Synergistic structure of LiFeO2 and Fe2O3 layers with electrostatic shielding effect to suppress surface lattice oxygen release of Ni-rich cathode

Chu，Youqi1,2,3; Mu，Yongbiao2,3; Zou，Lingfeng2,3; Cheng，Jie4; Xi，Shibo5; Pan，Qichang1; Han，Meisheng2,3; Wang，Hongqiang1; Li，Qingyu1; Zheng，Fenghua1; Zhang，Qing2,3; Zeng，Lin2,3

2023-06-01

10.1016/j.cej.2023.142750

Chemical Engineering Journal   Impact Factor & Quartile

1385-8947

The Ni-rich cathodes used for lithium-ion batteries (LIBs) suffer from severe surface side reactions, slow kinetics, and microcracks during long-term cycling. To address these problems, a dual-modified protective coating consisting of LiFeO&FeO layers (denoted as LFO) was fabricated on the surface of the cathode material LiNiCoMnO (NCM811) by capturing the lithium impurities in the electrolyte solution using an electric field. The LiFeO layer acts as an ionic conductor, accelerating interfacial Li transport, and exhibits a synergistic effect with the bulk material during the charging/discharging process. The FeO layer, which contains abundant oxygen vacancies, acts as an electrostatic shielding layer and effectively inhibits the outward migration of O (α < 2), thus improving the structural stability. Hence, the interface-protected NCM@LFO3 cathode showed excellent cycling stability (capacity retention of 82.4% after 600 cycles at 1 C) and even at a high cut-off voltage of 4.5 V (capacity retention of 88.9 % after 200 cycles at 1 C).

Electrostatic shielding layer LiFeO2&Fe2O3 LiNi0.8Co0.1Mn0.1O2 Lithium-ion batteries Synergistic effect

English

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ENGINEERING

2-s2.0-85152726357

Scopus

1.Guangxi Key Laboratory of Low Carbon Energy Materials,Guangxi New Energy Ship Battery Engineering Technology Research Center,Guangxi Scientific and Technological Achievements Transformation Pilot Research Base of Electrochemical Energy Materials and Devices,School of Chemistry and Pharmaceutical Sciences,Guangxi Normal University,Guilin,541004,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.SUSTech Energy Institute for Carbon Neutrality,Southern University of Science and Technology,Shenzhen,518055,China
4.School of Science,New Energy Technology Engineering Laboratory of Jiangsu Province,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu,210023,China
5.Institute of Chemical and Engineering Sciences,Singapore,1 Pesek Road, Jurong Island,627833,Singapore

Chu，Youqi,Mu，Yongbiao,Zou，Lingfeng,et al. Synergistic structure of LiFeO2 and Fe2O3 layers with electrostatic shielding effect to suppress surface lattice oxygen release of Ni-rich cathode[J]. Chemical Engineering Journal,2023,465.

Chu，Youqi.,Mu，Yongbiao.,Zou，Lingfeng.,Cheng，Jie.,Xi，Shibo.,...&Zeng，Lin.(2023).Synergistic structure of LiFeO2 and Fe2O3 layers with electrostatic shielding effect to suppress surface lattice oxygen release of Ni-rich cathode.Chemical Engineering Journal,465.

Chu，Youqi,et al."Synergistic structure of LiFeO2 and Fe2O3 layers with electrostatic shielding effect to suppress surface lattice oxygen release of Ni-rich cathode".Chemical Engineering Journal 465(2023).