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Lithium Titanate Matrix-Supported Nano-Crystalline Silicon Film as an Anode for Lithium-Ion Batteries.
ACS Applied Materials & Interfaces 2018 December 11
A facile preparation method of a Si-based anode with excellent cycling property is urgently required in the process of preparing lithium-ion batteries (LIBs). Here, lithium titanate (LTO) matrix-supported nano-crystalline Si film is prepared by radio frequency (RF) magnetron co-sputtering utilizing LTO and silicon (Si) targets as the sputtering source. LTO supported nano-crystalline Si film electrodes revealed a repeatable specific capacity of 1200 mA h g-1 at 150 mA g-1 with a maintenance of more than 75% even after 800 cycles. The remarkable electrochemical properties of the LTO-Si composite films could be attributed to the LTO matrix preventing the electrolyte from directly making contact with the nanocrystalline Si materials, alleviating the stress of the periodic volume change and further providing efficient and rapid pathways for lithium ion transport. The results suggest that Si-based LTO composite films are prospective anodes for LIBs, with high capacities and long cycling stabilities.
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