提高钙钛矿结构锂离子导体晶界电导率的研究进展（英文）

A Review on Attempts to Improve Grain-Boundary Conductivity in Perovskite Lithium Ion Conductors

多晶材料的锂离子传导是由晶界和晶粒共同决定的,而晶界部分固有的大电阻造成了总电导率较低。综述了提高晶界电导率的研究进展,包括结构改性,A位和B位的掺杂,添加绝缘的第二相以及掺杂锂离子传导材料。通过对已有研究成果的综述发现：锂离子的浓度,锂离子的移动性和A位空位比晶界的数量对总电导率的影响更大,掺杂其他元素到A位和B位也有一定的效果;添加绝缘的第二相的效果受到其他因素如制备方法的影响而呈现较大的差异性;添加像Li7La3Zr2O（12）,Li2O-B2O3和Li3PO4锂离子传导材料可以提高总电导率。最后对今后的发展方向作出了展望。

Lithium conductivity in polycrystalline materials is determined by the grains and grain boundaries. An intrinsically large grain-boundary resistance results in a low total conductivity. This review represents recent work on the improvement of grain-boundary conductivity in terms of structural modification, doping A and B sites, incorporating inactive second phases and lithium-ion conducting materials. The concentration of Li ions and the mobility of Li＋ and A-site vacancies have dominant effects on the conductivity, compared to the grain boundary volume. Doping A and B sites with other elements are also effective. The effectiveness of incorporating an inactive second phase is compromised by some factors like the preparation methods. Lithium conducting materials, such as Li7La3Zr2O（12）,Li2O-B2O3 and Li3PO4, can improve the total conductivity. In addition, the prospects and future direction for improving grain-boundary conductivity were also discussed.