Journal
CHEMICAL ENGINEERING JOURNAL
Volume 346, Issue -, Pages 57-64Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2018.04.049
Keywords
Lithium sulfur battery; Lithium sulfide cathode; Spray-dried technology; Electron and ion conductivity; In-situ electrochemical impedance spectra
Categories
Funding
- National Natural Science Foundation of China [2127318, 21621091]
- National Found for Fostering Talents of Basic Science [J1310024]
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Lithium sulfide (Li2S) cathode is considered as a prospective substitution for sulfur-based cathode for as its high specific capacity. Despite this, the poor electron and lithium ion transportation for Li2S impedes its further development. Herein, a great electron and lithium ion pathway is constructed for Li2S by a facile spray-dried technology. In this composite, the nano-sized Li2S is well imbedded in framework composed by the nitrogen/oxygen dual doped carbon nanotube/carbon (Li2S/CNT/C-N/O). The electrochemical tests show that the prepared Li2S/CNT/C-N/O cathode exhibits great cycling stability and rate capacity. A high initial discharge capacity of 1014 mAh g(-1) is achieved with 671 mAh g(-1) capacity remained at 200 mA g(-1) after 200 cycles. Impressively, a stable capability is still exhibited from 200 to 3000 mA g(-1) during rate testing. In-situ electrochemical impedance spectra test is further used to get insightful understanding about the improvements. The result reveals that decreased resistance and increased lithium-ion diffusion can be achieved for the Li2S/CNT/CN/O, especially at the initial charging stage of polysulfides nucleation, which shed light on the improved reactive kinetics and active material utilization.
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