Controllable deposition of FeV_2S_4 in carbon fibers for sodium-ion storage with high capacity and long lifetime
Controllable deposition of FeV_2S_4 in carbon fibers for sodium-ion storage with high capacity and long lifetime
复制标题
FeV_2S_4在碳纤维中的可控沉积用于高容量和长寿命的钠离子存储
DOI：
10.1007/s40843-020-1542-8
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Zhang Ming
中科院分区：
文献类型：
--
作者：
Li Pengchao;Chen Changmiao;Ding Shuangshuang;Huang Zhao;He Hongcheng;Cai Mengqiu;Cai Yong;Zhang Ming
具有高比容量的金属硫化物在钠离子电池领域引起了广泛的关注。FeV_2S_4是一种典型的金属硫化物，体积变化大，稳定性低，容量衰减快。在氧化石墨烯（GO）的帮助下，将尺寸和分布可控的FeV_2S_4纳米颗粒包裹在碳纳米纤维（CNFs）中制备FeV_2S_4@GO@CNF。结果表明，FeV_2S_4@GO@CNF阳极的Na~+存储性能比表面颗粒较多的FeV_2S_4@CNF要好。通常，FeV_2S_4@GO@CNF在sib中经过200次循环（0.1 A g~(-1)）后容量可保持在411 mA h g~(-1)， 500次循环（1 A g~(-1)）后容量可保持在227 mA h g~（-1）。此外，在0°C下，经过150次循环（0.1 a g~(-1)）后，它们可以提供170.2 mA h g~（-1）的容量。此外，基于FeV_2S_4@GO@CNF阳极和Na_3V_2(PO_4)_3/C阴极的全电池在0.5 a g~（-1）下循环100次后获得了164 mA h g~（-1）的显著容量。FeV_2S_4@GO@CNF的高比容量和稳定性可归因于氧化石墨烯控制了FeV_2S_4纳米颗粒的尺寸及其在cnf中的分布，从而增强了FeV_2S_4@GO@CNF的稳定性。本研究可能为催化剂和电池中纳米颗粒- cnf复合材料的合成提供新的策略。
Metal sulfides with high specific capacities have drawn considerable attention in the field of sodium-ion batteries(SIBs).As a typical metal sulfide,FeV_2S_4 always suffers rapid decay of capacities because of its low stability arising from large volume change.FeV_2S_4 nanoparticles with controllable sizes and distribution are encapsulated in carbon nanofibers (CNFs) with the help of graphene oxide (GO) to fabricate FeV_2S_4@GO@CNF.As a result,FeV_2S_4@GO@CNF anodes show enhanced electrochemical performances for Na~+ storage when compared with FeV_2S_4@CNF with more particles on the surface.Typically,the capacity of FeV_2S_4@GO@CNF can be maintained at 411 mA h g~(-1) after 200 cycles (0.1 A g~(-1)) and 227 mA h g~(-1) over 500 cycles (1 A g~(-1)) in SIBs.Moreover,they can deliver a capacity of 170.2 mA h g~(-1) after 150 cycles(0.1 A g~(-1)) at 0°C.In addition,full cells based on FeV_2S_4@GO@CNF anodes and Na_3V_2(PO_4)_3/C cathodes achieve a remarkable capacity of 164 mA h g~(-1) after 100 cycles at 0.5 A g~(-1).The high specific capacities and stability of FeV_2S_4@GO@CNF can be attributed to GO,which controls the size of FeV_2S_4 nanoparticles and their distribution in CNFs,resulting in the enhanced stability of FeV_2S_4@GO@CNF.This study may provide a new strategy for the synthesis of nanoparticle-CNF composites in catalysts and batteries.