Fast Lithium Ion Conduction in Garnet‐Type Li₇La₃Zr₂O₁₂.

Abstract

Fast Lithium Ion Conduction in Garnet-Type Li7La3Zr2O12. -The title compound is synthesized by solid state reaction of a stoichiometric mixture of LiOH, La 2 O 3 , and ZrO2 (annealing at 1230°C, 36 h). The samples are characterized by powder XRD and electrical conductivity measurements. The total conductivity of 3·10 -4 Scm 1of the new fast Li + ion conductor with garnet-like structure is better than that of any other family of solid Li + ion conductors and all previously described lithium garnets. The high Li + ion conductivity, good thermal and chemical stability against reactions with prospective electrode materials, environmental benignity, availability of the starting materials, low cost, and ease of preparation of Li7La3Zr2O12 suggest that this Zr-containing lithium garnet is a promising solid electrolyte for all-solid-state lithium ion rechargeable batteries. -(MURUGAN*, R.; THANGADURAI, V.; WEPPNER, W.; Angew.

Effect of Sintering Additives on Relative Density and Li‐ion Conductivity of Nb‐Doped Li7La3ZrO12 Solid Electrolyte

“…The formation of the cubic phase of the garnet material is clearly seen in the XRD patterns, in a good agreement with the results reported for LLZO obtained at high temperatures. 4 In the XRD patterns of the samples with glasses, LiOH or LiCO 3 , crystalline phases other than LLZNbO were not observed. Thus, glass additives, as expected, are present as an amorphous phase in the grain boundary, whereas the lithium compounds are incorporated to the garnet structure during sintering process.…”

“…High temperatures are necessary not only to produce a dense ceramic, but also to stabilize the cubic phase responsible of the high conductivity of this kind of material. [4][5][6][7][8][9][10][11][12][13][14] The optimization of higher Li-ion conductivities at lower sintering temperatures has been led mainly by the formulation of new chemical composition [15][16][17][18][19][20][21][22][23][24] and microstructural modification of garnet material by the incorporation of sintering additives. [25][26][27][28][29][30][31][32] Both approaches have allowed reducing the sintering temperatures and processing periods with a better control of the chemical composition.…”

“…Kumazaki et al 25 have confirmed the presence of Li-Al-Si-O glass phase with nano-crystalline LiAlSiO 4 at grain boundaries in the Li 7 La 3 Zr 2 O 12 (LLZO) garnet materials obtained at high temperatures (1230°C during 36 hour). 4 Al and Si were incorporated to the LLZO garnet structure from the material used for ball milling and crucibles. The maximum Liion conductivity at 25°C was of 6.80 9 10 À4 S/cm.…”

Sulfide Glass‐Ceramic Electrolytes for All‐Solid‐State Lithium and Sodium Batteries

“…Typical solid electrolytes with Li + or Na + ion conductivity are summarized in Table 1. [5][6][7][14][15][16][17][18][19][20][21][22][23][24][25] Oxide and sulfide electrolytes with high conductivities have been reported so far. Sulfide electrolytes have a relatively higher conductivity than oxide electrolytes.…”

Sintering behavior of garnet‐type Li6.4La3Zr1.4Ta0.6O12 in Li2CO3 atmosphere and its electrochemical property

“…Compared with polymer electrolytes and sulfide solid electrolytes, the oxides electrolytes have a wide electrochemical stable window and good chemical stability. [1][2][3] Garnet-type metal oxide such as Li 7 La 3 Zr 2 O 12 (LLZO) is considered as one of the most promising solid electrolytes among the inorganic solid electrolytes, 4 for it shows high Li + ionic conductivity, high stability with lithium metal and wide electrochemical window. 5 The sintering process, 6 doping strategy, 7-9 microstructure 10 and composite design 11 have been widely investigated to enhance its performance.…”