期刊
SMALL
卷 14, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.201704339
关键词
atomic layer deposition; core-branch arrays; lithium-ion batteries; lithium titanate; metal skeletons
类别
资金
- National Natural Science Foundation of China [51502263, 51772272, 51728204]
- Qianjiang Talents Plan D [QJD1602029]
- Key Laboratory of Engineering Dielectrics and Its Application (Harbin University of Science and Technology) [KF20171101]
- Ministry of Education Program for Innovative Research Team in University of Ministry of Education of China [IRT13037]
- Startup Foundation for Hundred-Talent Program of Zhejiang University
- Fundamental Research Funds for the Central Universities [2015XZZX010-02]
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 Li4Ti5O12 (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(-1) at 20 C) and noticeable long-term cycles (144 mAh g(-1) 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(-1) at 7.5 kW kg(-1)). 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.
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