Lin Jianping, Ruan Lingfang, Wu Jiasheng, Yang Wenyu, Huang Xiaohui, Huang Zhiqiang, Ying Shaoming, Lin Zhiya
College of mathematics and Physics, Ningde Normal University, Ningde, 352100, China.
College of Chemistry and Materials, Ningde Normal University, Fujian Provincial Key Laboratory of Featured Materials in Biochemical Industry, Ningde, 352100, China.
Phys Chem Chem Phys. 2022 Dec 14;24(48):29520-29527. doi: 10.1039/d2cp03309g.
Ferric oxide (FeO) is an attractive anode material for lithium-ion batteries (LIBs) with a high theoretical capacity of 1005 mA h g. However, its practical application is greatly restrained by the rapid capacity fading caused by the large volume expansion upon lithiation. To address this issue, we have designed and synthesized a unique yolk-shell FeO/N-doped carbon hybrid structure (YS-FeO@NC) with rich oxygen vacancies for robust lithium storage. The obtained results show that YS-FeO@NC delivers a high reversible capacity of 578 mA h g after 300 cycles at a current density of 5 A g, about 11 times that (53.7 mA h g) of pristine FeO. Furthermore, a high specific capacity of 300.5 mA h g even at 10 A g is achieved. The high reversible capacities, excellent rate capability and cycle stability of YS-FeO@NC might be attributed to the elaborate yolk-shell nanoarchitecture. Moreover, electron percolation and a local built-in electric field induced by oxygen vacancies in the FeO matrix could also enhance the kinetics of Li insertion/deinsertion.
氧化铁（FeO）是一种具有吸引力的锂离子电池（LIBs）负极材料，其理论比容量高达1005 mA h g。然而，由于锂化过程中体积大幅膨胀导致容量快速衰减，其实际应用受到极大限制。为解决这一问题，我们设计并合成了一种独特的具有丰富氧空位的蛋黄壳结构FeO/N掺杂碳复合材料（YS-FeO@NC），用于稳定的锂存储。所得结果表明，YS-FeO@NC在5 A g的电流密度下循环300次后，可逆比容量高达578 mA h g，约为原始FeO（53.7 mA h g）的11倍。此外，即使在10 A g的电流密度下，仍能实现300.5 mA h g的高比容量。YS-FeO@NC的高可逆容量、优异的倍率性能和循环稳定性可能归因于其精细的蛋黄壳纳米结构。此外，FeO基体中的氧空位引起的电子渗流和局部内建电场也可以增强锂嵌入/脱出的动力学。
