Abstract
The adhesion between electrode and separator is a key feature in cell assembly. Nafion™-coated separators for water-processed LiNi0.5Mn1.5O4 (LNMO) electrodes are here proposed as an alternative to the polyolefin separators. Specifically, polyolefin separators are modified with Nafion™ solutions and their adhesion to high-potential LNMO electrodes is investigated. The physicochemical properties of the Nafion™-coated separator and its electrochemical performance in Li/LNMO cells are discussed and compared to those obtained with polyolefin Celgard® (Charlotte, NC, USA) PP2075 separator. Improved adhesion and cycling stability, which could be further enhanced by a mild lamination process, were demonstrated with a thin layer of Nafion™ (0.1 mg cm−2).
Highlights
IntroductionPerformance, safety and environmental impact must be taken into account
In the continuous search for increasing and optimizing lithium-ion and lithium batteries’performance, safety and environmental impact must be taken into account
The modified separators were prepared starting from a commercial polyolefin separator (C2075)
Summary
Performance, safety and environmental impact must be taken into account. Both aspects involve the materials and the fabrication processes [1,2]. The binder is one of the battery key components that greatly affects the environmental impact of electrode manufacturing. It is present in low quantities, the binder is fundamental for the cycle life of the cell because it keeps the cohesion of the electrode components over cycling and maintains contact between the electrode and the current collector. With the aim to reduce environmental impact and production costs, water-processable binders, such as carboxymethylcellulose, polyacrylate, and sodium alginate, are a viable choice [3,4,5]
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