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arXiv 2101.09780cond-mat.mtrl-sci
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固体电解质AlxLi7-3xLa3Zr2O12晶体缺陷的X射线纳米成像

X-ray nanoimaging of crystal defects in single grains of solid-state electrolyte AlxLi7-3xLa3Zr2O12

Yifei Sun, Oleg Yu. Gorobstov, Linqin Mu, Daniel Weinstock, Ryan Bouck, Wonsuk Cha, Nikolaos Bouklas, Feng Lin, Andrej Singer1

摘要:

与传统的液体电解质电池相比,全固态锂电池有望在能量密度和安全性方面取得显著改善。Al掺杂的AlxLi 7 - 3xLa 3 Zr 2 O 12(LLZO)固态电解质由于其高离子电导率和良好的热、化学和电化学稳定性而显示出优异的潜力。然而,LLZO的电化学和机械性能的进一步改善需要对其局部微观结构的深刻理解。在这里,我们采用布拉格相干衍射成像调查的原子位移内的单个晶粒的LLZO与各种Al掺杂浓度,导致立方,四,和四-四混合结构。我们观察到共存的领域中的不同的晶体取向的tetraxide结构。我们进一步表明,Al掺杂导致晶体缺陷,如位错和相边界的混合相和双相晶粒。该研究解决了Al掺杂对LLZO单个晶粒内的纳米结构的影响,这对于固态电池的未来发展具有参考价值。

英文摘要:

All-solid-state lithium batteries promise significant improvements in energy density and safety over traditional liquid electrolyte batteries. The Al-doped AlxLi7-3xLa3Zr2O12 (LLZO) solid-state electrolyte shows excellent potential given its high ionic conductivity and good thermal, chemical, and electrochemical stability. Nevertheless, further improvements on LLZOs electrochemical and mechanical properties call for an incisive understanding of its local microstructure. Here, we employ Bragg Coherent Diffractive Imaging to investigate the atomic displacements inside single grains of LLZO with various Al-doping concentrations, resulting in cubic, tetragonal, and cubic-tetragonal mixed structures. We observe coexisting domains of different crystallographic orientations in the tetragonal structure. We further show that Al doping leads to crystal defects such as dislocations and phase boundary in the mixed- and cubic-phase grain. This study addresses the effect of Al-doping on the nanoscale structure within individual grains of LLZO, which is informative for the future development of solid-state batteries.

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