Journal
NANO ENERGY
Volume 78, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105239
Keywords
Plasma treatment; Ni-rich cathode; Precursor; Structure; Li-ion batteries
Categories
Funding
- National Natural Science Foundation of China [51974256]
- Outstanding Young Scholars of Shaanxi [2019JC-12]
- Natural Science Basic Research Plan in Shaanxi Province of China [2019JLZ-01, 2019JLM-29]
- Key R&D Program of Shanxi [2019ZDLGY04-05]
- Fundamental Research Funds for the Central Universities [19GH020302, 3102019JC005]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX202026]
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Surface chemistry and micro/nano-structure of precursors greatly determine the characteristics and performances of precursor-derived Ni-rich cathodes. Some progress has been achieved in pre-treating precursors via classical wet-chemical methods, nevertheless, it is still inevitable that the surface chemical components or structures of precursors will be changed. Thus, exploring the non-destructive surface reinforcement strategy is of vital importance. Taking the typical Ni-rich cathodes (LiNi0.8Co0.15Al0.05O2, NCA) as an example, herein, a nondestructive surface reinforcement strategy to tailor surface characteristics of the precursor through plasma treatment technique has been proposed. Impressively, spectroscopic analysis and atomic-level imaging reveal that the plasma treatment of precursor is beneficial for both promoting the conversion of Ni2+ to Ni3+ and the formation of a porous surface without crystal defects. As a result, the annealed high-crystallinity NCA cathode, without NiO-type rock salt phase on the surface, displays enhanced cycling stability (81.2% capacity retention at 1C over 200 cycles) and increased rate performances (161.1 mA h g(-1) at 5C). The feasibility of extending this strategy to other electrode materials (such as LiNixCoyMn1-x-yO2, LiNiO2, etc.) by sintering precursors further promises a bright future. This work provides guidance to rational modify the Ni-based cathode materials and hold great potential of reviving the next generation high-energy-density Li-ion batteries.
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