoS 2 / NC nanosheets: Disperse 0.05 g of ZnO / NC nanosheets in 30 ml of glucose solution with a concentration of 0.1mol / L and stir evenly, then add 0.3 g of ammonium molybdate ((NH 4 ) 2 MoO 4 ) and 0.6 g of thioacetamide were mixed uniformly to obtain a mixed solution. The mixture was transferred to a stainless steel autoclave, heated to 180 °C and kept for 24 h, then naturally cooled to room temperature. The reactants were collected by centrifugation and washed with water, and dried in a vacuum oven at 60°C for 12 hours to obtain ZnS@MoS 2 / NC nanosheets.

[0064] at 500 mA g ...

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Abstract

The invention provides a high specific capacity lithium ion battery material, a preparation method and the lithium ion battery, and relates to the technical field of new energy sources. The preparation steps are as follows: reacting Zn salt and imidazole compound at room temperature to prepare Zn-ZIF nanosheets; calcining the Zn-ZIF nanosheets to obtain ZnO / NC nanosheets. Disperse ZnO / NC nanosheets in glucose solution, add molybdate and thiourea, and obtain a high specific capacity lithium-ion battery material (ZnS@MoS 2 / NC). The battery material has a unique hierarchical porous sheet structure, which inhibits the agglomeration and stacking of sheet materials and enhances the pseudocapacitive capacity. In this material, ZnS and MoS 2 The formation of a bimetallic sulfide heterointerface provides more sites for the adsorption of lithium ions, and also promotes the diffusion and transport of lithium ions, resulting in better rate performance.

Description

technical field [0001] The invention relates to the technical field of new energy, and in particular to a high specific capacity lithium ion battery material, a preparation method and the lithium ion battery. Background technique [0002] With the shortage of coal, oil and other energy sources and the increasingly serious environmental pollution, the development of sustainable new energy has become the focus of social attention and the focus of scientific research, and the development of large-scale energy storage technology has become more and more popular. Pay attention to. New energy vehicles are increasingly favored by consumers because they are powered by batteries and are green and environmentally friendly. The power batteries of current new energy vehicles mainly use lithium-ion batteries. Lithium-ion batteries are mainly composed of positive and negative electrodes, electrolyte and separator. Traditional positive and negative electrodes are mainly composed of activ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/58H01M4/583H01M4/62H01M10/0525
CPCH01M4/366H01M4/48H01M4/5815H01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 李晓丹张旻澍张文堤余泽锦
Owner XIAMEN UNIV OF TECH
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