摘要
金属氯化物-石墨插层化合物具有导电性优异,石墨层间距大等特点,可用作钠离子电池负极材料。然而,在传统金属氯化物插层石墨过程中,不可避免地用到氯气,既增加了实验操作的风险,也对实验设备提出更高要求。基于上述原因,本文创新性地使用SO_(2)Cl_(2)作为氯源来促进BiCl_(3)插层石墨。该方法不仅有效提高了BiCl_(3)插层效率,也避免了直接使用氯气带来的安全性风险。采用该方法所合成的三氯化铋-石墨插层化合物(BiCl_(3)-GICs)的层间距为1.26 nm,BiCl_(3)插层含量高达42%。以其为负极材料,组装的钠离子电池具有高的比容量(213 mAh g^(-1)at 1 A g^(-1))和优异的倍率性能(170 mAh g^(-1)at 5 A g^(-1))。此外,原位拉曼光谱测试结果表明,首圈放电后石墨与插层的BiCl_(3)相互作用减弱,该过程有效促进了钠离子在石墨层内的存储。采用该方法可成功制备多种类型金属氯化物-石墨插层化合物,为开发高性能储能材料提供了可行思路。
Metal chloride-intercalated graphite with excellent conductivity and a large interlayer spacing is highly desired for use in sodium ion batteries.However,halogen vapor is usually indispensable in initiating the intercalation process,which makes equip-ment design and experiments challenging.In this work,SO_(2)Cl_(2)was used as a chlorine generator to intensify the intercalation of BiCl_(3)into graphite(BiCl_(3)-GICs),which avoided the potential risks,such as Cl_(2)leakage,in traditional methods.The operational efficiency in the experiment was also improved.After the reaction of SO_(2)Cl_(2),BiCl_(3),and graphite at 200℃for 20 h,the synthesized BiCl_(3)-GICs had a large interlayer spacing(1.26 nm)and a high amount of BiCl_(3)intercalation(42%),which gave SIBs a high specific capacity of 213 mAh g^(-1)at 1 A g^(-1)and an excellent rate performance(170 mAh g^(-1)at 5 A g^(-1)).In-situ Raman spectra revealed that the electron-ic interaction between graphite and intercalated BiCl_(3)is weakened during the first discharge,which is favorable for sodium storage.This work broadly enables the increased intercalation of other metal chloride-intercalated graphites,offering possibilities for develop-ing advanced energy storage devices.
作者
兰淑琴
任伟成
王钊
于畅
余金河
刘迎宾
谢远洋
张秀波
王健健
邱介山
LAN Shu-qin;REN Wei-cheng;WANG Zhao;YU Chang;YU Jin-he;LIU Ying-bin;XIE Yuan-yang;ZHANG Xiu-bo;WANG Jian-jian;QIU Jie-shan(State Key Laboratory of Fine Chemicals,School of Chemical Engineering,Dalian University of Technology,Dalian 116024,China;College of Chemistry and Material Science,Shandong Agricultural University,Tai’an 271018,China;State Key Laboratory of Chemical Resource Engineering,College of Chemical Engineering,Beijing University of Chemical Technology,Beijing 100029,China)
出处
《新型炭材料(中英文)》
SCIE
EI
CAS
CSCD
北大核心
2024年第3期538-548,共11页
New Carbon Materials
基金
supported by the National Key Research and Development Program of China (2022YFB4101600)
the Fundamental Research Funds for the Central Universities (DUT22ZD207, DUT22LAB612)
the Shandong Provincial Natural Science Foundation (ZR2023QB095)。
关键词
磺酰氯
金属氯化物-石墨插层化合物
插层强化过程
负极材料
钠离子电池
Chlorine generator
Metal chloride-intercalated graphite
Intercalation intensification process
Anode material
Sodium-ion batteries