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Preparation method and application of Sn-Co@void@C composite material

A composite material, fully mixed technology, used in electrical components, electrochemical generators, battery electrodes, etc., to achieve the effect of improving ionic and electronic conductivity, improving cycle stability, and improving electrochemical performance

Inactive Publication Date: 2021-05-04
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is difficult to better solve the problem of this type of negative electrode material by using the above single method

Method used

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  • Preparation method and application of Sn-Co@void@C composite material
  • Preparation method and application of Sn-Co@void@C composite material
  • Preparation method and application of Sn-Co@void@C composite material

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Embodiment

[0022] The schematic diagram of the preparation process of Sn-Co@void@C composite material is as follows figure 1 shown. Preparation of CoSn(OH) by coprecipitation method 6 , to obtain SnO after heat treatment in air 2 / Co 3 o 4 followed by SiO 2 and C coating, followed by washing away SiO 2 layer, and the Sn-Co@void@C composite was obtained after heat treatment. The specific steps are:

[0023] (1) Weigh 10mmol SnCl 4 ·5H 2 O was dissolved in 1L deionized water, marked as A solution, and then 10mmol Co(NO 3 ) 2 ·6H 2 Dissolve O in 1L of deionized water, marked as solution B, dissolve 2.4g NaOH in 100mL of deionized water, marked as solution C, add solution C to solution A, and place the resulting mixed solution on a magnetic stirrer at 600r min -1 The speed was stirred for 10min, and the B solution was poured into the reaction for 6h, and the obtained sample was washed with deionized water to neutrality to obtain CoSn(OH) 6 , and then placed in the air for heat t...

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Abstract

The invention discloses a preparation method and application of a Sn-Co@void@C composite material. CoSn (OH) 6 is synthesized through a coprecipitation method, SnO2 / Co3O4 is obtained through heat treatment, then SiO2 and a carbon layer are coated, SiO2 is washed away, carbon thermal reduction is carried out, and finally the Sn-Co@void@C composite material is obtained and applied to a sodium ion battery negative electrode material. The hollow core-shell structure is designed and synthesized, so that the volume expansion problem of the metal inner core is relieved, and the cycling stability is improved. According to the invention, Sn is divided into a plurality of micro-regions by using metal Co, so that the generation of dead sodium is reduced, the cycling stability of the material is further improved, and a novel thought is provided for solving the problem of volume expansion of the metal-based negative electrode material.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials and electrochemical energy storage, and specifically designs a preparation method of Sn-Co@void@C and its application. The composite material is applied to the negative electrode material of the sodium ion battery, and has certain popularization. Background technique [0002] Sn-based anode materials have become one of the research hotspots of anode materials for sodium-ion batteries because of their higher theoretical specific capacity and safer characteristics. According to the research data in recent years, the electrochemical performance of tin-based alloy anode materials has been significantly improved, but there are still some problems that have not been completely resolved. For example, the irreversibility of the first discharge capacity, poor cycle performance, continuous growth of SEI film on the crystal phase surface and formation of oxide film, agglomeration of active m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/054B82Y40/00
CPCB82Y40/00H01M4/362H01M4/387H01M4/62H01M4/625H01M4/626H01M4/628H01M10/054Y02E60/10
Inventor 黄斌刘爽李伟李欣泽杨建文倪文浩
Owner GUILIN UNIVERSITY OF TECHNOLOGY