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A Novel Perovskite Electron–Ion Conductive Coating to Simultaneously Enhance Cycling Stability and Rate Capability of Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 Cathode Material for Lithium‐Ion Batteries
Author(s) -
Gao Mingxi,
Yan Chenhui,
Shao Qig,
Chen Jian,
Zhang Chenyang,
Chen Gairong,
Jiang Yinzhu,
Zhu Tiejun,
Sun Wenping,
Liu Yongfeng,
Gao Mingxia,
Pan Hongge
Publication year - 2021
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.202008132
Subject(s) - materials science , conductivity , coating , lithium (medication) , perovskite (structure) , ion , cathode , ionic conductivity , analytical chemistry (journal) , diffusion , dissolution , cycling , ionic radius , chemical engineering , nanotechnology , electrolyte , electrode , chemistry , thermodynamics , medicine , history , physics , organic chemistry , chromatography , archaeology , endocrinology , engineering
Poor cycling stability and rate capability are two key issues needing to be solved for Li‐ and Mn‐rich oxide cathode material for lithium‐ion batteries (LIBs). Herein, a novel perovskite electron–ion mixed conductor Nd 0.6 Sr 0.4 CoO 3 (NSCO) is used as the coating layer on Li 1.2 Ni 0.13 Co 0.13 Mn 0.54 O 2 (LNCMO) to simultaneously enhance its cycling stability and rate capability. By coating 3 wt% NSCO, LNCMO–3NSCO exhibits an optimal cycling performance with a capacity retention of 99% at 0.1C (1C = 200 mA g −1 ) after 60 cycles, 91% at 1C after 300 cycles, and 54% at 20C after 1000 cycles, much better than 78%, 63%, and 3% of LNCMO, respectively. Even at a high charge and discharge rate of 50C, LNCMO–3NSCO exhibits a discharge capacity of 53 mAh g −1 and a mid‐point discharge voltage of 2.88 V, much higher than those of LNCMO (24 mA h g −1 and 2.40 V, respectively). Benefiting from the high electronic conductivity (1.46 S cm −1 ) and ionic conductivity (1.48 × 10 −7 S cm −1 ), NSCO coating not only suppresses transition metals dissolution and structure transformation, but also significantly enhances electronic conductivity and Li + diffusion coefficient of LNCMO by an order of magnitude.