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Novel optical gain lithium-sulfur battery and preparation method thereof

A lithium-sulfur battery, a new type of technology, applied in lithium batteries, electrolyte battery manufacturing, battery electrodes, etc., can solve the problems of solar energy and accelerate the electrocatalytic process, and achieve the effect of reducing power consumption, accelerating conversion, and accelerating conversion

Pending Publication Date: 2021-09-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, electrocatalysis is often used to catalyze polysulfides to accelerate their conversion and modify lithium-sulfur batteries. However, there is no research on the combination of photocatalysis and electrocatalysis on polysulfides to accelerate the electrocatalysis process.
At the same time, there is no related research on directly introducing solar energy into lithium-sulfur batteries and converting it into electrical energy, thereby saving energy consumption during charging.

Method used

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  • Novel optical gain lithium-sulfur battery and preparation method thereof
  • Novel optical gain lithium-sulfur battery and preparation method thereof
  • Novel optical gain lithium-sulfur battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Soak a clean carbon cloth in an isopropanol solution containing titanium butoxide, then dry it at 60°C, and then anneal at 500°C for 1 hour; then put it into a 6M hydrochloric acid hydrolyzed titanium butoxide solution and heat it at 150°C for 12 hours, wash and dry Annealing at 550°C for 2 hours can obtain the carbon cloth precursor on which titanium dioxide has been grown.

[0036] Then configure 5mM cadmium nitrate and sodium sulfide solutions respectively, soak the precursors for 3min in sequence, cycle 6-9 times, and dry at 60°C to obtain the positive electrode material containing the multifunctional catalyst. Put it into the glove box and circulate it for 12h; then drop 1mg of polysulfide.

[0037] Then the 2032-type button battery positive shell with a pore size of 10mm is glued firmly with PU, and the battery is assembled together with the positive electrode material containing polysulfide, lithium sheet, glass fiber diaphragm, perforated gasket and wave shrapne...

Embodiment 2

[0039] Soak a clean carbon cloth in an isopropanol solution containing titanium butoxide, then dry it at 60°C, and then anneal at 500°C for 1 hour; then put it into a 6M hydrochloric acid hydrolyzed titanium butoxide solution and heat it at 150°C for 12 hours, wash and dry Annealing at 550°C for 2 hours can obtain the carbon cloth precursor on which titanium dioxide has been grown.

[0040] A mixed solution of 5 mM cadmium nitrate and thiourea was then prepared, the precursor was put into it, hydrothermally reacted at 140° C. for 7 h, and then dried. Put it into the glove box and circulate it for 12h; then drop 1mg of polysulfide.

[0041] Then the 2025 type button battery positive shell with a pore size of 10 mm is glued firmly with PET, and the positive electrode material containing polysulfide, lithium sheet, PP diaphragm, perforated gasket and wave shrapnel are packed together in the glove box to form a battery, that is, A new type of light-gain lithium-sulfur battery.

...

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Abstract

The invention provides a novel optical gain lithium-sulfur battery and a preparation method thereof. At an opening window in a positive electrode shell, light is creatively introduced into a lithium-sulfur battery system, and a multifunctional catalyst capable of generating a photovoltaic effect is selected to prepare a positive electrode material, so that conversion of soluble polysulfide is accelerated through a photocatalytic mechanism; the problem that the capacity generated by the shuttle effect is low is solved; the preparation method comprises the following steps: firstly, performing in-situ growth of array-shaped nano-scale titanium dioxide on a substrate, wherein the array-shaped nano-scale titanium dioxide is used as a main catalyst to perform adsorption catalysis on polysulfide; secondly, growing cadmium sulfide crystals on the titanium dioxide as a cocatalyst to form a heterostructure with the titanium dioxide, generating a photovoltaic effect under illumination, accelerating the conversion of polysulfide by generated photo-generated electrons and photo-generated holes, and reducing the consumption of electric energy in the charging process, thereby improving the performance of the lithium-sulfur battery on the whole.

Description

technical field [0001] The invention belongs to the technical field of new energy, and in particular relates to a novel optical gain lithium-sulfur battery and a preparation method thereof. Background technique [0002] Lithium-sulfur battery is an energy storage system with high energy density, which has high development prospects. However, the shuttling effect of polysulfides generated during charge and discharge can lead to a significant decrease in battery cycle performance. Therefore, most of the prior art revolves around how to suppress the shuttle effect. [0003] The main solutions are physisorption, chemisorption, and electrochemical catalysis. Physical adsorption mostly uses carbon materials as the matrix to block the shuttle of polysulfides. Chemisorption mostly utilizes the electrostatic interaction between the adsorption matrix and polysulfides to suppress the shuttle effect. The effect of electrochemical catalysis is usually based on accelerating the conver...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/058H01M4/58H01M4/485
CPCH01M10/052H01M10/058H01M4/5815H01M4/485Y02P70/50Y02E60/10
Inventor 曲晋刘毓皓于中振
Owner BEIJING UNIV OF CHEM TECH
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