溶剂热法合成三维花瓣状石榴石型固态电解质及其在固态聚合物电解质中的应用  

Solvothermal synthesis of three-dimensional petaloid garnet electrolyte and its application in solid polymer electrolytes

作　　者：翟艳芳 杨冠明 侯望墅 姚建尧[1] 温兆银[2] 宋树丰 胡宁 ZHAI Yanfang;YANG Guanming;HOU Wangshu;YAO Jianyao;WEN Zhaoyin;SONG Shufeng;HU Ning(College of Aerospace Engineering,Chongqing University,Chongqing 400044,China;CAS Key Laboratory of Materials for Energy Conversion,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;State Key Laboratory of Reliability and Intelligence Electrical Equipment,Hebei University of Technology,National Engineering Research Center for Technological Innovation Method and Tool,School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]重庆大学航空航天学院,重庆400044 [2]中国科学院上海硅酸盐研究所能量转换材料重点实验室,上海200050 [3]河北工业大学,省部共建电工装备可靠性与智能化国家重点实验室,国家技术创新方法与实施工具工程技术研究中心,机械工程学院,天津300401

出　　处：《储能科学与技术》2021年第3期905-913,共9页Energy Storage Science and Technology

基　　金：国家科技重大专项(2017-VII-0011-0106);国家科技部国际科技合作重点项目(2016YFE0125900);国家自然科学基金(11632004);国家自然科学基金(U1864208);天津科技计划项目(20ZYJDJC00030);河北省重点研发项目(202030507040009);河北省自然科学基金创新研究群体项目(A2020202002);天津市自然科学基金重点项目(S20ZDF077)。

摘　　要：石榴石型固态电解质由于具有离子电导率高、对金属锂稳定、成本低等一系列优点而被认为是最具应用前景的固态电解质材料体系之一,针对石榴石型电解质及其复合电解质的研究快速发展,然而,石榴石型电解质的合成方法研究较少,特别是具有特征微观形态的石榴石型电解质的研究鲜有报道。本工作首次报道了溶剂热法合成三维花瓣状石榴石型固态电解质(Li_(6.25)Al_(0.25)La_(3)Zr_(2)O_(12),LLZO),该合成方法主要涵盖两个步骤:第一步是镧-铝-锆甘油酸球的合成,第二步即是立方石榴石的成相。继而对比研究了三维花瓣状与纳米颗粒石榴石型电解质在聚氧化乙烯(PEO)固态聚合物电解质中的应用差异,结果表明,添加质量分数为10%的纳米颗粒LLZO的复合固态电解质的室温(25℃)离子电导率为1.45×10^(-5 )S/cm,与之对比,同样添加量的三维花瓣状LLZO的复合固态电解质的25℃离子电导率高达5.59×10^(-5) S/cm,说明了该新奇的三维花瓣状石榴石型电解质的优越性,为其在固态锂电池中的应用打下基础。Under the considerations of superior ionic conductivities,excellent stable interphase with lithium metal anode,and low cost,lithium-stuffed garnets have been recognized as one of the most promising solid-state lithium electrolytes.Research on garnets and their composite electrolytes inspired the battery community over the past 10 years.However,the exploration of the unique morphologies of garnet-type electrolytes derived from new synthesis methods has received hardly any attention thus far,although the morphologies of garnet electrolytes are important for their applications in solid polymer electrolytes.Herein,we report a solvothermal method to synthesize a unique nanostructured garnet-type electrolyte,viz.cubic three-dimensional petaloid garnet electrolytes.Uniform aluminum-lanthanum-zirconium glycerate solid spheres are first synthesized as precursors and subsequently chemically transformed into three-dimensional petaloid garnet electrolytes.A composite solid polymer electrolyte containing 10%three-dimensional petaloid garnet exhibits a practically useful conductivity of 5.59×10^(−5) S·cm^(−1) at 25℃.For comparison,a composite solid polymer electrolyte containing 10%garnet nanoparticle shows a conductivity of 1.45×10^(−5) S·cm^(−1).This finding provides a strategy to explore superionic conductors.

关 键 词：固态电池 三维花瓣状石榴石 溶剂热法 固态聚合物电解质 电导率 

分 类 号：TQ02[化学工程]