Journal
NANO ENERGY
Volume 40, Issue -, Pages 240-247Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2017.08.017
Keywords
Lithium sulfide; Indium triiodide; Energy density; Carbonized wipes; Full cell
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Funding
- Research Grants Council of the Hong Kong Special Administrative Region, China [16213414]
- National Key Basic Research Program of China [2014CB932400]
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Previous investigations have shown that high-energy lithium-ion sulfur batteries could be directly assembled with lithium sulfide (Li2S) cathode and a non-lithium anode. However, the existing lithium-ion sulfur battery suffers from the multistep sophisticated preparation process, high activation potential and also polysulfides corrosion to the anode. In this work, we propose and prepare a facile and feasible Li2S-based lithium-ion sulfur battery system, which is enabled by a bifunctional electrolyte additive. At first, Li2S particles were loaded on the low-cost carbonized commercial wipes by a solution-based infiltration method. Interestingly, for the first time, it is found that the well-designed indium triiodide (InI3) electrolyte additive not only performed as a cathodic redox mediator, reducing the activation potential of Li2S cathode, but also resulted in a passivation layer, preventing the anode from corrosion due to the shuttle effect. The obtained SnO2/Li2S full cell exhibits a stable electrochemical performance (983, 878, 746 and 675 mA h/g at 0.2, 0.4, 0.8, and 1.5 C, 647 mA h/g after 200 cycles at 0.5 C). Moreover, the manageable amount of lithium ions and the voltage cooperation between the cathode and anode in the full cell rendered the battery with a strong recovery ability against the abusive conditions test, such as over-charge, over-discharge and short-circuit, showing a great potential for practical use.
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