Raghunandanan Aswathy, Mani Ulaganathan, Pitchai Ragupathy
Flow Battery Section, Electrochemical Power Sources Division, CSIR-Central Electrochemical Research Institute Karaikudi-630 003 Tamil Nadu India
Academy of Scientific and Innovative Research New Delhi India.
RSC Adv. 2018 Jul 4;8(43):24261-24267. doi: 10.1039/c8ra03793k. eCollection 2018 Jul 2.
Realization of the lithium-sulfur battery system is of major concern because a theoretical cell capacity of 1675 mA h g can be obtained at an average voltage of 2.1 V. The primary issues that hinder the practical applications of this system include its poor utilization of sulfur, limited cycle life and retarded rate performance. In the present study, hemp-derived carbon (C-hemp) is made into a composite with room temperature-synthesized MnO, which acts as a host for sulfur in the lithium-sulfur battery system. The composite material is characterized physico-chemically and electrochemically using various techniques. This composite exhibits better electrochemical performance as a sulfur carrier compared to pristine carbon. An initial specific capacity of 926 mA h g is obtained at 0.1 C for C-hemp/MnO-sulfur, which surpasses that of the C-hemp-sulfur sample. C-hemp provides a conductive matrix as well as porous sites for the accommodation of sulfur, while MnO exhibits the ability to absorb polysulfide chemically. Thus, this composite is established as a potential cathode for lithium-sulfur batteries.
锂硫电池系统的实现备受关注，因为在平均电压为2.1 V时可获得1675 mA h g的理论电池容量。阻碍该系统实际应用的主要问题包括硫的利用率低、循环寿命有限和倍率性能滞后。在本研究中，将大麻衍生碳（C-大麻）与室温合成的MnO制成复合材料，MnO在锂硫电池系统中作为硫的主体。使用各种技术对该复合材料进行了物理化学和电化学表征。与原始碳相比，这种复合材料作为硫载体表现出更好的电化学性能。对于C-大麻/MnO-硫，在0.1 C时获得的初始比容量为926 mA h g，超过了C-大麻-硫样品。C-大麻提供了导电基质以及用于容纳硫的多孔位点，而MnO表现出化学吸收多硫化物的能力。因此，这种复合材料被确立为锂硫电池的潜在阴极。
