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Eliminating lithium dendrite relative electrical shorting in rechargeable batteries by coating separator with a Li-killing additive

Abstract

Dendritic electrodeposition is an intrinsic nature of Li metal, and Li dendrite relative electrical shorting is a major cause triggering thermal runaway of the Li metal batteries. In order to eliminate such electrical shorting, a Li-killing layer consisting of TiO2 nanoparticles embedded in a porous Kynar polymer matrix is coated onto one side of the conventional Celgard separator and faced to the cathode. After filling liquid electrolyte, Kynar polymer swells to a gel whereas TiO2 serves as a Li-killer by reacting with the Li dendrites that penetrate through the separator. Additionally, the Li-killing layer increases the thermal dimensional stability of separator, and the wettability, uptake and uphold of liquid electrolyte. It is shown that a Li/Cu cell with the Li-killing layer does not come into electrical shorting even if the Li metal is entirely plated onto the other electrode, whereas the counterpart cell using the pristine separator gets shorting quickly. Moreover, the Li-killing layer increases the rate capability and capacity retention of a Li/LiNi0.80Mn0.10Co0.10O2 cell. Impedance analysis reveals that such improvements are attributed to increased electrolyte uptake and uphold, which comsequently reduces the solid electrolyte interphase resistance and charger-transfer resistance.

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Publication details

The article was received on 27 Mar 2018, accepted on 10 May 2018 and first published on 14 May 2018


Article type: Paper
DOI: 10.1039/C8TA02804D
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Eliminating lithium dendrite relative electrical shorting in rechargeable batteries by coating separator with a Li-killing additive

    S. S. Zhang, X. Fan and C. Wang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02804D

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