用纳米羟基磷灰石@多孔碳构建锂硫电池高效反应界面  

Efficient Interface Enabled by Nano-Hydroxyapatite@Porous Carbon for Lithium-Sulfur Batteries

作　　者：汪佳裕 仝学锋 彭启繁 关越鹏 王维坤[3] 王安邦[3] 刘乃强 黄雅钦[1] Jia-Yu Wang;Xue-Feng Tong;Qi-Fan Peng;Yue-Peng Guan;Wei-Kun Wang;An-Bang Wang;Nai-Qiang Liu;Ya-Qin Huang(Beijing Key Laboratory of Electrochemical Process and Technology for Materials,Key Laboratory of Biomedical Materials of Natural Macromolecules,Ministry of Education,Beijing University of Chemical Technology,Beijing 100029,P.R.China;Beijing Key Laboratory of Clothing Materials R&D and Assessment,Beijing Engineering Research Center of Textile Nano Fiber,Beijing Institute of Fashion Technology,Beijing 100029,People's Republic of China;Research Institute of Chemical Defense,Beijing 100191,P.R.China;School of Materials Science and Engineering,Sichuan University of Science&Engineering,Zigong 643000,P.R.China)

机构地区：[1]材料电化学过程与技术北京市重点实验室,天然高分子生物医用材料教育部重点实验室,北京化工大学,北京100029 [2]北京服装学院服装材料研究开发与评价北京市重点实验室,北京市纺织纳米纤维工程技术研究中心,北京100029 [3]防化研究院,北京100191 [4]四川轻化工大学材料科学与工程学院,四川自贡643000

出　　处：《电化学》2022年第11期110-122,共13页Journal of Electrochemistry

基　　金：supported by the National Natural Science Foundation of China.No.51861165101 Foundation name:Multi-functional ion-exchange membrane for sulfur-based batteries and understanding the charge transport and ion-immobilization mechanism。

摘　　要：由于正极活性物质硫具有能量密度高、成本低廉和储量丰富等优点,锂硫(Li-S)电池受到了人们的极大关注。然而,锂硫电池充放电过程中产生的多硫化锂的“穿梭效应”严重阻碍了其实用化进程。为了解决这个问题,本研究借助动物软骨的组成和结构特点,制备了纳米羟基磷灰石@多孔碳(nano-HA@CCPC)复合材料,并以此设计了面向正极的锂硫电池隔膜涂层。研究表明,纳米羟基磷灰石不仅对多硫化物具有吸附固定作用,并且对多硫化锂的转化具有催化作用,加快了多硫化锂的氧化还原动力学,有效地提升了活性物质硫的利用率。另外,软骨基碳复合材料的多孔结构形成了很好的导电网络,为电化学反应提供了优良的电子传导路径;也有利于电解液的浸润,加快了离子传输;碳的氮原子掺杂进一步限制了多硫化物的穿梭效应。因此,采用nano-HA@CCPC隔膜涂层的锂硫电池表现出较长的循环寿命、低的容量损失以及高的倍率性能。在0.5 C下,循环325次后,电池仍然能保持815 m Ah·g^(-1)的放电比容量,并且每次的容量衰减率仅为0.051%。nano-HA@CCPC的设计制备将为锂硫电池的发展提供新材料。The dissolution and“shuttle effect”of lithium polysulfides(Li PSs)hinder the application of lithium-sulfur(Li-S)batteries.To solve those problems,inspired by natural materials,a nano-hydroxyapatite@porous carbon derived from chicken cartilage(nano-HA@CCPC)was fabricated by employing a simple pre-carbonization and carbonization method,and applied in Li-S batteries.The nano-HA@CCPC would provide a reactive interface that allows efficient Li PSs reduction.With a strong affinity for Li PSs and an excellent electronic conductive path for converting Li PSs,the shuttle effect of Li PSs was confined and the redox kinetics of Li PSs was substantially enhanced.Li-S batteries employing nano-HA@CCPC-modified separators exhibited long cycle life and improved rate capability.At 0.5 C after 325 cycles,a specific capacity of 815 m Ah·g^(-1)and a low capacity fading rate of 0.051%were obtained.The superior properties,sustainable raw materials,and facile preparation process make nano-HA@CCPC a promising additive material for practical Li-S batteries.

关 键 词：导电碳框架 纳米羟基磷灰石 反应界面 改性隔膜 氧化还原反应动力学 锂硫电池 

分 类 号：TM912[电气工程—电力电子与电力传动] TB332[一般工业技术—材料科学与工程]