Ad Hoc Solid Electrolyte On Acidized Carbon Nanotube Paper Improves Cycle Life Of Lithium-Sulfur Batteries

Abstract

The performance of lithium-sulfur (Li-S) batteries is greatly improved by using acidized carbon nanotube paper (ACNTP) to induce in situ polymerization of ether-based DOL/DME liquid to grow an ion-selective solid barrier, to seal in soluble polysulfides on the cathode side. The Li-S battery with the in situ barrier showed an initial specific capacity of 683 mA h g-1 at a high current density of 1675 mA g-1, and maintained a discharge capacity of 454 mA h g-1 after 400 cycles. The capacity decay rate was 0.1% per cycle and a high Coulombic efficiency of 99% was achieved. Experimental characterizations and theoretical models demonstrate the in situ polymerized solid barrier stops sulfur transport while still allowing bidirectional Li+ transport, alleviating the shuttle effect and increasing the cycling performance. The soft and sticky nature of the solid electrolyte barrier makes it a good sealant, forming an enclosed catholyte chamber on the sulfur side.

Publication Date

12-1-2017

Publication Title

Energy and Environmental Science

Volume

10

Issue

12

Number of Pages

2544-2551

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1039/c7ee01898c

Socpus ID

85038597758 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85038597758

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