Enhancing the electrochemical performances of Li7P3S11 electrolyte through P2O5 substitution for all-solid-state lithium battery

Guo, Yayu; Guan, Huilan; Wu, Peng; Li, Xuelei; Ma, Yue; Song, Dawei; Zhang, Hongzhou; Li, Chunliang; Zhang, Lianqi

doi:10.1016/j.ssi.2020.115506

Cited by 19 publications

(10 citation statements)

References 38 publications

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“…37 However, its electrochemical stability at low voltages remains to be resolved prior to application in the ASS battery. 38,39 Li 3 PO 4 , P 2 O 5 , and Li 2 OHBr could improve its durability Energy & Fuels 41 The addition of LiI to Li 3 PS 4 could ameliorate its stability against Li metal due to the formation of a LiI-containing interface. This interface is naturally insulating to electronic conduction and thus suppresses the Li 3 PS 4 reduction reaction.…”

Section: Resultsmentioning

confidence: 99%

“…Li 7 P 3 S 11 SE is well-known for its excellent ionic conductivity, which reaches 1.7 × 10 –2 S cm –1 at 25 °C . However, its electrochemical stability at low voltages remains to be resolved prior to application in the ASS battery. , Li 3 PO 4 , P 2 O 5 , and Li 2 OHBr could improve its durability against Li metal. − A density functional theory study indicated that Li 7 P 3 S 11 and other sulfide-based SEs are naturally unstable against Li metal . The addition of LiI to Li 3 PS 4 could ameliorate its stability against Li metal due to the formation of a LiI-containing interface.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of CaI₂-Doped Li₇P₃S₁₁ by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

et al. 2022

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Here, (100 – x)Li7P3S11–xCaI2 (mol %) solid electrolytes (SEs) were prepared using the liquid-phase method with acetonitrile as the reaction medium. The prepared SEs showed an X-ray diffraction pattern assigned to the Li7P3S11 crystal phase containing Li4P2S6 and Li3PS4 as a secondary phase. The diffraction peaks originated from the Li7P3S11 crystal phase were shifted to the lower angle side by CaI2 doping, which indicated the Li7P3S11 crystal structure doped with Ca2+ and I–. Scanning electron microscopy–energy-dispersive spectroscopy (SEM–EDS) results showed that CaI2 was well-dispersed in the obtained SEs. Based on solid-state 31P nuclear magnetic resonance, the total area fraction of the peaks assigned to PS4 3– and P2S7 4– anions in the Li7P3S11 structure changed from 24.8% in x = 0 to 31.2% in x = 2. This observation indicated that the 98Li7P3S11–2CaI2 involved a higher purity of the Li7P3S11 crystal phase compared with the pristine Li7P3S11. CaI2 doping improved both ionic conductivity and activation energy, from 2.0 × 10–4 S cm–1 and 41 kJ mol–1 to 8.0 × 10–4 S cm–1 and 35 kJ mol–1, respectively, for Li7P3S11 prepared by liquid-phase synthesis (comparing samples with x = 0 and 2, respectively). Stability against lithium metal was also enhanced with CaI2 doping. Graphite–SE composites were also prepared by the liquid-phase method, in which natural graphite flakes were added to the SE precursor suspensions. SEM–EDS results indicated the formation of secondary particles composed of graphite flakes and SE nanoparticles. The stability of an all-solid-state cell employing the composite with x = 2 outperformed that with x = 0.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Preparation of CaI₂-Doped Li₇P₃S₁₁ by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

et al. 2022

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“…It is common to replace sulfur with oxygen, since oxygen doping can reduce the chemical potential difference between the oxide cathodes and the SSEs, thus inhibiting the generation of a layer of space charge layer. Guo et al [109] . doped Li 10 GeP 2 S 12 with P 2 O 5 .…”

Section: Electrode Interface Instabilitymentioning

confidence: 99%

Air Stability and Interfacial Compatibility of Sulfide Solid Electrolytes for Solid‐State Lithium Batteries: Advances and Perspectives

