碳包覆 NaVO 纳米管正极的优越钠离子存储：赝电容与插层。
Superior Sodium Storage of Carbon-Coated NaVO Nanotube Cathode: Pseudocapacitance Versus Intercalation.
机构信息
Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education, College of Chemistry , Xiangtan University , Hunan 411105 , P. R. China.
Institute of Advanced Electrochemical Energy & School of Materials Science and Engineering , Xi'an University of Technology , Xi'an , Shaanxi 710048 , P. R. China.
出版信息
ACS Appl Mater Interfaces. 2019 Mar 20;11(11):10631-10641. doi: 10.1021/acsami.8b20494. Epub 2019 Mar 6.
To realize the effect of Na pseudocapacitance on the sodium storage of cathode materials, clewlike carbon-coated sodium vanadium bronze (NaVO) nanotubes (Na-VBNT@C) were synthesized via a facile combined sol-gel/hydrothermal method. The resultant Na-VBNT@C delivers high reversible capacities of 209 and 105 mA h g at the rates of 0.1 and 10 C, respectively. Notably, at the higher rate of 5 C (1250 mA g), it can retain 94% of the initial capacity after 3000 cycles. It was found that the outstanding rate performance and the long-term cycling life of Na-VBNT@C are primarily due to the Na pseudocapacitance. Our study reveals that the design of Na pseudocapacitance is beneficial for harvesting the superior performance of NaVO cathode material in sodium-ion batteries.
为了实现正极材料中钠离子赝电容对钠存储的影响，我们通过简便的溶胶-凝胶/水热法合成了具有棒状碳涂层的钒酸钠青铜（Na-VBNT@C）纳米管。所得的 Na-VBNT@C 在 0.1 和 10 C 的倍率下分别表现出 209 和 105 mA h g 的高可逆容量。值得注意的是，在更高的倍率 5 C（1250 mA g）下，经过 3000 次循环后，它仍能保持初始容量的 94%。研究发现，Na-VBNT@C 出色的倍率性能和长期循环寿命主要归因于钠离子赝电容。我们的研究表明，设计钠离子赝电容有利于挖掘钠离子电池中 NaVO 正极材料的优异性能。
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