A three-dimensional hierarchical structure of cyclized-PAN/Si/Ni for mechanically stable silicon anodes
- Beijing Institute of Technology, Beijing (China)
- Beijing Institute of Technology, Beijing (China); National Development Center of High Technology Green Materials, Beijing (China); Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing (China)
- Beijing Institute of Technology, Beijing (China); National Development Center of High Technology Green Materials, Beijing (China)
- Argonne National Lab. (ANL), Lemont, IL (United States)
Here, the main challenges associated with silicon anodes are their poor conductivity and severe structural degradation during cycling. Here we design a three-dimensional sandwich hierarchical structure that tackles these problems, and we demonstrate its use in flexible, large-area silicon anode assemblies. The design of the electrode is achieved via plasma enhanced chemical vapor deposition of silicon nanoparticles onto three-dimensional nickel foam followed by conformal coating of cyclized-PAN on the silicon surface, thus forming a sandwiched cyclized-PAN/Si/Ni hierarchical structure. The three-dimensional networks provide abundant electroactive zones and conductive transport paths, the conformal coating of cyclized-PAN accommodates volume change during cycling, and the monolithic electrode configuration without additional binders or conductive agents improves the energy density of the whole electrode. Furthermore, as a result of the sandwich hierarchical arrangement, the solid-electrolyte interface of the anode remains stable and spatially confined, leading to an increased reversible capacity and improved cycling stability (910 mA h g–1 after 100 cycles at 1.0 A g–1).
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1461409
- Journal Information:
- Journal of Materials Chemistry. A, Vol. 5, Issue 47; ISSN 2050-7488
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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