V_2O_5@C纳米片的沉淀法制备与电化学性能研究
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- 英文论文题名：Precipitation synthesized V_2O_5@C nanosheet as high-capacity anode material for Li-ion batteries
- 论文作者：王省超 ; 孙颖 ; 黄玉代 ; 贾殿赠
- 英文论文作者：Xingchao Wang ; Ying Sun ; Yudai Huang ; Dianzeng Jia ; Institute of Applied Chemistry ; University of Xinjiang ; Institute of Xinjiang Production Quality Inspection
- 年：2016
- 作者机构：新疆大学应用化学研究所;新疆产品质量监督检验研究院;
- 论文关键词：V_2O_5@C ; 纳米片 ; 沉淀法 ; 负极材料
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第三十分会：化学电源
- 语种：中文
- 分类号：TB383.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第三十分会 ; 化学电源
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：212k
- 原文格式：D
- 会议级别：全国
摘要
自Whittingham首次报道V_2O_5具有良好的电化学活性以来,V_2O_5引起了研究者的关注。最近研究发现,V_2O_5在0-3.0V间也表现出较好的电化学性能。V_2O_5+10Li~++10e~-■5Li_2O+2V。按此计算,在0-3.0V,V_2O_5材料可能具有1471 mAh g~(-1)的理论容量。该容量不仅是商用负极材料石墨理论容量的3倍,还高于其它过渡金属氧化物的理论容量~1。本文以商用V_2O_5为原料,在H_2O_2和乙酰丙酮等作用下生成VO(acac)_2微米片,再经微波加热,制备出V_2O_5@C纳米片复合材料,并对其结构和电化学进行研究。所制备材料为单分散的纳米片,且每个纳米片都以V_2O_5为核,碳层为壳构成。该结构不仅有利于电解液的扩散、电子与离子传输,而且大大提高材料的导电性能,抑制材料体积膨胀,表现出大的放电容量、良好的循环性能和优异的倍率容量。在0.5 Ag~(-1)下,V_2O_5@C纳米片具有860 mAh g~(-1)的可逆容量,且循环200次后仍表现出优异的倍率性能(在2.0和3.0 A g~(-1)下具有705 mAh g~(-1)和554 mAh g~(-1)的放电容量)。该材料突出的电化学性能归因于单分散的纳米片结构和碳包覆。
V_2O_5@C NS has been synthesized by a facile precipitation method.The phase structure and morphology of the sample were characterized systematically.The results demonstrate that thin carbon layer is successfully coated on the surface of V_2O_5 nanosheet.The thickness of the nanosheet is about 50 nm.Benefiting from the intrinsic increased conductivity of the V_2O_5@C NS and its robust nanosheet structure,the as-synthesized material used as an anode material exhibits large reversible discharge capacity(860 mAh g~(-1) at 0.5 A g~(-1)),good cycling performance(a high capacity of 802 mAh g~(-1) at 1.0 A g~(-1) after 200 cycles) and ultra-high rate capability(reversible capabilities of705 mAh g~(-1) at 2.0 A g~(-1),and 554 mAh g~(-1) at 3.0 A g~(-1),respectively).This work demonstrates a novel method for preparing vanadium-based nanosheets material for high-performance of lithium-ion batteries.
V_2O_5@C NS has been synthesized by a facile precipitation method.The phase structure and morphology of the sample were characterized systematically.The results demonstrate that thin carbon layer is successfully coated on the surface of V_2O_5 nanosheet.The thickness of the nanosheet is about 50 nm.Benefiting from the intrinsic increased conductivity of the V_2O_5@C NS and its robust nanosheet structure,the as-synthesized material used as an anode material exhibits large reversible discharge capacity(860 mAh g~(-1) at 0.5 A g~(-1)),good cycling performance(a high capacity of 802 mAh g~(-1) at 1.0 A g~(-1) after 200 cycles) and ultra-high rate capability(reversible capabilities of705 mAh g~(-1) at 2.0 A g~(-1),and 554 mAh g~(-1) at 3.0 A g~(-1),respectively).This work demonstrates a novel method for preparing vanadium-based nanosheets material for high-performance of lithium-ion batteries.
引文
[1]Wang,X.;Huang,Y.;Jia,D.;Pang,W K.Inorg.Chem.2015,54,11799-11806.