Hits:

Indexed by:期刊论文

Date of Publication:2016-01-10

Journal:ELECTROCHIMICA ACTA

Included Journals:SCIE、EI

Volume:188

Page Number:793-800

ISSN No.:0013-4686

Key Words:MnO@C composite; Porous structure; Precipitation; Glucose; Lithium-ion batteries

Abstract:MnC2O4 precursor was prepared by a precipitation method, and then porous MnO@C composites were obtained by mixing MnC2O4 precursor with different amounts of glucose and sintering at different temperatures. The influences of carbon content and crystallinity on the electrochemical performance of MnO@C were investigated. Galvanostatic charge-discharge test results showed that the MnO@C sample "1.2,700" has the largest specific capacity among all samples, which can reach high specific discharge capacity of 1691 mAhg(-1) at the current density of 100 mAg(-1) after 200 cycles. Even at the high current density of 1600 mA g(-1), a remarkable discharge capacity of 630 mAhg(-1) can still be delivered, demonstrating a good rate capability. The excellent electrochemical performance can be ascribed to porous structure, good crystallinity and proper amount of carbon coating. This facile method can be applied to the large-scale synthesis of high performance transition metal oxide@carbon composite electrode materials. (C) 2015 Elsevier Ltd. All rights reserved.