A cooperative biphasic MoOx–MoPx promoter enables a fast-charging lithium-ion batteryopen access
- Authors
- Lee, Sang-Min; Kim, Junyong; Moon, Janghyuk; Jung, Kyu-Nam; Kim, Jong Hwa; Park, Gum-Jae; Choi, Jeong-Hee; Rhee, Dong Young; Kim, Jeom-Soo; Lee, Jong-Won; Park, Min-Sik
- Issue Date
- Jan-2021
- Publisher
- Nature Research
- Citation
- Nature Communications, v.12, no.1
- Journal Title
- Nature Communications
- Volume
- 12
- Number
- 1
- URI
- https://scholarworks.bwise.kr/cau/handle/2019.sw.cau/62610
- DOI
- 10.1038/s41467-020-20297-8
- ISSN
- 2041-1723
- Abstract
- The realisation of fast-charging lithium-ion batteries with long cycle lifetimes is hindered by the uncontrollable plating of metallic Li on the graphite anode during high-rate charging. Here we report that surface engineering of graphite with a cooperative biphasic MoOx–MoPx promoter improves the charging rate and suppresses Li plating without compromising energy density. We design and synthesise MoOx–MoPx/graphite via controllable and scalable surface engineering, i.e., the deposition of a MoOx nanolayer on the graphite surface, followed by vapour-induced partial phase transformation of MoOx to MoPx. A variety of analytical studies combined with thermodynamic calculations demonstrate that MoOx effectively mitigates the formation of resistive films on the graphite surface, while MoPx hosts Li+ at relatively high potentials via a fast intercalation reaction and plays a dominant role in lowering the Li+ adsorption energy. The MoOx–MoPx/graphite anode exhibits a fast-charging capability (<10 min charging for 80% of the capacity) and stable cycling performance without any signs of Li plating over 300 cycles when coupled with a LiNi0.6Co0.2Mn0.2O2 cathode. Thus, the developed approach paves the way to the design of advanced anode materials for fast-charging Li-ion batteries. © 2021, The Author(s).
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