新型炭材料2023，Vol.38Issue(1)：190-199,10.DOI:10.1016/S1872-5805(22)60596-1
利用Se―C键将硒包封于蜂窝状三维多孔炭构筑高性能锂-硒电池正极材料
Se with Se-C bonds encapsulated in a honeycomb 3D porous carbon as an excellent performance cathode for Li-Se batteries
摘要
Abstract
Li-Se batteries have risen to prominence as promising lithium-ion batteries thanks to their ultrahigh volumetric energy density and the high electrical conductivity of Se.However,the use of Li-Se batteries is limited not only by the large volume expan-sion and dissolution of polyselenides in the cathodes during cycling,but also the low selenium loading.A highly effective and cur-rently feasible approach to simultaneously tackle these problems is to position the selenium in a carbon matrix with a sufficient pore volume to accommodate the expansion while increasing the interfacial interaction between the selenium and carbon.We have syn-thesized a novel cathode material(Se@HPC)for Li-Se batteries of a honeycomb 3D porous carbon derived from a tartrate salt,that was impregnated with Se to produce Se-C bonds.The pore volume of the honeycomb 3D porous carbon was as high as 1.794 cm3 g?1,which allowed 65 wt%selenium to be uniformly encapsulated.Moreover,the strong chemical bonds between seleni-um and carbon stabilize the selenium,thus inhibiting its huge volume expansion and the dissolution of polyselenides,and promoting charge transfer during cycling.As expected,a Se@HCP cathode has excellent cyclability and a good rate performance.After 200 cycles at 0.2 C,its specific capacity remains at 561 mA h g?1,83%of the theoretical value,and decays by only 0.058%per cycle.It also has a large capacity of 472.8 mA h g?1 under a high current density of 5 C.关键词
锂-硒电池/正极/蜂窝状三维多孔炭/高负载/Se―C键Key words
Li-Se batteries/Cathodes/Honeycomb 3D porous carbon/High loading/Se―C bonds分类
化学化工引用本文复制引用
夏志刚,张晶晶,范美强,吕春菊,陈智,李超..利用Se―C键将硒包封于蜂窝状三维多孔炭构筑高性能锂-硒电池正极材料[J].新型炭材料,2023,38(1):190-199,10.基金项目
The authors are very grateful for the financial support from the project of the Fundamental Research Funds for the Provincial Universities of Zhejiang(2021YW51).浙江省属高校基本科研业务费专项资金(2021YW51). （2021YW51）
