Journal of Energy Chemistry ›› 2023, Vol. 86 ›› Issue (11): 382-390.DOI: 10.1016/j.jechem.2023.07.038

Previous Articles     Next Articles

Dual-doping for enhancing chemical stability of functional anionic units in sulfide for high-performance all-solid-state lithium batteries

Peiwen Yua, Niaz Ahmada,c, Jie Yanga, Chaoyuan Zengc, Xiaoxiao Liangc, Weiming Huange,f,g, Mei Nid, Pengcheng Maob,*, Wen Yanga,*   

  1. aKey Laboratory of Cluster Science of Ministry of Education, Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China;
    bAnalysis & Testing Center, Beijing Institute of Technology, Beijing 100081, China;
    cKey Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources, Hainan Provincial Key Lab of Fine Chemistry, School of Chemical Engineering and Technology, Hainan University, Haikou 570228, Hainan, China;
    dDepartment of Basic Courses, China Fire and Rescue Institute, Beijing 102202, China;
    eCollege of Chemistry, Jilin University, Changchun 130012, Jilin, China;
    fKey Laboratory of Physics and Technology for Advanced Batteries of Ministry of Education, Jilin University, Changchun 130012, Jilin, China;
    gSouthern Marine Science and Engineering Guangdong Lab (Zhanjiang), Zhanjiang 524002, Guangdong, China
  • Received:2023-06-14 Revised:2023-07-21 Accepted:2023-07-30 Online:2023-11-15 Published:2023-11-07
  • Contact: *E-mail addresses: pcmao@bit.edu.cn (P. Mao), wenyang@bit.edu.cn (W. Yang).

Abstract: The sulfide-based solid-state electrolytes (SEs) reactivity toward moisture and Li-metal are huge barriers that impede their large-scale manufacturing and applications in all-solid-state lithium batteries (ASSLBs). Herein, we proposed an Al and O dual-doped strategy for Li3PS4 SE to regulate the chemical/electrochemical stability of anionic PS43- tetrahedra to mitigate structural hydrolysis and parasitic reactions at the SE/Li interface. The optimized Li3.08Al0.04P0.96S3.92O0.08 SE presents the highest σLi+ of 3.27 mS cm-1, which is ∼6.8 times higher than the pristine Li3PS4 and excellently inhibits the structural hydrolysis for ∼25 min @25% humidity at RT. DFT calculations confirmed that the enhanced chemical stability was revealed to the intrinsically stable entities, e.g., POS33- units. Moreover, Li3.08Al0.04P0.96S3.92O0.08 SE cycled stably in Li//Li symmetric cell over 1000 h @0.1 mA cm-2/0.1 mA h cm-2, could be revealed to Li-Al alloy and Li2O at SE/Li interface impeding the growth of Li-dendrites during cycling. Resultantly, LNO@LCO/Li3.08Al0.04P0.96S3.92O0.08/Li-In cell delivered initial discharge capacities of 129.8 mA h g-1 and 83.74% capacity retention over 300 cycles @0.2 C at RT. Moreover, the Li3.08Al0.04P0.96S3.92O0.08 SE presented >90% capacity retention over 200 and 300 cycles when the cell was tested with LiNi0.8Co0.15Al0.05O2 (NCA) cathode material vs. 5 and 10 mg cm-2 @RT.

Key words: Dual doping, High Li+ conductivity, Air-stability, POS33- functional units, Stable SE/electrode interface