Journal
ADVANCED ENERGY MATERIALS
Volume 10, Issue 25, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202000495
Keywords
boron doping; microcrack suppression; microstructure; Ni-rich layered cathodes
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Funding
- National Research Foundation of Korea (NRF) - Korea government Ministry of Education and Science Technology (MEST) [NRF-2018R1A2B3008794]
- Human Resources Development programme of Korea Institute of Energy Technology Evaluation and Planning (KETEP) - Ministry of Trade, Industry and Energy of the Korean government [20184010201720]
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A new class of layered cathodes, Li[NixCoyB1-x-y]O-2 (NCB), is synthesized. The proposed NCB cathodes have a unique microstructure in which elongated primary particles are tightly packed into spherical secondary particles. The cathodes also exhibit a strong crystallographic texture in which the a-b layer planes are aligned along the radial direction, facilitating Li migration. The microstructure, which effectively suppresses the formation of microcracks, improves the cycling stability of the NCB cathodes. The NCB cathode with 1.5 mol% B delivers a discharge capacity of 234 mAh g(-1) at 0.1 C and retains 91.2% of its initial capacity after 100 cycles (compared to values of 229 mAh g(-1) at 0.1 C and 78.8% for pristine Li[Ni0.9Co0.1]O-2). This study shows the importance of controlling the microstructure to obtain the required cycling stability, especially for Ni-rich layered cathodes, where the main cause of capacity fading is related to mechanical strain in their charged state.
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