钠离子电池正极材料Na4Fe3-xCrx(PO4)2P2O7/C@CNT的制备及电化学性能研究
Preparation and electrochemical property study of Na4Fe3-xCrx(PO4)2P2O7/C@CNT cathode materials for sodium ion battery
王贵海 1陈彤彤 2陈杰 1张梓尧 1甄川 1韩现英 2李建刚2
作者信息
- 1. 北京电力自动化设备有限公司,北京 100089
- 2. 北京石油化工学院新材料与化工学院,北京 102617
- 折叠
摘要
为改善钠离子电池正极材料Na4Fe3(PO4)2P2O7 的导电性,提高其充放电性能,采用Cr3+掺杂提高正极材料本征导电性,采用包覆碳和复合碳纳米管(CNT)构筑高效导电网络以加快纳米活性物颗粒间的电子传导,制备并探究了Na4Fe3-xCrx(PO4)2P2O7/C@CNT复合材料的结构与电化学性能.结果表明,当Cr3+掺杂量x为 0.075、CNT添加质量分数为 3％时,所制备材料表现出较小的电荷传递阻抗和优异的高倍率充放电性能.其 0.1C和 20C倍率下的放电比容量分别达到 120.64 mAh/g和 87.11 mAh/g,10 C倍率下循环 500 次后容量保持率高达92.37％.
Abstract
In order to improve the conductivity and electrochemical performance of Na4Fe3(PO4)2P2O7 cathode material for sodium-ion battery,it is doped with Cr3+ions to improve its intrinsic conductivity,and coated by carbon and composite carbon nanotube(CNT)to build an efficient conductive network to accelerate the electronic conduction between nano active particles.Finally,Na4Fe3-xCrx(PO4)2P2O7/C@CNT composite material is obtained and its electrochemical performance is investigated.The results show that the prepared material exhibits smaller charge transfer impedance and excellent charge-discharge performance at high rate when the doping amount of Cr3+is 0.075 and the addition amount of CNT is 3％.Its discharge specific capacity reaches 120.64 mAh·g-1 and 87.11 mAh·g-1,respectively at 0.1C and 20 C rates,and its capacity retention achieves 92.37％after 500 cycles at 10 C rate.
关键词
钠离子电池/正极材料/Na4Fe3(PO4)2P2O7/Cr3+掺杂/碳纳米管Key words
sodium ion battery/cathode material/Na4Fe3(PO4)2P2O7/Cr3+doping/carbon nanotube引用本文复制引用
基金项目
北京市教委科研项目(KM202310017003)
出版年
2024
NETL
NSTL
万方数据