Practical Development of Si Anode with Gas Phase Synthesis for High-energy Lithium-ion Batteries
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Si anodes in lithium-ion batteries has shown great potential to boost energy density due to its high specific capacity, suitable working voltage, and cost-effectiveness. However, challenges like significant volume expansion and limited electrical conductivity have hindered widespread adoption. Nanoengineering strategies, especially gas-phase synthesis using SiH4, have emerged to tackle these issues. This method enables downsizing, impurity control, and diverse phase engineering, leading to desirable attributes such as high cycle efficiency, stability, and minimal swelling. In this presentation, I will overview the progress in gas-phase synthesis of Si anodes, including scalable Si nanolayer-embedded graphite and subnano-sized Si anodes achieved through crystal growth inhibition. Additionally, potential future directions and elemental technologies for further enhancing Si anode performance will be explored.