U.S. Department of Energy Office of Scientific and Technical Information
Ultrafast Heterogeneous Nucleation Enables a Hierarchical Surface Configuration of Lithium‐Rich Layered Oxide Cathode Material for Enhanced Electrochemical Performances
Advanced Li‐ion Battery Engineering Laboratory and Key Laboratory of Graphene Technologies and Applications of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China, College of Materials Science and Opto‐Electronic Technology University of Chinese Academy of Sciences Beijing 100049 P. R. China
Advanced Li‐ion Battery Engineering Laboratory and Key Laboratory of Graphene Technologies and Applications of Zhejiang Province Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo 315201 P. R. China
i‐Lab Suzhou Institute of Nano‐Tech and Nano‐Bionics Chinese Academy of Sciences Suzhou 215123 P. R. China
Lithium‐rich layered oxides have attracted much attention for the high energy density, but they still suffer from cycling degradation and sluggish kinetic capability. In the present study, a novel modification of Li 1.143 Mn 0.544 Ni 0.136 Co 0.136 O 2 sphere cathode materials by a hierarchical surface configuration is proposed, which integrates advantages of dual oxide layers of both amorphous and nanocrystalline Al 2 O 3, as well as an inner spinel membrane. Mainly promoted by an ultrafast heterogeneous nucleation of Al(NO) 3 nanoseeds caused by huge solubility differences, it only takes several minutes for pretreatment. After common annealing at low temperature, the obtained material is capable to deliver a high discharge capacity of 296.3 mAh g −1 with initial Coulombic efficiency of 92.9% at 0.1 C rate, and maintain stable cycling at both 0.2 and 0.5 C rates. Besides, rate performances are also enhanced as a result of the superior interface gained after surface modification, which produces reduced polarization during cycling. Through comprehensive analyses, improved surface property and stability are confirmed as the key to these enhancements. This strategy is anticipated to inspire new modification designs in future high energy density cathode materials.
@article{osti_1424808,
author = {Guo, Haocheng and Jia, Kai and Han, Shaojie and Zhao, Hu and Qiu, Bao and Xia, Yonggao and Liu, Zhaoping},
title = {Ultrafast Heterogeneous Nucleation Enables a Hierarchical Surface Configuration of Lithium‐Rich Layered Oxide Cathode Material for Enhanced Electrochemical Performances},
annote = {Abstract Lithium‐rich layered oxides have attracted much attention for the high energy density, but they still suffer from cycling degradation and sluggish kinetic capability. In the present study, a novel modification of Li 1.143 Mn 0.544 Ni 0.136 Co 0.136 O 2 sphere cathode materials by a hierarchical surface configuration is proposed, which integrates advantages of dual oxide layers of both amorphous and nanocrystalline Al 2 O 3, as well as an inner spinel membrane. Mainly promoted by an ultrafast heterogeneous nucleation of Al(NO) 3 nanoseeds caused by huge solubility differences, it only takes several minutes for pretreatment. After common annealing at low temperature, the obtained material is capable to deliver a high discharge capacity of 296.3 mAh g −1 with initial Coulombic efficiency of 92.9% at 0.1 C rate, and maintain stable cycling at both 0.2 and 0.5 C rates. Besides, rate performances are also enhanced as a result of the superior interface gained after surface modification, which produces reduced polarization during cycling. Through comprehensive analyses, improved surface property and stability are confirmed as the key to these enhancements. This strategy is anticipated to inspire new modification designs in future high energy density cathode materials. },
doi = {10.1002/admi.201701465},
url = {https://www.osti.gov/biblio/1424808},
journal = {Advanced Materials Interfaces},
issn = {ISSN 2196-7350},
number = {11},
volume = {5},
place = {Germany},
publisher = {Wiley Blackwell (John Wiley & Sons)},
year = {2018},
month = {03}}