An acetamide additive stabilizing ultra-low concentration electrolyte for long-cycling and high-rate sodium metal battery

Jiang, Rui; Liu, Hong; Liu, Yongchao; Wang, Yueda; Patel, Sawankumar; Feng, Xuyong; Xiang, Hongfa

doi:10.1016/j.ensm.2021.07.047

Cited by 81 publications

(48 citation statements)

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“…Recently, more and more researchers are realizing that the Li + solvation structure and desolvation process can affect an electrode’s performance significantly. − However, it remains a challenge to illustrate the process, because the molecular behaviors in the bulk electrolyte and at the electrolyte–electrode interface are abstractive, dynamic, and non-quantitative . Despite the findings on the effect of solvation structure in electrolytes, the battery performance has been ascribed to the solvation-structure-derived SEI that has a specific composition, thickness, and/or morphology, − which is an endless loop that fails to involve the specific solvation structure-derived interfacial model (i.e., Li + desolvation process) in the liquid since the battery performance is ascribed to the SEI again. − Thus, different viewpoints need to be clarified and emphasized to set direct scientific relationships between molecular interactions of electrolyte species and electrode performance, so as to make a breakthrough in this field and beyond.…”

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confidence: 99%

Emerging Era of Electrolyte Solvation Structure and Interfacial Model in Batteries

et al. 2022

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Over the past two decades, the solid–electrolyte interphase (SEI) layer that forms on an electrode’s surface has been believed to be pivotal for stabilizing the electrode’s performance in lithium-ion batteries (LIBs). However, more and more researchers currently are realizing that the metal-ion solvation structure (e.g., Li+) in electrolytes and the derived interfacial model (i.e., the desolvation process) can affect the electrode’s performance significantly. Thus, herein we summarize recent research focused on how to discover the importance of an electrolyte’s solvation structure, develop a quantitative model to describe the solvation structure, construct an interfacial model to understand the electrode’s performance, and apply these theories to the design of electrolytes. We provide a timely review on the scientific relationship between the molecular interactions of metal ions, anions, and solvents in the interfacial model and the electrode’s performance, of which the viewpoint differs from the SEI interpretations before. These discoveries may herald a new, post-SEI era due to their significance for guiding the design of LIBs and their performance improvement, as well as developing other metal-ion batteries and beyond.

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Emerging Era of Electrolyte Solvation Structure and Interfacial Model in Batteries

et al. 2022

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“…[ 22–27 ] Metallic sodium may be the anode material with the most potential for various sodium batteries. [ 28–30 ]…”

Section: Introductionmentioning

confidence: 99%

“…[22][23][24][25][26][27] Metallic sodium may be the anode material with the most potential for various sodium batteries. [28][29][30] However, the security of batteries is something important for researchers to think about seriously, to some extent, affects the application of SMBs. [31] In the process of cycling, sodium dendrites can be formed on the surface of the electrode, thereby disrupting the stability of the entire interface.…”

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confidence: 99%

Sodiophilic Mg²⁺‐Decorated Ti₃C₂ MXene for Dendrite‐Free Sodium Metal Batteries with Carbonate‐Based Electrolytes

Jiang

Lin

Wei

et al. 2022

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Among the many kinds of sodium batteries, it is worth noting that SMBs have received wide attention at present due to their advantages, including higher theoretical capacity (≈1166 mAh g −1 ) and lower redox voltage (−2.714 V). [22][23][24][25][26][27] Metallic sodium may be the anode material with the most potential for various sodium batteries. [28][29][30] However, the security of batteries is something important for researchers to think about seriously, to some extent, affects the application of SMBs. [31] In the process of cycling, sodium dendrites can be formed on the surface of the electrode, thereby disrupting the stability of the entire interface. [32] This not only consumes the electrolyte, resulting in poor electrochemical performance but also penetrates the battery separator, leading to a range of security issues, including short circuiting or explosion. [33][34][35][36] Sodium dendrites have become a major issue for researchers hindering the further development of SMBs. To date, in light of this problem, according to the extremely safe and stable requirements for SMBs, researchers have provided a series of solutions for the suppression of sodium dendrites. For example, a suitable and advanced current collector such as Cu foam, [37] 3D porous Al, [38] and 1D/2D Na 3 Ti 5 O 12 -MXene has been designed. [39] A protective layer was built on the surface of Na foil, including an Al 2 O 3 thin layer. [40][41][42] Adjusting and using the various types of electrolyte includes two different types. The first is to find a novel electrolyte system. [17] The second is to improve and optimize the current electrolyte; in other words, some appropriate additives are added into the electrolyte. [43,44] For SMBs, the most frequently used current collector is commercial copper foil, but its disadvantages are equally notable. [45] For instance, the wettability of the electrolyte is poor, and obvious dendrites emerge on the surface of Cu foil in the cycle. [36] Therefore, commercial copper foil is selected as the current collector because of its lower coulombic efficiency and worse electrochemical stability. Improving the Cu current collector is a key part for widely promoting the usability of SMBs. From the phase diagram, Mg has a certain amount of solubility in sodium, and the 3D hierarchical structure with Mg clusters as the working electrode has excellent performance for SMBs. [46] Meanwhile, MXene, as a new 2D material, [47] not only has the capability to accommodate the univalent cationsThe advantages of sodium metal, such as abundant resources, low cost, high capacity, and high working potential, make it a promising metal anode. Unfortunately, the hazardous dendrite growth of sodium metal is one of the major hindrances for the practical application of sodium metal batteries (SMBs). By applying multifunctional Mg(II)@Ti 3 C 2 MXene as the protective layer for commercial Cu foil, the wettability of the electrolyte on the current collector is dramatically improved with the suppression of sodium dendrites. Moreover, the...

