Aluminum foil is a typical cathode collector in lithium‐ion batteries, it encounters various issues, including restricted contact with the active substance, poor adhesion, and regional corrosion associated with the electrolyte. Although conventional carbon‐coated aluminum foils partially alleviate such problems, they suffer from excess weight and thickness of their carbon layers. Here a simple casting method to prepare Ketjen Black/aqueous graphene dispersion slurry modified aluminum foil (KB‐AGD‐Al‐CCs) and graphene micro‐sheets/aqueous graphene dispersion slurry modified aluminum foil (GM‐AGD‐Al‐CCs). Our results indicate that batteries utilizing graphene‐modified aluminum foils exhibited superior electrochemical performance compared with that of carbon‐coated aluminum foils. The lithium‐ion battery employing GM‐AGD‐Al‐CCs as cathode current collectors exhibits reversible specific capacities of 155, 118, and 92.5 mAh/g at current densities of 0.1, 5, and 10 C. After cycling for 1800 cycles at 5 and 10 C, its specific capacities remain at 91 and 77.5 mAh/g. Combing contact angle measurement, electrical conductivity test with electrochemical impedance spectroscopy indicates that the graphene coating decreases the contact angle between the commercial LiFePO4 and current collector, increases the electrical conductivity of the electrode and adhesion. Moreover, the inclusion of GM and KB as conductive additives compensates for graphene's low interlayer conductivity by forming a conductive network.

中文翻译：

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具有增强机械和电化学性能的锂离子电池复合石墨烯改性铝箔正极集流体

铝箔是锂离子电池中典型的正极集流体，它遇到各种问题，包括与活性物质接触受限、附着力差以及与电解液相关的区域腐蚀。尽管传统的碳涂层铝箔可以部分缓解此类问题，但它们的碳层重量和厚度都过大。这里采用简单的铸造方法制备科琴黑/水性石墨烯分散浆料改性铝箔（KB-AGD-Al-CCs）和石墨烯微片/水性石墨烯分散浆料改性铝箔（GM-AGD-Al-CCs）。我们的结果表明，与碳涂层铝箔相比，使用石墨烯改性铝箔的电池表现出更优异的电化学性能。采用GM-AGD-Al-CC作为正极集流体的锂离子电池在0.1、5和10 C的电流密度下表现出155、118和92.5 mAh/g的可逆比容量。在5℃下循环1800次后和10C时，其比容量保持在91和77.5mAh/g。结合接触角测量、电导率测试和电化学阻抗谱表明，石墨烯涂层降低了商用LiFePO4与集流体之间的接触角，增加了电极的电导率和附着力。此外，GM和KB作为导电添加剂的加入通过形成导电网络来补偿石墨烯的低层间导电率。