Pomegranate-like C@TiO2 mesoporous honeycomb spheres for high performance lithium ion batteries. (6th August 2020)

• Record Type: Journal Article
• Authors: Chen, Q; Yuan, Y F; Yin, S M; Zhu, M; Cai, G S
• Is Part Of: Nanotechnology. Volume 31:Number 43(2020)
• Publication Date: 2020-08-06
• Subjects: TiO2 -- carbon -- lithium ion batteries -- anode material; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/aba302
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: 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 m 2 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.