In Situ Generated Li<sub>2</sub>S-C Nanocomposite for High-Capacity and Long-Life All-Solid-State Lithium Sulfur Batteries with Ultrahigh Areal Mass Loading.
basic_science · Level V
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- Record sourced from PubMed, PMID 31009570.
- Also identified by DOI 10.1021/acs.nanolett.9b00882.
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Abstract
All-solid-state lithium-sulfur batteries (ASSLSBs) have attracted great attention due to their inherent ability to eliminate the two critical issues (polysulfide shuttle effect and safety) of traditional liquid electrolyte based Li-S batteries. However, it remains a huge challenge for ASSLSBs to achieve high areal active mass loading and high active material utilization simultaneously due to the insulating nature of sulfur and Li<sub>2</sub>S, and the large volume change during cycling. Herein, a Li<sub>2</sub>S@C nanocomposite with Li<sub>2</sub>S nanocrystals uniformly embedded in conductive carbon matrix, is in situ generated by the combustion of lithium metal with CS<sub>2</sub>. Benefiting from its unique architecture, the Li<sub>2</sub>S@C exhibits exceptional electrochemical performance as cathode for ASSLSBs, with both ultrahigh areal Li<sub>2</sub>S loading (7 mg cm<sup>-2</sup>) and 91% of Li<sub>2</sub>S utilization (corresponding to a reversible capacity of 1067 mAh g<sup>-1</sup>). Moreover, the Li<sub>2</sub>S@C also possesses outstanding rate capability and cycling stability. High reversible capacity of 644 mAh g<sup>-1</sup> is delivered at 2 mA cm<sup>-2</sup> even after 700 cycles. This work demonstrates that ASSLSBs with superior electrochemical performance can be realized via rational design of the cathode structure, which provides a promising prospect to the development of ASSLSBs with practical energy density surpassing that of lithium ion batteries.