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Preparation of high-performance ZnS @ SiO2/C cathode and lithium/sodium storage application of cathode

A high-performance, negative-electrode technology, applied in battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of high raw material and technology costs, lack of mechanical stability and durability, structural damage, etc. Sustainable development prospects and research value, stable electrochemical performance and high reversibility, and the effect of realizing waste resource recycling

Inactive Publication Date: 2019-02-01
SOUTHWEST UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of these reactors are nano-carbon film structures. Although they can effectively improve the cycle performance of sulfide negative electrodes, the cycle life of the electrodes still cannot meet the requirements of practical applications. The main reason is that although the nano-carbon films have good electrical conductivity, they lack Sufficient mechanical stability and durability, and its structure is prone to serious damage due to the influence of the internal force of the electrode for a long time, resulting in rapid decay of the specific capacity of the electrode and poor cycle performance.
In addition, the cost of raw materials and technology for preparing the above-mentioned nanoreactors is high, and it is difficult to popularize and apply

Method used

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  • Preparation of high-performance ZnS @ SiO2/C cathode and lithium/sodium storage application of cathode
  • Preparation of high-performance ZnS @ SiO2/C cathode and lithium/sodium storage application of cathode
  • Preparation of high-performance ZnS @ SiO2/C cathode and lithium/sodium storage application of cathode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 ZnS@SiO 2 Synthesis of / C anode materials

[0035] (1) ZnS@Si(OH) 4 Synthesis of precursors: ultrasonically dissolve zinc salts and organic salts in deionized water, add a small amount of waste glass fragments, stir and react in a heated water bath, the solution changes from colorless and transparent to white suspension, and after cooling, use deionized Washing with water, filtering and drying to obtain the precursor powder;

[0036] (2) ZnS@SiO 2 Synthesis of / C anode material: ZnS@Si(OH) prepared in step (1)(a) 4 The precursor powder was evenly distributed inside the crucible, and then the crucible was placed in the middle area of ​​the quartz tube furnace, and under the protection of a nitrogen atmosphere, the o Cmin -1 The heating rate increases to 900 o C. At this time, the ethanol saturated steam is slowly introduced into the inlet valve, and the ethanol gas is quickly brought to the central area of ​​the tube furnace by the air flow and continues to...

Embodiment 2

[0038] Example 2 uses ZnS@SiO 2 Production and testing method of lithium / sodium storage battery with / C as negative electrode

[0039] (1) Preparation of negative electrode sheet: ZnS@SiO obtained in step (1) 2 / C Powder material, conductive agent, binder are fully ground in a ball mill with an organic solvent in a mass ratio of 8:1:1, and then the resulting slurry is evenly coated on a copper foil with a scraper, and it is obtained after vacuum baking ZnS@SiO 2 / C negative plate;

[0040] (2) Half-cell assembly and performance testing: ZnS@SiO 2 / C Negative plate is transferred to the glove box and packaged with CR 2025 button battery case;

[0041] (a) For the lithium storage half-cell test, the lithium sheet was used as the counter electrode, and the Celgard 2500 type polypropylene film was used as the separator, dissolved with 1 M LiPF 6 And the EC / DEC mixture with a volume ratio of 1:1 is used as the electrolyte;

[0042] (b) For the sodium storage half-cell test, t...

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Abstract

The invention relates to preparation of a high-performance ZnS @ SiO2 / C composite cathode material and a lithium / sodium storage application of the material. For the problem of poor cycle performance of sulfide (such as ZnS) due to volume expansion and dissolution / diffusion loss during lithium / sodium storage, a core-shell ZnS @ SiO2 / C nanocomposite is realized through simple liquid phase reaction and vapor deposition by using zinc salt, ethanol, waste glass and other raw materials. Compared with ZnS cathode, the main advantages of the composite cathode material are that: the outer layer of SiO2 / C has stable structure and strong strain resistance, low quality proportion, thin thickness and low ion / electron transmission impedance; the preparation raw materials are cheap and easily-available,and the production process is simple; ZnS @ SiO2 / C shows excellent electrochemical performance when the ZnS @ SiO2 / C is used as the lithium / sodium ion battery cathode. The preparation method of the material is novel, effective and ingenious, can fully realize the recycle of glass resources, and provides an effective basis for the development of the high-performance sulfide cathode.

Description

technical field [0001] The invention belongs to the technical field of lithium ion and sodium ion batteries, in particular to a core-shell ZnS@SiO 2 Preparation method and application of / C composite negative electrode material. Background technique [0002] With the popularization and application of green new energy, the development of electrochemical energy conversion and storage devices has attracted extensive attention. Compared with other storage batteries (such as fuel cells, alkaline batteries, lead-acid batteries, etc.), lithium / sodium ion batteries have significant advantages in electrochemical energy storage. Lithium-ion batteries have the characteristics of high energy density, high output voltage, long cycle life and environmental friendliness, and have been widely used in portable devices and electronic vehicles. fourth), and has similar physical and electrochemical properties to lithium-ion batteries, and has gradually become a research hotspot in the field o...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M4/58H01M4/62H01M10/0525H01M10/054
CPCH01M4/48H01M4/5815H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 蒋建刘娅妮朱建慧
Owner SOUTHWEST UNIVERSITY
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