Department of Chemistry, University of Warwick, Coventry, CV47AL, UK.
Analytical Chemistry-, Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstr. 150, 44780, Bochum, Germany.
Angew Chem Int Ed Engl. 2023 Feb 20;62(9):e202214493. doi: 10.1002/anie.202214493. Epub 2023 Jan 24.
Anatase TiO is a promising material for Li-ion (Li ) batteries with fast charging capability. However, Li (de)intercalation dynamics in TiO remain elusive and reported diffusivities span many orders of magnitude. Here, we develop a smart protocol for scanning electrochemical cell microscopy (SECCM) with in situ optical microscopy (OM) to enable the high-throughput charge/discharge analysis of single TiO nanoparticle clusters. Directly probing active nanoparticles revealed that TiO with a size of ≈50 nm can store over 30 % of the theoretical capacity at an extremely fast charge/discharge rate of ≈100 C. This finding of fast Li storage in TiO particles strengthens its potential for fast-charging batteries. More generally, smart SECCM-OM should find wide applications for high-throughput electrochemical screening of nanostructured materials.
锐钛矿 TiO 是一种很有前途的锂离子（Li ）电池材料，具有快速充电能力。然而，TiO 中的 Li（脱）插动力学仍然难以捉摸，并且报道的扩散率跨越了多个数量级。在这里，我们开发了一种带有原位光学显微镜（OM）的扫描电化学池显微镜（SECCM）的智能方案，以实现对单个 TiO 纳米颗粒簇的高通量充放电分析。直接探测活性纳米颗粒表明，粒径约为 ≈50nm 的 TiO 可以以 ≈100C 的极快充放电速率存储超过 30%的理论容量。这一发现表明 TiO 颗粒中快速的 Li 存储增强了其用于快速充电电池的潜力。更一般地说，智能 SECCM-OM 应该会为纳米结构材料的高通量电化学筛选找到广泛的应用。
