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石榴石型Li_7La_3Zr_2O12(LLZO)具有高的离子电导率、宽的电化学窗口及良好的稳定性，是一种极具应用潜力的全固态锂离子电池电解质材料。本工作先通过固相法合成了Li7-3xGa_xLa_3Zr_2O12(x=0、0.15、0.20、0.25)粉体，再经干压成型和高温烧结制备了固态电解质材料，主要探讨了Ga掺杂量对LLZO电解质的晶相组成、微观形貌、离子电导率及电化学窗口的影响。结果表明，未添加Ga时，在950℃保温6 h煅烧得到的LLZO为四方相结构，而Ga的引入可使LLZO在室温下获得稳定的立方结构。随着Ga掺杂量的增加，LLZO电解质的烧结密度和离子电导率呈现先升高后降低的变化趋势。其中Ga掺杂量x=0.20时，电解质具有最致密的微观结构，其离子电导率达到1.12×10-3 S·cm-1，且电化学窗口宽度显著增大。
Abstract：Garnet-type Li7 La3 Zr_2O12(LLZO) exhibits high ionic conductivity, a broad electrochemical window, and excellent stability, making it a promising candidate for all-solid-state lithium-ion battery electrolytes. In this study, Li7-3 xGa_xLa3 Zr_2O12(x=0, 0.15, 0.20, 0.25) powders were synthesized via a solid-state reaction method, followed by dry pressing and high-temperature sintering to prepare solid electrolyte materials. The effects of Ga doping levels on the crystal phase composition, microstructure, ionic conductivity, and electrochemical window of LLZO electrolytes were systematically investigated. Results showed that without Ga doping, LLZO calcined at 950 ℃ for 6 h had a tetragonal structure, while the incorporation of Ga enabled LLZO to stabilize in a cubic structure at room temperature. With increasing Ga doping content, the sintering density and ionic conductivity of the LLZO electrolytes initially increased and then decreased. Notably, the sample with a Ga content of x=0.20 exhibited the densest microstructure, achieving an ionic conductivity of 1.12×10-3 S·cm-1 and a significantly widened electrochemical window.
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基本信息:
DOI：10.16521/j.cnki.issn.1001-9642.2026.01.003
中图分类号:TQ131.11;TM912
引用信息:
[1]李小慧,张小珍,刘蔚,等.Ga掺杂量对LLZO电解质结构与离子电导性能的影响[J].中国陶瓷,2026,62(01):17-23.DOI:10.16521/j.cnki.issn.1001-9642.2026.01.003.
基金信息:
江西省教育厅科学技术研究项目（GJJ211303）; 景德镇陶瓷大学研究生创新项目（JYC202323）