The Potential Regulation of Working Anode for Long-Term Zero-Volt Storage at 37 °C in Li-Ion Batteries.

Autor: Wang H; National Engineering Research Center of Neuromodulation, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China., Liu Y; National Engineering Research Center of Neuromodulation, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China., Jiang M; National Engineering Research Center of Neuromodulation, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China., Yao YX; Center for Green Chemical Engineering Electrification, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China., Hu C; National Engineering Research Center of Neuromodulation, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China., Yan C; Center for Green Chemical Engineering Electrification, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China., Zhang Q; Center for Green Chemical Engineering Electrification, Department of Chemical Engineering, Tsinghua University, Beijing, 100084, China., Li L; National Engineering Research Center of Neuromodulation, School of Aerospace Engineering, Tsinghua University, Beijing, 100084, China.; IDG/McGovern Institute for Brain Research at Tsinghua University, Beijing, 100084, China.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2024 Jun; Vol. 36 (25), pp. e2400656. Date of Electronic Publication: 2024 Apr 02.
DOI: 10.1002/adma.202400656
Abstrakt: The advanced lithium-ion batteries that can tolerate zero-volt storage (ZVS) are in high demand for implantable medical devices and spacecraft. However, ZVS can raise the anode potential, leading to Cu current collector dissolution and solid-electrolyte interphase (SEI) degradation, especially at 37 °C. In this contribution, by quantitatively regulating the dosage of Li 6 CoO 4 cathode additives, controllable potential of the working anode under abusive-discharge conditions is demonstrated. The addition of Li 6 CoO 4 keeps zero-crossing potential (ZCP) and the potential of ZVS below 2.0 V (vs Li/Li + ) for LiCoO 2 |mesocarbon microbead cells at 37 °C. The capacity retention ratio (CRR) increases from 69.1% and 35.9% to 98.6% and 90.8% after 10 and 20 days of ZVS, respectively. The Cu dissolution and SEI degradation are effectively suppressed, while the over-lithiated cathode exhibits high reversible capacity after ZVS. The limiting conditions of long-term ZVS are further explored and a corresponding guide map is designed. When quantitatively regulating ZCP and the potential in ZVS, Cu dissolution, SEI degradation, and irreversible conversion of the cathode constitute the limiting conditions. This contribution designs the most reasonable potential range for ZVS protection at 37 °C, and realizes the best CRR record through precise potential regulation for the first time.
(© 2024 Wiley‐VCH GmbH.)
Databáze: MEDLINE
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