Fast Lithium Ion Conduction in Arsenides Li9AlAs4 and Li9GaAs4
收藏中国科学院兰州化学物理研究所科学数据中心2026-01-08 更新2026-01-10 收录
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Understanding the structure−property relationship in ionic conductors is crucial for developing more efficient solidstate electrolytes and improving cell architecture. Here, we present two new arsenide-based fast ion conductors, Li9AlAs4 and Li9GaAs4, and compare them with two previously reported phosphide-based superionic conductors, Li9AlP4 and Li9GaP4, to study the substitution effect of element P by As. It is established that anion substitution dramatically enhances lithium-ion mobility and conductivity. In particular, the ionic conductivity and diffusion
coefficient at room temperature of Li9GaAs4 reached remarkable levels of 6.5 mS cm−1 and 2.05 × 10−11 m2 s−1, respectively, achieving an order of magnitude increase compared with Li9GaP4. Multinuclear solid-state NMR chemical shifts reveal that As3− in [TrAs4]9− (Tr = Al, Ga) has a lower negative charge density than P3− in [TrP4]9−, which leads to a smaller Coulomb force between Li+ and As3− than between Li+ and P3−. This weakened Coulomb force on lithium ions, caused by As substitution, together with an enlarged lattice volume, lowers the activation barrier and promotes Li ion conductivity
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中国科学院兰州化学物理研究所科学数据中心
创建时间：
2026-01-08
