Monday, January 17, 2022

Dual strategy with li-ion solvation and solid electrolyte interphase improves stability of lithium metal anode

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Dual strategy for bettering LMA Coulombic effectivity. Credit: ZHU Shengdong

Lithium metal is a perfect anode for high-energy-density rechargeable batteries attributable to its low electrochemical potential and excessive theoretical capability. However, the biking of lithium metal anode (LMA) is proscribed by the uneven Li plating-stripping and unstable solid electrolyte interphase (SEI).

Recently, a analysis group led by Prof. Chen Jian from the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS) developed a dual-strategy with Li-ion and SEI regulation to stabilize anode. Their examine was printed in Energy Storage Materials on Oct. 8.

The researchers used 1,3-dioxolane (DOL) and 1,2-dimethoxyethane (DME) because the solvent, individually mixing with fluorinated ether (TTE), to analyze the impact of the solvents for his or her solvation and electrochemistry in localized excessive focus electrolytes (LHCEs).

They discovered that the weakly solvating functionality of DOL weakened the Li-ion interplay with solvents however improved the coordination functionality with anions. Hence, DOL-TTE shaped a novel solvation construction that differed from DME-TTE blends.

A small quantity of TTE may dramatically reshape the coordination construction of the Li-ion in DOL whereas it couldn’t work in DME. With rising TTE additions in DOL-TTE blends, ionic aggregates grew to become the dominant solvating configuration, facilitating extra anion-derived SEI and dendrites-free morphology.

Moreover, the extremely coordinated Li+ solvation of DOL-TTE (1:2) may restrict the dissolution and loss of LiPSs in Li-SPAN cells, acquiring a excessive Coulombic effectivity of 99.77 % and capability retention of 92 % after 100 cycles.

“This work revealed the solvent effect for positively participating in Li-ion primary solvation sheath and constructing SEI, providing a new possibility for developing LMA electrolytes,” mentioned Prof. Chen.


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More info:
Shengdong Zhu et al, Dual strategy with Li-ion solvation and solid electrolyte interphase for top Coulombic effectivity of lithium metal anode, Energy Storage Materials (2021). DOI: 10.1016/j.ensm.2021.10.007

Citation:
Dual strategy with li-ion solvation and solid electrolyte interphase improves stability of lithium metal anode (2021, December 28)
retrieved 28 December 2021
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