Kim Chanho, Nam Gyutae, Ahn Yoojin, Hu Xueyu, Liu Meilin
School of Materials Science & Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Nat Commun. 2024 Oct 12;15(1):8832. doi: 10.1038/s41467-024-52767-8.
Li-based all-solid-state batteries (ASSBs) are considered feasible candidates for the development of the next generation of high-energy rechargeable batteries. However, ASSBs are detrimentally affected by a limited rate capability and inadequate performance at high currents. To circumvent these issues, here we propose the use of NbTiWO (NTWO) as negative electrode active material. NTWO is capable of overcoming the limitation of lithium metal as the negative electrode, offering fast-charging capabilities and cycle stability. Physicochemical and electrochemical characterizations of NTWO in combination with the LiPSCl (LPSCl) solid-state electrolyte demonstrate that the formation of LiWS at the electrode|electrolyte interphase is the main responsible for the improved battery performance. Indeed, when an NTWO-based negative electrode and LPSCl are coupled with a LiNbO-coated LiNiMnCoO-based positive electrode, the lab-scale cell is capable of maintaining 80% of discharge capacity retention after 5000 cycles at 45 mA cm at 60 °C and 60 MPa.
基于锂的全固态电池（ASSB）被认为是下一代高能可充电电池发展的可行候选者。然而，ASSB受到有限的倍率性能和高电流下性能不足的不利影响。为了规避这些问题，在此我们提出使用铌钛钨（NTWO）作为负极活性材料。NTWO能够克服锂金属作为负极的局限性，提供快速充电能力和循环稳定性。结合LiPSCl（LPSCl）固态电解质对NTWO进行的物理化学和电化学表征表明，在电极|电解质界面形成LiWS是电池性能改善的主要原因。实际上，当基于NTWO的负极和LPSCl与涂有LiNbO的LiNiMnCoO基正极耦合时，实验室规模的电池在60℃和60MPa下以45 mA cm的电流密度进行5000次循环后，能够保持80%的放电容量保持率。
