A kind of lithium-ion/sodium-ion battery composite negative electrode material and preparation method thereof

A sodium-ion battery and negative electrode material technology, which is applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as low electronic/ionic conductivity, cumbersome electrode preparation methods, and reduced rate performance and cycle performance of electrode materials. Achieve the effects of high reactive sites, broad industrial application prospects, and excellent cycle stability

Active Publication Date: 2019-04-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to its low electronic / ionic conductivity, it reduces its rate performance and cycle performance as an electrode material; in addition, in the current process, tin selenide is used as a lithium (sodium) ion battery electrode. The combination of conductive carbon and binder, and subsequent smearing and other processes, the preparation method of the electrode is relatively cumbersome

Method used

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  • A kind of lithium-ion/sodium-ion battery composite negative electrode material and preparation method thereof
  • A kind of lithium-ion/sodium-ion battery composite negative electrode material and preparation method thereof
  • A kind of lithium-ion/sodium-ion battery composite negative electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] First place the conductive carbon paper in deionized water, alcohol, and ammonia water for 30 minutes, take it out and dry it, and use it as a working electrode, then weigh 4mmol of selenium dioxide, 12mmol of tin tetrachloride pentahydrate, and 250mmol of lactic acid in 1L of deionized water Stir for 10 minutes to make it all dissolve, then place the solution in the electrolytic cell, the working electrode has an area of ​​30cm 2 carbon paper, set the operating voltage to be -0.65V, and electrodeposit for 90 minutes to obtain the tin selenide / carbon paper composite material for lithium (sodium) ion batteries.

[0041] The lithium (sodium) ion battery composite negative electrode material prepared by this embodiment is assembled into a button battery with lithium (sodium) sheets, and its material characterization and electrochemical performance are as shown in the accompanying drawings:

[0042] figure 1 It can be seen that the positions and relative intensities of the...

Embodiment 2

[0048]First place the conductive carbon paper in deionized water, alcohol, and ammonia water for 30 minutes, take it out and dry it, and use it as a working electrode, then weigh 3mmol of selenium dioxide, 10mmol of tin tetrachloride pentahydrate, and 250mmol of lactic acid in 1L of deionized water Stir for 10 minutes to make it all dissolve, then place the solution in the electrolytic cell, the working electrode has an area of ​​30cm 2 carbon paper, set the operating voltage to be -0.65V, and electrodeposit 90min to obtain the tin selenide / carbon paper composite material for lithium (sodium) ion batteries. The composite negative electrode material for lithium (sodium) ion batteries prepared in this embodiment and Lithium (sodium) sheets are assembled into button cells.

[0049] The composite material prepared in this example and the lithium (sodium) sheet are assembled into a button battery. Under a constant current discharge density of 200mA / g, the sodium storage capacity ca...

Embodiment 3

[0051] First place the conductive carbon paper in deionized water, alcohol, and ammonia water for 30 minutes, take it out and dry it, and use it as a working electrode, then weigh 5mmol of selenium dioxide, 16mmol of tin tetrachloride pentahydrate, and 250mmol of lactic acid in 1L of deionized water Stir for 10 minutes to make it all dissolve, then place the solution in the electrolytic cell, the working electrode has an area of ​​30cm 2 carbon paper, set the operating voltage to be -0.65V, and electrodeposit 90min to obtain the tin selenide / carbon paper composite material for lithium (sodium) ion batteries. The composite negative electrode material for lithium (sodium) ion batteries prepared in this embodiment and Lithium (sodium) sheets are assembled into button cells.

[0052] The composite material prepared in this example and the lithium (sodium) sheet are assembled into a button battery. Under a constant current discharge density of 200mA / g, the sodium storage capacity c...

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Abstract

The invention discloses a composite cathode material for lithium ion / sodium ion batteries and a preparation method of the composite anode material. The composite cathode material is a tin selenide / carbon paper composite material which is obtained by electrochemical deposition with carbon paper serving as a working electrode and an aqueous solution of tin containing inorganic salt and lactic acid or sodium lactate. In the tin selenide / carbon paper composite material prepared according to the method, tin selenide nanoparticles are uniformly distributed on a carbon paper skeleton without adhesives and current collectors; the tin selenide / carbon paper composite material can be directly used as the cathode material for the lithium (sodium) ion batteries and has excellent flexibility and electrochemical performances.

Description

technical field [0001] The invention relates to the field of preparation of negative electrode materials for lithium ion / sodium ion batteries, in particular to a composite negative electrode material for lithium ion / sodium ion batteries and a preparation method thereof. Background technique [0002] As a socially dominant electrochemical energy storage device, lithium-ion batteries have achieved good results in portable electronics (laptops, smart mobile devices, tablets, etc.), electric vehicles, and plug-in hybrid electric vehicles. application. At the same time, sodium-ion batteries have also received widespread attention due to their rich reserves of sodium resources and environmental friendliness. The research and development of sodium-ion batteries can alleviate the limited development of batteries caused by the shortage of lithium resources to a certain extent, and are considered to be the next generation of electric vehicles. It is an ideal choice for automobile pow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M4/04H01M10/0525H01M10/054
CPCH01M4/0452H01M4/366H01M4/581H01M4/625H01M10/0525H01M10/054Y02E60/10
Inventor 张治安李军明史晓东赖延清张凯李劼
Owner CENT SOUTH UNIV
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