Fast Li-ion Storage and Dynamics in TiO 2 Nanoparticle Clusters Probed by Smart Scanning Electrochemical Cell Microscopy
Fast Li-ion Storage and Dynamics in TiO 2 Nanoparticle Clusters Probed by Smart Scanning Electrochemical Cell Microscopy
复制标题
通过智能扫描电化学电池显微镜探测 TiO 2 纳米颗粒团簇中的快速锂离子存储和动力学
DOI：
10.1002/anie.202214493
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Tetteh E
中科院分区：
文献类型：
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作者：
Tetteh E
锐钛矿型TiO 2是一种具有快速充电能力的锂离子（Li+）电池材料。然而，Li+（脱）插层动力学在TiO 2仍然难以捉摸和报告的扩散率跨越许多数量级。在这里，我们开发了一种智能协议，用于扫描电化学电池显微镜（SECCM）和原位光学显微镜（OM），以实现单个TiO 2纳米颗粒簇的高通量充电/放电分析。直接探测活性纳米颗粒发现，粒径为50 nm的TiO 2在100 ℃的极快速充放电速率下可以储存超过30%的理论容量。 在TiO 2颗粒中快速存储Li+的这一发现增强了其快速充电电池的潜力。更一般地说，智能SECCM-OM应该在纳米结构材料的高通量电化学筛选中找到广泛的应用。
Anatase TiO2is a promising material for Li‐ion (Li+) batteries with fast charging capability. However, Li+(de)intercalation dynamics in TiO2remain 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 TiO2nanoparticle clusters. Directly probing active nanoparticles revealed that TiO2with 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 TiO2particles strengthens its potential for fast‐charging batteries. More generally, smart SECCM‐OM should find wide applications for high‐throughput electrochemical screening of nanostructured materials.