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Title: | Effect of TiOx Surface Modification on the Electrochemical Performances of Ni-Rich (NMC-622) Cathode Material for Lithium-Ion Batteries | Authors: | MYLAVARAPU, Satish Kumar ULU, Fulya YARI, Saeed DE SLOOVERE, Dries D'HAEN, Jan SHAFIQUE, Ahmed VAN BAEL, Marlies SAFARI, Momo HARDY, An |
Issue Date: | 2021 | Publisher: | AMER CHEMICAL SOC | Source: | Acs Applied Energy Materials, 4 (10), p. 10493-10504 | Abstract: | Ni-rich layered lithium transition metal oxides (LiNi x Mn y Co z O 2) have gained significant attention as high-capacity positive electrode materials for lithium-ion batteries. However, their poor cyclability, capacity retention, and rate capability at higher working potentials limit their applications in commercial batteries. Here, we demonstrate a cost-effective chemical solution deposition route of a thin TiO x shell on LiNi 0.6 Mn 0.2 Co 0.2 O 2 (NMC-622) particles and the effect of surface modification on the electrochemical properties. The crystallinity and morphology of the NMC-622 particles are unaffected by the deposition step and verified by powder X-ray diffraction and electron microscopy. High-resolution transmission electron microscopy (HR-TEM) and selected area electron diffraction (SAED) analysis showed that the TiO x surface layer is amorphous and prone to enhance the electronic conductivity of the cathode material. The TiO x-coated material has an improved rate performance and experiences a lower charge-transfer resistance compared to the pristine material. The effect of the surface modification on the electrochemical performance of NMC-622 was investigated further by the assembly of NMC-622/Li 4 Ti 5 O 12 (LTO) full cells. The beneficial impact of the TiO x coating on the electrochemical performance of NMC-622 positive electrodes in lithium-ion battery applications was showcased by the higher initial Coulombic efficiency and lower aging rates during 150 cycles at 1C in NMC-622/LTO cells. | Keywords: | lithium-ion batteries;Ni-rich layered NMC;surface modification;amorphous TiO x coating;and capacity retention | Document URI: | http://hdl.handle.net/1942/35510 | ISSN: | 2574-0962 | DOI: | 10.1021/acsaem.1c01309 | ISI #: | 000711236300010 | Rights: | 2021 American Chemical Society | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2022 |
Appears in Collections: | Research publications |
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File | Description | Size | Format | |
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Effect of TiO2 surface modification on the electrochemical performances of Ni rich cathode material_author version.pdf | Peer-reviewed author version | 1.65 MB | Adobe PDF | View/Open |
acsaem.1c01309.pdf Restricted Access | Published version | 9.03 MB | Adobe PDF | View/Open Request a copy |
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