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“…Various electrolyte additives such as fluoroethylene carbonate, vinylene carbonate, , ethylene sulfite, borates, , sulfonates, phosphates, , and so forth have been developed to improve the stability and electrochemical performance of lithium metal anodes and high-voltage cathodes. Numerous research works have demonstrated that the LiF phase can be formed on the surface of the lithium metal anode in a fluorinated electrolyte solution (F-containing salts, solvents, and additives), and the LiF-rich SEI film can achieve homogeneous lithium ion flux and suppress the growth of lithium dendrites. − Similarly, the introduction of preferentially oxidized molecules can form a stable CEI film on the cathode surface. Si-based additives have recently received substantial attention as effective functional additives for high-voltage cathodes.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Electrolyte Additive Stabilizes Electrode–Electrolyte Interface Layers for High-Voltage Lithium Metal Batteries

Liu

Jiang

et al. 2021

ACS Appl. Mater. Interfaces

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A lithium metal anode and high nickel ternary cathode are considered viable candidates for high energy density lithium metal batteries (LMBs). However, unstable electrode–electrolyte interfaces and structure degradation of high nickel ternary cathode materials lead to serious capacity decay, consequently hindering their practical applications in LMBs. Herein, we introduced N,O-bis(trimethylsilyl) trifluoro acetamide (BTA) as a multifunctional additive for removing trace water and hydrofluoric acid (HF) from the electrolyte and inhibiting corrosive HF from disrupting the electrode–electrolyte interface layers. Furthermore, the BTA additive containing multiple functional groups (C–F, Si–O, Si–N, and CN) promotes the formation of LiF-rich, Si- and N-containing solid electrolyte interfacial films on a lithium metal anode and LiNi0.8Mn0.1Co0.1O2 (NMC811) cathode surfaces, thereby improving the electrode–electrolytes interfacial stability and mitigating the capacity decay caused by structural degradation of the layered cathode. Using the BTA additive had tremendous benefits through modification of both anode and cathode surface layers. This was demonstrated using a Li||NMC811 metal battery with the BTA electrolyte, which exhibits remarkable cycling and rate performances (122.9 mA h g–1 at 10 C) and delivers a discharge capacity of 162 mA h g–1 after 100 cycles at 45 °C. Likewise, this study establishes a cost-effective approach of using a single additive to improve the electrochemical performance of LMBs.

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An acetamide additive stabilizing ultra-low concentration electrolyte for long-cycling and high-rate sodium metal battery

Cited by 81 publications

References 50 publications

Emerging Era of Electrolyte Solvation Structure and Interfacial Model in Batteries

Emerging Era of Electrolyte Solvation Structure and Interfacial Model in Batteries

Sodiophilic Mg²⁺‐Decorated Ti₃C₂ MXene for Dendrite‐Free Sodium Metal Batteries with Carbonate‐Based Electrolytes

Multifunctional Electrolyte Additive Stabilizes Electrode–Electrolyte Interface Layers for High-Voltage Lithium Metal Batteries

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An acetamide additive stabilizing ultra-low concentration electrolyte for long-cycling and high-rate sodium metal battery

Cited by 81 publications

References 50 publications

Emerging Era of Electrolyte Solvation Structure and Interfacial Model in Batteries

Emerging Era of Electrolyte Solvation Structure and Interfacial Model in Batteries

Sodiophilic Mg2+‐Decorated Ti3C2 MXene for Dendrite‐Free Sodium Metal Batteries with Carbonate‐Based Electrolytes

Multifunctional Electrolyte Additive Stabilizes Electrode–Electrolyte Interface Layers for High-Voltage Lithium Metal Batteries

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Sodiophilic Mg²⁺‐Decorated Ti₃C₂ MXene for Dendrite‐Free Sodium Metal Batteries with Carbonate‐Based Electrolytes