Carbon Dot-Modified TiO2@SiO2 Aerogel as an Anode for Lithium-Ion Batteries

Springer Science and Business Media LLC - Tập 6 Số 1 - 2023
Zanyu Chen1, Jiugang Hu1, Kejian Ding1, Jun Tan1, Hongshuai Hou1, Xiaobo Ji1
1College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Tóm tắt

AbstractTitanium oxides have been considered promising anode materials for lithium-ion batteries (LIBs). However, the poor conductivity and low specific capacity of bulk titanium oxides limit their application. In this study, a carbon dot-modified TiO2@SiO2 aerogel was successfully fabricated through a facile ambient pressure drying strategy and used as an anode material of LIBs. Benefiting from the crosslinking of carbon dots and the surface modification of SiO2, the as-prepared hierarchical aerogel exhibited a high initial discharge capacity of 974 mAh g−1 and maintained a capacity of 299 mAh g−1 after 100 cycles at 0.1 A g−1. It also retained a discharge capacity of 111 mAh g−1 with a CE of 99.9% at 3 A g−1. The carbon dot-modified cross-linking skeleton contributes to the structural integrity of the TiO2@SiO2 aerogel during repeated insertion/extraction of lithium ions, guaranteeing outstanding cycling and high-rate performance. This ambient pressure drying strategy provides a facile and feasible way to produce high-performance aerogel anode materials for lithium-ion storage.

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