Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 140, Issue 8, Pages 3134-3138Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.8b00411
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Funding
- National 973 Program [2015CB251102]
- Key Project of NSFC [U1305246, 2167319, 21621091, 21773192]
- Fundamental Research Funds for the Central Universities [20720150042, 20720150043]
- EPSRC [EP/J015156/1, EP/K021966/1, EP/K023004/1]
- ERC [670467 SMART-POM]
- Engineering and Physical Sciences Research Council [EP/C542819/1, EP/L023652/1, EP/K023004/1, EP/L015668/1, EP/K021966/1, EP/H024107/1, EP/J015156/1, EP/J00135X/1, EP/K038885/1, EP/I033459/1, EP/R020914/1] Funding Source: researchfish
- EPSRC [EP/R020914/1, EP/J00135X/1, EP/H024107/1, EP/L015668/1, EP/C542819/1, EP/L023652/1, EP/K038885/1, EP/I033459/1] Funding Source: UKRI
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Investigations of the Ag (I)-substituted Keggin K-3[(H3AgPW11O39)-P-I] as a bifunctional Lewis acidic and basic catalyst are reported that explore the stabilization of Li2Sn moieties so that reversible redox reactions in S-based electrodes would be possible. Spectroscopic investigations showed that the Li2Sn-moieties can be strongly adsorbed on the {(AgPW11O39)-P-I} cluster, where the Ag(I) ion can act as a Lewis acid site to further enhance the adsorption of the S-moieties, and these interactions were investigated and rationalized using DFT. These results were used to construct an electrode for use in a Li-S battery with a very high S utilization of 94%, and a coulometric capacity of 1580 mAh g(-1). This means, as a result of using the AgPOM, both a high active S content, as well as a high areal S mass loading, is achieved in the composite electrode giving a highly stable battery with cycling performance at high rates (1050 and 810 mAh g(-1) at 1C and 2C over 100 to 300 cycles, respectively).
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