Pomegranate-like C@TiO2 mesoporous honeycomb spheres for high performance lithium ion batteries

• Published in: Nanotechnology Vol. 31; no. 43; p. 435410
• Main Authors: Chen, Q, Yuan, Y F, Yin, S M, Zhu, M, Cai, G S
• Format: Journal Article
• Language: English
• Published: IOP Publishing 23.10.2020
• Subjects: anode material; carbon; lithium ion batteries; TiO
• ISSN: 0957-4484; 1361-6528
• DOI: 10.1088/1361-6528/aba302

Pomegranate-like C@TiO2 mesoporous honeycomb spheres have been synthesized through two simple steps: formation of TiO2 mesoporous honeycomb spheres and the coating of polypyrrole followed by carbonization. TiO2 mesoporous honeycomb spheres are of large specific surface area of 153 m2 g−1 and contain abundant mesopores, which leads to high electrochemical activity and good kinetic performance of TiO2. A layer of amorphous carbon shell with the thickness of 30-40 nm tightly encapsulates a TiO2 mesoporous honeycomb sphere, forming a novel pomegranate-like small sphere, which significantly improves electronic conductivity and structural stability of TiO2. Benefiting from the unique pomegranate-like structure, C@TiO2 mesoporous honeycomb spheres exhibit high specific capacity, stable long-term cycling performance and good rate capability as an anode material for lithium ion batteries (LIBs). After 500 cycles at 1 C, the discharge capacity still reaches 184 mAh g−1. The electrochemical performance is superior to pure TiO2 mesoporous honeycomb spheres and most of the reported high-performance TiO2-based composites. This work provides a new high-performance TiO2-carbon-based composite material for LIBs as well as a new valuable research strategy.