Chemical characterisation of Silicon anode swelling during Lithium ion battery cycling

电动汽车的续航里程最终由电池的能量密度决定。从负极材料发展的角度来看，能量密度是存储锂的能力的函数。硅的容量(3600mAh/g)比传统的石墨(360mAh/g)大得多，然而，由于严重的体积膨胀(高达300%)以及在锂离子插入和提取过程中发生的相应化学变化导致容量突然下降，硅基阳极目前还不能被工业接受。硅阳极化学状态的变化，如氧化、碳化物形成、固体电解质界面的变化等，对于了解这些先进负极材料对电池性能的长期影响非常重要。因此，Talga的目标是利用A4I计划与国家物理实验室(NPL)的科学家及其最先进的设施合作，以更深入地了解硅负极电池中发生的化学变化，并利用这些信息获得更广泛的接受和其产品的商业化。

The range of an electric vehicle is ultimately determined by the energy density of the battery. From the perspective of anode material development, energy density is a function of the ability to store lithium. Silicon has a much larger capacity (3600 mAh/g) compared to conventional graphite (360 mAh/g), however, Si-based anodes currently fall short in industrial acceptance due to severe volume expansion (as high as 300%) and corresponding chemical changes occurring during Li-ion insertion and extraction causing sudden capacity drop.Changes in the chemical state of Silicon anodes such as changes in oxidation, carbide formation, changes in solid electrolyte interface, etc, are important in understanding the long-term effects of these advanced anode materials on battery cell performance. Therefore, Talga aims to use the A4I program to work with National Physical Laboratory (NPL) scientists and their state-of-the-art facilities to gain a deeper understanding of the chemical changes that occur in silicon anode-based batteries and use the information in gaining wider acceptance and commercialisation of it's product.