Beijing Advanced Innovation Center for Materials Genome Engineering, Institute of Advanced Materials and Technology , University of Science and Technology Beijing , Beijing 100083 , China.
School of Aerospace Engineering , Tsinghua University , Beijing 100084 , China.
ACS Appl Mater Interfaces. 2019 Oct 9;11(40):36774-36781. doi: 10.1021/acsami.9b12846. Epub 2019 Sep 25.
All-solid-state lithium-sulfur batteries (ASSLSBs) employing sulfide-based solid electrolytes have gained widespread attention for their high energy density and intrinsic safety. LiSnPS is identified as one of the most rivaling candidates in sulfide electrolytes. Herein, a highly Li-ion-conductive LiSnPS solid-state electrolyte (SSE) is synthesized via a combination of high-energy ball-milling and heat treatment processes, which is more facile and efficient compared with other previously reported methods. The obtained LiSnPS SSE exhibits high ionic conductivity (3.2 × 10 S cm) at room temperature (RT). The effects of the annealing temperature on the Li-ion conductivity and activation energy of LiSnPS are also thoroughly studied. Moreover, the ASSLSBs based on the LiSnPS electrolyte are constructed, and they deliver a high initial capacity of 1601.7 mAh g at 40 mA g. A favorable capacity retention upon cycling and a good rate performance are also achieved at RT. Concomitantly, the Coulombic efficiency approaches 100% during the prolonged cycling. This work tremendously accelerates the practical applications of the LiSnPS SSE among the emerging high-energy ASSLSBs.
全固态锂硫电池（ASSLSBs）采用基于硫化物的固体电解质，因其高能量密度和固有安全性而受到广泛关注。LiSnPS 被认为是硫化物电解质中最具竞争力的候选材料之一。在此，通过高能球磨和热处理相结合的方法合成了一种高锂离子电导率的 LiSnPS 固态电解质（SSE），与其他先前报道的方法相比，这种方法更加简单高效。所得到的 LiSnPS SSE 在室温下具有高离子电导率（3.2×10-3 S cm-1）。还深入研究了退火温度对 LiSnPS 锂离子电导率和活化能的影响。此外，构建了基于 LiSnPS 电解质的 ASSLSBs，其在 40 mA g-1 的电流密度下具有 1601.7 mAh g-1 的初始高容量。在室温下还实现了良好的循环容量保持率和良好的倍率性能。同时，在长时间循环过程中库仑效率接近 100%。这项工作极大地加速了 LiSnPS SSE 在新兴高能量 ASSLSBs 中的实际应用。
