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Bismuth ferrite@titanium dioxide composite material for lithium-sulfur battery diaphragm and preparation method

A lithium-sulfur battery and composite material technology, applied in the direction of titanium dioxide, iron compounds, chemical instruments and methods, etc., can solve the problems of inability to inhibit the shuttle of polysulfides, the inability to effectively inhibit the shuttle effect, and the single function of the polypropylene diaphragm. Generation of heterogeneous phases, reduction of shuttling effects, effects of multiple active sites

Active Publication Date: 2021-09-24
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the polypropylene diaphragm that cannot effectively suppress the shuttle effect, the present invention proposes a bismuth ferrite@titanium dioxide composite material for lithium-sulfur battery diaphragm and its preparation method, and the lithium-sulfur battery diaphragm prepared by using the composite material has polysulfide Chemical adsorption, can effectively inhibit the shuttle effect, improve the cycle performance of lithium-sulfur batteries, and solve the technical problem that the polypropylene separator has a single function and cannot inhibit the shuttle of polysulfides

Method used

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  • Bismuth ferrite@titanium dioxide composite material for lithium-sulfur battery diaphragm and preparation method
  • Bismuth ferrite@titanium dioxide composite material for lithium-sulfur battery diaphragm and preparation method

Examples

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Embodiment 1

[0031] A method of preparing a lithium sulfur battery diaphragm based on a bismuth / titanium dioxide composite material, specifically comprising the steps of:

[0032] Step 1, kethale isopropyl titanate is added to ethanol, and the solution A is obtained at 60 ° C for 10 min, then the solution A is obtained, and then a diameter of 150 nm is added to the solution A and stir evenly to obtain a mixed solution B; wherein the solution A is The volume ratio of isopropyl titanate and ethanol is 0.05: 1, and the concentration of carbon ball in the mixed solution B is 1 mg / ml;

[0033] Step 2, the ammonia was added to the mixed solution B, and the reaction was stirred at 60 ° C to obtain a suspension C, centrifuged at 8000 rpm, dried, dried, 3 min in 400 ° C for 30 min, to obtain a white titanium dioxide powder; wherein ammonia water and mixing The volume ratio of solution B was 0.01: 1.

[0034] Step 3, add nitrate, bismuth nitrate, bismuth nitrate, and nitric acid, then add nitric aci...

Embodiment 2

[0043] According to the step of Example 1, a lithium sulfur battery diaphragm based on the bismuth / titanium dioxide composite is prepared, and only the titanate in the step 1 is adjusted to a n-butyl titanate, isopropyl titanate and ethanol in solution A. The ratio is 0.1: 1, the sintering time in step 2 is adjusted to 60 min, and the stirring time in step 3 is adjusted to 12 h, and the other steps are unchanged.

Embodiment 3

[0045] According to the steps of Example 1, a lithium sulfur battery diaphragm based on the bismuth / titanium dioxide composite is prepared, and only the nitrate, bismuth nitrate and nitrate in step 3 are adjusted as iron iron, oxalate and oxalate, organic solvent and nitric acid. Adjusting to ethylene glycol and oxalic acid, the molar ratio of citric acid and iron titrates is 2.2: 1, and other steps are unchanged.

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Abstract

The invention provides a bismuth ferrite@titanium dioxide (BFO@TiO2) composite material for a lithium-sulfur battery diaphragm and a preparation method thereof, belonging to the technical field of lithium-sulfur batteries. The bismuth ferrite@titanium dioxide composite material includes porous hollow sphere structure titanium dioxide, and bismuth ferrite particles attached to the outer surface, inner surface and pores of the titanium dioxide. Bismuth ferrite chemisorbs polysulfides due to its own asymmetric crystal structure that produces spontaneous polarization, while titanium dioxide with a porous hollow sphere structure provides a larger specific surface area and more active sites for the adsorption of polysulfides, effectively reducing the Possibility of polysulfides to cross the membrane, reducing the shuttling effect. In addition, the heterojunction structure formed by the bismuth ferrite particles and titanium dioxide improves the ion conductivity and electron mobility of the bismuth ferrite, which enables the secondary utilization of the adsorbed polysulfides and reduces the loss of battery capacity.

Description

Technical field [0001] The present invention belongs to the technical field of lithium sulfur battery, which relates to a modification method of a lithium sulfur battery diaphragm. 2 Composites and preparation methods. Background technique [0002] Energy crises and environmental issues are two major challenges facing today's human society, adjusting energy structure, and developing clean renewable new energy has become an urgent need of today's society. In all electrochemical energy storage systems, the lithium secondary battery has been widely studied and applied with its high voltage, high-specific capacity, long-term cycle life, no environmental pollution. [0003] Since the lithium sulfur battery (Li-S) has extremely high theoretical capacity (1675mAh / g) and energy density (2600WH / kg), sulfur combined with non-polluting, environmentally friendly, low cost, etc., lithium sulfur batteries It is predicted that the next generation of energy storage systems will play a key ro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/431H01M50/403H01M50/443C01G23/053C01G49/00
CPCC01G23/053C01G49/0018C01P2002/72C01P2004/04C01P2004/64C01P2004/84C01P2006/16H01M50/403H01M50/431Y02E60/10
Inventor 熊杰刘洋雷天宇陈伟胡音杨成韬晏超贻王显福
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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