锂硫电池过渡金属磷化物复合正极材料研究概述

Review on the Transition Metal Phosphide Composite for Lithium-sulfur Battery Cathode

低碳、环保、高效是21世纪社会发展的主旋律。原材料廉价易得的锂硫(Li-S)电池因其超高能量密度(2500 Wh·kg^(-1))而受到能源转化与储备设备研究者的瞩目。然而,锂硫电池绝缘的活性物质与循环过程中不可避免的穿梭效应导致其反应动力学缓慢,进而造成包括循环倍率能力较差与库伦效率低下在内的诸多问题。研究人员现已发现了具有良好电导率且对多硫化物(LiPSs)具有吸附转化双重能力的过渡金属磷化物(TMPs)。本文将重点介绍运用在锂硫电池正极的不同过渡金属磷化物材料的设计合成方法与电化学性能提升研究相关进展,并对该类材料的未来发展进行展望。

Low-carbon,environmental-friendly and high efficiency are the main melody of the 21st centu-ry.Lithium-sulfur(Li-S)batteries with cheap and easily available raw material have attracted the atten-tion of many researchers of energy conversion and reserve equipment because of their ultra-high energy density(2500 Wh·kg^(-1)).However,the reaction kinetic of Li-S batteries is slow due to their insulating active material and inevitable shuttle effect during the cycle process,which leads to many problems inclu-ding poor cycle rate capability and low Coulombic efficiency.Researchers have found transition metal phosphides(TMPs)with good electrical conductivity and dual adsorption-conversion ability to polysulfide(LiPSs).Herein,the research progress of design and synthesis methods and electrochemical properties of different transition metal phosphide materials used in lithium-sulfur battery cathode will be introduced,and the future development of these materials will be prospected.