Metal iodides (LiI, MgI2, AlI3, TiI4, and SnI4) potentiality as electrolyte additives for Li−S batteries

Kim, Sollee; Kwon, Yong Hyun; Cho, Kuk Young; Yoon, Sukeun

doi:10.1016/j.electacta.2021.138927

Cited by 20 publications

(12 citation statements)

References 23 publications

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“…To confirm the formation of the LiI and Cu phase, XPS analysis was employed to obtain the phase composition of the protection layer. As demonstrated in Figure i, the two obvious XPS peaks at 619.2 and 630.6 eV in the I 3d spectrum correspond to the LiI. , Meanwhile, the binding energy of the characteristic peaks in the Cu 2p spectrum shifts to a lower energy of 951.3 and 931.5 eV, indicating that Cu + has been reduced to Cu 0 in the mechanical rolling process (Figure j) . Moreover, the transmission electron microscopy (TEM) image was also carried out to study the microstructure of the MCI.…”

Section: Resultsmentioning

confidence: 97%

LiI/Cu Mixed Conductive Interface via the Mechanical Rolling Approach for Stable Lithium Anodes in the Carbonate Electrolyte

Liang

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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The nonuniform ion/charge distribution and slow Li-ion diffusion at the Li metal/electrolyte interface lead to uncontrollable dendrites growth and inferior cycling stability. Herein, a simple mechanical rolling method is introduced to construct a mixed conductive protective layer composed of LiI and Cu on the Li metal surface through the replacement reaction between CuI nanoflake arrays and metallic Li. LiI can promote Li + transportation across the interface, achieving homogeneous Li + flux and suppressing the growth of Li dendrite, while the homogeneously dispersed Cu nanoparticles can offer abundant nucleation sites for Li deposition, resulting in a remarkably homogenized charge distribution. As expected, Li metal with the LiI/Cu protection layer (LiI/Cu@Li) exhibits a significantly prolonged lifespan over 350 h with slight polarization at a deposition capacity of 3 mAh cm −2 in the carbonate electrolyte. Besides, when matched with high mass loading LiFePO 4 cathodes (20 mg cm −2 ), the LiI/Cu@Li anodes exhibit much improved cycle stability and rate performance. Highly scalable preparation processes as well as the impressive electrochemical performances in half cells and full cells indicate the potential application of the LiI/Cu@Li anode.

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Section: Resultsmentioning

confidence: 97%

LiI/Cu Mixed Conductive Interface via the Mechanical Rolling Approach for Stable Lithium Anodes in the Carbonate Electrolyte

Liang

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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“…The commonly used electrolytes in Li−S batteries are DME and DOL due to their high donor numbers of 20 and 18 and low viscosity. 58 Herein, to explore the effectiveness of VS 2 surfaces in suppressing the shuttling effect, interaction energies of soluble LiPS clusters with DME and DOL organic solvents were studied. S 8 , Li 2 S 2 , and Li 2 S molecules were excluded due to their negligible binding energy in the solvent.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Out of the six LiPS species studied, Li 2 S 8 , Li 2 S 6 , and Li 2 S 4 dissolve in organic electrolytes, causing polysulfide shuttling. The commonly used electrolytes in Li–S batteries are DME and DOL due to their high donor numbers of 20 and 18 and low viscosity . Herein, to explore the effectiveness of VS 2 surfaces in suppressing the shuttling effect, interaction energies of soluble LiPS clusters with DME and DOL organic solvents were studied.…”

Section: Resultsmentioning

confidence: 99%

Theoretical Study on the Role of Solvents in Lithium Polysulfide Anchoring on Vanadium Disulfide Facets for Lithium–Sulfur Batteries

et al. 2023

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The shuttle effects by lithium polysulfides (LiPSs) and the sluggish reaction kinetics are crucial obstacles in the commercialization of Li–S batteries. Hence, effectively trapping and promoting the conversion of LiPSs is of prime importance. However, the fundamental kinetics of the electrocatalytic charging and discharging of Li–S batteries have not been sufficiently explored yet. Therefore, by taking VS2 as a model, we conducted a density functional theory-based study to investigate the ability of dominant exposed crystal planes of VS2 to trap LiPSs from leaching into electrolytes and to act as an electrocatalyst to increase the sulfur reduction reaction (SRR) kinetics. To reflect a realistic environment of a battery, the effect of solvents on the electrocatalytic activity was further investigated. Our calculations show that VS2 has moderate binding energy toward LiPSs; therefore, it can effectively inhibit LiPS shuttling and leaching. However, there was no consistent pattern for binding energies under different VS2 facets. Furthermore, VS2 (001) facets exhibit excellent electrocatalytic activity for the SRR and Li2S decomposition reaction compared to other dominant crystal planes, which significantly lowers the energy barriers of LiPS conversion during the charging and discharging process, ensuring high-rate performance and longer cycle life. Beyond the VS2 systems explored in the current study, the same approach can apply to other potential electrocatalysts as a promising pathway to improve the sluggish reaction kinetics of Li–S batteries.

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“…This is because the viscosity of the electrolyte is appropriately increased by polymerization, and Mg ions along with Li ions are deposited on the Li metal surface to form a stable SEI. [98] As evidenced by Wu et al LiI undergoes oxidation at around 3 V vs. Li/Li + generating I * radicals. [99] Such radicals react with DME resulting in the formation of DME(-H) radicals which can polymerize in solution forming comb-branched polyether protective film on the cathode surface.…”

Section: Lithium Metal Anode Protectionmentioning

confidence: 91%

Electrolyte Measures to Prevent Polysulfide Shuttle in Lithium‐Sulfur Batteries

Donato

Ates

Adenusi

et al. 2022

Batteries & Supercaps

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Batteries & Supercaps www.batteries-supercaps.org Review doi.org/10.1002/batt.202200097 Lithium-sulfur (LiÀ S) batteries are recognized as one of the most promising technologies with the potential to become the next-generation batteries. However, to ensure LiÀ S batteries reach commercialization, complex challenges remain, among which the tailoring of an appropriate electrolyte is the most important. This review discusses the role of electrolytes in LiÀ S batteries, focusing on the main issues and solutions for the shuttle mechanism of polysulfides and the instability of the interface with lithium metal. Herein, we present a background on LiÀ S chemistry followed by the state-of-the-art electrolytes highlighting the different strategies undertaken with liquid and solid electrolytes.

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Metal iodides (LiI, MgI2, AlI3, TiI4, and SnI4) potentiality as electrolyte additives for Li−S batteries

Cited by 20 publications

References 23 publications

LiI/Cu Mixed Conductive Interface via the Mechanical Rolling Approach for Stable Lithium Anodes in the Carbonate Electrolyte

LiI/Cu Mixed Conductive Interface via the Mechanical Rolling Approach for Stable Lithium Anodes in the Carbonate Electrolyte

Theoretical Study on the Role of Solvents in Lithium Polysulfide Anchoring on Vanadium Disulfide Facets for Lithium–Sulfur Batteries

Electrolyte Measures to Prevent Polysulfide Shuttle in Lithium‐Sulfur Batteries

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