Synthesis and characterization of SiO2/Ti3C2 anode materials for lithium-ion batteries via different methods

Abstract

Silicon dioxide (SiO 2 ) has great potential application as anode materials for lithium-ion battery owing to the rich resource, economic cost, and easy preparation. SiO 2 /Ti 3 C 2 (ST-1, ST-2, and ST-3, respectively) nano-/microcomposites were synthesized via three different methods (sol-gel, centrifugal-drying, and freeze-drying method), and the SEM results indicate that abundant SiO 2 particles are distributed on the modified surface of multilayer Ti 3 C 2 nanosheets, forming stable multiphase structures. Electrochemical results demonstrate that the SiO 2 /Ti 3 C 2 composites can deliver good electrochemical performance and almost have no capacities decay after hundreds of cycles. In particular, the structure properties of ST-3 composite synthesized by freezedrying were well preserved, delivering a reversible discharge capacity of 242.4 mAh g −1 at 100 mA g −1 , even after high-rate test (5000 mA g −1 ), still exerting 258.6 mAh g −1 reversible discharge capacity at 100 mA g −1 , indicating good structural stability and electrochemical reversibility of ST-3 composite for lithium-ion batteries.Keywords Ti 3 C 2 . SiO 2 . Anode material . Lithium-ion battery * Jun-chao Zheng

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