储能科学与技术2023，Vol.12Issue(9)：2715-2726,12.DOI:10.19799/j.cnki.2095-4239.2023.0273
不同杂原子掺杂钛酸钠对储钠性能的影响
The effect of different heteroatoms-doped Na2Ti3O7 on sodium ion storage
摘要
Abstract
Sodium-ion batteries(SIBs)are promising energy storage devices because of their low cost and high safety compared with traditional lithium-ion batteries(LIBs).The electrochemical performance of the electrode material determines the whole battery's function.As sodium ion's radius is larger than lithium ion's,the ion embedding/removal is relatively slow,and the electrode material is prone to structural damage after multiple cycles,resulting in capacity decay.Therefore,high energy density and long-life electrode materials are the breakthroughs to achieve high-performance SIBs.Meanwhile,the battery energy storage mechanism and electrode reaction dynamics still need to be further explored.Given the above problems,designing advanced cathode materials to achieve a good match with the existing positive electrodes is one of the urgent problems to be solved in developing high-performance SIBs to improve the energy density and cyclic life of the battery.The TiO6 octahedrons were connected to each other by corners or edges to form tunnel-and layer-structured sodium titanates(NTO).This open structure made NTO promising anode materials for SIBs.In this work,we compared the electrochemical behavior difference of P-and S-doped NTO as anode materials for SIBs.We found that phosphorus-doped NTO(P-NTO)had excellent electrochemical performance compared with sulfur-doped NTO(S-NTO);when it was used as an electrode for SIBs,it exhibited outstanding long-term cycling stability and rate performance.When the current density was high,up to 2000 mA/g,the P-NTO delivered a reversible capacity of 111 mAh/g.Even after 1300 cycles(500 mA/g),the electrode retained a capacity of 150 mAh/g.These excellent performances are mainly attributed to the open structure of NTO,and doping P drastically boosted the electron movement within the nanosheets.关键词
杂原子/掺杂/钛酸钠/储钠性能Key words
heteroatoms/doping/Na2Ti3O7 nanosheets/sodium ion storage分类
数理科学引用本文复制引用
葛金雨,孟祥辉,祁永军,孙浩,李健君,周冰,桂亭亭,邢庆伟,黄曼..不同杂原子掺杂钛酸钠对储钠性能的影响[J].储能科学与技术,2023,12(9):2715-2726,12.基金项目
氧缺陷诱导Bi/TiO2-x异质结构界面键合及内电场联合调控储钠性能研究(52202239). （52202239）
