Dual electrolyte additives of potassium hexafluorophosphate and tris (trimethylsilyl) phosphite for anode-free lithium metal batteries

Hagos, Teklay Mezgebe; Berhe, Gebregziabher Brhane; Bezabh, Hailemariam Kassa; Abrha, Ljalem Hadush; Beyene, Tamene Tadesse; Huang, Chen‐Jui; Yang, Yichuan; Su, Wei‐Nien; Dai, Hongjie; Hwang, Bing‐Joe

doi:10.1016/j.electacta.2019.05.061

Cited by 81 publications

(47 citation statements)

References 40 publications

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“…3g ) can be calculated by subtracting the value in the first cycle with that of the second cycle from the Li/Cu cell protocol. To conclude, the Li/Cu cell is a useful protocol to provide reliable information for the study of electrolyte 27 , 28 , 31 , and surface engineering approaches 29 , 36 , 37 for mitigating the irr-CE ascribed to dead Li and SEI formation.…”

Section: Resultsmentioning

confidence: 99%

Decoupling the origins of irreversible coulombic efficiency in anode-free lithium metal batteries

et al. 2021

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Anode-free lithium metal batteries are the most promising candidate to outperform lithium metal batteries due to higher energy density and reduced safety hazards with the absence of metallic lithium anode during initial cell fabrication. In general, researchers report capacity retention, reversible capacity, or rate capability of the cells to study the electrochemical performance of anode-free lithium metal batteries. However, evaluating the behavior of batteries from limited aspects may easily overlook other information hidden deep inside the meretricious results or even lead to misguided data interpretation. In this work, we present an integrated protocol combining different types of cell configuration to determine various sources of irreversible coulombic efficiency in anode-free lithium metal cells. The decrypted information from the protocol provides an insightful understanding of the behaviors of LMBs and AFLMBs, which promotes their development for practical applications.

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Section: Resultsmentioning

confidence: 99%

Decoupling the origins of irreversible coulombic efficiency in anode-free lithium metal batteries

et al. 2021

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“…Anode-free Full Cells and the Role of a Sulfide-Rich SEI In this study, the anode-free full-cell configuration (Ni||Li 2 S) is used to effectively investigate the dynamics of Li deposition, as demonstrated with numerous recent work. [19][20][21][22][23][24][25][26][27][28][29] Assembled in the discharged state, it employs a fully lithiated Li 2 S cathode paired with a bare nickel (Ni) foil current collector (Figure 1A). 29 The amount of Li and S is stoichiometrically balanced and the Li/S capacity ratio (analogous to N/P ratio) is exactly equal to 1.…”

Section: Resultsmentioning

confidence: 99%

Anode-free, Lean-Electrolyte Lithium-Sulfur Batteries Enabled by Tellurium-Stabilized Lithium Deposition

Nanda

Bhargav

Manthiram

2020

Joule

145

111

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For realizing practically viable lithium-sulfur (Li-S) batteries, it is imperative to stabilize Li deposition and improve cyclability while reducing excess Li and electrolyte. We have discovered that introducing tellurium (Te) into the Li-S system as a cathode additive significantly improves the reversibility of Li plating and stripping by forming a tellurized and sulfide-rich solid-electrolyte interphase (SEI) layer on the Li surface. A remarkable improvement in cyclability is demonstrated in anode-free full cells with limited Li inventory and large-area Li-S pouch cells under lean electrolyte conditions. Tellurium reacts with polysulfides to generate soluble polytellurosulfides that migrate to the anode side and form stabilizing lithium thiotellurate and lithium telluride in situ as SEI components. A significant reduction in electrolyte decomposition on the Li surface is also engendered. This work demonstrates Te inclusion as a viable strategy for stabilizing Li deposition and establishes a robust evaluation framework for preserving electrochemical performance under limited Li and limited electrolyte conditions.

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“…3g. The Li//Cu cell is a useful protocol to provide reliable information for the study of electrolyte 23,24,27 , and surface engineering approaches 25,31,32 for mitigating the irreversible Coulombic efficiency ascribed to dead Li formation and reductive electrolyte decomposition.…”

Section: Resultsmentioning

confidence: 99%

“…Meanwhile, several key factors would still affect the cycling performance of LMB and are crucial in achieving high specific energy of 500 Wh kg -1 demanded by electric vehicle energy-storage market such as electrolyte amount 17 , temperature 18 , pressure 19 , amount of Li or cahode 20,21 , and current density applied 9 , etc. Recently, Anode-free lithium metal batteries (AFLMBs) are considered as phenomenal energy storage systems due to higher energy density than that of LMB which with excess Li in the system, and greatly reduced safety risks since no Li metal is used during cell manufacturing, which remarkably increases the simplicity of cell fabrication and reduces the cost of cell assembly, too 22,23,24,25,26,27 .…”

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confidence: 99%

Unfolding the Hidden Message of Anode-Free Lithium Metal Battery

Huang¹,

Thirumalraj²,

Tao³

et al. 2020

Preprint

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Lithium metal batteries (LMBs) have been revisited and gained great attention due to significantly mitigated formation of Li dendrite in the past decade. Recently, anode-free lithium metal batteries (AFLMBs) are proposed and have been studied intensively to potentially outperform LMBs due to higher energy density and reduced safety hazards since the absence of Li metal during the fabrication process of the cell. In general, researchers compare capacity retention, reversible capacity, or rate capability of the cells to study the electrochemical performance of batteries. However, evaluating the behavior of batteries from limited aspects would easily overlook other information hidden deep inside the meretricious results or even lead to misguided data interpretation. In this work, an integrated protocol combining different types of cell configuration is proposed and validated for the first time to unravel the concealed messages in LMBs and AFLMBs. Irreversible coulombic efficiency (irr-CE) from various contributions including reductive electrolyte decomposition, dead Li formation, 1st intrinsic irreversible capacity of a cathode, and the subsequent irreversible reactions at cathode containing oxidative electrolyte decomposition and cathode degradation upon cycling are successfully determined separately by the integrated protocol for the first time. The decrypted information obtained from the proposed protocol provides an insightful understanding of behaviors of LMBs and AFLMBs, which promotes their development for practical applications.

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Dual electrolyte additives of potassium hexafluorophosphate and tris (trimethylsilyl) phosphite for anode-free lithium metal batteries

Cited by 81 publications

References 40 publications

Decoupling the origins of irreversible coulombic efficiency in anode-free lithium metal batteries

Decoupling the origins of irreversible coulombic efficiency in anode-free lithium metal batteries

Anode-free, Lean-Electrolyte Lithium-Sulfur Batteries Enabled by Tellurium-Stabilized Lithium Deposition

Unfolding the Hidden Message of Anode-Free Lithium Metal Battery

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