Investigation of properties and performance of three novel highly concentrated ether-functionalised ionic liquid electrolytes for lithium metal batteries

Warrington, Anna; Hasanpoor, Meisam; Balkis, Ali; Howlett, Patrick C.; Hutt, Oliver E.; Forsyth, Maria; Pringle, Jennifer M.

doi:10.1016/j.ensm.2023.102984

Cited by 8 publications

(3 citation statements)

References 105 publications

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“…As a result, this facilitates cooperation from anions in its dissolution structure, leading to stable cycling performance. However, this results in increased concentration, which adversely affects electrolyte wetting, and ion pairs begin to form, increasing the viscosity of the electrolyte and decreasing the ionic conductivity [77,78]. In contrast, studies have shown that by dissolving the N additive in a binary electrolyte or specific electrolyte, concentrations of 2 M or higher can be achieved without adversely affecting performance [79,80].…”

Section: Ether-based Electrolytesmentioning

confidence: 99%

Behavior of NO3−-Based Electrolyte Additive in Lithium Metal Batteries

Kim,

Yoon,

Chae

2024

Batteries

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While lithium metal is highly desired as a next-generation battery material due to its theoretically highest capacity and lowest electrode potential, its practical application has been impeded by stability issues such as dendrite formation and short cycle life. Ongoing research aims to enhance the stability of lithium metal batteries for commercialization. Among the studies, research on N-based electrolyte additives, which can stabilize the solid electrolyte interface (SEI) layer and provide stability to the lithium metal surface, holds great promise. The NO3− anion in the N-based electrolyte additive causes the SEI layer on the lithium metal surface to contain compounds such as Li3N and Li2O, which not only facilitates the conduction of Li+ ions in the SEI layer but also increases its mechanical strength. However, due to challenges with the solubility of N-based electrolyte additives in carbonate-based electrolytes, extensive research has been conducted on electrolytes based on ethers. Nonetheless, the low oxidative stability of ether-based electrolytes hinders their practical application. Hence, a strategy is needed to incorporate N-based electrolyte additives into carbonate-based electrolytes. In this review, we address the challenges of lithium metal batteries and propose practical approaches for the application and development of N-based electrolyte additives.

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Section: Ether-based Electrolytesmentioning

confidence: 99%

Behavior of NO3−-Based Electrolyte Additive in Lithium Metal Batteries

Kim,

Yoon,

Chae

2024

Batteries

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“…However, such porous framework materials tend to have poor thermal/chemical stability, and the smaller pore size structure limits the migration of Li + and large organic ions. LiIL sequestered into porous frameworks, however, have much higher viscosities than conventional organic liquid electrolytes after the addition of lithium salts, which drastically reduces the Li + migration efficiency and leads to lower ionic conductivities …”

Section: Introductionmentioning

confidence: 99%

“…LiIL sequestered into porous frameworks, however, have much higher viscosities than conventional organic liquid electrolytes after the addition of lithium salts, which drastically reduces the Li + migration efficiency and leads to lower ionic conductivities. 29 Montmorillonite, a silicate with a two-dimensional (2D) lamellar structure, has a large specific surface area consisting of two silica−oxygen tetrahedral sheets interlayered with aluminum (magnesium) oxygen (hydroxyl) octahedral sheets. 30 It is a 2:1 layered silicate, with some exchangeable alkali-metal cations adsorbed between its layers.…”

Section: Introductionmentioning

confidence: 99%

Development of 2D Framework Structures-Based Solid-State Electrolytes with Fast Ion-Transport Channels Using Ionic Liquids Encapsulated in 2D-LiMNT Frameworks

Li,

Zhou,

Meng

et al. 2024

ACS Appl. Energy Mater.

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The use of three-dimensional (3D) framework materials to encapsulate ionic liquids is a novel method for the preparation of solid-state electrolytes (SSEs). However, these types of SSEs face problems such as unstable framework structures, narrow pore sizes that restrict organic macromolecules while hindering Li + migration, and the high viscosity of ionic liquids. Herein, a two-dimensional (2D) lithium-montmorillonite (LiMNT) framework was used to encapsulate ionic liquids containing a propylene carbonate (PC) solvent. The PC solvent reduced the viscosity of the ionic liquids and activated Li + in LiMNT, and an efficient 2D Li + transport channel was formed inside the SSE. The ionic conductivity of the prepared lithium-based ionic liquid (LiIL)-PC@ LiMNT SSE was as high as 6.2 × 10 −4 S•cm −1 , and a Li + mobility number of 0.35 was observed. At a current density of 0.2 mA•cm −2 , the lithium dissolution−deposition experiment of lithium symmetric batteries operated stably for 1000 h. Solid-state lithium metal batteries prepared with LiFePO 4 cathodes were able to achieve a reversible capacity of 121.1 mAh•g −1 after 120 cycles at 0.3C, with a capacity retention of 87.4%. This demonstrated the excellent performance of the LiIL-PC@LiMNT SSE. This work provides a novel design idea for the development of solid-state electrolytes based on 2D framework structures using ionic liquids encapsulated in 2D materials and for the construction of fast ion-transport channels.

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Leakage‐Free and Non‐Flammable High‐Safety Li Metal Battery Using 85.3 wt.% Multifunctional Organic Lithium Salt as Quasi‐Solid Electrolyte

Liu,

Qiao,

Lin

et al. 2024

Adv Funct Materials

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Safety issues of lithium metal batteries caused by leakageable, inflammable, and unstable electrolytes and lithium dendrites are a major concern worldwide. Herein, an ultra‐concentrated electrolyte composed of 85.3 wt.% of a novel phosphate quaternary ammonium lithium salt (PQ‐3Li) in fluoroethylene carbonate is prepared, labeled as CPQE. CPQE reveals an exceptional ionic conductivity (0.32 × 10−3 S cm−1), a high lithium transference number (0.66), an electrochemical stability window above 6 V, and a superb fire resistance. Li|CPQE|Li cells show stable cycling performance without lithium dendrites for 1000 h, and a solid‐electrolyte‐interface layer with an inorganics‐rich inner layer and an organics‐rich outer layer is confirmed using computation simulation, electron probe microanalysis, and X‐ray photoelectron spectroscopy. Li|CPQE|NCM cells present a discharge capacity of 162 mAh g−1 at 0.1 C, and a Coulombic efficiency of up to 99%. A commercial LED bulb can be lighted up by the Li|CPQE|NCM cell for at least 1 h without performance deterioration while prolonging the cycling time. The fabricated CPQE‐based pouch cells own terrific safety and power supply capacity. No leakage, thermal runaway, combustion, or explosion behavior is detected during the nailing penetration test, implying large potential applications for developing the next generation of high‐safety lithium batteries.

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Investigation of properties and performance of three novel highly concentrated ether-functionalised ionic liquid electrolytes for lithium metal batteries

Cited by 8 publications

References 105 publications

Behavior of NO3−-Based Electrolyte Additive in Lithium Metal Batteries

Behavior of NO3−-Based Electrolyte Additive in Lithium Metal Batteries

Development of 2D Framework Structures-Based Solid-State Electrolytes with Fast Ion-Transport Channels Using Ionic Liquids Encapsulated in 2D-LiMNT Frameworks

Leakage‐Free and Non‐Flammable High‐Safety Li Metal Battery Using 85.3 wt.% Multifunctional Organic Lithium Salt as Quasi‐Solid Electrolyte

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