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Indexed by:期刊论文

Date of Publication:2019-06-01

Journal:IONICS

Included Journals:SCIE、EI

Volume:25

Issue:6

Page Number:2535-2542

ISSN No.:0947-7047

Key Words:Anode material; Li4Ti5O12; Cotton-driven carbon fiber; Lithium-ion batteries

Abstract:In this paper, we reported a simple, inexpensive, and green biomimetic technique for developing high-performance Li4Ti5O12 for lithium-ion batteries. Carbon-coated Li4Ti5O12 particles were synthesized by using cotton-driven carbon fiber as both a structural template and a biocarbon source. The conductive and uniform cotton-driven carbon fiber coated on the surface of the Li4Ti5O12 particles significantly improved the electrochemical performance of the composite, which exhibited a higher reversible capacity and a better rate capability than those of pure Li4Ti5O12. The average grain size of Li4Ti5O12/cotton fiber (CF) was approximately 200-400nm, which was considerably smaller, more uniform, and regular than that of pure Li4Ti5O12. The initial charge capacity of the Li4Ti5O12/CF electrodes was 183.3mAhg(-1) at 100mAg(-1) (0.57C). After 100cycles, the electrodes retained a capacity of 152.9mAhg(-1), which was 30.6% higher than that of Li4Ti5O12 (117.1mAhg(-1)). The superior electrochemical performance can be attributed to the improved ionic and electronic conductivities in the electrode produced by the uniform cotton-driven carbon fiber coating layer.