Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 13, Issue 43, Pages 50965-50974Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c14568
Keywords
LiNiO2; cobalt-free; electrolysis; cathode; lithium-ion battery
Funding
- National Key Research and Development Program of China [2019YFA0705101]
- National Natural Science Foundation of China [22179144]
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A fast, simple, and inexpensive electrolysis process was used to prepare a Ni(OH)2 precursor mixed with LiOH/LiNO3 salts to obtain a LiNiO2 cathode material, which exhibited excellent layered structure and good cycling performance.
Cobalt-free LiNiO2 cathode materials offer a higher energy density at a lower cost than high Co-containing cathode materials. However, Ni(OH)(2) precursors for LiNiO2 cathodes are traditionally prepared by the coprecipitation method, which is expensive, complex, and time-consuming. Herein, we report a fast, facile, and inexpensive electrolysis process to prepare a Ni(OH)(2) precursor, which was mixed with LiOH/LiNO3 salts to obtain a LiNiO2 cathode material. A combination of advanced characterization techniques revealed that the LiNiO2 cathode material prepared in this way exhibited an excellent layered structure with negligible Li/Ni site mixing and surface structural distortion. Electrochemical cycling of the LiNiO2 cathode material showed an initial discharge capacity of 235.2 mA h/g and a capacity retention of 80.2% after 100 cycles (at 1 C) between 2.75 and 4.3 V. The degradation of the cycling performance of the LiNiO2 cathode material was mainly attributed to the formation of a surface solid-electrolyte interface and a similar to 5 nm rock salt-like structure, while the bulk structure of the cathode after cycling was generally stable.
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