Stabilizing Polyether Electrolyte with a 4 v Metal Oxide Cathode by Nanoscale Interfacial Coating

Haowei Zhai; Tianyao Gong; Bingqing Xu; Qian Cheng; Daniel Paley; Boyu Qie; Tianwei Jin; Zhenxuan Fu; Laiyuan Tan; Yuan Hua Lin; Ce Wen Nan; Yuan Yang

doi:10.1021/acsami.9b04932

Stabilizing Polyether Electrolyte with a 4 v Metal Oxide Cathode by Nanoscale Interfacial Coating

Haowei Zhai, Tianyao Gong, Bingqing Xu, Qian Cheng, Daniel Paley, Boyu Qie, Tianwei Jin, Zhenxuan Fu, Laiyuan Tan, Yuan Hua Lin, Ce Wen Nan, Yuan Yang^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

Safety is critical to developing next-generation batteries with high-energy density. Polyether-based electrolytes, such as poly(ethylene oxide) and poly(ethylene glycol) (PEG), are attractive alternatives to the current flammable liquid organic electrolyte, since they are much more thermally stable and compatible with high-capacity lithium anode. Unfortunately, they are not stable with 4 V Li(Ni_xMn_yCo_1-x-y)O₂ (NMC) cathodes, hindering them from application in batteries with high-energy density. Here, we report that the compatibility between PEG electrolyte and NMC cathodes can be significantly improved by forming a 2 nm Al₂O₃ coating on the NMC surface. This nanoscale coating dramatically changes the composition of the cathode electrolyte interphase and thus stabilizes the PEG electrolyte with the NMC cathode. With Al₂O₃, the capacity remains at 84.7% after 80 cycles and 70.3% after 180 cycles. In contrast, the capacity fades to less than 50% after only 20 cycles in bare NMC electrodes. This study opens a new opportunity to develop safe electrolyte for lithium batteries with high-energy density.

Original language	English
Pages (from-to)	28774-28780
Number of pages	7
Journal	ACS applied materials & interfaces
Volume	11
Issue number	32
DOIs	https://doi.org/10.1021/acsami.9b04932
Publication status	Published - 14 Aug 2019
Externally published	Yes

Keywords

NMC cathode
atomic layer deposition
battery safety
lithium anode
poly(ethylene oxide)
polymer electrolyte
thermal runaway

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10.1021/acsami.9b04932

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title = "Stabilizing Polyether Electrolyte with a 4 v Metal Oxide Cathode by Nanoscale Interfacial Coating",

abstract = "Safety is critical to developing next-generation batteries with high-energy density. Polyether-based electrolytes, such as poly(ethylene oxide) and poly(ethylene glycol) (PEG), are attractive alternatives to the current flammable liquid organic electrolyte, since they are much more thermally stable and compatible with high-capacity lithium anode. Unfortunately, they are not stable with 4 V Li(NixMnyCo1-x-y)O2 (NMC) cathodes, hindering them from application in batteries with high-energy density. Here, we report that the compatibility between PEG electrolyte and NMC cathodes can be significantly improved by forming a 2 nm Al2O3 coating on the NMC surface. This nanoscale coating dramatically changes the composition of the cathode electrolyte interphase and thus stabilizes the PEG electrolyte with the NMC cathode. With Al2O3, the capacity remains at 84.7% after 80 cycles and 70.3% after 180 cycles. In contrast, the capacity fades to less than 50% after only 20 cycles in bare NMC electrodes. This study opens a new opportunity to develop safe electrolyte for lithium batteries with high-energy density.",

keywords = "NMC cathode, atomic layer deposition, battery safety, lithium anode, poly(ethylene oxide), polymer electrolyte, thermal runaway",

author = "Haowei Zhai and Tianyao Gong and Bingqing Xu and Qian Cheng and Daniel Paley and Boyu Qie and Tianwei Jin and Zhenxuan Fu and Laiyuan Tan and Lin, {Yuan Hua} and Nan, {Ce Wen} and Yuan Yang",

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doi = "10.1021/acsami.9b04932",

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T1 - Stabilizing Polyether Electrolyte with a 4 v Metal Oxide Cathode by Nanoscale Interfacial Coating

AU - Zhai, Haowei

AU - Gong, Tianyao

AU - Xu, Bingqing

AU - Cheng, Qian

AU - Paley, Daniel

AU - Qie, Boyu

AU - Jin, Tianwei

AU - Fu, Zhenxuan

AU - Tan, Laiyuan

AU - Lin, Yuan Hua

AU - Nan, Ce Wen

AU - Yang, Yuan

PY - 2019/8/14

Y1 - 2019/8/14

N2 - Safety is critical to developing next-generation batteries with high-energy density. Polyether-based electrolytes, such as poly(ethylene oxide) and poly(ethylene glycol) (PEG), are attractive alternatives to the current flammable liquid organic electrolyte, since they are much more thermally stable and compatible with high-capacity lithium anode. Unfortunately, they are not stable with 4 V Li(NixMnyCo1-x-y)O2 (NMC) cathodes, hindering them from application in batteries with high-energy density. Here, we report that the compatibility between PEG electrolyte and NMC cathodes can be significantly improved by forming a 2 nm Al2O3 coating on the NMC surface. This nanoscale coating dramatically changes the composition of the cathode electrolyte interphase and thus stabilizes the PEG electrolyte with the NMC cathode. With Al2O3, the capacity remains at 84.7% after 80 cycles and 70.3% after 180 cycles. In contrast, the capacity fades to less than 50% after only 20 cycles in bare NMC electrodes. This study opens a new opportunity to develop safe electrolyte for lithium batteries with high-energy density.

AB - Safety is critical to developing next-generation batteries with high-energy density. Polyether-based electrolytes, such as poly(ethylene oxide) and poly(ethylene glycol) (PEG), are attractive alternatives to the current flammable liquid organic electrolyte, since they are much more thermally stable and compatible with high-capacity lithium anode. Unfortunately, they are not stable with 4 V Li(NixMnyCo1-x-y)O2 (NMC) cathodes, hindering them from application in batteries with high-energy density. Here, we report that the compatibility between PEG electrolyte and NMC cathodes can be significantly improved by forming a 2 nm Al2O3 coating on the NMC surface. This nanoscale coating dramatically changes the composition of the cathode electrolyte interphase and thus stabilizes the PEG electrolyte with the NMC cathode. With Al2O3, the capacity remains at 84.7% after 80 cycles and 70.3% after 180 cycles. In contrast, the capacity fades to less than 50% after only 20 cycles in bare NMC electrodes. This study opens a new opportunity to develop safe electrolyte for lithium batteries with high-energy density.

KW - NMC cathode

KW - atomic layer deposition

KW - battery safety

KW - lithium anode

KW - poly(ethylene oxide)

KW - polymer electrolyte

KW - thermal runaway

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Stabilizing Polyether Electrolyte with a 4 v Metal Oxide Cathode by Nanoscale Interfacial Coating

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