Affiliation:
1. School of Energy and Mechanical Engineering, Dezhou University, Dezhou 253023, China
Abstract
Stabilizing LiCoO2 (LCO) at 4.5 V rather than the common 4.2 V is important for the high specific capacity. In this study, we developed a simple and efficient way to improve the stability of LiCoO2 at high voltages. After a simple sol–gel method, we introduced trifluoroacetic acid (TA) to the surface of LCO via an afterwards calcination. Meanwhile, the TA reacted with residual lithium on the surface of LCO, further leading to the formation of uniform LiF nanoshells. The LiF nanoshells could effectively restrict the interfacial side reaction, hinder the transition metal dissolution and thus achieve a stable cathode–electrolyte interface at high working-voltages. As a result, the LCO@LiF demonstrated a much superior cycling stability with a capacity retention ratio of 83.54% after 100 cycles compared with the bare ones (43.3% for capacity retention), as well as high rate performances. Notably, LiF coating layers endow LCO with excellent high-temperature performances and outstanding full-cell performances. This work provides a simple and effective way to prepare stable LCO materials working at a high voltage.
Funder
Science and Technology Development Fund of Shandong Province
Science and Technology Development Fund of Dezhou City
Discipline Platform Project of Dezhou University
Doctoral Funds of Dezhou University
Reference70 articles.
1. From laboratory innovations to materials manufacturing for lithium-based batteries;Xiao;Nat. Energy,2023
2. Post-lithium-ion battery cell production and its compatibility with lithium-ion cell production infrastructure;Duffner;Nat. Energy,2021
3. Nanofluids as Media for High Capacity Anodes of Lithium-Ion Battery—A Review;Christensen;J. Nanofluids,2019
4. Hong, H., Salem, D.R., Christensen, G.L., and Yang, R. (2017). High Capacity Electrodes. (US9666861B2).
5. An Overview on the Advances of LiCoO2 Cathodes for Lithium-Ion Batteries;Lyu;Adv. Energy Mater.,2021