Cai

Zhao

et al. 2022

ChemElectroChem

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Sulfide solid electrolytes (SSEs) possess higher ionic conductivity compared to commonly used oxide electrolytes, and are expected to enable high‐safety, high‐energy‐density solid‐state batteries. However, the air sensitivity and interface instability of SSEs greatly limit their applications. Herein, research on the stability of SSEs is reviewed. The mechanisms for the air and interface instability of the SSEs are revealed. In addition, methods to improve the stability of SSEs are discussed. The air stability of SSEs is closely related to their structures, which can be modified by chemical or physical interactions to tackle the problem. Interface instability induced by physical contact, interface side reactions, and other issues between SSEs and electrodes is another problem, hindering their commercialization. An in‐depth understanding of SSEs is offered as well as the prospects of SSEs.

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“…When in contact with a humid ambient atmosphere, partial hydrolysis of sulfide electrolytes with moisture produces toxic H 2 S and degrades their structure, yielding reduced Li-ion conductivities and increased safety issues. A typical modification method applied to enhance the humidity resistance of sulfide electrolytes is to introduce oxygen into the structure. − Replacing S with O in sulfide electrolytes can mitigate the hydrolysis reactions and enhance the chemical stability toward moisture. The main reason is that the nonbridging O is introduced into the structure after the oxygen atom is doped.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Moisture and Electrochemical Stability of the Li_5.5PS_4.5Cl_1.5 Electrolyte by Oxygen Doping

Peng

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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Chlorine-rich argyrodite-type solid electrolyte Li5.5PS4.5Cl1.5 has been a promising choice for solid-state batteries (SSBs) because of its ultrafast Li-ion conduction. However, the poor air/moisture stability and low electrochemical stability with pristine high-voltage cathodes hinder their applications. Herein, O-substituted Li5.5PS4.5–x O x Cl1.5 (x = 0, 0.075, 0.175, and 0.25) solid electrolytes are successfully synthesized. Among them, Li5.5PS4.425O0.075Cl1.5 delivers high ionic conductivity, improved moisture resistance, and enhanced electrochemical stability in higher voltage windows. SSBs using Li5.5PS4.425O0.075Cl1.5 show higher capacities and superior cyclability than those using Li5.5PS4.5Cl1.5 combined with a pristine LiNi0.8Mn0.1Co0.1O2 cathode when operated at a high end-of-charge voltage of 4.5 V (vs Li+/Li0). Moreover, the batteries exhibit outstanding performance in a wide temperature range. This work provides a strategy to modify the inherent drawbacks of sulfide electrolytes, promoting their practical applications.

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Enhancing the electrochemical performances of Li7P3S11 electrolyte through P2O5 substitution for all-solid-state lithium battery

Cited by 19 publications

References 38 publications

Preparation of CaI₂-Doped Li₇P₃S₁₁ by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

Preparation of CaI₂-Doped Li₇P₃S₁₁ by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

Air Stability and Interfacial Compatibility of Sulfide Solid Electrolytes for Solid‐State Lithium Batteries: Advances and Perspectives

Enhancing Moisture and Electrochemical Stability of the Li_5.5PS_4.5Cl_1.5 Electrolyte by Oxygen Doping

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Enhancing the electrochemical performances of Li7P3S11 electrolyte through P2O5 substitution for all-solid-state lithium battery

Cited by 19 publications

References 38 publications

Preparation of CaI2-Doped Li7P3S11 by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

Preparation of CaI2-Doped Li7P3S11 by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

Air Stability and Interfacial Compatibility of Sulfide Solid Electrolytes for Solid‐State Lithium Batteries: Advances and Perspectives

Enhancing Moisture and Electrochemical Stability of the Li5.5PS4.5Cl1.5 Electrolyte by Oxygen Doping

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Product

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Preparation of CaI₂-Doped Li₇P₃S₁₁ by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

Preparation of CaI₂-Doped Li₇P₃S₁₁ by Liquid-Phase Synthesis and Its Application in an All-Solid-State Battery with a Graphite Anode

Enhancing Moisture and Electrochemical Stability of the Li_5.5PS_4.5Cl_1.5 Electrolyte by Oxygen Doping