Red@Black phosphorus core-shell heterostructure with superior air stability for high-rate and durable sodium-ion battery
Red@Black phosphorus core-shell heterostructure with superior air stability for high-rate and durable sodium-ion battery
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红@黑磷核壳异质结构具有优异的空气稳定性，可用于高倍率、耐用的钠离子电池
DOI：
10.1016/j.mattod.2022.08.013
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发表时间：
2022-10-01
期刊：
影响因子：
24.2
通讯作者：
Xiong, Xunhui
中科院分区：
文献类型：
--
作者：
Ma, Xiangdong;Ji, Chuang;Xiong, Xunhui
由于各个建筑组件和独特界面的协同效应，异质结构电极受到越来越多的关注。然而，工业用高面积容量和耐用的磷基异质结构阳极的合理设计和可控制造仍然是一个严峻的挑战。在此，通过一种简单的一步溶剂热策略制备了一种锚定在三维氮掺杂石墨烯上的新型红@黑磷核壳异质结构（RP@BP/3DNG）。实验数据和理论计算表明，由于RP@BP异质界面处内置电场，RP@BP/3DNG表现出优异的高电子电导率和极低的Na+扩散势垒，因此RP@BP/3DNG具有3.46 mAh cm(-2)的超高面积容量（0.05 A/g时为1440.2 mAh/g）和令人印象深刻的倍率性能（在0.05 A/g时为521.3 mAh/ g）。 10.0 A/g），并且在作为钠离子电池（SIB）负极进行评估时，在 10.0 A/g 下循环 1200 次后容量保持率达到前所未有的 89.3%。此外，RP@BP界面处的内部电场导致电子云从BP转移到RP，极大地抑制了BP原子孤对电子的反应活性，因此RP@BP/3DNG表现出大大增强的空气稳定性。这项工作预示着设计用于可充电电池的高性能和稳定的磷基阳极的新见解。
Heterostructured electrodes have gained increasing attentions owing to the synergistic effects from individual building components and the unique interfaces. However, rational design and controllable fabrication of high areal capacity and durable phosphorus-based heterostructure anode for industry remains a critical challenge. Herein, a new red@black phosphorus core-shell heterostructure anchored on three-dimensional N-doped graphene (RP@BP/3DNG) has been prepared via a facile one-step solvothermal strategy. As demonstrated by experimental data and theoretical calculations, RP@BP/3DNG shows a superior high electronic conductivity and an extremely low Na+ diffusion barrier due to the build-in filed at the RP@BP heterointerface, thus RP@BP/3DNG delivers an ultra-high areal capacity of 3.46 mAh cm(-2) (1440.2 mAh/g at 0.05 A/g), impressive rate performance (521.3 mAh/ g at 10.0 A/g) as well as unprecedented capacity retention rate of 89.3% after 1200 cycles at 10.0 A/g when evaluated as an anode for sodium ion batteries (SIBs). Furthermore, the internal electric field at the interfaces of RP@BP leads to the shift of electron cloud from BP to RP, which greatly suppresses the reaction activity of lone-pair electrons of BP atoms, and therefore RP@BP/3DNG shows much enhanced air stability. This work heralds a new insight for designing high-performance and stable P-based anodes for rechargeable batteries.