Journal
ACS NANO
Volume 10, Issue 11, Pages 10211-10219Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b05566
Keywords
2D layered SnS2; self-branched structure; pseudocapacitance; high rate and areal capacity; sodium-ion battery; unsaturated-edge effect
Categories
Funding
- Ministry of Education [M4011424.110, M4020284.110]
- NSF of China [51307046]
- NSF of Heilongjiang Province [E2016062]
- Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry [20151098]
- Heilongjiang Province [2015424]
- University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province [2015082]
- Open Project Program of the Key Laboratory for Photonic and Electric Band Gap Materials of the Ministry of Education of Harbin Normal University [PEBM201405]
- Russian Science Foundation [14-43-00072]
- Russian Science Foundation [14-43-00072] Funding Source: Russian Science Foundation
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The abundant reserve and low cost of sodium have provoked tremendous evolution of Na-ion batteries (SIBs) in the past few years, but their performances are still limited by either the specific capacity or rate capability. Attempts to pursue high rate ability with maintained high capacity in a single electrode remains even more challenging. Here, an elaborate self-branched 2D SnS2 (B-SnS2) nanoarray electrode is designed by a facile hot bath method for Na storage. This interesting electrode exhibits areal reversible capacity of ca. 3.7 mAh cm(-2) (900 mAh g(-1)) and rate capability of 1.6 mAh cm(-2) (400 mAh g(-1)) at 40 mA cm(-2) (10 A g(-1)). Improved extrinsic pseudocapacitive contribution is demonstrated as the origin of fast kinetics of an alloying-based SnS2 electrode. Sodiation dynamics analysis based on first-principles calculations, ex-situ HRTEM, in situ impedance, and in situ Raman technologies verify the S-edge effect on the fast Na+ migration and reversible and sensitive structure evolution during high-rate charge/discharge. The excellent alloying-based pseudocapacitance and unsaturated edge effect enabled by self-branched surface nano engineering could be a promising strategy for promoting development of SIBs with both high response.
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