摘要
在锂离子电池(LIBs)和钠离子电池(SIBs)中,设计同时适用的负极材料,使其具有高倍率性能和超长循环寿命是亟需解决的工作。本文采用静电纺丝技术和硫化工程技术成功制备了一种均匀分布在N,S-掺杂炭纳米纤维上的MoO_(2)/MoS_(2)异质结构(MoO_(2)/MoS_(2)@NSC)。其中一维炭骨架作为导电框架可缩短Li^(+)/Na^(+)的扩散途径;炭纳米纤维中N/S杂原子的掺杂引入了丰富的活性位点,显著增强了离子扩散动力学。此外,在MoO_(2)相中通过原位形成的MoS_(2)纳米片强化了异质界面,MoO_(2)和MoS_(2)之间异质界面的构建使得Li^(+)/Na^(+)的快速传输成为实现高效储能的关键。因此,作为LIBs负极材料时,MoO_(2)/MoS_(2)@NSC电极在5.0 A g^(−1)的电流密度下循环2000圈后,仍具有640 mAh g^(−1)的优异放电比容量,每圈的容量衰减率仅为0.002%;在10.0 A g^(−1)的高电流密度下可达到614 mAh g^(−1)的放电比容量。对于SIBs,在2.0 A g^(−1)的电流密度下循环2000圈后其可逆容量仍能达到242 mAh g^(−1)。本工作采用一种新颖的界面调控策略来合理地设计负极材料,从而提高Li^(+)/Na^(+)储存动力学,实现超长寿命的循环性能。
It is imperative to design suitable anode materials for both lithium-ion(LIBs)and sodium-ion batteries(SIBs)with a high-rate performance and ultralong cycling life.We fabricated a MoO_(2)/MoS_(2)heterostructure that was then homogeneously distributed in N,S-doped carbon nanofibers(MoO_(2)/MoS_(2)@NSC)by electrospinning and sulfurization.The one-dimensional carbon fiber skeleton serves as a conductive frame to decrease the diffusion pathway of Li^(+)/Na^(+),while the N/S doping creates abundant active sites and significantly improves the ion diffusion kinetics.Moreover,the deposition of MoS_(2)nanosheets on the MoO_(2)bulk phase produces an interface that enables fast Li^(+)/Na^(+)transport,which is crucial for achieving high efficiency energy storage.Consequently,as the anode for LIBs,MoO_(2)/MoS_(2)@NSC gives an excellent cycling stability of 640 mAh g^(−1)for 2000 cycles under 5.0 A g^(−1)with an ultralow average capacity drop of 0.002%per cycle and an exceptional rate capability of 614 mAh g^(−1)at 10.0 A g^(−1).In SIBs,it also produces a significantly better electrochemical performance(reversible capacity of 242 mAh g^(−1)under 2.0 A g^(−1)for 2000 cycles and 261 mAh g^(−1)under 5.0 A g^(−1)).This work shows how introducing a novel interface in the anode can produce rapid Li^(+)/Na^(+)storage kinetics and a long cycling performance.
作者
张春晖
张家源
湛杰杨
于健
范林林
杨安平
刘红
高广刚
ZHANG Chun-hui;ZHANG Jia-yuan;ZHAN Jie-yang;YU Jian;FAN Lin-lin;YANG An-ping;LIU hong;GAO Guang-gang(Collaborative Innovation Center of Metal Nanoclusters&Photo/Electro-Catalysis and Sensing,School of Materials Science and Engineering,University of Jinan,Jinan 250022,China)
出处
《新型炭材料（中英文）》
SCIE
EI
CAS
CSCD
北大核心
2024年第2期308-320,共13页
New Carbon Materials
基金
国家自然科学基金(22201098)
山东省自然科学基金(ZR2021QB005)和济南市“新高校20条”资助项目(202228113).
关键词
多酸衍生物
异质结构
高倍率性能
锂离子电池
钠离子电池
Polyoxometalate derivatives
Heterostructure
High-rate performance
Lithium-ion storage
Sodium-ion storage
