Climate change is part of today's most complex global challenges. Social efforts to achieve sustainable and CO 2 -neutral ways to provide mobility as well as for electrical energy production, induce ambitious challenges to energy storage. In the field of rechargeable batteries, the lithium-ion-battery (LIB) is today's most promising approach, to match all energy storage requirements of electric vehicles (mobile energy storage) as well as for grid stabilization (stationary energy storage). Since their first commercialization by Sanyo, Sony, and Matsuhita in the early 1990ies, [1] LIBs enabled a wide range of portable electronics. Nevertheless, LIBs still require further improvements in terms of energy density, power density, lifetime, safety, and cost reduction, which presently drives enormous research efforts to focus on these topics. Typical research fields cover the advancement of active and inactive electrode materials, separators, electrolytes, as well as manufacturing techniques. Simulation approaches for characterization of fundamental physical and chemical processes during LIB operation highlighted surfaces and interfaces to have a substantial influence on LIB kinetics, in terms of electrolyte mass transport, charge-transfer (CT) reactions at anodic and cathodic active material (AM) particles, and electronic resistance at the electrode--current collector interface. Significant improvements to battery performance by surface/interface modification were yet demonstrated by calendering [2,3] or laser structuring [4][5][6][7][8] of electrodes, lamination of electrodes and separator, [9] or by enlargement of the current collector micro-surface. [10][11][12][13][14] Plasma-processes are well-known as a helpful tool in the field of LIBs. [15] Plasma-processes enable the production of nanosized AM particles, [16][17][18] carbon-based conductive AM coatings, [19] specialized 3D architectures for electrode nanowires, [20,21]

To meet the requirements of today’s fast-growing Li-ion battery market, cell production depends on cheap, fast and reliable methods. Lamination of electrodes and separators can accelerate the time-consuming stacking step in pouch cell assembly, reduce scrap rate and enhance battery performance. However, few laminable separators are available on the market so far. This study introduces electrospinning as a well-suited technique to apply thin functional polymer layers to common battery separator types, enabling lamination. The method is shown to be particularly appropriate for temperature resistant ceramic separators, for which stable interfaces between separator and electrodes were formed and capacity fading during 600 fast charging cycles was reduced by 44%. In addition, a straightforward approach to apply the method to other types of separators is presented, including separator characterization, coating polymer selection, mechanical tests on intermediates and electrochemical validation in pouch cells. The concept was successfully used for the modification of a polyethylene separator, to which a novel fluoroelastomer was applied. The stability of the electrode/separator interface depends on the polymer mass loading, lamination temperature and lamination pressure, whereas poorly selected lamination conditions may cause damage on the separator. Appropriate adhesion force of 8.3 N/m could be achieved using a polymer loading as low as 0.25 g/m2. In case separator properties, coating polymer, morphology of the fibrous coating and lamination conditions are well adjusted to each other, the implementation of electrospinning and lamination allows for faster, more flexible and robust pouch cell production at comparable or better electrochemical cell behaviour.