Tuning Anionic Redox Activity and Reversibility for a High-Capacity Li-Rich Mn-Based Oxide Cathode via an Integrated Strategy

doi:10.1002/adfm.201806706

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Tuning Anionic Redox Activity and Reversibility for a High-Capacity Li-Rich Mn-Based Oxide Cathode via an Integrated Strategy
	Li, QY ; Zhou, D ; Zhang, LJ ; Ning, D ; Chen, ZH ; Xu, ZJ ; Gao, R ; Liu, XZ ; Xie, DH ; Schumacher, G
刊名	ADVANCED FUNCTIONAL MATERIALS
	2019
卷号	29 期号:10 页码:—
关键词	LITHIUM-ION BATTERIES HIGH-ENERGY ELECTROCHEMICAL PERFORMANCE CHARGE-COMPENSATION POSITIVE ELECTRODE SPINEL METAL COATINGS PHASE SOFT
ISSN号	1616-301X
DOI	10.1002/adfm.201806706
文献子类	期刊论文
英文摘要	When fabricating Li-rich layered oxide cathode materials, anionic redox chemistry plays a critical role in achieving a large specific capacity. Unfortunately, the release of lattice oxygen at the surface impedes the reversibility of the anionic redox reaction, which induces a large irreversible capacity loss, inferior thermal stability, and voltage decay. Therefore, methods for improving the anionic redox constitute a major challenge for the application of high-energy-density Li-rich Mn-based cathode materials. Herein, to enhance the oxygen redox activity and reversibility in Co-free Li-rich Mn-based Li1.2Mn0.6Ni0.2O2 cathode materials by using an integrated strategy of Li2SnO3 coating-induced Sn doping and spinel phase formation during synchronous lithiation is proposed. As an Li+ conductor, a Li2SnO3 nanocoating layer protects the lattice oxygen from exposure at the surface, thereby avoiding irreversible oxidation. The synergy of the formed spinel phase and Sn dopant not only improves the anionic redox activity, reversibility, and Li+ migration rate but also decreases Li/Ni mixing. The 1% Li2SnO3-coated Li1.2Mn0.6Ni0.2O2 delivers a capacity of more than 300 mAh g(-1) with 92% Coulombic efficiency. Moreover, improved thermal stability and voltage retention are also observed. This synergic strategy may provide insights for understanding and designing new high-performance materials with enhanced reversible anionic redox and stabilized surface lattice oxygen.
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31889]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Univ Chinese Acad Sci, Ctr Mat Sci & Optoelect Engn, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China; 2.Helmholtz Ctr Berlin Mat & Energy, Hahn Meitner Pl 1, D-14109 Berlin, Germany; 3.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China
推荐引用方式 GB/T 7714	Li, QY,Zhou, D,Zhang, LJ,et al. Tuning Anionic Redox Activity and Reversibility for a High-Capacity Li-Rich Mn-Based Oxide Cathode via an Integrated Strategy[J]. ADVANCED FUNCTIONAL MATERIALS,2019,29(10):—.
APA	Li, QY.,Zhou, D.,Zhang, LJ.,Ning, D.,Chen, ZH.,...&Liu, XF.(2019).Tuning Anionic Redox Activity and Reversibility for a High-Capacity Li-Rich Mn-Based Oxide Cathode via an Integrated Strategy.ADVANCED FUNCTIONAL MATERIALS,29(10),—.
MLA	Li, QY,et al."Tuning Anionic Redox Activity and Reversibility for a High-Capacity Li-Rich Mn-Based Oxide Cathode via an Integrated Strategy".ADVANCED FUNCTIONAL MATERIALS 29.10(2019):—.