Lithium-sulfur battery positive-pole composite material with imitated cellular structure and preparation method thereof

A lithium-sulfur battery and composite material technology, applied in the field of electrochemical energy, can solve the problems of low cycle stability and capacity retention rate, affecting electrode stability, loss of active materials, etc., to enhance electrochemical activity and be beneficial to structural stability. , the effect of reducing the reactivity

Active Publication Date: 2016-04-20
XIANGTAN UNIV
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Problems solved by technology

[0005] (1) Elemental sulfur at room temperature as S 8 It exists in the form of a typical electronic and ionic insulator, and its conductivity is about 5×10 -30 S/cm, when used as a battery active material, the utilization rate is not high
[0006] (2) Lithium polysulfide Li, an intermediate product of sulfur in the battery discharge process 2 S x (3≤x≤8), easily soluble in organic solvents, resulting in loss of active material, lower specific capacity, and poor cycle stability
In addition, the long-chain lithium polysulfide dissolved in the organic solvent will move from the positive electrode to the negative electrode, and undergo a reduction reaction with the negative electrode lithium to form a short-chain polysulfide, and the formed short-chain polysulfide will diffuse to the positive electrode and the negative electrode. The dissolved sulfide ions react to form long-chain lithium polysulfides, and this cycle, the so-called shuttle effect, leads to low battery charge and discharge efficiency; in addition, the lithium polysulfides formed on the negative electrode will also be reduc

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  • Lithium-sulfur battery positive-pole composite material with imitated cellular structure and preparation method thereof
  • Lithium-sulfur battery positive-pole composite material with imitated cellular structure and preparation method thereof
  • Lithium-sulfur battery positive-pole composite material with imitated cellular structure and preparation method thereof

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[0052] Example 1

[0053] At 25°C, 0.1g PVP was added to 450mL 0.1M hydrochloric acid solution, stirred and sonicated for 30min to disperse until transparent and clear, to obtain solution A, 4.96g sodium thiosulfate was added to 50mL deionized water and stirred to dissolve to obtain solution B, Place solution A at a constant temperature of 30° C., stir continuously, add solution B to solution A dropwise, and react for 2 hours. The product is centrifuged, washed and dried to obtain elemental sulfur particles. Combine the obtained elemental sulfur particles and 0.05g SiO 2 (The particle size is 15 nm) and 1 g of PVP are dispersed into 200 mL of deionized water to obtain suspension C. The suspension is stirred and sonicated for 20 minutes to make the sulfur particles and silica uniformly dispersed. The suspension C was stirred at room temperature, 0.2g aniline monomer and 1mL concentrated hydrochloric acid were added dropwise, and after it was uniformly dispersed, 0.4g ammonium per...

Example Embodiment

[0058] Example 2

[0059] At 25°C, 0.1g PVP was added to 450mL 0.1M hydrochloric acid solution, stirred and sonicated for 30min to disperse until transparent and clear, to obtain solution A, 4.96g sodium thiosulfate was added to 50mL deionized water and stirred to dissolve to obtain solution B, Place the A solution at a constant temperature of 30° C., stir continuously, add the B solution to the A solution dropwise, and react for 2 hours. The product is centrifuged, washed and dried to obtain elemental sulfur particles. Combine the obtained elemental sulfur particles and 0.05g SiO 2 (The particle size is 15 nm) and 1 g of PVP are dispersed into 200 mL of deionized water to obtain suspension A. The suspension is stirred and sonicated for 20 minutes to make the sulfur particles and silica uniformly dispersed. Stir the suspension A at room temperature, add 0.2 g of pyrrole monomer dropwise, wait until it is uniformly dispersed, add 0.3 g of ferric chloride aqueous solution, continu...

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Abstract

The invention discloses a lithium-sulfur battery positive-pole composite material with an imitated cellular structure and a preparation method thereof. In the positive-pole composite material, a conductive polymer film layer and nanometer oxide inlaid inside the conductive polymer film layer form a cell membrane, an elemental sulfur particle serves as a cell nucleus, and the three portions jointly form the imitated cellular structure. The composite material is prepared by conducting ultrasonic dispersion on the elemental sulfur particle and the nanometer oxide in water in the presence of a surface active agent, adding a conductive polymer monomer and an acid solution, performing even stirring and then adding an oxidizing agent to perform stirring reaction. The preparation method is simple in process, low in cost, low in energy consumption, controllable in sulfur content and good in repeatability and enables large-scale production to be easily achieved. The composite material is made into a lithium-sulfur battery positive pole, loss of active substances in the charging-discharging process can be effectively inhibited, improvement of the specific discharge capacity of a battery material and the utilization ratio of the active substances is facilitated, and accordingly the battery cycle performance is greatly improved.

Description

technical field [0001] The invention relates to a lithium-sulfur battery positive electrode composite material with a cell-like structure and a preparation method thereof, in particular to a positive electrode composite material in which a nano-oxide is embedded in a conductive polymer shell structure to form a cell-like membrane structure coated sulfur particles and its preparation The method belongs to the technical field of electrochemical energy. Background technique [0002] Since entering the 21st century, with the changes of the times, energy storage technology has provided infinite and broad application possibilities. As the main direction of energy storage technology, high-performance batteries are not only in the support and core position in the new energy field, but also in military and aerospace Therefore, the development of high-performance batteries has become an indispensable and important part of today's technological development. [0003] Currently commerci...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M10/052
CPCH01M4/364H01M4/38H01M4/48H01M10/052Y02E60/10
Inventor 马增胜王文轩成娟娟陈鸿伟雷维新潘勇
Owner XIANGTAN UNIV
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