Synthesis of Honeycomb-Like Co 3 S 4 /MoS 2 Composites with Hollow Structure As Anode Materials for High-Performance Lit
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https://doi.org/10.1007/s11664-020-08425-y 2020 The Minerals, Metals & Materials Society
Synthesis of Honeycomb-Like Co3S4/MoS2 Composites with Hollow Structure As Anode Materials for High-Performance Lithium-Ion and Sodium-Ion Batteries JIANYU LIU,1 DEMING LI,1 GAI YANG,2 FEIPENG CAI,2 and GUANGDA LI 1,3 1.—School of Materials Science and Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China. 2.—Energy Research Institute of Shandong Academy Sciences, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China. 3.—e-mail: [email protected]
Hollow honeycomb-like Co3S4/MoS2 composites were fabricated through the zeolitic imidazolate framework-67 (ZIF-67) as a precursor and followed by two sulfuration processes. Co3S4 hollow nanocubes were first prepared using ZIF67 and thioacetamide co-pyrolysis. Then, MoS2 nanosheets were grown on the surface of Co3S4 nanocubes and formed Co3S4/MoS2 hollow composites. The outside flake-like MoS2 interlaced together, thus formed a honeycomb-like structure. The combination of Co3S4 and MoS2 significantly improved the electrochemical performance compared with single Co3S4 or MoS2. The presence of honeycomb-like MoS2 not only stabilized the structure of inner Co3S4 nanocubes to the maximum extent during the discharge/charge process, but also supplied more Li+ and Na+ insertion/extraction sites, increased the contact area between electrode material and electrolyte, and restrained volume expansion of inner Co3S4 nanocubes. The capacity of the Co3S4/MoS2 was maintained at 365 mAh g1 during 1000 cycles at 1 A g1 when used as anode material in lithium-ion batteries. At even a higher current density of 2 A g1, the capacity of the Co3S4/MoS2 stabilized at 248 mAh g1 during 1000 cycles. When used as anode material in sodium-ion batteries, it still has a capacity of 230 mAh g1 at 1 A g1, which is superior to that of the single Co3S4 nanocubes. Co3S4/MoS2 composites exhibited enhanced capacity and excellent cycling performance due to its complementarity, hollow structure and synergetic effect between Co3S4 and MoS2. Key words: Lithium-ion battery, sodium-ion battery, anode, hollow structure, composite
INTRODUCTION Lithium-ion batteries (LIBs) have a wide application in portable electrical equipment because of their high energy density, no memory effect and long-term cycle life.1–6 At present, due to the price
(Received May 11, 2020; accepted August 14, 2020)
and resource constraints of Li, there has also been research focus on sodium-ion batteries (SIBs).7–11 Sodium and lithium are in the same main-group and have similar physical and chemical properties. Because sodium is abundant and low in price, SIBs have become the best alternative to lithium-ion batteries. However, the radius of Na+ is larger than that of Li+, which results in the low specific capacity and poor cycle stability of SIBs. Therefore, the widespread application of LIBs forces development of anode materials with convenient Li+/Na+ storage and large theoretic
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