AI Article Synopsis
- - Lithium metal is a promising material for future batteries, but issues like dendrite formation and unstable electrolyte films compromise safety and efficiency.
- - To enhance lithium metal anode performance, researchers use a special poly-(vinyl carbonate) organogel interlayer that increases the availability of lithium nitrate (LiNO) during battery cycles.
- - This method boosts the efficiency and lifespan of lithium batteries, achieving an impressive 98.6% Coulombic efficiency over 300 cycles and a significant energy density in pouch cells while exploring how the salt interacts with the host material affects its performance.
Article Abstract
Lithium metal is an ideal electrode material for future rechargeable batteries. However, dendrite formation and unstable solid electrolyte interphase film lead to safety concerns and poor Coulombic efficiency (CE). LiNO significantly improves the performance of the lithium metal anode in ester electrolytes but its use is restricted by low solubility. To increase the content of LiNO in the cell, a poly-(vinyl carbonate) organogel interlayer containing dissociated LiNO (LNO-PVC) is placed between the cathode and anode. The dissociated LiNO effectively increases the LiNO -release rate and compensates for the LiNO consumed in ester electrolytes during cycling. Via this interlayer, the performance of the lithium metal anode is significantly improved. The average CE of a Li-Cu cell reaches 98.6% at 0.5 mA cm -1 h and 98.5% at 1 mA cm -1 h for 300 cycles. Also, a Li||NCM811 pouch cell with LNO-PVC interlayer can also reach a 400 Wh kg energy density with a cycling life of 65 cycles. This strategy sheds light on the effect of the state of this salt on its release/dissolution kinetics, which is determined by the interactions between the salt and host material.
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| http://dx.doi.org/10.1002/smll.202202349 | DOI Listing |
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