All-in-one improvement toward Li6PS5Br-Based solid electrolytes triggered by compositional tune

作者：Zhang, Zhixia; Zhang, Long^*; Yan, Xinlin; Wang, Hongqiang; Liu, Yanyan; Yu, Chuang; Cao, Xiaoting; van Eijck, Lambert; Wen, Bin

来源：Journal of Power Sources, 2019, 410: 162-170.

DOI：10.1016/j.jpowsour.2018.11.016

• Li dendrite suppression
• Interfacial stability
• Argyrodites
• Solid electrolytes
• All-solid-state batteries

Sulfide solid electrolytes possess high ionic conductivity and moderate dendrite suppression capability, but rather poor compatibility against oxide cathodes and metallic Li. Here, we report O-doped Li6PS5Br as solid electrolyte synthesized by a facile solid-state sintering. Different from other O-incorporated sulfides, the O atoms in Li6PS5-xOxBr prefer to substitute the S atoms at free S2- sites rather than those at the PS4 tetrahedra. Remarkably, without deteriorating the ionic conductivity, this inorganic solid electrolyte with O doping exhibits comprehensively enhanced properties including excellent dendrite suppression capability, superior electro-chemical and chemical stability against Li metal as well as high voltage oxide cathodes, and good air stability. Li (Ni(0,8)Co(0.1)Mno(0.1))O-2 and LiCoO2-based all-solid-state batteries with Li6PS4.7O0.3Br electrolyte deliver high specificcapacity, superior rate capability, and outstanding cycling stability accompanied with low interfacial resistivity. This type of inorganic solid electrolytes is promising for all-solid-state batteries with high energy density.

• 出版日期2019-1-15
• 单位燕山大学; 河北大学; 亚稳材料制备技术与科学国家重点实验室