New Insight into the Role of Mn Doping on the Bulk Structure Stability and Interfacial Stability of Ni-Rich Layered Oxide

被引:16
|
作者
Li, Wenjin [1 ,2 ,3 ]
Zhuang, Weidong [1 ,3 ]
Gao, Min [2 ]
Zhou, Yunan [4 ,5 ]
Zhang, Jian [6 ]
Li, Ning [2 ]
Liu, Xianghuan [1 ,2 ,3 ]
Huang, Wei [1 ,2 ,3 ]
Lu, Shigang [1 ,2 ,3 ]
机构
[1] Grinm Grp Co Ltd, Natl Power Battery Innovat Ctr, Beijing 100088, Peoples R China
[2] China Automot Battery Res Inst Co Ltd, Beijing 101407, Peoples R China
[3] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China
[4] Tsinghua Shenzhen Int Grad Sch, Shenzhen Key Lab Power Battery Safety Res, Shenzhen 518055, Peoples R China
[5] Tsinghua Shenzhen Int Grad Sch, Shenzhen Geim Graphene Ctr, Shenzhen 518055, Peoples R China
[6] Univ Sci & Technol Beijing, Sch Met & Ecol Engn, Beijing 100083, Peoples R China
基金
中国国家自然科学基金;
关键词
Ni-rich layered oxide; Mn doping; Rock salt phase; Fading mechanism; Cycling performance; LITHIUM-ION BATTERIES; TRANSITION-METAL OXIDE; CATHODE MATERIAL; HIGH-ENERGY; ELECTROCHEMICAL PROPERTIES; CYCLING PERFORMANCE; CONCENTRATION GRADIENT; SURFACE; DEGRADATION; STORAGE;
D O I
10.1002/cnma.201900640
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Nickel-rich layered oxides have developed into appealing cathode materials for lithium-ion batteries in recent years for the sake of high energy density and low cost, but they suffer from severe capacity deterioration during long-term cycling. Herein, Mn-doped nickel-rich Li(Ni0.88Co0.09Al0.03)(1-delta)Mn delta O2 (delta=0, 0.01, 0.02) cathode materials with a nanoscale NixMn1-xO-type pillar layer are synthesized using a facile high-shear dry mixing and high-temperature calcination process in this study. The as-fabricated M0.01-NCA electrode with a NixMn1-xO-type layer about 20 nm exhibits excellent cycle performance compared with the pristine in coin-cells and in pouch cells (the long-term cycle number is four times that of the pristine). Detailed investigation of the fading mechanism is performed by HRTEM, ex-situ XRD, XPS et al. The enhanced performance is directly related to the synergetic effects of bulk inactive Mn4+ doping and the increased nanoscale NixMn1-xO-type pillar layer. The Mn dopants stabilize the lattice structure thus decreasing the microcracks, and the pillar layer protects the cathode from parasitic reactions with electrolytes during long-term cycling. This work gives a new insight into the role of Mn doping on the enhanced structure of nickel-rich layered oxides.
引用
收藏
页码:451 / 460
页数:10
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