Effects of Molecular Weight on the Electrochemical Properties of Poly(vinylidene difluoride)-Based Polymer Electrolytes

Ying LIANG; Shundong GUAN; Chengzhou XIN; Kaihua WEN; Chuanjiao XUE; Hetian CHEN; Sijie LIU; Xinbin WU; Haocheng YUAN; Liangliang LI; Ce-Wen NAN

doi:10.1021/acsami.2c07471

Effects of Molecular Weight on the Electrochemical Properties of Poly(vinylidene difluoride)-Based Polymer Electrolytes

Ying LIANG, Shundong GUAN, Chengzhou XIN, Kaihua WEN, Chuanjiao XUE, Hetian CHEN, Sijie LIU, Xinbin WU, Haocheng YUAN, Liangliang LI^*, Ce-Wen NAN^*

^*Corresponding author for this work

Research output: Journal Publications › Journal Article (refereed) › peer-review

20 Citations (Scopus)

Abstract

Polymer-based electrolytes have attracted ever-increasing attention for solid-state batteries due to their excellent flexibility and processability. Among them, poly(vinylidene difluoride) (PVDF)-based electrolytes with high ionic conductivity, wide electrochemical stability window, and good mechanical properties show great potential and have been widely investigated by using different Li salts, solvents, and inorganic fillers. Here, we report the influence of the molecular weight of PVDF itself on the electrochemical properties of the electrolytes by using two kinds of common PVDF polymers, i.e., PVDF 761 and 5130. Our results demonstrate that the electrolyte with a larger molecular weight (PVDF 5130) has a denser structure and lower crystallinity, and thus much better electrochemical performance, than one with a smaller molecular weight (PVDF 761). With PVDF 5130, the LiFePO4-based solid-state cells present a steady cycling performance with a capacity retention of 85% after 1000 cycles at 1 C and 30 °C. The cycle life of the LiCoO2-based solid-state cells is also extended by using PVDF 5130.

Original language	English
Pages (from-to)	32075-32083
Number of pages	9
Journal	ACS applied materials & interfaces
Volume	14
Issue number	28
Early online date	5 Jul 2022
DOIs	https://doi.org/10.1021/acsami.2c07471
Publication status	Published - 20 Jul 2022
Externally published	Yes

Bibliographical note

This work was supported by the National Natural Science Foundation of China under Grants 51788104 and U21A2080.

Keywords

lithium metal
molecular weight
poly(vinylidene difluoride)
polymer electrolyte
solid-state battery

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10.1021/acsami.2c07471

Cite this

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title = "Effects of Molecular Weight on the Electrochemical Properties of Poly(vinylidene difluoride)-Based Polymer Electrolytes",

abstract = "Polymer-based electrolytes have attracted ever-increasing attention for solid-state batteries due to their excellent flexibility and processability. Among them, poly(vinylidene difluoride) (PVDF)-based electrolytes with high ionic conductivity, wide electrochemical stability window, and good mechanical properties show great potential and have been widely investigated by using different Li salts, solvents, and inorganic fillers. Here, we report the influence of the molecular weight of PVDF itself on the electrochemical properties of the electrolytes by using two kinds of common PVDF polymers, i.e., PVDF 761 and 5130. Our results demonstrate that the electrolyte with a larger molecular weight (PVDF 5130) has a denser structure and lower crystallinity, and thus much better electrochemical performance, than one with a smaller molecular weight (PVDF 761). With PVDF 5130, the LiFePO4-based solid-state cells present a steady cycling performance with a capacity retention of 85% after 1000 cycles at 1 C and 30 °C. The cycle life of the LiCoO2-based solid-state cells is also extended by using PVDF 5130.",

keywords = "lithium metal, molecular weight, poly(vinylidene difluoride), polymer electrolyte, solid-state battery",

author = "Ying LIANG and Shundong GUAN and Chengzhou XIN and Kaihua WEN and Chuanjiao XUE and Hetian CHEN and Sijie LIU and Xinbin WU and Haocheng YUAN and Liangliang LI and Ce-Wen NAN",

note = "This work was supported by the National Natural Science Foundation of China under Grants 51788104 and U21A2080.",

year = "2022",

month = jul,

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doi = "10.1021/acsami.2c07471",

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journal = "ACS applied materials & interfaces",

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TY - JOUR

T1 - Effects of Molecular Weight on the Electrochemical Properties of Poly(vinylidene difluoride)-Based Polymer Electrolytes

AU - LIANG, Ying

AU - GUAN, Shundong

AU - XIN, Chengzhou

AU - WEN, Kaihua

AU - XUE, Chuanjiao

AU - CHEN, Hetian

AU - LIU, Sijie

AU - WU, Xinbin

AU - YUAN, Haocheng

AU - LI, Liangliang

AU - NAN, Ce-Wen

N1 - This work was supported by the National Natural Science Foundation of China under Grants 51788104 and U21A2080.

PY - 2022/7/20

Y1 - 2022/7/20

N2 - Polymer-based electrolytes have attracted ever-increasing attention for solid-state batteries due to their excellent flexibility and processability. Among them, poly(vinylidene difluoride) (PVDF)-based electrolytes with high ionic conductivity, wide electrochemical stability window, and good mechanical properties show great potential and have been widely investigated by using different Li salts, solvents, and inorganic fillers. Here, we report the influence of the molecular weight of PVDF itself on the electrochemical properties of the electrolytes by using two kinds of common PVDF polymers, i.e., PVDF 761 and 5130. Our results demonstrate that the electrolyte with a larger molecular weight (PVDF 5130) has a denser structure and lower crystallinity, and thus much better electrochemical performance, than one with a smaller molecular weight (PVDF 761). With PVDF 5130, the LiFePO4-based solid-state cells present a steady cycling performance with a capacity retention of 85% after 1000 cycles at 1 C and 30 °C. The cycle life of the LiCoO2-based solid-state cells is also extended by using PVDF 5130.

AB - Polymer-based electrolytes have attracted ever-increasing attention for solid-state batteries due to their excellent flexibility and processability. Among them, poly(vinylidene difluoride) (PVDF)-based electrolytes with high ionic conductivity, wide electrochemical stability window, and good mechanical properties show great potential and have been widely investigated by using different Li salts, solvents, and inorganic fillers. Here, we report the influence of the molecular weight of PVDF itself on the electrochemical properties of the electrolytes by using two kinds of common PVDF polymers, i.e., PVDF 761 and 5130. Our results demonstrate that the electrolyte with a larger molecular weight (PVDF 5130) has a denser structure and lower crystallinity, and thus much better electrochemical performance, than one with a smaller molecular weight (PVDF 761). With PVDF 5130, the LiFePO4-based solid-state cells present a steady cycling performance with a capacity retention of 85% after 1000 cycles at 1 C and 30 °C. The cycle life of the LiCoO2-based solid-state cells is also extended by using PVDF 5130.

KW - lithium metal

KW - molecular weight

KW - poly(vinylidene difluoride)

KW - polymer electrolyte

KW - solid-state battery

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U2 - 10.1021/acsami.2c07471

DO - 10.1021/acsami.2c07471

M3 - Journal Article (refereed)

AN - SCOPUS:85134854529

SN - 1944-8244

VL - 14

SP - 32075

EP - 32083

JO - ACS applied materials & interfaces

JF - ACS applied materials & interfaces

IS - 28

ER -

Effects of Molecular Weight on the Electrochemical Properties of Poly(vinylidene difluoride)-Based Polymer Electrolytes

Abstract

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Keywords

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