Preparation and Electrochemical Properties of Li1+xAlxGe2-x(PO4)3Synthesized by a Sol-Gel Method

Zhang, Ming; Takahashi, Keita; Imanishi, N.; Takeda, Yasuo; Yamamoto, Osamu; Chi, Bo; Pu, Jian; Li, Jian

doi:10.1149/2.080207jes

Cited by 86 publications

(52 citation statements)

References 30 publications

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“…When the LTP‐based oxides contact with low‐potential anodes like Li metal or C 6 Li, the reduction of Ti 4+ ions introduces electronic conduction, resulting in short circuit of the batteries. A similar unstability under reduction potential has also been observed for LAGP with a lower threshold value of 0.648–0.85 V versus Li + /Li . LiHf 2 (PO 4 ) 3 is considered stable against Li metal, but the requirement for high‐temperature (above 1100°C) annealing to transform into a high ionic conducting phase could be an obstacle for the practical application …”

Section: Nasicon‐type Electrolytessupporting

confidence: 61%

“…Wet‐chemical approach and glass‐ceramic processing have been proved to be more effective than the conventional solid state reaction and sintering, enabling further improvement of the total ionic conductivity of NASICON‐type materials. For example, Zhang et al synthesized an impurity phase‐free Li 1+ x Al x Ge 2− x (PO 4 ) 3 (LAGP) using sol–gel method, and a total conductivity of 1.22 × 10 −3 S/cm was then achieved for Li 1.4 Al 0.4 Ge 1.6 (PO 4 ) 3 . Yi et al also reported a high total conductivity of 2–3 × 10 −3 S/cm for Li 1.7 Al 0.3 Ti 1.7 Si 0.4 P 2.6 O 12 by using liquid‐feed flame spray pyrolysis and excess Li 2 O as sintering aid.…”

Section: Nasicon‐type Electrolytesmentioning

confidence: 99%

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Oxide Electrolytes for Lithium Batteries

et al. 2015

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As the most promising candidate of the solid electrolyte materials for future lithium batteries, oxide electrolytes with highlithium-ion conductivity have experienced a rapid development in the past few decades. Existing oxide electrolytes are divided into two groups, i.e., crystalline group including NASICON, perovskite, garnet, and some newly developing structures, and amorphous/glass group including Li 2 O-MO x (M = Si, B, P, etc.) and LiPON-related materials. After a historical perspective on the general development of oxide electrolytes, we try to give a comprehensive review on the oxide electrolytes with high-lithium-ion conductivity, with special emphasis on the aspect of materials selection and design for applications as solid electrolytes in lithium batteries. Some successful examples and meaningful attempts on the incorporation of oxide electrolytes in lithium batteries are also presented. In the conclusion part, an outlook for the future direction of oxide electrolytes development is given.

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Section: Nasicon‐type Electrolytessupporting

confidence: 61%

Section: Nasicon‐type Electrolytesmentioning

confidence: 99%

Oxide Electrolytes for Lithium Batteries

et al. 2015

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“…Therefore, we focused on the composition of 0.5 mol % Ta per unit formula of garnet-type oxide having the cubic structure. As is well known, Li 7 …”

Section: Introductionmentioning

confidence: 88%

Li-ion conductivity and crystal structure of garnet-type Li6.5La3M1.5Ta0.5O12 (M = Hf, Sn) oxides

Hamao

Kataoka

Akimoto

2017

J. Ceram. Soc. Japan

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We investigated the Li-ion conductivity and crystal structure of the Ta-doped Li 7 La 3 M 2 O 12 (M = Hf, Sn) samples. All of the Tadoped samples exhibited a relatively high conductivity of ³10 ¹4 S cm ¹1 at room temperature, and the activation energies of Li 6.5 La 3 Hf 1.5 Ta 0.5 O 12 and Li 6.5 La 3 Sn 1.5 Ta 0.5 O 12 , which were determined from the Arrhenius plots in measured temperature range, are Ea = 0.400(6) and 0.451(1) eV, respectively. The crystal structure was analyzed by Rietveld method using powder X-ray diffraction data. From a view point of the LiO polyhedral volume in unit cell, Li 6.5 La 3 Hf 1.5 Ta 0.5 O 12 has a most suitable Li-ion environment among the Li 7 La 3 M 2 O 12 (M = Zr, Hf, Sn) compounds.

