Room-temperature ionic conductivity of Ba, Y, Al co-doped Li 7 La 3 Zr 2 O 12 solid electrolyte after sintering
- PDF / 869,520 Bytes
- 6 Pages / 595.276 x 790.866 pts Page_size
- 31 Downloads / 159 Views
RARE METALS
ORIGINAL ARTICLE
Room-temperature ionic conductivity of Ba, Y, Al co-doped Li7La3Zr2O12 solid electrolyte after sintering Xiao-Zhen Liu*, Lei Ding, Yu-Ze Liu, Li-Ping Xiong, Jie Chen, Xiao-Long Luo
Received: 13 May 2018 / Revised: 24 June 2018 / Accepted: 6 July 2020 Ó The Nonferrous Metals Society of China and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The Ba, Y and Al co-doped Li7La3Zr2O12 (LLZO) was prepared by the solid-state reaction method. Effect of sintering on the crystallographic structure, morphology, total conductivity, relative density and contractibility rate of the prepared solid electrolyte was studied, respectively. The sintered samples were characterized by X-ray diffractometer (XRD), scanning electron microscopy (SEM), electrochemical impedance spectra (EIS) and inductively coupled plasma atomic emission spectrometry (ICP-AES) techniques, respectively. The cubic garnet phase Ba, Y and Al co-doped LLZO is obtained, and the room-temperature total conductivity of the Ba, Y and Al co-doped LLZO solid electrolyte is improved significantly by eliminating the grain boundary resistances and improving the densifications with controlling sintering temperature (T) and time (t), respectively. Sintering at 1160–1190 °C for 12 h and at 1190 °C for 6–15 h, respectively, the Ba, Y and Al co-doped LLZO solid electrolytes are cubic garnet phase. Sintering at 1180–1190 °C for 12 h and at 1190 °C for 12–18 h, respectively, SEM images of the cross section of the Ba, Y and Al co-doped LLZO solid electrolytes exhibit the distinctively flattened morphology without any noticeable grain boundaries. The total conductivity, relative density
X.-Z. Liu*, L. Ding, L.-P. Xiong, X.-L. Luo School of Chemical and Environmental Engineering, Shanghai Institute of Technology, Shanghai 201418, China e-mail: [email protected] Y.-Z. Liu College of Economic and Management, Beijing Forestry University, Beijing 100083, China J. Chen Regenia AB, Stockholm 10691, Sweden
and contractibility rate of Li6.52La2.98Ba0.02Zr1.9Y0.1Al0.2O12 solid electrolyte are 2.96 9 10-4 Scm-1, 94.19% and 18.61%, respectively. Keywords Solid electrolyte; Ionic conductivity; Sintering; Li7La3Zr2O12; Garnet
1 Introduction The organic Li-ion salt electrolytes are widely used in lithium-ion batteries at present, but their flammability may cause serious safety issues [1–7], and the stability problem of the aqueous electrolytes with lithium metal has seriously limited the voltage range [2]. Therefore, inorganic solidstate electrolytes are now attracting much attention. Garnet-type Li7La3Zr2O12 (LLZO) as the inorganic solid electrolyte has excellent thermal performance, high chemical compatibility against molten lithium, high conductivity, wide electrochemical window and has been given much attention [8–15]. LLZO has cubic and tetragonal crystalline phases. The lithium-ion conductivity of cubic phase LLZO is about 2 or 3 orders of magnitude higher than that of tetragonal phase LLZO [16]. Hence, formation and stabilizati
Data Loading...
