Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 10, Issue 43, Pages 36892-36901Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b11062
Keywords
manganese tin oxides; nanoframes; Li-ion batteries; anodes; first-principles calculation
Funding
- National Science Foundation of China [21776121]
- Jiangsu Outstanding Youth Funds [BK20160012]
- National Materials Genome Project [2016YFB0700600]
- Nantong Fundamental Research Funds [GY12016040]
- Jiangsu Shuanchuang Program
- Thousand Youth Talents Plan
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The conversion reaction of lithia can push up the capacity limit of tin oxide-based anodes. However, the poor reversibility limits the practical applications of lithia in lithium-ion batteries. The latest reports indicate that the reversibility of lithia has been appropriately promoted by compositing tin oxide with transition metals. The underlying mechanism is not revealed. To design better anodes, we studied the nanostructured metal/Li2O interfaces through atomic-scale modeling and proposed a porous nanoframe structure of Mn/Sn binary oxides. The first-principles calculation implied that because of a low interface energy of metal/Li2O, Mn forms smaller particles in lithia than Sn. Ultrafine Mn nanoparticles surround Sn and suppress the coarsening of Sn particles. Such a composite design and the resultant interfaces significantly enhance the reversible Li-ion storage capabilities of tin oxides. The synthesized nanoframes of manganese tin oxides exhibit an initial capacity of 1620.6 mA h g(-1) at 0.05 A g(-1). Even after 1000 cycles, the nanoframe anode could deliver a capacity of 547.3 mA h g-1 at 2 A g-1. In general, we demonstrated a strategy of nanostructuring interfaces with low interface energy to enhance the Li-ion storage capability of binary tin oxides and revealed the mechanism of property enhancement, which might be applied to analyze other tin oxide composites.
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