Mn3O4@ZnO核壳结构纳米片阵列的可控合成及其在水系锌离子电池中的应用  

Controlled Synthesis of Core-shell Structured Mn3O4@ZnO Nanosheet Arrays for Aqueous Zinc-ion Batteries

作　　者：李孟夏 陆越 王利斌 胡先罗[1] LI Meng-Xia;LU Yue;WANG Li-Bin;HU Xian-Luo(School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;China-EU Institute for Clean and Renewable Energy,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学材料科学与工程学院,武汉430074 [2]华中科技大学中欧清洁与可再生能源学院,武汉430074

出　　处：《无机材料学报》2020年第1期86-92,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(51772116)~~

摘　　要：锰基氧化物是一类非常有潜力的水系锌离子电池正极材料,但是在充放电循环过程中面临结构坍塌而导致容量快速衰减。本研究结合微波水热法和原子层沉积法在碳布上构筑了具有核壳结构的Mn3O4@ZnO纳米片阵列,经优化ZnO的包覆厚度后,Mn3O4充放电100个循环的容量保持率可以提高至60.3%。ZnO包覆层可以有效维持Mn3O4的结构稳定性,并且避免其与电解液直接接触而被腐蚀溶解,从而改善材料的储锌电化学性能。这种核壳状结构的设计为发展高性能水系锌离子电池锰基氧化物正极材料提供了一种有效的思路。Manganese-based oxides are promising cathode materials for zinc-ion batteries.However,these materials often suffer from rapid capacity fade due to structure collapse during charge and discharge processes.Here,we report that core-shell structured Mn3O4@ZnO nanosheet arrays are synthesized on the carbon cloth,combining microwave hydrothermal process with atomic layer deposition.With an optimized thickness of ZnO coating layer,the capacity retention of the as-formed Mn3O4@ZnO nanosheet arrays exhibits 60.3%over 100 discharge-charge cycles at a current density of 100 mA·g−1.It is demonstrated that the introduction of ZnO layers is beneficial to maintain the microstructure and improve the structural stability of the Mn3O4 electrode material during the discharge-charge process,benefiting from avoiding direct contact with the electrolyte.The design of the well-defined core-shell structure provides an effective way to develop high-performance manganese-based oxide cathode materials for zinc-ion batteries.

关 键 词：核壳结构 锰基氧化物 原子层沉积 微波水热法 水系锌离子电池 

分 类 号：TB321[一般工业技术—材料科学与工程]