Key Takeaways & Executive Findings
- •• Silicon anodes offer ultrahigh theoretical capacity but suffer from volume expansion and unstable SEI, limiting commercial use. • 3D carbon coatings effectively buffer mechanical strain and isolate electrolyte, improving structural stability and interface properties. • Various carbon materials (amorphous carbon, graphite) and novel coating methods are reviewed for enhancing Si anode performance. • Modification of carbon shells and exploration of substitutes are current research directions to overcome remaining drawbacks.
Abstract
In the development of rechargeable lithium ion batteries (LIBs), silicon anodes have attracted much attention because of their extremely high theoretical capacity, relatively low Li-insertion voltage and the availability of silicon resources. However, their large volume expansion and fragile solid electrolyte interface (SEI) film hinder their commercial application. To solve these problems, Si has been combined with various carbon materials to increase their structural stability and improve their interface properties. The use of different carbon materials, such as amorphous carbon and graphite, as three-dimensional (3D) protective anode coatings that help buffer mechanical strain and isolate the electrolyte is detailed, and novel methods for applying the coatings are outlined. However, carbon materials used as a protective layer still have some disadvantages, necessitating their modification. Recent developments have focused on modifying the protective carbon shells, and substitutes for the carbon have been suggested.
1. Introduction
The recent surge in energy demand and environmental challenges has spurred rapid advancements in rechargeable lithium-ion batteries (LIBs)[1,2]. Graphite is the dominant commercial anode material for LIBs due to its excellent conductivity and electrochemical reversibility[3]. However, the low specific capacity of graphite is unfavorable for achieving high-energy-density LIBs[4].
Silicon (Si) can react with Li+ under the expected lithium intercalation voltage (～0.25 V vs. Li/Li+) and convert to Li3.75Si alloy with an ultrahigh reversible capacity (about 3 579 mAh g–1), which makes high-energy-density LIBs possible[5,6]. Nevertheless, Si-based anode has poor electronic conductivity[7]. Meanwhile, the cracking and peeling of anode materials as well as fragile solid electrolyte interface (SEI) caused by tremendous volume expansion during the alloy reaction substantially deteriorate the Li-storage performance of Si anode (Fig. 1)[8]. It is well known that carbon materials have outstanding electronic conductivity and structural stability[9]. In this regard, the composites of Si and various carbon materials with one-dimensional (1D), two-dimensional (2D) or three-dimensional (3D) structures have reaped intensive research to enhance the electrochemical performance of Si anode for LIBs.
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XU Ze-yu, SHAO Hai-bo, WANG Jian-ming (2025). A review of the carbon coating of the silicon anode in high-performance lithium-ion batteries. SinoTechIntel Verified Research. https://doi.org/10.1016/S1872-5805(NCM2024-39-05-08)
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Frequently Asked Questions
What are the main challenges of silicon anodes in lithium-ion batteries?
Silicon anodes suffer from large volume expansion during lithiation, which causes cracking and peeling of the electrode material, and the formation of a fragile solid electrolyte interface (SEI) film, leading to poor cycling stability and low Coulombic efficiency.
How does carbon coating improve silicon anode performance?
Carbon coating, especially three-dimensional (3D) carbon shells, provides structural buffering to accommodate volume changes, enhances electronic conductivity, and isolates the silicon surface from direct electrolyte contact, thereby stabilizing the SEI and improving overall electrochemical performance.
What carbon materials are used for coating silicon anodes?
Various carbon materials are used, including amorphous carbon, graphite, carbon nanotubes (CNTs), carbon nanofibers (CNFs), and graphene. These can be applied as 1D, 2D, or 3D structures to form protective coatings.
What are the limitations of carbon coatings on silicon anodes?
Despite benefits, carbon coatings may not fully prevent side reactions if the coating is incomplete, and they can add weight and complexity. Additionally, the carbon layer itself may undergo degradation over long-term cycling, necessitating further modification or alternative materials.
What are recent research directions for improving carbon-coated silicon anodes?
Recent developments focus on modifying the carbon shell, such as doping with heteroatoms, creating porous structures, or using alternative protective materials like MXenes, to enhance mechanical robustness, ionic transport, and SEI stability.
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