Utilizing fast ion conductor for single-crystal Ni-rich cathodes to achieve dual-functional modification of conductor network constructing and near-surface doping

doi:10.1016/j.ensm.2022.07.029

CORC > 兰州理工大学 > 兰州理工大学 > 石油化工学院

	Utilizing fast ion conductor for single-crystal Ni-rich cathodes to achieve dual-functional modification of conductor network constructing and near-surface doping
	Zhou, Xin'an 2,3; Zhang, Feilong 2,3; Fu, Xiaolan 3; Zhang, Ningshuang 2,3; Huang, Jin 2,3; Cai, Xingpeng 2,3; Ding, Hao 2,3; Li, Baoqiang 2,3; Niu, Lei 3; Li, Shiyou 1,2,3
刊名	Energy Storage Materials
	2022-11-01
卷号	52 页码:19-28
关键词	Aluminum compounds Cathodes Crystal structure Density functional theory Doping (additives) Electric discharges Electrolytes Lanthanum compounds Lithium compounds Lithium-ion batteries Metal ions Network layers Nickel oxide Niobium Niobium compounds Sintering Cutoff voltage Dual-functional modification Fast-ion conductors Functional modification High cut-off voltage High-voltages Interfacial instability Lini0.8co0.15al0.05O2 Near surfaces Ni-rich cathode
DOI	10.1016/j.ensm.2022.07.029
英文摘要	Ni-rich transition metal oxides are regarded as appealing candidate cathodes for next-generation lithium batteries because of their high discharge capacity. Single-crystal is an effective means to restrain the formation of microcracks to improve the cyclic property of LiNi0.8Co0.15Al0.05O2 (NCA) materials. Nonetheless, critical structural and interfacial instabilities make single-crystal NCA cathodes hard to achieve ideal electrochemical performance at high voltage. Herein, the fast ion conductor Li5La3Nb2O12 with higher conductivity and wider electrochemical window was selected as the material to enhance the high voltage performances for single-crystal NCA. Interestingly, density functional theory calculations found that La and Nb have different distribution characteristics in NCA. Therefore, we take advantage of oxidation reaction and element diffusion during high temperature sintering to achieve dual-functional modification of La-rich conductor network constructing and near-surface Nb doping for single-crystal NCA material. Impressively, the modified electrodes exhibit excellent cycling performances with a retention of 82.9% after 500 cycles at 2.7–4.3 V and even outstanding stability under extended cutoff voltage as well as improved rate capabilities. Detailed study reveals that the doped Nb with stronger Nb-O bond can suppress the migration of transition metal ion, thus impeding the distortion of material structure. Meanwhile, surface ion-conductor network layer provides fast Li+ diffusion channels as well as protecting interface layer from electrolyte decomposition products. The facile approach of Li5La3Nb2O12 modification proposed in this manuscript is suitable to solve interfacial instability and structure stability for cathodes but not only for single-crystal NCA, which provides application hopes for high energy lithium-ion batteries. © 2022
语种	英语
出版者	Elsevier B.V.
内容类型	期刊论文
源URL	[http://ir.lut.edu.cn/handle/2XXMBERH/159405]
专题	石油化工学院新能源学院
作者单位	1.Gansu Engineering Laboratory of Cathode Material for Lithium-ion Battery, Baiyin; 730900, China 2.Key Laboratory of Low Carbon Energy and Chemical Engineering of Gansu Province, Lanzhou; 730050, China; 3.School of Petrochemical Technology, Lanzhou University of Technology, Lanzhou; 730050, China;
推荐引用方式 GB/T 7714	Zhou, Xin'an,Zhang, Feilong,Fu, Xiaolan,et al. Utilizing fast ion conductor for single-crystal Ni-rich cathodes to achieve dual-functional modification of conductor network constructing and near-surface doping[J]. Energy Storage Materials,2022,52:19-28.
APA	Zhou, Xin'an.,Zhang, Feilong.,Fu, Xiaolan.,Zhang, Ningshuang.,Huang, Jin.,...&Li, Shiyou.(2022).Utilizing fast ion conductor for single-crystal Ni-rich cathodes to achieve dual-functional modification of conductor network constructing and near-surface doping.Energy Storage Materials,52,19-28.
MLA	Zhou, Xin'an,et al."Utilizing fast ion conductor for single-crystal Ni-rich cathodes to achieve dual-functional modification of conductor network constructing and near-surface doping".Energy Storage Materials 52(2022):19-28.