青岛科技大学  English 
李桂村
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教授 博士生导师  
硕士生导师  

教师拼音名称:liguicun

出生日期:1974-05-12

电子邮箱:

所在单位:材料学院综合办公室

职务:材料科学与工程学院院长

学历:博士研究生

办公地点:材料楼225房间

性别:男

联系方式:guicunli@qust.edu.cn Tel:13730918070

学位:工学博士

职称:教授

毕业院校:中国海洋大学

学科:

材料物理与化学

曾获荣誉:

2016-01-01 山东省有突出贡献的中青年专家

2012-11-07 山东省第三届优秀研究生指导教师

2011-04-01 青岛拔尖人才

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Comparison study of electrochemical properties of porous zinc oxide/N-doped carbon and pristine zinc oxide polyhedrons

关键字:Zinc oxide; Polyhedrons; N-doped carbon; Anode; Lithium ion battery

摘要:An in-situ calcination strategy has been developed for the synthesis of porous zinc oxide/N-doped carbon (ZnO/NC) polyhedrons, in which zeolitic imidazolate framework-8 (ZIF-8) serves as the precursor. The ZnO/NC polyhedrons with a hierarchical architecture possess a high specific surface area of 390.7 m(2) g(-1), high nitrogen content (19.99 at%,), and robust pore structures. The porous N-doped carbon frameworks can not only increase the electronic conductivity of ZnO, but also provide interior space for the fast diffusion of Li+ ions and accommodate the volume variations during the charge and discharge cycles. When evaluated for lithium storage capacity, the hierarchical ZnO/NC polyhedrons exhibit high reversible discharge capacity (834.3 mAh g(-1) at the initial low rate of 0.5C, 1C = 978 mA g(-1)), superior rate performance (399.2 mAh g(-1) at 5C and 253.5 mAh g(-1) at 10C), and excellent cycling stability (677.9 mAh g(-1) at 1C after 400 cycles). The reasons are explored in terms of the well-confined primary nanocrystals (5 nm), and the finely constructed interconnected pores of the N-doped carbon networks, which facilitate the fast and effective transfer of Li+ ions and electrons, and accommodate the large volume expansions. (C) 2015 Elsevier B.V. All rights reserved.

卷号:285

期号:

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