Tin oxide modified carbon cloth base lithium and sodium metal negative electrode and preparation method thereof

A tin oxide, carbon cloth-based technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, electrical components, etc., can solve the problems of reducing the effective current density of the electrode, increasing the electrode specific surface area, and high copper price, achieving good cycle stability. The effect of suppressing the generation of dendrites and high safety performance

Inactive Publication Date: 2018-08-31
JIANGHAN UNIVERSITY
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Problems solved by technology

[0004] A variety of solutions have been used to solve the above-mentioned problem of dendrites. For example, the Chinese patent application number 201710177007.4 discloses "a method for surface treatment of negative electrodes of lithium metal batteries", which mainly forms a layer of 2nm to 200μm on the surface of lithium metal sheets. The solid electrolyte protective layer reduces the loss of lithium source and maintains the high Coulombic efficiency of the full battery; another example is the Chinese patent application number 201610259475.1 which discloses "metal lithium secondary battery and its negative electrode and porous copper current collector", which mainly adopts three-dimensional The porous copper current collector is used as the substrate, and metal lithium is adsorbed on the surface and interior of the cavity, which can increase the specific surface area of ​​the electrode and reduce the effective current density of the electrode, thereby inhibiting the generation of lithium dendrites; however, the copper price is high, and the cost of this method is high

Method used

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  • Tin oxide modified carbon cloth base lithium and sodium metal negative electrode and preparation method thereof
  • Tin oxide modified carbon cloth base lithium and sodium metal negative electrode and preparation method thereof
  • Tin oxide modified carbon cloth base lithium and sodium metal negative electrode and preparation method thereof

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preparation example Construction

[0030] A preparation method of tin oxide modified carbon cloth base lithium and sodium metal negative electrode, comprising the following steps:

[0031] 1) Carbon cloth pretreatment: use carbon cloth as the base material, ultrasonically clean it in acetone, ethanol, and ultrapure water for 30 to 50 minutes, heat treat it with concentrated nitric acid at 110 to 130°C for 7 to 10 hours, and then clean it again with ultrapure water cleaning;

[0032] 2) Modification solution configuration: configure a sodium stannate aqueous solution with a concentration of 0.066-0.1g / mL;

[0033] 3) Immerse the pre-treated carbon cloth in step 1) into the modified solution in step 2), ultrasonicate for 15-30 minutes, and perform a water bath reaction; the water bath reaction temperature is 70-90°C, and the time is 1-2 hours;

[0034] 4) The carbon cloth after the water bath reaction in step 3) is washed with deionized water and dried at 70-90°C;

[0035] 5) calcining the carbon cloth obtained...

Embodiment 1

[0038] 1) Use carbon cloth as the base material, ultrasonically clean it in acetone, ethanol, and ultrapure water for 30 minutes, immerse it in 67% concentrated nitric acid after drying, heat and stir in an oil bath at 110°C for 10 hours, and then use ultrapure water again wash and dry;

[0039] 2) Modification solution configuration: Dissolve 3.302g of sodium stannate tetrahydrate in 50ml of deionized water to prepare an aqueous solution of sodium stannate with a concentration of 0.066g / mL;

[0040] 3) Immerse the pretreated carbon cloth in step 1) into the modification solution in step 2), ultrasonicate for 30 minutes, and react in a water bath at 70°C for 2 hours;

[0041] 4) Wash the carbon cloth after the water bath reaction in step 3) with deionized water and dry at 90°C;

[0042] 5) Calcining the carbon cloth obtained in step 4) in the air, the calcination temperature is 400° C., the calcination time is 10 h, and the tin oxide modified carbon cloth base is obtained aft...

Embodiment 2

[0045] 1) Use carbon cloth as the base material, ultrasonically clean it in acetone, ethanol, and ultrapure water for 40 minutes, immerse it in 68% concentrated nitric acid after drying, heat and stir it in an oil bath at 120°C for 8 hours, and then use ultrapure water again wash and dry;

[0046] 2) Modification solution configuration: Dissolve 3.302g of sodium stannate tetrahydrate in 50ml of deionized water to prepare an aqueous solution of sodium stannate with a concentration of 0.066g / mL;

[0047] 3) Immerse the pretreated carbon cloth in step 1) into the modification solution in step 2), ultrasonicate for 30 minutes, and react in a water bath at 80°C for 1 hour;

[0048] 4) Wash the carbon cloth after the water bath reaction in step 3) with deionized water and dry at 80°C;

[0049] 5) Calcining the carbon cloth obtained in step 4) in the air, the calcination temperature is 450°C, the calcination time is 8h, and the tin oxide modified carbon cloth base is obtained after ...

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Abstract

The invention discloses a tin oxide modified carbon cloth base lithium and sodium metal negative electrode. The tin oxide modified carbon cloth base lithium and sodium metal negative electrode comprises carbon cloth used as a base, and tin oxide, lithium metal or sodium metal, wherein the mass ratio of carbon cloth to tin oxide to lithium metal is 1:0.048-0.065:1.2-1.8; the mass ratio of carbon cloth to tin oxide to sodium metal is 1:0.048-0.065:2.2-3.2; specifically, flexible porous carbon cloth is used as the support base; tin oxide is attached to the surface of the carbon cloth; and lithiumor sodium metal is adsorbed on the surface or holes of the tin oxide modified carbon cloth base. The invention also discloses a preparation method of the tin oxide modified carbon cloth based lithiumand sodium metal negative electrode. By virtue of the three-dimensional porous base, the reaction area of the battery negative electrode can be enlarged, and generation of dendritic crystal can be suppressed; the hole structure can be used for accommodating lithium or sodium deposition, and slowing down volume change of the lithium metal negative electrode or the sodium metal negative electrode in the charging-discharging cyclic process; and therefore, the voltage distribution curve can be more stable, and the negative electrode can be applied to a flexible energy storage device.

Description

technical field [0001] The invention belongs to the field of lithium and sodium metal batteries, in particular to a tin oxide modified carbon cloth-based lithium and sodium metal negative electrode and a preparation method thereof. Background technique [0002] The energy densities of lithium and sodium metal anodes are 3862mAh / g and 1166mAh / g, respectively, which are much larger than lithium-ion batteries and sodium-ion batteries, which makes them the most promising anode materials for next-generation lithium and sodium-sulfur and lithium and sodium-air batteries one. [0003] Lithium and sodium metal negative electrodes are easy to form unstable solid electrolyte membranes with liquid electrolytes, especially in the process of repeated charging and discharging of metal lithium and metal sodium, resulting in uneven ion flux, resulting in lithium dendrites and sodium dendrites. If the dendrites break, It will break away from the conductive framework to form "dead lithium" a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/1391H01M4/48H01M4/62
CPCH01M4/13H01M4/1391H01M4/48H01M4/625Y02E60/10
Inventor 刘钰旻熊万晟江云夏宇
Owner JIANGHAN UNIVERSITY
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