Effect of Sb-Ba codoping on the ionic conductivity of Li7La3Zr2O12 ceramic

Cao, Zhenzhu; Cao, Xueyan; Liu, Xiaoting; He, Wei; Gao, Yanfang; Liu, Jinrong; Zeng, Jiangtao

doi:10.1016/j.ceramint.2015.01.030

Cited by 30 publications

(11 citation statements)

References 27 publications

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“…Although the doping of single elements improves the ionic conductivity of LLZO to varying degrees, multiple studies have shown that synergistic codoping (Y/Ta, Al/Si, Sb/Ba, Al/Te, Ta/Ca, and Nb/Y) at different sites contributes to a more significant enhancement in ionic conductivity. To further reveal the synergistic mechanism of codoped LLZO, this paper reports the use of Al and Nb dopants to research the synergistic codoping modification of LLZO.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance of Al- and Nb-Codoped LLZO Ceramic Powder and Its Composite Solid Electrolyte

Wang

Liu

Duan

et al. 2021

ACS Appl. Energy Mater.

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Using a solid-state method, a Li6.25Al0.2La3Zr1.85Nb0.15O12 (LALZNO) ceramic solid-state electrolyte (SSE) was prepared by codoping with Al and Nb. A PEO-LiTFSI-20%LALZNO composite solid electrolyte (CSE) was prepared by incorporating LALZNO into a poly(ethylene oxide) (PEO) polymer using a solution casting method. Characterization of these materials shows that the lattice distortion caused by the codoping of Al and Nb into Li and Zr sites increases Li+ vacancy concentration and modifies Li+ transmission channels. The ionic conductivity of the LALZNO ceramic SSE at room temperature (RT, 25 °C) can reach 3.04 × 10–4 S/cm. When the LALZNO concentration in the LALZNO/PEO composite is 20 wt %, the PEO-LiTFSI-20%LALZNO CSE exhibits a maximum ionic conductivity (7.64 × 10–5 S/cm at RT), a wide electrochemical window (5.5 V vs Li/ Li+), and a high lithium-ion transport number (0.28). Testing a Li||PEO-LiTFSI-20%LALZNO||Li symmetrical cell shows that this solid electrolyte can be stably cycled for 500 h at 60 °C with a fixed areal capacity of 0.2 mAh/cm2. Furthermore, performance tests of the all-solid-state battery LiFePO4||PEO-LiTFSI-20%LALZNO||Li show that the CSE has excellent cycling and rate performance. This all-solid-state battery can stably cycle for more than 100 cycles under conditions of 60 °C and 0.2C. Furthermore, it retains a specific discharge capacity of 91.6% after 100 cycles, and its Coulombic efficiency is close to 100%.

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Section: Introductionmentioning

confidence: 99%

Enhanced Electrochemical Performance of Al- and Nb-Codoped LLZO Ceramic Powder and Its Composite Solid Electrolyte

Wang

Liu

Duan

et al. 2021

ACS Appl. Energy Mater.

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“…Several studies, both experimental and theoretical, have already investigated some of the effects of doping on LLZO. Three types of doping can be identified: (i) the substitution of Li ions by hypervalent cations such as Al [18,19] or Ga [20], (ii ) the substitution of the metal centers by cations such as Ce [21], Ta [22,23], W [24,25] and Nb [15], and (iii ) a co-doping by more than one of the two first options [26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

Doping in garnet-type electrolytes: Kinetic and thermodynamic effects from molecular dynamics simulations

Mottet

Marcolongo

Laino

et al. 2019

Phys. Rev. Materials

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To shed light on the impact of doping on the conductivity of garnet-type electrolytes, we use molecular dynamics with an ab-initio designed force-field to investigate the complex interplay between the carrier concentration and the kinetic and thermodynamic changes induced by the addition of hypervalent dopants. We particularly focus on the effect of the distribution of the doping agents and find that there is a need to perform a proper average over the frozen disorder introduced by the doping. We observe the competing effect between the decrease in concentration

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“…Although formation of Li vacancy could improve the Li ion conductivity, there should be an optimum Li vacancy content, where total conductivity should reach maximum . Further increase of Li vacancy will decrease the content of mobile Li ion and deteriorate the conductivity . In present study, the maximum conductivity has been obtained at x =0.2.…”

Section: Resultsmentioning

confidence: 55%

High lithium ionic conductivity in the garnet‐type oxide Li_7−2xLa₃Zr_2−xMo_xO₁₂ (x=0‐0.3) ceramics by sol‐gel method

Liu

Yang

et al. 2017

J Am Ceram Soc

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Lithium garnet-type oxides Li 7À2x La 3 Zr 2Àx Mo x O 12 (x=0, 0.1, 0.2, 0.3) ceramics were prepared by a sol-gel method. The influence of molybdenum on the structure, microstructure and conductivity of Li 7 La 3 Zr 2 O 12 were investigated by X-ray diffraction, scanning electron microscopy, and impedance spectroscopy. The cubic phase Li 7 La 3 Zr 2 O 12 has been stabilized by partial substitution of Mo for Zr at low temperature. The introduction of Mo (x≥0.1) can accelerate densification. Li 6.6 La 3 Zr 1.8 Mo 0.2 O 12 sintered at lower temperature 1100°C for 3 hours exhibits highest total ionic conductivity of 5.09 9 10 À4 S/cm. Results indicate that the Mo doping LLZO synthesized by sol-gel method effectively lowers its sintering temperature and improves the ionic conductivity.

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Effect of Sb-Ba codoping on the ionic conductivity of Li7La3Zr2O12 ceramic

Cited by 30 publications

References 27 publications

Enhanced Electrochemical Performance of Al- and Nb-Codoped LLZO Ceramic Powder and Its Composite Solid Electrolyte

Enhanced Electrochemical Performance of Al- and Nb-Codoped LLZO Ceramic Powder and Its Composite Solid Electrolyte

Doping in garnet-type electrolytes: Kinetic and thermodynamic effects from molecular dynamics simulations

High lithium ionic conductivity in the garnet‐type oxide Li_7−2xLa₃Zr_2−xMo_xO₁₂ (x=0‐0.3) ceramics by sol‐gel method

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Effect of Sb-Ba codoping on the ionic conductivity of Li7La3Zr2O12 ceramic

Cited by 30 publications

References 27 publications

Enhanced Electrochemical Performance of Al- and Nb-Codoped LLZO Ceramic Powder and Its Composite Solid Electrolyte

Enhanced Electrochemical Performance of Al- and Nb-Codoped LLZO Ceramic Powder and Its Composite Solid Electrolyte

Doping in garnet-type electrolytes: Kinetic and thermodynamic effects from molecular dynamics simulations

High lithium ionic conductivity in the garnet‐type oxide Li7−2xLa3Zr2−xMoxO12 (x=0‐0.3) ceramics by sol‐gel method

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Product

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High lithium ionic conductivity in the garnet‐type oxide Li_7−2xLa₃Zr_2−xMo_xO₁₂ (x=0‐0.3) ceramics by sol‐gel method