TY - JOUR
T1 - Engineered heat dissipation and current distribution boron nitride-graphene layer coated on polypropylene separator for high performance lithium metal battery
AU - Rodriguez, Jassiel R.
AU - Kim, Patrick J.
AU - Kim, Kyungho
AU - Qi, Zhimin
AU - Wang, Haiyan
AU - Pol, Vilas G.
N1 - Publisher Copyright:
© 2020 Elsevier Inc.
PY - 2021/2/1
Y1 - 2021/2/1
N2 - Li metal as a battery anode has been intensively studied because of its high gravimetric capacity (3860 mAh g−1), a low standard electrode potential (−3.04 vs. SHE), a reasonable electronic conductivity and low density. However, lithium metal suffers from a continuous Li dendrite growth upon charge-discharge cycling, delivering a poor coulombic efficiency and consequently its early failure. Here, engineered bilayer separators demonstrate that a boron nitride-graphene (BNxGry) layer coated on one side of polypropylene (PP) membrane remarkably reduces the polarization and impedance, and significantly improve the performance and stability of Li/Cu half-cells. Moreover, Li/LiFePO4 full cell with the modified BN50Gr50/PP separator presents a remarkably stable 1000 charge-discharge cycles with a specific capacity of 114 mAh g−1 at 1C-rate. The superiority of the modified separator is orginated from an effective synergistic effect between physico-chemical properties of Gr (reducing local current density) and BN (dissipating local heat) and its enhanced structural and mechanical stability.
AB - Li metal as a battery anode has been intensively studied because of its high gravimetric capacity (3860 mAh g−1), a low standard electrode potential (−3.04 vs. SHE), a reasonable electronic conductivity and low density. However, lithium metal suffers from a continuous Li dendrite growth upon charge-discharge cycling, delivering a poor coulombic efficiency and consequently its early failure. Here, engineered bilayer separators demonstrate that a boron nitride-graphene (BNxGry) layer coated on one side of polypropylene (PP) membrane remarkably reduces the polarization and impedance, and significantly improve the performance and stability of Li/Cu half-cells. Moreover, Li/LiFePO4 full cell with the modified BN50Gr50/PP separator presents a remarkably stable 1000 charge-discharge cycles with a specific capacity of 114 mAh g−1 at 1C-rate. The superiority of the modified separator is orginated from an effective synergistic effect between physico-chemical properties of Gr (reducing local current density) and BN (dissipating local heat) and its enhanced structural and mechanical stability.
KW - Bilayer BNGr/PP separator
KW - Li metal battery
KW - Superior performance
KW - Suppression of dendritic Li
KW - Synergistic effect
UR - http://www.scopus.com/inward/record.url?scp=85091770550&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2020.09.009
DO - 10.1016/j.jcis.2020.09.009
M3 - Article
C2 - 33010580
AN - SCOPUS:85091770550
SN - 0021-9797
VL - 583
SP - 362
EP - 370
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -