Inhibition of lithium dendrites and dead lithium by an ionic liquid additive toward safe and stable lithium metal anodes

et al. 2022

ACS Nano

For developing the reversible lithium metal anode, constructing an ideal solid electrolyte interphase (SEI) by regulating the Li + solvation structure is a powerful way to overcome the major obstacles of lithium dendrite and limited Coulombic efficiency (CE). Herein, spherical mesoporous molecular sieve MCM-41 nanoparticles are coated on a commercial PP separator and used to regulate the Li + solvation structure for lithium metal batteries (LMBs). The regulated solvation structure exhibits an agminated state with more contact ion pairs (CIPs) and ionic aggregates (AGGs), which successfully construct a homogeneous inorganic-rich SEI in the lithium anode. Meanwhile, the regulated solvation structure weakens the interaction between the solvents and Li + , resulting in low Li + desolvation energy and uniform Li deposition. Thus, a high CE (∼96.76%), dendrite-free Li anode, and stable Li plating/stripping cycling for approximately 1000 h are achieved in the regulated carbonate-based electrolyte without any additives. Therefore, regulating the Li + solvation structure in the electrolyte by employing a mesoporous material is a forceful way to construct an ideal SEI and harness lithium metal.

Section: Introductionmentioning

confidence: 99%

Regulating Solvation Structures Enabled by the Mesoporous Material MCM-41 for Rechargeable Lithium Metal Batteries

Zhao

et al. 2022

ACS Nano

“…As a flexible anion with weak interactions, FSI – is capable of reducing the interaction with nearby cations, which contributes to the stability of the cell reaction . Sugimoto et al reported ILs containing lithium salts (0.3 mol kg –1 LiTFSI) in 1-ethyl-3-methylimine (EMImFSI) and EMImTFSI electrolytes.…”

Section: Ils As Solvent Of Electrolyte Saltmentioning

confidence: 99%

“…As a flexible anion with weak interactions, FSI − is capable of reducing the interaction with nearby cations, which contributes to the stability of the cell reaction. 32 Sugimoto et al 33 reported ILs containing lithium salts (0.3 mol kg −1 LiTFSI) in 1-ethyl-3methylimine (EMImFSI) and EMImTFSI electrolytes. The two IL electrolytes and 1.0 M of LiPF 6 /EC+DMC electrolyte were used in the cell system with a silicon−nickel−carbon (Si−Ni−C) composite as the anode.…”

Section: Ils As Solvent Of Electrolyte Saltmentioning

confidence: 99%

Challenges and Opportunities of Ionic Liquid Electrolytes for Rechargeable Batteries

Crystal Growth & Design

Jia

et al. 2022

Ionic liquids (ILs) feature excellent thermal stability, high safety, high conductivity, wide electrochemical window, low vapor pressure, structural designability, and noncombustibility. For secondary batteries serving as green electrolyte solvents, their performance, including thermal stability and capacity, can be greatly improved. Therefore, the application of an ionic liquid in a battery has increasingly become a hot spot for current research. To better understand the roles that ILs play in battery systems, this review on ILs as electrolytes is categorized into several parts: solvents for related electrolyte salts; compounded with conventional electrolytes; IL-based polymer electrolytes; functionalized ILs; and other ILbased solid electrolytes that are expected to be alternatives for organic solvents. The progress of research related to ILs in battery systems, the prospects of their applications, and the development aspects are discussed.

“…[5][6][7] However, the large volume changes and Li dendrites formed during cycling on metallic Li anodes lead to low Coulombic efficiency (CE), poor cycle stability, and even shortcircuiting-related safety hazards, therefore hindering the commercial application of LMBs. [8][9][10] To solve these problems, numerous efforts have been proposed during the past few decades, including designing a stable and uniform artificial solid electrolyte interface (SEI), [11][12][13][14] developing electrolyte additives to help uniform Li deposition or stabilize SEI, [15][16][17][18] employing highmodulus solid-state electrolyte (SSE) to inhibit the growth of lithium dendrites, [19][20][21][22][23] replacing lithium metal with lithium alloy to suppress dendritic lithium formation, 24,25 and constructing Li metal anode with novel structure by nanotechnology to regulate Li-ion plating/stripping behavior and mitigate the volume change during repeated cycling. [26][27][28][29][30] Although the artificial SEI is more uniform and flexible than selfdriven SEI, it still cannot stand the volume changes after hundreds of cycles.…”

Section: Introductionmentioning

confidence: 99%

A novel design of 3D carbon host for stable lithium metal anode

Liu

et al. 2022

Carbon Energy

Rational design of porous conductive hosts with high electrical conductivity, large surface area, and adequate interior space is desirable to suppressing dendritic lithium growth and accommodating large volume change of lithium metal anode during the Li plating/stripping process. However, due to the conductive nature of the conductive hosts, Li is easily deposited directly on the top of the hosts, which hinders it from fully functioning. To circumvent the issue, in this study, we designed a novel porous carbon host with a gradient‐pore‐size structure based on one‐dimensional (1D) carbon with different diameters. With this kind of host, stable cycling with high and stable Coulombic efficiency of ~98% is achieved at 0.5 mA cm−2 with an areal capacity of 1 mAh cm−2 over 320 cycles. In contrast, the normal three‐dimensional (3D) carbon nanotube host presents a moss‐like Li morphology with wildly fluctuating Coulombic efficiency after 100 cycles. The results reveal that the unique gradient‐pore‐size structure of the 3D conductive host greatly improves the performance of lithium metal batteries.