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The environmental impact of electric vehicles: a comparative LCA-based evaluation framework and its application to the Italian context

机译:电动汽车对环境的影响:基于LCA的比较评估框架及其在意大利的应用

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In the last years a progressive shift from the traditional internal combustion engine vehicles (ICEV) toward electric vehicles (EV) has been observed, which has as primary objective that of favouring a sustainable mobility. Indeed, one of the most important topics tightly linked with this alternative refers to the greenhouse gas (GHG) emissions produced along the entire vehicle’s life cycle. The aim of the present work is to develop an emission-model that is able to calculate the CO2 emissions produced along the entire vehicle’s life cycle, so to estimate EV CO2 emission values and compare them with those of ICEV. The emission model, developed leveraging on a thorough literature review on the topic, is then applied to the Italian context, to enable a comparison of the emission results for EVs and ICEVs taking into account the peculiarities of such country. It emerges that overall CO2 emissions associated to EVs are lower than the ones associated to ICEVs. A significant portion of emissions arising from the manufacturing of the battery pack still represents the main gap to be filled with respect to ICEVs. Evaluating both vehicle typologies and based on different assumption in terms of the geographical locations in which the stages of the vehicle life cycle take place, it emerges that EVs show a consistent CO2 emission reduction ranging between -11% to -50% compared to ICEVs over the entire vehicle’s life cycle. The most relevant contribution for such performance is due to the cleaner energy mixes on which some countries can rely on compared to others. Given that the most impactful phase – in terms of CO2 emissions - is represented by the vehicle use, it has been performed a sensitivity analysis on the energy mix used for vehicle’s charging. Results show that coupling of Renewable Energy Sources (RES) and EVs can be a key factor for achieving very low emission values.
机译:在过去的几年中,已经观察到从传统的内燃机汽车(ICEV)向电动汽车(EV)的逐步转变,其主要目的是促进可持续的机动性。确实,与此替代方案紧密相关的最重要主题之一是指整个车辆生命周期内产生的温室气体(GHG)排放。当前工作的目的是开发一种排放模型,该模型能够计算整个车辆生命周期内产生的CO2排放,从而估算EV CO2排放值并将其与ICEV的排放值进行比较。然后,通过对该主题进行全面文献综述而开发的排放模型被应用于意大利,以考虑到该国的特殊性,比较电动汽车和ICEV的排放结果。结果表明,与电动汽车相关的总CO2排放量低于与电动汽车相关的CO2排放量。由于电池组的制造而产生的大部分排放仍代表着与ICEV相比要填补的主要差距。根据车辆生命周期各个阶段的地理位置,对两种车辆类型进行评估并根据不同的假设进行评估,结果表明,与ICEV相比,EV的二氧化碳排放量持续降低了-11%至-50%整个车辆的生命周期。与此类国家表现最相关的贡献是一些国家与其他国家相比可以依靠的清洁能源组合。鉴于最有影响力的阶段(就CO2排放而言)以车辆的使用为代表,因此已经对用于车辆充电的能源组合进行了敏感性分析。结果表明,可再生能源(RES)和电动汽车的耦合可能是实现极低排放值的关键因素。

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