2024-08-29 スウォンジー大学
＜関連情報＞
- https://www.swansea.ac.uk/press-office/news-events/news/2024/08/researchers-unveil-scalable-graphene-technology-to-revolutionise-battery-safety-and-performance.php
- https://www.nature.com/articles/s44286-024-00103-8
熱伝達を調整しバッテリーの安全性を高める大規模集電体 Large-scale current collectors for regulating heat transfer and enhancing battery safety
Lun Li,Jinlong Yang,Rui Tan,Wei Shu,CheeTong John Low,Zixin Zhang,Yu Zhao,Cheng Li,Yajun Zhang,Xingchuan Li,Huazhang Zhang,Xin Zhao,Zongkui Kou,Yong Xiao,Francis Verpoort,Hewu Wang,Liqiang Mai & Daping He
Nature Chemical Engineering Published:DOI:https://doi.org/10.1038/s44286-024-00103-8
Abstract
Thermal runaway, a major battery safety issue, is triggered when the local temperature exceeds a threshold value resulting from slower heat dissipation relative to heat generation inside the cell. However, improving internal heat transfer is challenged by the low thermal conductivity of metal current collectors (CCs) and challenges in manufacturing nonmetal CC foils at large scales. Here we report a rapid temperature-responsive nonmetallic CC that can substitute benchmark Al and Cu foils to enhance battery safety. The nonmetallic CC was fabricated through a continuous thermal pressing process to afford a highly oriented Gr foil on a hundred-meter scale. This Gr foil demonstrates a high thermal conductivity of 1,400.8 W m−1 K−1, about one order of magnitude higher than those of Al and Cu foils. Importantly, LiNi0.8Co0.1Mn0.1O2||graphite cells integrated with these temperature-responsive foils show faster heat dissipation, eliminating the local heat concentration and circumventing the fast exothermic aluminothermic and hydrogen-evolution reactions, which are critical factors causing the thermal failure propagation of lithium-ion battery packs.
