CAS OpenIR  > 中科院上海应用物理研究所2011-2019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; Liu, XF
2019
Source PublicationADVANCED FUNCTIONAL MATERIALS
ISSN1616-301X
Volume29Issue:10Pages:
Subtype期刊论文
AbstractWhen 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.
KeywordLITHIUM-ION BATTERIES HIGH-ENERGY ELECTROCHEMICAL PERFORMANCE CHARGE-COMPENSATION POSITIVE ELECTRODE SPINEL METAL COATINGS PHASE SOFT
DOI10.1002/adfm.201806706
Indexed BySCI
Language英语
Citation statistics
Cited Times:15[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/31889
Collection中科院上海应用物理研究所2011-2019年
Affiliation1.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
Recommended Citation
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):—.
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