| 通过构筑嵌覆型碳结构提升Nb2O5的储锂性能 |
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| 引用本文： | 姬青,徐隹军,杲祥文,程亚军,王晓艳,左秀霞,陈政,胡斌杰,朱锦,Peter G.Bruce,夏永高. 通过构筑嵌覆型碳结构提升Nb2O5的储锂性能[J]. SCIENCE CHINA Materials, 2021, 0(5): 1071-1086 |
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| 作者姓名： | 姬青 徐隹军 杲祥文 程亚军 王晓艳 左秀霞 陈政 胡斌杰 朱锦 Peter G.Bruce 夏永高 |
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| 作者单位： | Ningbo Institute of Materials Technology and Engineering;The University of Nottingham Ningbo China;University of Chinese Academy of Sciences;Department of Materials;Materials Science and Engineering Program and Texas Materials Institute;University of Nottingham;The Henry Royce Institute;The Faraday Institution;Center of Materials Science and Optoelectronics Engineering |
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| 基金项目： | supported by the National Key R&D Program of China(2016YFB0100100);the National Natural Science Foundation of China(51702335 and 21773279);Zhejiang Non-profit Technology Applied Research Program(LGG19B010001);Ningbo Municipal Natural Science Foundation(2018A610084);the CAS-EU S&T Cooperation Partner Program(174433KYSB20150013);the Key Laboratory of Bio-based Polymeric Materials of Zhejiang Province;the funding from Marie Sklodowska-Curie Fellowship in EU;the Engineering and Physical Sciences Research Council(EPSRC),including the SUPERGEN Energy Storage Hub(EP/L019469/1);Enabling Next Generation Lithium Batteries(EP/M009521/1);Henry Royce Institute for Advanced Materials(EP/R00661X/1,EP/S019367/1,EP/R010145/1);the Faraday Institution All-Solid-State Batteries with Li and Na Anodes(FIRG007,FIRG008)for financial support。 |
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| 摘 要： | 嵌入型过渡金属氧化物因具有安全的工作电压、高比容量和快速的嵌锂能力而受到广泛关注.但低本征电导率特性严重影响其作为锂电负极材料的寿命和性能.本文通过简便易行、可规模化放大的二氧化碳热处理方法构筑了具有新型嵌覆型碳结构的Nb2O5/C纳米杂化材料.在控制碳含量的前提下,实现了颗粒聚集体内部表面可控碳包覆.以嵌覆型碳结构的Nb2O5/C纳米杂化材料为负极组装的锂离子电池在40 mA g(-1)电流密度下容量可达387 mA hg(-1),而在200 mA g(-1)电流密度下循环500次后,容量保持率在92%以上.采用电化学滴定、差分电化学质谱(DEMS)等方法对嵌覆型五氧化二铌/碳纳米杂化材料脱嵌锂动力学过程以及产气行为进行了研究.本文提出的嵌覆型碳结构有望为高性能嵌入型过渡金属氧化物的结构设计提供参考.
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| 关 键 词： | 锂离子电池 过渡金属氧化物 负极材料 储锂性能 纳米杂化材料 五氧化二铌 热处理方法 碳结构 |
Carbon-emcoating architecture boosts lithium storage of Nb2O5 |
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| Qing Ji,Zhuijun Xu,Xiangwen Gao,Ya-Jun Cheng,Xiaoyan Wang,Xiuxia Zuo,George Z.Chen,Binjie Hu,Jin Zhu,Peter G.Bruce,Yonggao Xia. Carbon-emcoating architecture boosts lithium storage of Nb2O5[J]. , 2021, 0(5): 1071-1086 |
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| Authors: | Qing Ji Zhuijun Xu Xiangwen Gao Ya-Jun Cheng Xiaoyan Wang Xiuxia Zuo George Z.Chen Binjie Hu Jin Zhu Peter G.Bruce Yonggao Xia |
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| Affiliation: | (Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences,Ningbo 315201,China;The University of Nottingham Ningbo China,Ningbo 315100,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Materials,University of Oxford,Parks Rd,OX13PH,Oxford,United Kingdom;Materials Science and Engineering Program and Texas Materials Institute,University of Texas at Austin,Austin,TX 78712,USA;University of Nottingham,University Park,Nottingham NG72RD,United Kingdom;The Henry Royce Institute,Parks Road,Oxford OX13PH,United Kingdom;The Faraday Institution,Quad One,Becquerel Avenue,Harwell Campus,Didcot OX11 OR1,United Kingdom;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China) |
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| Abstract: | Intercalation transition metal oxides (ITMO)have attracted great attention as lithium-ion battery negative electrodes due to high operation safety,high capacity and rapid ion intercalation.However,the intrinsic low electron conductivity plagues the lifetime and cell performance of the ITMO negative electrode.Here we design a new carbon-emcoating architecture through single CO2activation treatment as demonstrated by the Nb2O5/C nanohybrid.Triple structure engineering of the carbon-emcoating Nb2O5/C nanohybrid is achieved in terms of porosity,composition,and crystallographic phase.The carbon-embedding Nb2O5/C nanohybrids show superior cycling and rate performance compared with the conventional carbon coating,with reversible capacity of 387 m A h g(-1)at 0.2 C and 92%of capacity retained after 500cycles at 1 C.Differential electrochemical mass spectrometry(DEMS) indicates that the carbon emcoated Nb2O5nanohybrids present less gas evolution than commercial lithium titanate oxide during cycling.The unique carbon-emcoating technique can be universally applied to other ITMO negative electrodes to achieve high electrochemical performance. |
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| Keywords: | niobium pentoxide/carbon nanohybrids mesoporous CO2activation emcoating lithium-ion battery negative electrode |
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