Observation of Pseudocapacitive Effect and Fast Ion Diffusion in Bimetallic Sulfides as an Advanced Sodium-Ion Battery Anode
Observation of Pseudocapacitive Effect and Fast Ion Diffusion in Bimetallic Sulfides as an Advanced Sodium-Ion Battery Anode
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观察双金属硫化物作为先进钠离子电池阳极的赝电容效应和快速离子扩散
DOI：
10.1002/aenm.201703155
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发表时间：
2018-07-05
影响因子：
27.8
通讯作者：
Liang, Shuquan
中科院分区：
文献类型：
--
作者：
Fang, Guozhao;Wu, Zhuoxi;Liang, Shuquan
钠离子电池（SIBs）因其低成本和丰富的钠源而成为有前途的下一代替代方案。然而，在sib（如过渡金属硫化物）中发育的电极具有体积膨胀大、Na+扩散动力学缓慢和导电性差的缺点。本文研究了嵌套在空心氮掺杂碳纳米片中的双金属硫化物（Co9S8/ZnS）纳米晶体具有高钠扩散系数、赝电容效应和优异的可逆性。这种独特的复合结构是通过cozn - mof的易硫化和煅烧来设计和合成的，并且高度依赖于反应时间和温度。优化后的Co1Zn1-S（600）电极具有优异的储钠性能，包括在0.1 ag（-1）时具有542 mA h g（-1）的高容量，在10 ag（-1）时具有良好的倍率能力，以及在半电池中高达500次循环的优异循环稳定性。它也显示出在全电池配置下的潜力。这种能力将加速钠离子电池在电能应用中的应用。
Sodium-ion batteries (SIBs) are promising next-generation alternatives due to the low cost and abundance of sodium sources. Yet developmental electrodes in SIBs such as transition metal sulfides have huge volume expansion, sluggish Na+ diffusion kinetics, and poor electrical conductivity. Here bimetallic sulfide (Co9S8/ZnS) nanocrystals embedded in hollow nitrogen-doped carbon nanosheets are demonstrated with a high sodium diffusion coefficient, pseudocapacitive effect, and excellent reversibility. Such a unique composite structure is designed and synthesized via a facile sulfidation of the CoZn-MOFs followed by calcination and is highly dependant on the reaction time and temperature. The optimized Co1Zn1-S(600) electrode exhibits excellent sodium storage performance, including a high capacity of 542 mA h g(-1) at 0.1 A g(-1), good rate capability at 10 A g(-1), and excellent cyclic stability up to 500 cycles for half-cell. It also shows potential in full-cell configuration. Such capabilities will accelerate the adoption of sodium-ion batteries for electrical energy applications.