Structural and electrochemical evaluation of a TiO2–graphene oxide based sandwich structure for lithium-ion battery anodes†
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Abstract
In this paper, we report a rational sandwich composite structure consisting of polyaniline (PANI), amorphous TiO2 (a-TiO2), and a GO network as an anode material for lithium-ion batteries (LIBs). After the synthesis of the a-TiO2–GO composite assisted by laser ablation in liquid, PANI nanorods are vertically grown on the both sides of a-TiO2–GO nanosheets to obtain a stable sandwich structure. The morphology and components of the composites are confirmed by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. As a typical anode material in LIBs, the fabricated sandwich composites display a high rate capability and long cycle life. A first discharge capacity of 1335 mA h g−1 is shown at 50 mA g−1 and a reversible capacity of 435 mA h g−1 is achieved after 250 cycles at 100 mA g−1. Even at a high cycling rate of 10 A g−1, the sandwich products exhibit a stable capacity of 141 mA h g−1. This effort highlights the design of a sandwich structure using amorphous TiO2, GO, and PANI nanorods and its potential benefits for LIB application.
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