Zhou Cheng-Ao, Xia Xinhui, Wang Yadong, Yao Zhujun, Wu Jianbo, Wang Xiuli, Tu Jiangping
State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, School of Materials Science & Engineering, Zhejiang University, Hangzhou, 310027, China.
School of Engineering, Nanyang Polytechnic, 569830, Singapore.
Small. 2018 Apr;14(16):e1704339. doi: 10.1002/smll.201704339. Epub 2018 Mar 24.
High-performance of lithium-ion batteries (LIBs) rely largely on the scrupulous design of nanoarchitectures and smart hybridization of bespoke active materials. In this work, the pine-needle-like Cu-Co skeleton is reported to support highly active Li Ti O (LTO) forming Cu-Co/LTO core-branch arrays via a united hydrothermal-atomic layer deposition (ALD) method. ALD-formed LTO layer is uniformly anchored on the pine-needle-like heterostructured Cu-Co backbone, which consists of branched Co nanowires (diameters in 20 nm) and Cu nanowires (250-300 nm) core. The designed Cu-Co/LTO core-branch arrays show combined advantages of large porosity, high electrical conductivity, and good adhesion. Due to the unique positive features, the Cu-Co/LTO electrodes are demonstrated with enhanced electrochemical performance including excellent high-rate capacity (155 mAh g at 20 C) and noticeable long-term cycles (144 mAh g at 20 C after 3000 cycles). Additionally, the full cell assembled with activated carbon positive electrode and Cu-Co/LTO negative electrode exhibits high power/energy densities (41.6 Wh kg at 7.5 kW kg ). The design protocol combining binder-free characteristics and array configuration opens a new door for construction of advanced electrodes for application in high-rate electrochemical energy storage.
锂离子电池（LIBs）的高性能很大程度上依赖于纳米结构的精心设计以及定制活性材料的智能杂化。在这项工作中，据报道，通过联合水热-原子层沉积（ALD）方法，松针状的Cu-Co骨架支撑形成了具有高活性的LiTi O（LTO），形成了Cu-Co/LTO核-枝阵列。ALD形成的LTO层均匀地锚定在由分支的Co纳米线（直径为20nm）和Cu纳米线（250-300nm）核心组成的松针状异质结构Cu-Co主链上。所设计的Cu-Co/LTO核-枝阵列展现出大孔隙率、高电导率和良好附着力的综合优势。由于这些独特的积极特性，Cu-Co/LTO电极表现出增强的电化学性能，包括优异的高倍率容量（在20C时为155mAh g）和显著的长期循环性能（在3000次循环后，在20C时为144mAh g）。此外，由活性炭正极和Cu-Co/LTO负极组装而成的全电池表现出高功率/能量密度（在7.5kW kg时为41.6Wh kg）。结合无粘结剂特性和阵列结构的设计方案为构建用于高倍率电化学储能的先进电极打开了一扇新的大门。
