The Role of Zr Doping in Stabilizing Li[Ni 0.6 Co 0.2 Mn 0.2 ]O 2 as a Cathode Material for Lithium-Ion Batteries

Ni-rich layered LiNi Co Mn O systems are the most promising cathode materials for high energy density Li-ion batteries (LIBs). However, Ni-rich cathode materials inevitably suffer from rapid capacity fading and poor rate capability owing to structural instability and unstable surface side reactions....

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Published in:ChemSusChem 2019-06, Vol.12 (11), p.2439-2446
Main Authors: Choi, Jonghyun, Lee, Seung-Yong, Yoon, Sangmoon, Kim, Kyeong-Ho, Kim, Miyoung, Hong, Seong-Hyeon
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cited_by cdi_FETCH-LOGICAL-c192t-16e0ebc2cc68c1a188cb3b895d629319f5f9a27821795342f422de50a7ebf983
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container_end_page 2446
container_issue 11
container_start_page 2439
container_title ChemSusChem
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creator Choi, Jonghyun
Lee, Seung-Yong
Yoon, Sangmoon
Kim, Kyeong-Ho
Kim, Miyoung
Hong, Seong-Hyeon
description Ni-rich layered LiNi Co Mn O systems are the most promising cathode materials for high energy density Li-ion batteries (LIBs). However, Ni-rich cathode materials inevitably suffer from rapid capacity fading and poor rate capability owing to structural instability and unstable surface side reactions. Zr doping has proven to be an effective method to enhance the cycle and rate performances by stabilizing the structure and increasing the Li diffusion rate. Herein, effects of Zr-doping on the structural stability and Li diffusion kinetics are thoroughly investigated in LiNi Co Mn O (LNCM) cathode material using atomic-resolution scanning transmission electron microscopy imaging, XRD Rietveld refinement, and density functional theory calculations. Zr doping mitigates the degree of cation mixing, decreases the structural transformation, and facilitates Li diffusion resulting in improved cyclic performance and rate capability. Based on the obtained results, an atomistic model is proposed to explain the effects of Zr doping on the structural stability and Li diffusion kinetics in LNCM cathode materials.
doi_str_mv 10.1002/cssc.201900500
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title The Role of Zr Doping in Stabilizing Li[Ni 0.6 Co 0.2 Mn 0.2 ]O 2 as a Cathode Material for Lithium-Ion Batteries
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