Enhanced ionic conductivity in a novel composite electrolyte based on Gd-doped SnO_(2) nanotubes for ultra-long-life all-solid-state lithium metal batteries

查看全文 作　　者：Lugang [1]Zhang;Nanping [1]Deng;Junbao [1]Kang;Xiaoxiao [1]Wang;Hongjing [1]Gao;Yarong [1]Liu;Hao [1]Wang;Gang [1]Wang;Bowen [1,2]Cheng;Weimin [1]Kang 机构地区：[1]State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes,School of Textile Science and Engineering,Tiangong University,Tianjin 300387,China;[2]School of Material Science and Engineering,Tiangong University,Tianjin 300387,China 出　　处：《Journal of Energy Chemistry》索引2023年第2期,共13页 基　　金：supported by the National Natural Science Foundation of China(52203066,51973157,61904123,51873152);the Tianjin Natural Science Foundation(18JCQNJC02900);the Science and Technology Plans of Tianjin(19PTSYJC00010);the Tianjin Research Innovation Project for Postgraduate Students(2021YJSB234);the Science&Technology Development Fund of Tianjin Education Commission for Higher Education(2018KJ196);State Key Laboratory of Membrane and Membrane Separation,Tiangong University。 摘　　要：All-solid-state electrolytes are exceedingly attractive because of the outstanding inherent safety and energy density compared to liquid electrolytes.Whereas,it is still formidable to simultaneously design solid electrolytes with favorable electrode/electrolyte interface compatibility and high ionic conductivity in a simple and scalable manner.Hence,the oxygen-vacancy-rich Gd-doped SnO_(2) nanotubes(GDS NTs)are innovatively prepared and applied to the electrolyte of all-solid-state lithium metal batteries for the first time.The addition of GDS NTs can validly construct long-range co ntinuous ion transport networks in the poly(ethylene oxide)(PEO)-based system and greatly improve the mechanical properties of the electrolyte.Compared to the PEO-based electrolyte,the composite electrolyte displays a higher lithium ion conductivity of 2.41×10^(-4) S cm^(-1) at 30℃,a higher lithium ion transference number up to 0.62 and a wider electrochemical window of 5 V at 50℃.In addition,the composite electrolyte manifests outstanding compatibility with high-voltage LiNi_(0.8)Mn_(0.1)Co_(0.1)O_(2)(NMC811)cathode,LiFePO4 cathode and lithium metal anode.The assembled Li/Li symmetric battery exhibits stable Li plating/stripping cycling performance,which can cycle steadily for 1500 h at a capacity of 0.3 mA h cm^(-2).And Li/LiFePO4 battery still maintains a high capacity of 131.54 mA h g^(-1) at 0.5C after 800 cycles,which has a superior capacity retention rate of 93.2%.The obtained novel composite electrolyte has promising application prospects in the field of all-solid-state lithium metal cells. 关 键 词：All-solid-state lithium metal batteries Gd-doped SnO2 nanotubes Interfacial stability Oxygen vacancies Solid-state composite electrolytes