The aluminum current collector with honeycomb-like surface and thick Al 2 O 3 film increased durability and enhanced saf
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The aluminum current collector with honeycomb-like surface and thick Al2O3 film increased durability and enhanced safety for lithium-ion batteries Linjuan Cao1 · Linlin Li1 · Zhao Xue2 · Wei Yang1 · Hanbo Zou1 · Shengzhou Chen3 · Zili Liu3
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Durability and safety are main factors contributing to the market requirement of lithium-ion batteries (LIBs) in practical applications. The improvement of current collector has been proven as an effective approach to enhance comprehensive performance of LIBs. To achieve a sufficient electrical contact between the current collector and active materials, honeycomblike surface of aluminum current collector is etched by direct current in sulfuric acid and phosphoric acid mixed solution. At the same time, a dense anodic aluminum oxide film is formed on the surface of aluminum current collector, which can protect LIBs from corrosion and thermal runaway. Experimental results show that the adhesion between the active material and aluminum current collector was improved by 23% after anodization. The corrosion resistance of alumina foil was promoted significantly in ethyl methyl carbonate and ethylene carbonate electrolyte with LiPF6. The corrosion current peak reduces to 0.022 mA/cm2 from 0.267 mA/cm2 after surface treatment. The capacity retention rate of the LiCoO2 electrode with an oxidation-treated aluminum current collector is 6.3% higher than with untreated aluminum foil at 5C after 500 cycles. What’s more, the nail penetration demonstrates that the aluminum current collector we prepared can reduce the temperature of the full batteries surface when the nail pierced, which improved the safety performance of LIBs. Keywords Aluminum current collector · Surface treatment · Alumina film · Safety
1 Introduction Lithium-ion batteries (LIBs) mainly provide energy for portable electronics, electric vehicles and hybrid vehicles, because of their high energy density, long cycle life [1–3]. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10934-020-00942-9) contains supplementary material, which is available to authorized users. * Wei Yang [email protected] * Shengzhou Chen [email protected] 1
School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, Guangdong, China
2
Dongguan LIWINON Energy Technology Co., Ltd, Dong guan 523000, Guangdong, China
3
Guangzhou Key Laboratory for New Energy and Green Catalysis, Guangzhou University, Guangzhou 510006, Guangdong, China
However, the rapid increase of these highly functionalized applications strongly demands higher energy and power densities and expressive charge-discharge cycling performance of the battery device [4–6]. Besides, the safety performance remains as the main focus for LIBs manufacturers in addition to cost and durability [7–10]. Aluminum foil is typically used as a current collector material for cathode electrodes in commercial LIBs, because it meets most pr
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