Zhou Chencheng, Zhang Peilin, Liu Jinzhe, Zhou Jiaojiao, Wang Weiwei, Li Kuang, Wu Jing, Lei Yuchen, Chen Luyang
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
J Colloid Interface Sci. 2021 Apr;587:260-270. doi: 10.1016/j.jcis.2020.12.015. Epub 2020 Dec 9.
In order to cope with the problem of insufficient lithium metal reserves, sodium ion batteries (SIBs) are proposed and extensively studied for the next-generation batteries. In our work, hierarchical NiCoSe nanoneedles/nanosheets are deposited on the skeleton of N-doped three dimensional porous graphene (NPG) by a convenient solvothermal method and subsequent gas-phase selenization process. Compared with NiCoSe powder, the optimized NiCoSe/N-doped porous graphene composite (denoted as NCS@NPG) as self-supporting anode exhibits the excellent electrode activity for SIBs, with a specific capacity of 500 mAh/g and 257 mAh/g at a current density of 0.2 A/g and 6.4 A/g, respectively. The high specific capacity as well as rate capacity can be attributed to the three-dimensional graphene skeleton with high electrical conductivity and pore structure, which provides convenient ion and electron transmission channels.
为应对锂金属储量不足的问题，人们提出了钠离子电池（SIBs）并对其作为下一代电池进行了广泛研究。在我们的工作中，通过简便的溶剂热法和随后的气相硒化过程，将分级结构的NiCoSe纳米针/纳米片沉积在氮掺杂三维多孔石墨烯（NPG）的骨架上。与NiCoSe粉末相比，优化后的NiCoSe/氮掺杂多孔石墨烯复合材料（记为NCS@NPG）作为自支撑阳极，对钠离子电池表现出优异的电极活性，在电流密度为0.2 A/g和6.4 A/g时，比容量分别为500 mAh/g和257 mAh/g。高比容量以及倍率性能可归因于具有高电导率和孔隙结构的三维石墨烯骨架，其提供了便利的离子和电子传输通道。
