原位碳包覆的超薄V_3O_7·H_2O纳米带用作高能量、长寿命锂离子电池正极材料
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- 英文论文题名：Ultrathin Nanoribbons of In-Situ Carbon-Coated V_3O_7·H_2O for High-Energy and Long-Life Li-Ion Batteries
- 论文作者：朱孔军 ; 刘鹏程
- 英文论文作者：Kongjun Zhu ; Pengcheng Liu ; State Key Laboratory of Mechanics and Control of Mechanical Structures ; Nanjing University of Aeronautics and Astronautics
- 年：2016
- 作者机构：机械结构力学及控制国家重点实验室;
- 论文关键词：锂离子电池 ; 氧化钒 ; 能量密度 ; 电化学反应 ; 碳包覆
- 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;TM912
- 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：2
- 文件大小：258k
- 原文格式：D
- 会议级别：全国
摘要
随着纯电动汽车等大规模储能领域的快速发展,锂离子电池技术迎来了新的挑战和机遇:需要更高能量密度和更长循环寿命[1-3]。因此,本文基于一种新颖的水热高温混合技术,原位合成了一种碳包覆的超薄V_3O_7·H_2O纳米带,实验结果表明V_3O_7·H_2O@C纳米带是一种极具潜力的高能量、高功率、长寿命的锂离子电池正极材料。当充放电电流密度为100 mA/g时,其放电比容量高达319 mAh/g。当电流密度增加到500mA/g时,它的容量仍可达262 mAh/g,并且经过100次循环后仍有94%的容量可以被保持。更当电流密度增加到3000 mA/g时,仍有165 mAh/g的容量可以被获得,并且经过600次长循环后其容量保持率高达119%。更为重要的是,V_3O_7·H_2O@C纳米带的能量密度高达800 Wh/kg,比其它传统的正极材料(如LiCoO_2,LiMn_2O_4and LiFePO_4)高出48-60%。更当功率密度高达8000 W/kg时,其能量密度仍可达355 Wh/kg。此外,基于ex-situ XRD技术,本文首次提出了V_3O_7·H_2O的电化学反应机制。更为有趣的是,本文的实验结果还表明这种V_3O_7·H_2O@C纳米带还是一种非常具有潜力的钠离子电池正极材料。
The ever-growing demands of Li-ion batteries(LIBs) for high-energy and long-life applications such as electrical vehicles have prompted great research interests.Herein,by applying one-step high-temperature mixing method under hydrothermal conditions,ultrathin V_3O_7·H_2O@C nanoribbons with good crystallinity and robust configuration are in-situ synthesized.Their capacity is up to 319 mAh/g at a current density of 100 mA/g.Even at large 3000 mA/g,they can still deliver a high capacity of 165 mAh/g,and 119%of initial capacity can be kept after600 cycles.Importantly,their energy density is up to 800 Wh/kg,which is much higher than those of conventional cathode materials,and can be kept as 355 Wh/kg at a high power density of 8000 W/kg.Furthermore,their exact electrochemical reaction mechanism is reasonably described for the first time through ex-situ XRD technology.Excitingly,as-synthesized V_3O_7·H_2O@C nanoribbons are also great promising cathode materials for Na-ion batteries.
The ever-growing demands of Li-ion batteries(LIBs) for high-energy and long-life applications such as electrical vehicles have prompted great research interests.Herein,by applying one-step high-temperature mixing method under hydrothermal conditions,ultrathin V_3O_7·H_2O@C nanoribbons with good crystallinity and robust configuration are in-situ synthesized.Their capacity is up to 319 mAh/g at a current density of 100 mA/g.Even at large 3000 mA/g,they can still deliver a high capacity of 165 mAh/g,and 119%of initial capacity can be kept after600 cycles.Importantly,their energy density is up to 800 Wh/kg,which is much higher than those of conventional cathode materials,and can be kept as 355 Wh/kg at a high power density of 8000 W/kg.Furthermore,their exact electrochemical reaction mechanism is reasonably described for the first time through ex-situ XRD technology.Excitingly,as-synthesized V_3O_7·H_2O@C nanoribbons are also great promising cathode materials for Na-ion batteries.
引文
[1]Li,L.;Liu P,Zhu K,Wang,J.;Liu,J.;Qiu,J.J.Mater.Chem.A,2015,3:9385.
[2]Liu,P.,Zhou,D.,Zhu,K.,Wu,Q.,Wang,Y.,Tai,G.,Gu,Q.Nanoscale,2016,8:1975.
[3]Liu,P.,Zhu,K.,Gao,Y.,Wu,Q.,Liu,J.,Qiu,J.,Zheng,H.CrystEngComm,2013,15:2753.
[2]Liu,P.,Zhou,D.,Zhu,K.,Wu,Q.,Wang,Y.,Tai,G.,Gu,Q.Nanoscale,2016,8:1975.
[3]Liu,P.,Zhu,K.,Gao,Y.,Wu,Q.,Liu,J.,Qiu,J.,Zheng,H.CrystEngComm,2013,15:2753.