将2D纳米片NiFeP生长在Ketjen Black ECP-600JD炭黑(KB)上制备出花球颗粒状NiFeP/KB电催化剂,再将其与纳米硫颗粒按适当比例均匀混合制备出锂硫电池的正极.这种S/NiFeP/KB正极在0.1C下首次放电比容量为1454.5 mAh/g,循环200次后仍有821.1 mAh/g,在2C下300次循环后比容量为639.9 mAh/g,容量保持率达74.7％;使用NiFeP/KB电催化剂能提高电池中多硫化锂的氧化、还原反应速率,从而改善锂、硫反应动力学.
Preparation and Performance of S/NiFeP/KB Composites Electrocatalyst for Lithium Sulfur Batteries
Transition metal phosphide has not only metal-like conductive properties but good adsorp-tion and catalytic conversion of polysulfide lithium.In this paper,the NiFeP/KB electrocatalyst grown by 2D nanosheet NiFeP on Ketjen Black ECP-600JD carbon black(KB)was prepared.The S/NiFeP/KB cathode material was obtained by mixing the nano sulfur particles with NiFeP/KB in a proportional and uniform way.Due to the synergistic effect of metal doping and hierarchical structure,the electrode pre-pared using S/NiFeP/KB material had a specific capacity of 1454.5 mAh/g at 0.1 C for the first discharge,which remained 821.1 mAh/g after 200 cycles,639.9 mAh/g after 300 cycles at 2C,and the capacity re-tention rate reached 74.7％.Further combined with CV and EIS tests,the NiFeP/KB electrocatalyst can effectively improve the oxidation and reduction reaction rate of lithium polysulfide in the battery,thus pro-moting the reaction kinetics of lithium and sulfur.
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