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“…Inda et al demonstrated aL i 4 Ti 5 O 12 /LATP/LCOb attery structure with ah igh capacityo f1 50 mA hg À1 . [102] The authors mentioned that the interface resistance between LAGP and Li metal increased with storage time, whereas the resistancew as constant if LAGP made contact with Li 7 Ti 5 O 12. [102] The authors mentioned that the interface resistance between LAGP and Li metal increased with storage time, whereas the resistancew as constant if LAGP made contact with Li 7 Ti 5 O 12.…”

Section: Electrochemical Applications Inmentioning

confidence: 99%

Synthesis and Properties of NaSICON‐type LATP and LAGP Solid Electrolytes

2019

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Inorganic solid electrolytes, in comparison with their liquid counterparts, have more potential in varioust ypes of batteries due to their dual roles of ion transportation and separation. For all-solid-state batteries, solide lectrolytes bring several advantages, [1][2][3][4][5][6] such as enhanced safety,i ncreased energy density,s olid device integration, and packaging;t hese expand the operation temperature range and potentially improve cycling stabilitya nd lifetime. Moreover,i norganic solid electrolytes are also beneficial for lithium-ion batteries and lithium-air batteries, in which they functiona se ither surface modification layers or lithium-ion conductors. [7,8] In principle, ideal solid electrolytes are expected to have several features: [9][10][11][12][13][14] 1) fast ion dynamics and negligible electronic conductivity (minimum ionic conductivity of 10 À4 Scm À1 at room temperature for practical consideration);2 )a wide electrochemical potential window for battery cycling;3 )ane xceptional mechanical strength to suppress lithium dendrite growth;4 )excellent thermal stability during the cycling processes;and 5) asimple and low cost synthetic process for large-scale applications.Generally,i norganic lithium superionic conductors are divided into three categories:o xides, sulfides, and phosphates. Suc-cessfule xamples in oxidesi nclude garnet oxides, [15,16] perovskite-type oxides, [17,18] and antiperovskite oxides. [19][20][21] Sulfide solid electrolytes include Li 2 SÀP 2 S 5 , [22,23] Li 3 PS 4 , [24][25][26] Li 7 P 3 S 11 , [27,28] Li 7 PS 6 ,a nd Li 6 PS 5 X( X = Cl, Br). [29][30][31] Popular phosphate solid electrolytes include sodium superionic conductor (NaSICON)structured lithium-ion conductors, [32][33][34][35][36] such as LiTi 2 (PO 4 ) 3 (LTP), Li 1 + x Al x Ti 2Àx (PO 4 ) 3 (LATP), and Li 1 + x Al x Ge 2Àx (PO 4 ) 3 (LAGP). Many exciting discoveries of these materials have been summarized in important review papers. [2,6,[37][38][39][40] NaSICON-type solid electrolytes, such as LATP and LAGP, have marked advantages compared with sulfides and oxides: they display chemicals tabilityi na ir and/or water,a re low cost and low toxicity,a nd have great electrochemical stability with the added benefito fe asy preparation. [2,36,38] They also exhibit attractive ionic conductivities of 10 À4 -10 À3 Scm À1 at room temperature. Such features have recently caused renewed interest in these NaSICON-structured materials and much effort has been devoted to the investigation of this type of solid electrolyte, especiallyL ATPa nd LAGP.T his manuscript reviewsr ecent progress in LATP and LAGP solid electrolytes, with as pecific focus on synthetic approaches and their effects on the crystal structures, conductive properties, and applications. Herein, general synthetic methods for LATP and LAGP solid electrolytes are first introduced, followed by ac omparison of the crystal structures, phase purities, and ionic conductivities that result from different approaches. Later,t he applications of LATP and LAGP in ful...

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Preparation and Electrochemical Properties of Li_1+xAl_xGe_2-x(PO₄)₃Synthesized by a Sol-Gel Method

Cited by 86 publications

References 30 publications

Oxide Electrolytes for Lithium Batteries

Oxide Electrolytes for Lithium Batteries

Li-ion conductivity and crystal structure of garnet-type Li<sub>6.5</sub>La<sub>3</sub><i>M</i><sub>1.5</sub>Ta<sub>0.5</sub>O<sub>12</sub> (<i>M</i> = Hf, Sn) oxides

Synthesis and Properties of NaSICON‐type LATP and LAGP Solid Electrolytes

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