Journal
ELECTROCHIMICA ACTA
Volume 391, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.138917
Keywords
Sulfide-based all-solid-state lithium batteries; Ni-rich oxide cathode; Core-shell structure; Al-modifying layer; High mass loading
Categories
Funding
- National Key Research and Development Program of China [2018YFE0111600, 17YFZCGX00560]
- Special Funds for Innovation Driven Development of Guangxi Zhuang Autonomous Region [AA17204061]
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This study successfully improved the performance of sulfide-based all-solid-state lithium batteries by constructing a core-shell structure of Ni-rich Li(Ni0.9Mn0.05Co0.05)(0.8)Co0.2O2 and modifying it with an Al source, which effectively reduced surface nickel content and minimized volume change.
The interface side reaction and mechanical failure are the main factors affecting electrochemical performances of Ni-rich oxide cathode for sulfide-based all-solid-state lithium batteries (ASSLBs). It is believed that the interface side reaction is mainly caused by the high nickel content and residual lithium compounds on the surface, and the mechanical failure is mainly caused by severe volume change during cycling. In view of this, core-shelled Ni-rich Li(Ni0.9Mn0.05Co0.05)(0.8)Co0.2O2 is constructed and further modified with Al source. In this strategy, the core-shell structure design of Ni-rich oxide material can decrease the surface nickel content and reduce the volume change, and the surface modification process of core shelled Ni-rich oxide material with aluminum isopropoxide can generate Al-modifying layer (Al2O3 and LiAlO2 layer), which will not only remove the lithium compounds but also form the coating layer. Under high mass loading of 36.94 mg cm(-2), Al-modified Li(Ni0.9Mn0.05Co0.05)(0.8)Co0.2O2 (CS-NCM@Al) cathode displays the discharge capacity of 158.6 mAh g(-1) at 0.2 C with high initial coulombic efficiency of 88.3%. More significantly, it shows a significant capacity retention of 96.3% after 500 cycles at 1 C (7.39 mA cm(-2)). This work opens up a new avenue for meeting the future application of high energy density sulfide-based ASSLBs. (C) 2021 Elsevier Ltd. All rights reserved.
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