Rational design and in-situ formation of nickel-cobalt nitride multi-core/hollow N-doped carbon shell anode for Li-ion batteries
- Authors
- Kang, Bong Kyun; Choi, Yoo Jung; Choi, Hyung Wook; Kwon, Seok Bin; Kim, Suji; Kim, You Jin; Park, Ji Sun; Yang, Woo Seok; Yoon, Dae Ho; Ryu, Won-Hee
- Issue Date
- Sep-2021
- Publisher
- ELSEVIER SCIENCE SA
- Keywords
- Transition metal nitride; Prussian blue analogue; Polydopamine; N-doped carbon shell; Li-ion battery
- Citation
- CHEMICAL ENGINEERING JOURNAL, v.420, no.Part 1, pp 1 - 10
- Pages
- 10
- Journal Title
- CHEMICAL ENGINEERING JOURNAL
- Volume
- 420
- Number
- Part 1
- Start Page
- 1
- End Page
- 10
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/146376
- DOI
- 10.1016/j.cej.2021.129630
- ISSN
- 1385-8947
1873-3212
- Abstract
- 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 Ni-3[Co(CN)(6)](2) Prussian blue analogue/polydopamine precursors using by simultaneous nitridation and calcination process. The (Ni/Co)(3)N 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)(3)N multi-core@hollow N-doped carbon shell demonstrated better electrochemical performance than the (Ni/Co)(3) N@carbon shell without the outer hollow N-doped carbon shell for the Li-ion battery anode, which has an excellent reversible capacity of similar to 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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