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NiCo2S4 Bi-metal Sulfide Coating on LiNi0.6Co0.2Mn0.2O2 Cathode for High-Performance All-Solid-State Lithium Batteries

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Abstract
NiCo2S4 nanoparticles (NPs) were dry coated on LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode using a resonant acoustic coating technique to produce all-solid-state lithium batteries. The NiCo2S4 coating improved the electrochemical properties of the NCM622 cathode. In addition, NiCo2S4 eliminated the space-charge layer and the cathode showed an excellent affinity with the interface with a sulfide-based solid electrolyte as an inert material. X-ray diffraction patterns of NCM622 coated with NiCo2S4 showed the same peak separations and lattice parameters as those of bare NCM622. Field-emission scanning electron microscopy and electron dispersive spectroscopy mapping analyses showed that 0.3 wt% NiCo2S4-coated NCM622 had an evenly modified surface with NiCo2S4 NPs. X-ray photoelectron spectroscopy (XPS) revealed that the surface of 0.3 wt% NiCo2S4-coated NCM622 had two different S 2p peaks, a Co-S peak, and Ni and Co peaks, compared to those of bare NCM622. Electrochemical studies with electrochemical impedance spectroscopy and galvanostatic charge-discharge cycle performances showed that NiCo2S4-coated NCM622 retained a higher specific capacity over multiple cycles than bare NCM622. Especially, 0.3 wt% NiCo2S4-coated NCM622 exhibited a capacity retention of 60.6% at a current density of 15 mA/g for 20 cycles, compared to only 37.3% for bare NCM622. Finally, interfacial XPS and transmission electron microscopy-electron energy loss spectroscopy analyses confirmed the stable state of 0.3 wt% NiCo2S4-coated NCM622 with minimal side reactions.
Author(s)
강성김영진라제시 라자고팔류광선
Issued Date
2021
Type
Article
Keyword
NiCo2S4Bi-metal SulfideLiNi0.6Co0.2Mn0.2O2All-Solid-State Lithium Battery
DOI
10.1021/acsomega.0c05942
URI
https://oak.ulsan.ac.kr/handle/2021.oak/9628
https://ulsan-primo.hosted.exlibrisgroup.com/primo-explore/fulldisplay?docid=TN_cdi_doaj_primary_oai_doaj_org_article_2ea5c79b61d84021a3e39f121694bacd&context=PC&vid=ULSAN&lang=ko_KR&search_scope=default_scope&adaptor=primo_central_multiple_fe&tab=default_tab&query=any,contains,NiCo2S4%20Bi-metal%20Sulfide%20Coating%20on%20LiNi0.6Co0.2Mn0.2O2%20Cathode%20for%20High-Performance%20All-Solid-State%20Lithium%20Batteries&offset=0&pcAvailability=true
Publisher
ACS OMEGA
Location
미국
Language
영어
ISSN
2470-1343
Citation Volume
6
Citation Number
10
Citation Start Page
6824
Citation End Page
6835
Appears in Collections:
Natural Science > Chemistry
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