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Improving electrochemical performances of lithium-ion capacitors employing 3D structured Si anodes
Juyeon Baek,Seokho Suh,Hyunsu Kim,Hyeonghun Park,Santosh Kumar,Tomas Tamulevicius,Sigitas Tamulevicius,Hyeong-Jin Kim 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.126 No.-
Lithium-ion capacitors (LICs) are gaining attention from researchers as the demand for an energy storagedevice that addresses the drawbacks of lithium-ion batteries and supercapacitors is increasing. Silicon(Si) is a desirable anode material for LICs due to its high theoretical capacity and low working potential. However, Si experiences extreme volume changes of up to 300%, which cause a poor cycle life. To mitigatemechanical stress in Si anodes, we fabricated a three-dimensional structured Si electrode using a poreformingagent and evaluated its physical-electrochemical properties. The pore network of the structuredSi electrode effectively buffered the volume change, alleviating crack formation in the electrode andresulting in improved cycle stability. The LIC full cell using the structured Si had a high energy densityof 191.4 Wh kg1 at a power density of 723.7Wkg1. Our approach is compatible with conventional electrodefabrication systems and provides a cost-effective and practical method for pure Si anodes suitablefor use in LICs through a simple pore-structuring process.