The Influence of Silicon Anode Morphology on Energy Storage Performance in Lithium-Ion Batteries

Abstract

The rapid electrification of transportation, together with the continued growth of portable electronics and renewable-energy storage, has increased demand for lithium-ion batteries with higher energy density and longer cycle life. Silicon is widely regarded as a promising alternative to graphite because of its exceptionally high theoretical capacity and low lithiation potential. However, practical application remains limited by severe volume expansion, unstable solid electrolyte interphase (SEI) formation, and poor electrical conductivity. This review examines how silicon-anode morphology affects lithium-storage performance by comparing four representative structures: silicon nanoparticles, nanotube and tube-like architectures, bulk or micron-sized silicon, and thin films. The comparison shows that each morphology offers a different balance among lithium-ion transport, mechanical stability, electrode density, and manufacturability. Nanostructured silicon generally improves stress tolerance and reaction kinetics, whereas larger or denser structures offer advantages in packing density, cost, and industrial compatibility. No single morphology is universally superior. Future progress will therefore depend on combining multiscale structural design with stable interfaces, suitable binders and electrolytes, and scalable manufacturing methods to translate silicon's high theoretical capacity into durable full-cell performance.