基于生物质锂硫电池正极材料合成及性能研究

Synthesis and Properties of Lithium Sulfur Battery Cathode Materials Based on Mold Spores

锂硫电池自诞生以来因其极高的理论比容量(1675mAh/g)及较为低廉的制造成本走在电池领域前沿.但是其广泛应用受到库伦效率较低、循环稳定性较差等因素影响.因此,优化设计锂硫电池正极成为目前研究热点之一.研究了一种以生物质黑曲霉(Aspergillus Nige)为碳源的锂硫电池复合正极材料.该材料不仅具有大量孔隙以及较高的比表面积,而且具有较高的导电性及活性物质利用率,另外由于生物质内自含的N、P杂原子使其能够有效抑制多硫化物的穿梭,从而提高锂硫电池的电化学性能.该复合材料在锂硫电池中,以0.1A/g电流密度下,历经100次循环仍能保持90%以上的库伦效率.另外,当不同倍率下充放电时,电池的容量保持率较高.不仅为锂硫电池的发展提供了一个新思路,而且也为其他电化学功能材料提供一种优质的生物质基体材料.

Lithium-sulfur batteries have been at the forefront of the battery field since their birth because of their extremely high theoretical specific capacity(1675mAh/g)and relatively low manufacturing costs.However,its wide application is affected by low coulomb efficiency and poor cycle stability.Therefore,optimizing the design of lithium-sulfur battery anode has become one of the research hotspots.In this paper,a kind of lithium-sulfur battery composite cathode material using aspergillus nige as carbon source is studied.The material not only has a large number of pores and a high specific surface area,but also has a high conductivity and utilization rate of active substances.In addition,due to the self-contained N and P heteroatoms in the biomass,it can effectively inhibit the shuttle of polysulfide,thereby improving the electrochemical performance of lithium-sulfur batteries.The composite material can maintain more than 90%coulomb efficiency after 100 cycles at 0.1A/g current density in lithium-sulfur battery.In addition,the capacity retention rate of the battery is higher when charging and discharging at different rates.This work not only provides a new idea for the development of lithium-sulfur batteries,but also provides a high quality biomass matrix material for other electrochemical functional materials.