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题名: Fast sol-gel synthesis of mesoporous Li2MnSiO4/C nanocomposite with improved electrochemical performance for lithium-ion batteries
作者: Wang, Fuqing1, 2;  Chen, Jian1;  Wang, Chong1;  Yi, Baolian1
关键词: Lithium manganese silicate ;  Nanocomposite ;  Hydrochloric acid ;  Propylene oxide ;  Sol-gel method ;  Lithium-ion battery
刊名: JOURNAL OF ELECTROANALYTICAL CHEMISTRY
发表日期: 2013
DOI: 10.1016/j.jelechem.2012.10.014
卷: 688, 页:123-129
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Electrochemistry
研究领域[WOS]: Chemistry ;  Electrochemistry
英文摘要: A fast sal-gel process that differs in important details from previously reported methods for preparing Li2MnSiO4/C nanocomposite was reported. In the process, hydrochloric acid was used to enhance the hydrolysis of tetraethyl orthosilicate (TEOS) to obtain silanols firstly. And then propylene oxide was added to promote the condensation of the silanols to form a jelly-like SiO2 gel precursor containing lithium and manganese sources in about 3 min at room temperature. The final product of Li2MnSiO4/C was obtained by calcining the gel precursor with sucrose. The structure, micro-morphology and electrochemical property of the as-prepared Li2MnSiO4/C nanocomposite were characterized by XRD, TEM, N-2 adsorption-desorption, cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS). The results indicate that the Li2MnSiO4/C nanocomposite with mesoporous structure is composed of 10-20 nm nanoparticles homogenously coated by the carbon. The electrochemical measurements reveal that the initial charge and discharge specific capacities of the prepared Li2MnSiO4/C nanocomposite are 275.2 mAh g(-1) and 164.2 mAh g(-1), respectively. After 60 cycles, the discharge capacity retention is 80%. The excellent electrochemical performance can be attributed to the nano-sized composites with a mesoporous structure and the in situ surface carbon coating. (C) 2012 Elsevier B.V. All rights reserved.
关键词[WOS]: CATHODE MATERIAL ;  ELECTRODE MATERIALS ;  STORAGE DEVICES ;  OXIDE AEROGELS ;  ANODE MATERIAL ;  LI ;  LIFEPO4 ;  HYDROLYSIS ;  COMPOSITE ;  SURFACE
语种: 英语
WOS记录号: WOS:000317158800021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/137872
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Adv Rechargeable Batteries Lab, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

Recommended Citation:
Wang, Fuqing,Chen, Jian,Wang, Chong,et al. Fast sol-gel synthesis of mesoporous Li2MnSiO4/C nanocomposite with improved electrochemical performance for lithium-ion batteries[J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY,2013,688:123-129.
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