Conductivity Optimization of Tysonite-type La1-xBaxF3-x Solid Electrolytes for Advanced Fluoride Ion Battery

被引:77
作者
Bhatia, Harshita [1 ,2 ]
Duc Tho Thieu [1 ,2 ,5 ]
Pohl, Alexander Herald [2 ]
Chakravadhanula, Venkata Sai K. [1 ,3 ,4 ]
Fawey, Mohammed H. [2 ,4 ]
Kuebel, Christian [1 ,2 ,3 ]
Fichtner, Maximilian [1 ,2 ]
机构
[1] Helmholtz Inst Ulm Electrochem Energy Storage HIU, Helmholtzstr 11, D-89081 Ulm, Germany
[2] Karlsruhe Inst Technol, Inst Nanotechnol, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
[3] Karlsruhe Inst Technol, KNMF, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
[4] Tech Univ Darmstadt, Joint Res Lab Nanomat KIT & TUD, D-64287 Darmstadt, Germany
[5] CIDETEC, Mat Energy Unit, Donostia San Sebastian 20014, Gipuzkoa, Spain
关键词
energy storage; fluoride ion conductor; solid electroyte; impedance spectroscopy; fluoride ion battery; CERAMICS; SR; BA; CA; LA;
D O I
10.1021/acsami.7b04936
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Use of lithium ion batteries is currently the method of choice when it comes to local stationary storage of electrical energy. In the search for an alternative system; fluoride ion batteries (FIBs) emerge as a candidate due to their high theoretical capacity, and no lithium is needed for its operation. To improve the cycling performance and lower the working temperature of a solid-state battery, one of the critical components is the electrolyte, which needs advanced performance. This paper aims at developing an electrolyte with enhanced ionic conductivity for fluoride ions, to be used in a FIB. Tysonite La1-xBaxF3-x, (0 <= x <= 0.15) solid solutions were synthesized by a facile wet chemical method, and its ionic conductivity was analyzed using electrochemical impedance spectroscopy. A composition study shows that the conductivity reaches a maximum of 1.26 X 10(-4) S.cm(-1) at 60 degrees C for the La0.95Ba0.05F2.95 pellet sintered at 800 degrees C for 20 h, Which is 1 order of magnitude higher than that for the as prepared pellet and 2 times higher than the conductivity of sintered ball-milled batches. The reason for this dramatic increment is the more efficient decrement of grain boundary resistance upon sintering. Morphological, chemical, and structural characterizations of solid electrolytes were studied by X-ray diffraction, scanning electron microscopy, energy dispersive Xray spectroscopy, physisorption by the Brunauer-Emmett-Teller method, and transmission electron microscopy. Electrochemical testing was carried out for the FIB cell using La0.95Ba0.05F2.95 as electrolyte due to its highest conductivity among the compositions, Ce as anode, and BiF3 as a cathode. The cycling performance was found to be considerably improved when compared to our earlier work, which used the ball-milled electrolyte.
引用
收藏
页码:23707 / 23715
页数:9
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