A Thermal-Ball-Valve Structure Separator for Highly Safe Lithium-Ion Batteries
© 2023 Wiley-VCH GmbH..
The separator located between the positive and negative electrodes not only provides a lithium-ion transmission channel but also prevents short circuits for direct contact of electrodes. The inferior dimension thermostability of commercial polyolefin separators intensifies the thermal runaway of batteries under abuse such as short circuits, overcharge, and so on. a polyvinylidene fluoride/polyether imide (PVDF/PEI) separator with high thermal stability in which the high thermostable PEI microspheres are evenly dispersed in the PVDF film matrix and also located in the micro holes of the PVDF film is developed. They not only function as strong skeleton that enables the rare shrink of the separator at 200 °C avoiding short circuit but also act as ball valve that blocks the lithium ion transmission channel at 150 °C interrupting the further heat aggregation. Thus, the LiNi0.6 Co0.2 Mn0.2 O2 /Li batteries exhibit high cycle stability of 96.5% capacity retention after 100 cycles at 0.2C and 80°C. Further, the LiNi0.6 Co0.2 Mn0.2 O2 /graphite pouch cells are constructed and deliver good safety performance without smoke release and catching fire after the nail penetration test.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2023 |
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| Erschienen: |
2023 |
| Enthalten in: |
Zur Gesamtaufnahme - year:2023 |
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| Enthalten in: |
Small (Weinheim an der Bergstrasse, Germany) - (2023) vom: 10. Dez., Seite e2309523 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Zhang, Xueqian [VerfasserIn] |
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| Links: |
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| Themen: |
Dimensional thermostability |
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| Anmerkungen: |
Date Revised 10.12.2023 published: Print-Electronic Citation Status Publisher |
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| doi: |
10.1002/smll.202309523 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM365634352 |
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| 500 | |a Date Revised 10.12.2023 | ||
| 500 | |a published: Print-Electronic | ||
| 500 | |a Citation Status Publisher | ||
| 520 | |a © 2023 Wiley-VCH GmbH. | ||
| 520 | |a The separator located between the positive and negative electrodes not only provides a lithium-ion transmission channel but also prevents short circuits for direct contact of electrodes. The inferior dimension thermostability of commercial polyolefin separators intensifies the thermal runaway of batteries under abuse such as short circuits, overcharge, and so on. a polyvinylidene fluoride/polyether imide (PVDF/PEI) separator with high thermal stability in which the high thermostable PEI microspheres are evenly dispersed in the PVDF film matrix and also located in the micro holes of the PVDF film is developed. They not only function as strong skeleton that enables the rare shrink of the separator at 200 °C avoiding short circuit but also act as ball valve that blocks the lithium ion transmission channel at 150 °C interrupting the further heat aggregation. Thus, the LiNi0.6 Co0.2 Mn0.2 O2 /Li batteries exhibit high cycle stability of 96.5% capacity retention after 100 cycles at 0.2C and 80°C. Further, the LiNi0.6 Co0.2 Mn0.2 O2 /graphite pouch cells are constructed and deliver good safety performance without smoke release and catching fire after the nail penetration test | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a dimensional thermostability | |
| 650 | 4 | |a lithium ion battery | |
| 650 | 4 | |a polyvinylidene fluoride film | |
| 650 | 4 | |a separator | |
| 700 | 1 | |a Zhang, Xueqian |e verfasserin |4 aut | |
| 700 | 1 | |a Wang, Sen |e verfasserin |4 aut | |
| 700 | 1 | |a Ye, Jiajia |e verfasserin |4 aut | |
| 700 | 1 | |a Zhao, Ya |e verfasserin |4 aut | |
| 700 | 1 | |a Yang, Ziqiang |e verfasserin |4 aut | |
| 700 | 1 | |a Cui, Shishuang |e verfasserin |4 aut | |
| 700 | 1 | |a Hou, Zhiguo |e verfasserin |4 aut | |
| 700 | 1 | |a Yang, Bin |e verfasserin |4 aut | |
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