Unlocking Rapid Charging and Extended Lifetimes for Li-Ion Batteries Using Freestanding Quantum Conversion-Type Aerofilm Anode
- Kim, Sun-Sik; Jung, Sung Mi; Senthil, Chenrayan; Jung, Hyun Young
- Issue Date
- AMER CHEMICAL SOC
- conversion-type anode; binder-free electrode; fast charging; lithium-ion battery; long-term cycle
- ACS NANO, v.15, no.11, pp.18437 - 18447
- Journal Title
- ACS NANO
- Start Page
- End Page
- Batteries capable of quick charging as fast as fossil fuel vehicles are becoming a vital issue in the electric vehicle market. However, conversion-type materials promising as a next-generation anode have many problems to satisfy fast charging and long-term cycles due to their low conductivity and large irreversibility despite a high theoretical capacity. Here, we report effective strategies for a SnO2-based anode to enable rapid-charging, long-cycle, and high reversible capacity. The quantum size of SnO2 nanoparticles uniformly embedded within a 3D conductive carbon matrix as a prerequisite for high reversible capacity increases the interdiffusion layer and facilitates a highly reversible conversion reaction between Li2O/Sn and SnO2. In particular, the Sn-C chemical bond achieves ion-site control and direct electron transfer, enabling boost charging. Further, the robust and porous structure of the binder-free three-dimensional electrode buffers the massive volume expansion during Li insertion/desertion and allows for multidimensional rapid-ion diffusion. As a result, our quantum SnO2 anode delivers a high reversible capacity of about 753 mAh g(-1) with a 468% capacity increase after 4000 cycles at 10 C. It also presents a gradually increasing capacity up to 548 mAh g(-1) even at 20 C and superior cyclability over 20 000 cycles in capacity stabilization. This study will contribute to designing aerofilm-based conversion-type electrodes for fast charging devices.
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- 융합기술공과대학 > Department of Energy Engineering > Journal Articles
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