Core/Double-Shell Type Gradient Ni-Rich LiNi0.76Co0.10Mn0.14O2 with High Capacity and Long Cycle Life for Lithium-Ion Batteries

Jin-Yun Liao; Seung-Min Oh; Arumugam Manthiram

doi:10.1021/acsami.6b06172

Core/Double-Shell Type Gradient Ni-Rich LiNi0.76Co0.10Mn0.14O2 with High Capacity and Long Cycle Life for Lithium-Ion Batteries

ACS Appl Mater Interfaces. 2016 Sep 21;8(37):24543-9. doi: 10.1021/acsami.6b06172. Epub 2016 Sep 9.

Authors

Jin-Yun Liao¹, Seung-Min Oh¹, Arumugam Manthiram¹

Affiliation

¹ Materials Science and Engineering Program and Texas Materials Institute, The University of Texas at Austin , Austin, Texas 78712, United States.

PMID: 27571031
DOI: 10.1021/acsami.6b06172

Abstract

A concentration-gradient Ni-rich LiNi0.76Co0.1Mn0.14O2 layered oxide cathode has been developed by firing a core/double-shell [Ni0.9Co0.1]0.4[Ni0.7Co0.1Mn0.2]0.5[Ni0.5Co0.1Mn0.4]0.1(OH)2 hydroxide precursor with LiOH·H2O, where the Ni-rich interior (core) delivers high capacity and the Mn-rich exterior (shells) provides a protection layer to improve the cyclability and thermal stability for the Ni-rich oxide cathodes. The content of nickel and manganese, respectively, decreases and increases gradually from the center to the surface of each gradient sample particle, offering a high capacity with enhanced surface/structural stability and cyclability. The obtained concentration-gradient oxide cathode exhibits high-energy density with long cycle life in both half and full cells. With high-loading electrode half cells, the concentration-gradient sample delivers 3.3 mA h cm(-2) with 99% retention after 100 cycles. The material morphology, phase, and gradient structure are also maintained after cycling. The pouch-type full cells fabricated with a graphite anode delivers high capacity with 89% capacity retention after 500 cycles at C/3 rate.

Keywords: concentration-gradient oxides; core/double-shell structure; high-loading electrodes; layered oxide cathode; lithium-ion batteries; nickel-rich oxide.