Cyclic carbonate for highly stable cycling of high voltage lithium metal batteries

Su, Chi‐Cheung; He, Meinan; Amine, Rachid; Chen, Zonghai; Sahore, Ritu; Rago, Nancy Dietz; Amine, Khalil

doi:10.1016/j.ensm.2018.11.003

Cited by 151 publications

(118 citation statements)

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“…[9,[17][18][19][20][21][22] Generally, the LIB electrolyte system contains a lithium salt, a linear carbonate, and a cyclic carbonate (Figure S1). [23][24][25][26][27] Lithium hexafluorophosphate (LiPF 6 ) is used extensively as the lithium salt because it provides lithium cations and is excellent in passivating the aluminum current collector, which is an indispensable component of the cell. [23,27] A linear carbonate such as dimethyl carbonate (DMC) or ethyl methyl carbonate (EMC) is considered as a "thinning" solvent, which not only significantly reduces the viscosity of the electrolyte, but also increases its wettability towards other cell components.…”

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confidence: 99%

“…Its sacrificial decomposition forms a robust interphase on the anode surface, thus enabling stable battery cycling. [23,27,30] Although ethylene carbonate (EC) is widely used as the cyclic carbonate for the graphite anode, it does not form a stable SEI on a lithium anode, and this disqualifies it for use in LMBs. [27,31,32] By contrast, fluorinated cyclic carbonates such as fluoroethylene carbonate (FEC) and difluoroethylene carbonate (DFEC) are effective in forming a benign and robust SEI on the lithium surface.…”

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confidence: 99%

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Solvation Rule for Solid‐Electrolyte Interphase Enabler in Lithium‐Metal Batteries

Shi

et al. 2020

Angewandte Chemie

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Despite the exceptionally high energy density of lithium metal anodes, the practical application of lithium‐metal batteries (LMBs) is still impeded by the instability of the interphase between the lithium metal and the electrolyte. To formulate a functional electrolyte system that can stabilize the lithium‐metal anode, the solvation behavior of the solvent molecules must be understood because the electrochemical properties of a solvent can be heavily influenced by its solvation status. We unambiguously demonstrated the solvation rule for the solid‐electrolyte interphase (SEI) enabler in an electrolyte system. In this study, fluoroethylene carbonate was used as the SEI enabler due to its ability to form a robust SEI on the lithium metal surface, allowing relatively stable LMB cycling. The results revealed that the solvation number of fluoroethylene carbonate must be ≥1 to ensure the formation of a stable SEI in which the sacrificial reduction of the SEI enabler subsequently leads to the stable cycling of LMBs.

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confidence: 99%

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Solvation Rule for Solid‐Electrolyte Interphase Enabler in Lithium‐Metal Batteries

Shi

et al. 2020

Angewandte Chemie

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“…[204][205][206][207] Recently, many research studies have used FEC as an electrolyte additive on Li metal anodes for enhancing the high round efficiency and capacity retention due to the LiF formed from the decomposition of FEC. [40,[208][209][210][211][212] Among the recently reported studies in the literature, Yan et al presented a new approach via a chemical reaction between FEC and a Li metal surface, as shown in Figure 11c, with the aim of facilitating the formation of a dual-layered film divided into an inorganic part at the bottom with an organic part on the top. [213] When the Li metal anode is immersed in only an FEC solution, first the F anions detached as a result of the reduction of FEC due to weak bonding between C and F, and combined with Li to form LiÀ F bonds.…”

Section: Artificial Layers Driven By Electrolyte Component Decompositionmentioning

confidence: 99%

Lithium Metal Interface Modification for High‐Energy Batteries: Approaches and Characterization

Lee

Song

Cho

et al. 2020

Batteries & Supercaps

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Rechargeable batteries have been a profoundly greater part of our lives than we could have ever imagined. The rechargeable Li‐ion batteries (LIBs) that have been developed for transport systems even put fossil fuels in the corner. However, state‐of‐the‐art Li‐ion batteries with graphite anodes are now approaching their theoretical specific energy limits, so they cannot meet the increasing demands of a range of portable electronics and large‐scale energy storage systems. Li metal is one of the most promising anode materials that could break through the energy density bottleneck of Li‐ion batteries due to its ultrahigh specific capacity and very low potential compared to other anode materials. Nonetheless, the direct use of Li metal in commercial battery systems has been hindered due to significant obstacles associated with it such as safety issues, corrosion from chemical reactions that occur inside the battery, or poor cycling performance. The fundamental reason for these problems is the dendritic growth of Li‐ions on the Li metal anode during cycling, as a result of the interfacial phenomena of Li metal and electrolytes. Modification of the Li metal interface with an electrolyte presents an efficient solution to solve these problems. In this review, the current challenges facing the development of Li metal anodes are presented in detail. The most recent advances in Li metal anodes using a controlled interface between the Li metal surface and an electrolyte are highlighted and an introduction on the synthesis and production methods for the application of high‐energy‐density battery systems such as Li‐oxygen (Li−O2), Li‐sulfur (Li−S), and Li metal batteries with high‐energy density cathodes is presented. Furthermore, the recent developments in the in situ/operando analysis tools adopted for the investigation of Li metal anodes such as the structural and chemical changes, dynamic properties, and solid–electrolyte interface (SEI) layer properties are described and summarized. Finally, some suggestions are given in the direction of the development of Li metal with artificial surface layers for use in future high‐energy batteries.

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“…The continuous decomposition of functional additives during repeated cycling and the resulting decrease of their efficiency for prolonging cycling lifetime highlight the need to reformulate electrolytes with different Li salts or solvents. [ 55,151,165–170 ] Yoon et al used a lithium bis(trifluoromethanesulfonyl)imide(LiTFSI)/lithium bis(oxalate)borate(LiBOB) dual salt and LiPF 6 as an additive to more efficiently control undesired Li deposition (Figure 8d). [ 171 ] The above salt played a critical role in anode passivation via simultaneous formation of flexible polycarbonate and rigid Li 2 O components upon SEI development.…”

Section: Use Of LI Metal Powder and Micropatterning To Increase Surfamentioning

confidence: 99%

Structure‐Controlled Li Metal Electrodes for Post‐Li‐Ion Batteries: Recent Progress and Perspectives

Jin

Park

Ryou

et al. 2020

Adv Materials Inter

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more batteries, this approach fails to exceed the threshold of 500 km in view of the limited battery mounting space in EVs and the almost saturated energy density of state-of-the-art LIBs (Figure 1a).As demonstrated in the road map for the development of the eGolf (an EV from Volkswagen), a driving range of 420 km can be achieved by 2020 based on the currently available LIB chemistry, cell design techniques, and vehicle frame lightening.

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Cyclic carbonate for highly stable cycling of high voltage lithium metal batteries

Cited by 151 publications

References 56 publications

Solvation Rule for Solid‐Electrolyte Interphase Enabler in Lithium‐Metal Batteries

Solvation Rule for Solid‐Electrolyte Interphase Enabler in Lithium‐Metal Batteries

Lithium Metal Interface Modification for High‐Energy Batteries: Approaches and Characterization

Structure‐Controlled Li Metal Electrodes for Post‐Li‐Ion Batteries: Recent Progress and Perspectives

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