Abstract
Nowadays, Li-ion batteries are important on energy storage but most of appliances are still using traditional materials as the electrode. For instance, graphite is widely applied to 99% of Li-ion batteries despite the theoretical capacity just 372 mAh/g. Silicon has a large theoretical capacity and it make it an attractive anode material, but volume expansion during cycling and an unstable Solid electrolyte interphase(SEI) has consume lithium source led to irreversible capacity increase. Artificial nanostructure is effectively to overcome the issue of volume expansion, therefore, this work aim to realize controllable synthesis of hollow spherical shell base on Silicon from common and easily accessible silica nanoparticles and magnesiothermic reduction and to study their morphology (TEM,SEM) components (EDX,XPS), structure (XRD,XAS), electrochemical performance as an anode of lithium-ion batteries (LIBs) and ex-situ X-ray studying. By using Double wall silicon spherical shell as anode material for lithium-ion batteries, electrochemical performance shows much better than commercial silicon powder, then we used ex-situ techniques based on XRD and XRD, the experiment result shows Lithium ion breakdown Si-Si bonding and Si have two phase reaction between Si and LixSi(x<=3.75) during cycling.