Induction of planar Li growth with designed interphases for dendrite-free Li metal anodes

Han, Xiang; Chen, Jizhang; Chen, Minfeng; Zhou, Weijun; Zhou, Xiaoyan; Wang, Guanwen; Wong, Ching‐Ping; Liu, Bo; Luo, Linshan; Chen, Songyan; Shi, Siqi

doi:10.1016/j.ensm.2021.04.029

Cited by 50 publications

(19 citation statements)

References 46 publications

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“…Only Ge 4+ was detected on the separator surface in contact with the cathode (Figure c), which implied that LAGP was not reduced. Ge was reduced inside the separator and on the anode side, promoting the stabilization of the SEI . Ge 3+ was observed only inside the PI–LAGP.…”

Section: Resultsmentioning

confidence: 99%

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PI-LAGP Separator─Construction, Battery Application Performance, and Chemical Valence Changes of Germanium

Liu

Cao

Liang

et al. 2022

ACS Appl. Polym. Mater.

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We successfully prepared a porous polyimide film (PIBPDA–ODA) with a three-dimensional network structure using an optimized amount of pore-forming agents and a nonsolvent-induced phase separation method. Then, the nanoparticles of an inorganic ion conductor Li1.5Al0.5Ge1.5(PO4)3 (LAGP) were filled into the pore of the PIBPDA–ODA to form a PI–LAGP composite film with an ionic conductivity of 1.42 mS·cm–1 and a lithium-ion transference number of 0.87 (at room temperature). A NCM811||Li battery assembled with the PI–LAGP separator delivered a discharge capacity of 191.7 mA h·g–1 during the first cycle at 0.2 C which retained 167.5 mA h·g–1 (87.4%) after 200 cycles, while its first discharge capacity was 151.7 mA h·g–1 at 5 C which retained 127 mA h·g–1 (83.7%) after 200 cycles. In addition, the Li||PI–LAGP||Li symmetric battery was found to run stably at a current density of 5 mA cm–2 for more than 1,000 h. The three-dimensional network structure of the composite film and the evenly filled LAGP particles improved the transport of lithium ions, promoted the uniform deposition of Li ions during battery cycling, inhibited the growth of Li dendrites, and induced the rapid formation of a stable and dense solid electrolyte interface layer on the surface of the Li anode. In addition, we also investigated the valence state changes of Ge4+ ions on the surface and inside the composite film.

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Section: Resultsmentioning

confidence: 99%

“…Ge was reduced inside the separator and on the anode side, promoting the stabilization of the SEI. 52 Ge 3+ was observed only inside the PI−LAGP. The reduction of Ge 4+ in LAGP may decrease the voltage of battery.…”

Section: Effects Of Variations In Pore-forming Additivementioning

confidence: 94%

PI-LAGP Separator─Construction, Battery Application Performance, and Chemical Valence Changes of Germanium

Liu

Cao

Liang

et al. 2022

ACS Appl. Polym. Mater.

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“…Owing to the high theoretical specific capacity (3680 mAh g −1 ) and low electrochemical redox potential (−3.04 V vs the standard hydrogen electrode), metallic lithium (Li) anode has been regarded as the most promising candidate for lithium-based batteries. [1][2][3][4] Unfortunately, during repeated charge-discharge processes, drastic metallic Li dendrites are easy to be generated at the surface of Li anodes. [5][6][7][8] Moreover, the uncontrollable Li dendrites cause a series of issues such as severe volume changes, low Coulombic efficiency (CE) as well as poor cycle life, which impede the commercial application of Li anodes.…”

Section: Introductionmentioning

confidence: 99%

Eliminating Lightning‐Rod Effect of Lithium Anodes via Sine‐Wave Analogous MXene Layers

Chen

Shi

et al. 2022

Advanced Energy Materials

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Lithium metal anodes are regarded as the most promising candidate for rechargeable lithium‐based batteries, but uncontrollable Li dendrites hinder further applications. Here, sine‐wave analogous MXene (Ti3C2Tx) (SWA‐MXene) layers are produced by spreading aqueous MXene dispersion onto the sectional surface of a metallic coil and subsequently drying at room temperature. COMSOL Multiphysics simulations demonstrate that the low curvature in SWA‐MXene layers homogenizes the distributions of lithium ions and electric field, efficiently eliminating the lightning‐rod effect on the surface of aligned electrodes in the process of Li deposition. As a result, the flexible SWA‐MXene layers show a low overpotential for lithium nucleation (≈13.5 mV at 0.05 mA cm−2) and deep plating–stripping capacities up to 40 mAh cm−2, as well as a long cycle life up to 1250 h. Full cells consisting of a SWA‐MXene–Li anode and a LiFePO4 cathode also exhibit a durable cycle life up to 420 cycles at 1088 mA g−1.

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“…Lithium metal is a promising anode candidate for constructing high-energy-density lithium batteries due to its high specific capacity (3860 mAh g −1 ) and low redox potential (−3.05 V vs. standard hydrogen electrode) [ 1 , 2 ]. Currently, its development is plagued by the intrinsic safety issues of liquid electrolytes because of the flammability of organic solvents used [ 3 , 4 ].…”

Section: Introductionmentioning

confidence: 99%

Improving the Stability of Lithium Aluminum Germanium Phosphate with Lithium Metal by Interface Engineering

et al. 2022

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Lithium aluminum germanium phosphate (LAGP) solid electrolyte is receiving increasing attention due to its high ionic conductivity and low air sensitivity. However, the poor interface compatibility between lithium (Li) metal and LAGP remains the main challenge in developing all-solid-state lithium batteries (ASSLB) with a long cycle life. Herein, this work introduces a thin aluminum oxide (Al2O3) film on the surface of the LAGP pellet as a physical barrier to Li/LAGP interface by the atomic layer deposition technique. It is found that this layer induces the formation of stable solid electrolyte interphase, which significantly improves the structural and electrochemical stability of LAGP toward metallic Li. As a result, the optimized symmetrical cell exhibits a long lifetime of 360 h with an areal capacity of 0.2 mAh cm−2 and a current density of 0.2 mA cm−2. This strategy provides new insights into the stabilization of the solid electrolyte/Li interface to boost the development of ASSLB.

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Induction of planar Li growth with designed interphases for dendrite-free Li metal anodes

Cited by 50 publications

References 46 publications

PI-LAGP Separator─Construction, Battery Application Performance, and Chemical Valence Changes of Germanium

PI-LAGP Separator─Construction, Battery Application Performance, and Chemical Valence Changes of Germanium

Eliminating Lightning‐Rod Effect of Lithium Anodes via Sine‐Wave Analogous MXene Layers

Improving the Stability of Lithium Aluminum Germanium Phosphate with Lithium Metal by Interface Engineering

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