我室杨勇教授在 Nano Letters 上发表论文：In Situ Generated Li2S–C Nanocomposite for High-Capacity and Long-Life All-Solid-State Lithium Sulfur Batteries with Ultrahigh Areal Mass Loading

文章链接：https://pubs.acs.org.ccindex.cn/doi/10.1021/acs.nanolett.9b00882

摘要：

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 Li₂S, and the large volume change during cycling. Herein, a Li₂S@C nanocomposite with Li₂S nanocrystals uniformly embedded in conductive carbon matrix, is in situ generated by the combustion of lithium metal with CS₂. Benefiting from its unique architecture, the Li₂S@C exhibits exceptional electrochemical performance as cathode for ASSLSBs, with both ultrahigh areal Li₂S loading (7 mg cm^–2) and 91% of Li₂S utilization (corresponding to a reversible capacity of 1067 mAh g^–1). Moreover, the Li₂S@C also possesses outstanding rate capability and cycling stability. High reversible capacity of 644 mAh g^–1 is delivered at 2 mA cm^–2 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.