Constructing Novel Si@SnO2 Core–Shell Heterostructures by Facile Self-Assembly of SnO2 Nanowires on Silicon Hollow Nanospheres for Large, Reversible Lithium Storage
- 8 March 2016
- journal article
- research article
- Published by American Chemical Society (ACS) in ACS Applied Materials & Interfaces
- Vol. 8 (11), 7092-7100
- https://doi.org/10.1021/acsami.6b00107
Abstract
Developing an industrially viable silicon anode, featured by the highest theoretical capacity (4200 mA h g(-1)) among common electrode materials, is still a huge challenge because of its large volume expansion during repeated lithiation-delithiation as well as low intrinsic conductivity. Here, we expect to address these inherent deficiencies simultaneously with an interesting hybridization design. A facile self-assembly approach is proposed to decorate silicon hollow nanospheres with SnO2 nanowires. The two building blocks, hand in hand, play a wonderful duet by bridging their appealing functionalities in a complementary way: (1) The silicon hollow nanospheres, in addition to the major role as a superior capacity contributor, also act as a host material (core) to partially accommodate the volume expansion, thus alleviating the capacity fading by providing abundant hollow interiors, void spaces, and surface areas. (2) The SnO2 nanowires serve as a conductive coating (shell) to enable efficient electron transport due to a relatively high conductivity, thereby improving the cyclability of silicon. Compared to other conductive dopants, the SnO2 nanowires with a high theoretical capacity (790 mA h g(-1)) can contribute outstanding electrochemical reaction kinetics, further adding value to the ultimate electrochemical performances. The resulting novel Si@SnO2 core-shell heterostructures exhibit remarkable synergy in large, reversible lithium storage, delivering a reversible capacity as high as 1869 mA h g(-1)@500 mA g(-1) after 100 charging-discharging cycles.Keywords
Funding Information
- Ministry of Education of the People's Republic of China (20120002130012)
- China Postdoctoral Science Foundation (2015M580095)
- National Natural Science Foundation of China (21274079, 21304053)
This publication has 70 references indexed in Scilit:
- Metal–Organic Frameworks (MOFs) as Sandwich Coating Cushion for Silicon Anode in Lithium Ion BatteriesACS Applied Materials & Interfaces, 2015
- Hollow Structured Silicon Anodes with Stabilized Solid Electrolyte Interphase Film for Lithium-Ion BatteriesACS Applied Materials & Interfaces, 2015
- Rational material design for ultrafast rechargeable lithium-ion batteriesChemical Society Reviews, 2015
- Nanometer-scale Sn coatings improve the performance of silicon nanowire LIB anodesJournal of Materials Chemistry A, 2014
- Role of Surface Functionality in the Electrochemical Performance of Silicon Nanowire Anodes for Rechargeable Lithium BatteriesACS Applied Materials & Interfaces, 2014
- Scalable synthesis of silicon nanosheets from sand as an anode for Li-ion batteriesNanoscale, 2014
- Preparation of Silicon@Silicon Oxide Core–Shell Nanowires from a Silica Precursor toward a High Energy Density Li-Ion Battery AnodeACS Applied Materials & Interfaces, 2013
- A nano-Si/FeSi2Ti hetero-structure with structural stability for highly reversible lithium storageNanoscale, 2013
- Toward Silicon Anodes for Next-Generation Lithium Ion Batteries: A Comparative Performance Study of Various Polymer Binders and Silicon NanopowdersACS Applied Materials & Interfaces, 2013
- Interconnected Silicon Hollow Nanospheres for Lithium-Ion Battery Anodes with Long Cycle LifeNano Letters, 2011