title: An Effectively Activated Hierarchical Nano-/Microspherical Li1.2Ni0.2Mn0.6O2 Cathode for Long-Life and High-Rate Lithium-Ion Batteries.
abstract: Rechargeable lithium-ion batteries with high energy and high power density are required in the application of electric vehicles and portable electronics. Herein, we introduce a type of spherical Li-rich cathode material, Li1.2Ni0.2Mn0.6O2, assembled from uniform nanocubes by a facile polyvinylpyrrolidone (PVP)-assisted hydrothermal method. The material with a hierarchical nano-/microstructure exhibits stable high-rate performance. Furthermore, the precipitant (i.e., urea) and the structure-directing agent (i.e., PVP) effectively activated the Li2 MnO3 components in the microscale material to achieve a high specific capacity of 298.5 mAh g(-1) in the first cycle. This Li-rich cathode material still delivered 243 mAh g(-1) at 0.1 C after 200 cycles and the capacity retentions at 0.5, 1, 2, and 5 C were 94.4, 78.7, 76.3, and 67.8% after 150 cycles, respectively. The results make this Li-rich nano-/microstructure a promising cathode material for long-life and high-performance lithium-ion batteries.
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Li
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China. membrane@bit.edu.cn.|Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081, P.R. China. membrane@bit.edu.cn.
authors.forename: Ying
authors.initials: Y
authors.lastname: Bai
authors.affiliation: Chemical Sciences and Engineering Division, 9700 South Cass Avenue, Lemont, IL, 60439, USA.
authors.forename: Xuanxuan
authors.initials: X
authors.lastname: Bi
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.
authors.forename: Ji
authors.initials: J
authors.lastname: Qian
authors.affiliation: X-ray Sciences Division, 9700 South Cass Avenue, Lemont, IL, 60439, USA.
authors.forename: Lu
authors.initials: L
authors.lastname: Ma
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.
authors.forename: Jun
authors.initials: J
authors.lastname: Tian
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.|Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081, P.R. China.
authors.forename: Chuan
authors.initials: C
authors.lastname: Wu
authors.affiliation: Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science and Engineering, Beijing Institute of Technology, Beijing, 100081, P.R. China.|Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing, 100081, P.R. China.
authors.forename: Feng
authors.initials: F
authors.lastname: Wu
authors.affiliation: Chemical Sciences and Engineering Division, 9700 South Cass Avenue, Lemont, IL, 60439, USA. junlu@anl.gov.
authors.forename: Jun
authors.initials: J
authors.lastname: Lu
authors.affiliation: Chemical Sciences and Engineering Division, 9700 South Cass Avenue, Lemont, IL, 60439, USA.
authors.forename: Khalil
authors.initials: K
authors.lastname: Amine
mesh_terms: D011211:Electric Power Supplies; D004566:Electrodes; D008094:Lithium / Q000737:chemistry*; D008345:Manganese / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D009532:Nickel / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D014961:X-Ray Diffraction
chemical_list: D008345:Manganese; D009532:Nickel; D008094:Lithium
keywords: electrochemistry; energy storage; hierarchical structures; lithium; lithium-ion batteries