Designing lithium halide solid electrolytes
Qidi Wang (TU Delft - Applied Sciences)
Yunan Zhou (Tsinghua University)
Xuelong Wang (Brookhaven National Laboratory)
Hao Guo (China Institute of Atomic Energy)
Shuiping Gong (Shanghai Jiao Tong University)
Zhenpeng Yao (Shanghai Jiao Tong University)
Swapna Ganapathy (TU Delft - RID/TS/Instrumenten groep, TU Delft - Applied Sciences)
Chenglong Zhao (TU Delft - Applied Sciences)
Marnix Wagemaker (TU Delft - Applied Sciences)
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Abstract
All-solid-state lithium batteries have attracted widespread attention for next-generation energy storage, potentially providing enhanced safety and cycling stability. The performance of such batteries relies on solid electrolyte materials; hence many structures/phases are being investigated with increasing compositional complexity. Among the various solid electrolytes, lithium halides show promising ionic conductivity and cathode compatibility, however, there are no effective guidelines when moving toward complex compositions that go beyond ab-initio modeling. Here, we show that ionic potential, the ratio of charge number and ion radius, can effectively capture the key interactions within halide materials, making it possible to guide the design of the representative crystal structures. This is demonstrated by the preparation of a family of complex layered halides that combine an enhanced conductivity with a favorable isometric morphology, induced by the high configurational entropy. This work provides insights into the characteristics of complex halide phases and presents a methodology for designing solid materials.
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