Janus behaviour of LiFSI- and LiPF₆-based electrolytes for Li metal batteries: chemical corrosion versus galvanic corrosion

Abstract

Li metal has been considered a promising anode for high energy density Li batteries because of the lowest redox potential and high specific capacity of the Li/Li+ redox couple. However,...

Optimized Cycle and Safety Performance of Lithium–Metal Batteries with the Sustained‐Release Effect of Nano CaCO3

“…the cycling of the Li metal anode, it is difficult for the conventional electrolyte to form stable and homogeneous solid electrolyte interphase (SEI) layer on the electrode to protect the interface, and the consequent incomplete SEI will further induce the growth of Li dendrites and finally cause cell failure. [7,8] Poor recyclability and serious safety problems have greatly hindered the commercialization of LMBs.…”

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the cycling of the Li metal anode, it is difficult for the conventional electrolyte to form stable and homogeneous solid electrolyte interphase (SEI) layer on the electrode to protect the interface, and the consequent incomplete SEI will further induce the growth of Li dendrites and finally cause cell failure. [7,8] Poor recyclability and serious safety problems have greatly hindered the commercialization of LMBs.So far, tremendous efforts have been invested to inhibit the growth of Li dendrites and boost the Coulombic efficiency (CE) of LMB, multiple methods such as constructing artificial SEI, [9] using 3D porous current collectors, [10] modifying separators, [11,12] optimizing electrolyte composition and forming Li-based alloys have been adopted. [13][14][15] From the perspective of commercialization potential, electrochemical performance, and environmental protection, adding the appropriate amount of additives to commercial carbonate electrolytes is undoubtedly the most advantageous way to optimize the performance of LMBs.

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Corrosion and Materials Degradation in Electrochemical Energy Storage and Conversion Devices

“…Other reports on corrosion in batteries include Li-metal corrosion in Li-metal batteries, [300,[368][369][370] galvanic corrosion in lithium-powder electrodes, [229] and different corrosion issues relevant to vanadium redox flow batteries, [371][372][373][374][375] seawateractivated batteries, [376][377][378][379] Zn/MnO 2 , [380,381] Zn/LiMn 2 O 4 , [382] and Na-Se [383] batteries and others. [384][385][386]…”

Dissolution of the Solid Electrolyte Interphase and Its Effects on Lithium Metal Anode Cyclability

“…Recently, Kwon et al utilized the electrochemical quartz crystal microbalance (EQCM)a technique that can measure mass changes in the ng cm –2 scaleto quantify SEI mass loss during resting at open circuit after its formation in situ . They illustrated that over half of the SEI mass is loss during rest, demonstrating the potential of EQCM as a technique to accurately quantify SEI dissolution . Moreover, mass loss during dissolution would be a reliable metric to compare SEI solubility, as the measurement considers solute (SEI)–solvent (electrolyte) interactions as a whole.…”