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Improved Specific Capacity of Nb2O5 by Coating on Carbon Materials for Lithium‐Ion Batteries
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-09-21 , DOI: 10.1002/celc.201801001 Fan Yang 1 , Weiyang Li 1 , Yichuan Rui 1 , Bohejin Tang 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2018-09-21 , DOI: 10.1002/celc.201801001 Fan Yang 1 , Weiyang Li 1 , Yichuan Rui 1 , Bohejin Tang 1
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Materials for lithium‐ion batteries (LIBs) with excellent electrochemical performance are of significance to meet the increasing demand for rechargeable batteries. Niobium pentoxide (Nb2O5), as an intercalation material with promising electrochemical properties has caught our attention. In this study, Nb2O5 nanoparticles were successfully synthesized through a classical sol‐gel process. The nanoparticles with a size of less than 5 nm were uniformly coated on carbon materials, i. e., reduced graphene oxide (rGO) and three‐dimensionally ordered macroporous (3DOM) carbon, under the same proportion, to explore which kind of carbon materials is more suitable to improve the electrochemical performance of Nb2O5 as an anode for LIBs. Nb2O5/3DOM carbon composite exhibited a superior electrochemical performance to the other two materials, where a high reversible capacity of 519 mA h g−1 could be maintained at the current density of 5.0C (C=201.7 mA g−1). Furthermore, the specific capacity of Nb2O5/3DOM carbon composite maintained 1163 mA h g−1 at the current density of 0.2C (C=201.7 mA g−1) after 100 cycles.
中文翻译：
通过在锂离子电池的碳材料上进行涂层来提高Nb2O5的比容量
具有优异电化学性能的锂离子电池（LIB）材料对于满足对可充电电池日益增长的需求具有重要意义。五氧化二铌（Nb 2 O 5）作为具有良好电化学性能的插层材料备受关注。在这项研究中，Nb 2 O 5纳米粒子是通过经典的溶胶-凝胶过程成功合成的。将尺寸小于5nm的纳米颗粒均匀地涂覆在碳材料上，即碳纳米管上。例如，以相同比例还原氧化石墨烯（rGO）和三维有序大孔（3DOM）碳，以探索哪种碳材料更适合改善Nb 2 O的电化学性能5作为LIB的阳极。Nb 2 O 5 / 3DOM碳复合材料表现出优于其他两种材料的电化学性能，在5.0C的电流密度下（C = 201.7 mA g -1）可以保持519 mA h g -1的高可逆容量。此外，在100个循环之后，在0.2C的电流密度（C ＝ 201.7mA g -1）下，Nb 2 O 5 / 3DOM碳复合材料的比容量保持1163 mA h g -1。
更新日期：2018-09-21
中文翻译：
通过在锂离子电池的碳材料上进行涂层来提高Nb2O5的比容量
具有优异电化学性能的锂离子电池（LIB）材料对于满足对可充电电池日益增长的需求具有重要意义。五氧化二铌（Nb 2 O 5）作为具有良好电化学性能的插层材料备受关注。在这项研究中，Nb 2 O 5纳米粒子是通过经典的溶胶-凝胶过程成功合成的。将尺寸小于5nm的纳米颗粒均匀地涂覆在碳材料上，即碳纳米管上。例如，以相同比例还原氧化石墨烯（rGO）和三维有序大孔（3DOM）碳，以探索哪种碳材料更适合改善Nb 2 O的电化学性能5作为LIB的阳极。Nb 2 O 5 / 3DOM碳复合材料表现出优于其他两种材料的电化学性能，在5.0C的电流密度下（C = 201.7 mA g -1）可以保持519 mA h g -1的高可逆容量。此外，在100个循环之后，在0.2C的电流密度（C ＝ 201.7mA g -1）下，Nb 2 O 5 / 3DOM碳复合材料的比容量保持1163 mA h g -1。
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