碳纤维
阴极
复合数
电解质
无机化学
X射线光电子能谱
电极
储能
纳米颗粒
功率密度
法拉第效率
作者
Bong Kyun Kang,Yoo Jung Choi,Hyung Wook Choi,Seok Bin Kwon,Suji Kim,You Jin Kim,Ji Sun Park,Woo Seok Yang,Dae Ho Yoon,Won-Hee Ryu
标识
DOI:10.1016/j.cej.2021.129630
摘要
The construction of a carbon-encapsulated multi-core nanostructure based on transition metal nitride is a preferred approach to efficiently mitigate volume expansion with improved sustainability and to enhance conductivity with more active sites for Li-ion cell reaction. Herein, we report the in-situ formation of carbon-coated nickel–cobalt nitride multi-core nanoparticles encapsulated by hollow N-doped carbon shell via monodispersed Ni3[Co(CN)6]2 Prussian blue analogue/polydopamine precursors using by simultaneous nitridation and calcination process. The (Ni/Co)3N multi-core nanoparticles (Ni:Co = 3:2) were highly dispersed in conductive and hollow N-doped carbon shell, thereby (i) mitigating mechanical stress by volume change during the conversion reaction of nitrides, (ii) stabilizing the electrochemical reaction surface with a thin solid electrolyte interphase, and (iii) maintaining the original structure and hierarchical morphologies even after long cycles. The (Ni/Co)3N [email protected] N-doped carbon shell demonstrated better electrochemical performance than the (Ni/Co)3[email protected] shell without the outer hollow N-doped carbon shell for the Li-ion battery anode, which has an excellent reversible capacity of ~440 mAh g−1 and a stable cycle life of 130 cycles at 200 mA g−1. The rational synthetic strategy of the unique hybrid nanoarchitecture via in-situ formation of polymer-coated metal–organic frameworks is key in improving the Li-ion storage capacity and cycle stability.
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