title: The Effect of Boron Doping on Structure and Electrochemical Performance of Lithium-Rich Layered Oxide Materials.
abstract: Polyanion doping shows great potential to improve electrochemical performance of Li-rich layered oxide (LLO) materials. Here, by optimizing the doping content and annealing temperature, we obtained boron-doped LLO materials Li1.2Mn0.54Ni0.13Co0.13BxO2 (x = 0.04 and 0.06) with comprehensively improved performance (94% capacity retention after 100 cycles at 60 mA/g current density and a rate capability much higher compared to that of the pristine sample) at annealing temperatures of 750 and 650 °C, respectively, which are much lower than the traditional annealing temperature of similar material systems without boron. The scenario of the complex crystallization process was captured using Cs-corrected high-angle annular dark field scanning transmission electron microscopic (HAADF-STEM) imaging techniques. The existence of layered, NiO-type, and spinel-like structures in a single particle induced by boron doping and optimization of annealing temperature is believed to contribute to the remarkable improvement of cycling stability and rate capability.
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, P.R. China.
authors.forename: Jiatu
authors.initials: J
authors.lastname: Liu
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microctructures, Nanjing University , Nanjing 210023, P.R. China.
authors.forename: Shuangbao
authors.initials: S
authors.lastname: Wang
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, P.R. China.
authors.forename: Zhengping
authors.initials: Z
authors.lastname: Ding
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, P.R. China.
authors.forename: Ruiqi
authors.initials: R
authors.lastname: Zhou
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, P.R. China.
authors.forename: Qingbing
authors.initials: Q
authors.lastname: Xia
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, P.R. China.
authors.forename: Jinfang
authors.initials: J
authors.lastname: Zhang
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, P.R. China.
authors.forename: Libao
authors.initials: L
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, P.R. China.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Wei
authors.affiliation: National Laboratory of Solid State Microstructures, College of Engineering and Applied Sciences and Collaborative Innovation Center of Advanced Microctructures, Nanjing University , Nanjing 210023, P.R. China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wang
keywords: HAADF-STEM; annealing temperature; boron doping; cathode materials; complex crystallization; lithium-rich layered oxide