Growth mechanisms for spherical Ni_(0.815)Co_(0.15)Al_(0.035)(OH)_(2) precursors prepared via the ammonia complexation precipitation method  

作　　者：Xi Yang Xuesong Huang Hancheng Shi Peng Dong Ding Wang Jianguo Duan Yingjie Zhang 

机构地区：[1]Nationl and Localfoint Enginering Laboratory for lithium-ion Batteres and Materials Ppreparation Techmology,Key Laboratory of Advanced Batrery Materas of Yunnan Province,Faculty of Metalturgical and Energy Engineering,Kunming University of Science and Technology,Kurnming 650093,Yunnan,China

出　　处：《Journal of Energy Chemistry》2021年第2期379-386,I0013,共9页能源化学（英文版）

基　　金：financial support from the National Natural Science Foundation of China (No. 51904135, 51804149, 51764029);the Scientific Research Fundation of Yunnan Provincial Department of Education (No. 2019J0032);the Applied Basic Research Fundation of Yunnan Province (No. 2019FB076, 2018FD039);the Scientific Research Fund of High-end Talents Introduction of Kunming University of Science and Technology (No. KKKP201752022)。

摘　　要：The microstructures of precursors strongly affect the electrochemical performance of Ni-rich layerstructured cathode materials.In this study,the growth behaviour of Ni_(0.815)Co_(0.15)Al_(0.035)(OH)_2(NCA) prepared via the ammonia complexation precipitation method in a 50-L-volume continuously stirred tank reactor(CSTR) is studied in detail.The growth of Ni(OH)2-based hydroxide can be divided into a nucleation process,an agglomeration growth process,a process in which multiple growth mechanisms coexist,and an interface growth process over time,while the inner structure of the CSTR can be divided into a nucleation zone,a complex dissolution zone,a growth zone,and a maturation zone.The concentration of ammonium ions affects the growth habit of the primary crystal significantly due to its specific adsorption on the electronegative crystal plane.When the ammonia concentration is <1.5 mol L^(-1) at 60℃ at pH=11.5,the precursors grow preferentially along the(1 0 1) crystal plane,whereas they grow preferentially along the(0 0 1) crystal plane when the concentration is >2.0 mol L^(-1).The LiNi_(0.815)Co_(0.15)Al_(0.035)O_2 materials inherit the grain structure of the precursor.Materials prepared from precursors with(1 0 1)preferential primary particles show a higher specific capacity and better rate performance than those that were prepared from(0 0 1) preferential primary particles,but the latter realize a better cycling performance than the former.

关 键 词：Lithium ion batteries Growth mechanism Spherical agglomerates Mixed hydroxide LiNi_(0.815)Co_(0.15)Al_(0.035)O_(2) 

分 类 号：TQ138.13[化学工程—无机化工]