Quest for Sustainability: Life-Cycle Emissions Assessment of Electric Vehicles Considering Newer Li-Ion Batteries

Almeida, Arminda; Sousa, Nuno; Coutinho-Rodrigues, João · 2019 · Crossref

DOI: 10.3390/su11082366

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Summary

This study addresses the environmental sustainability of battery electric vehicles (BEVs) by evaluating the life-cycle emissions of newer lithium-ion (Li-ion) battery chemistries. While BEV adoption is increasing to meet sustainable transportation goals, the environmental impact of advanced battery technologies—such as lithium-manganese rich cathodes and silicon/graphite anodes—has not been thoroughly assessed in existing literature. The research aims to determine whether these newer chemistries offer genuine environmental improvements over older technologies and to quantify the influence of electricity generation mixes and vehicle segments on greenhouse gas (GHG) and air pollutant emissions. The authors utilized the Greenhouse Gases, Regulated Emissions, and Energy Use in Transportation (GREET) 2018 model to conduct a comprehensive life-cycle assessment. The analysis covered eight distinct Li-ion battery chemistries, including current types like LMO and NMC111, as well as next-generation options like NMC811 and LMR-NMC with graphite-silicon anodes. The study examined four vehicle segments (small, medium, large, and SUV) represented by prototype vehicles derived from market data. Additionally, it incorporated 13 electricity generation mixes, ranging from current OECD data to future World Energy Outlook scenarios, to assess the impact of varying primary energy sources. The analysis considered both scenarios with and without battery replacement during the vehicle’s lifetime, resulting in 884 total simulations. Emissions were expressed as ratios relative to equivalent petrol internal combustion engine vehicles, and two-way analysis of variance was used to test statistical significance. The results indicate that newer Li-ion battery technologies can yield significant environmental benefits compared to older chemistries. Specifically, the study found that advanced battery types can reduce emissions by up to 60%, depending on the specific pollutant and the electricity generation mix used. The analysis confirmed that the electricity mix is a critical determinant of emission estimates, with carbon intensity and primary energy sources heavily influencing outcomes. Furthermore, vehicle size remained a significant factor, with heavier vehicles generally producing higher emissions. The statistical analysis validated that differences in battery chemistry and electricity mix significantly affect life-cycle emissions, providing a robust comparison across different technological and operational scenarios. This research contributes to the field by providing a standardized, statistically rigorous comparison of BEV environmental impacts using consistent assumptions. It highlights that advancements in battery chemistry, particularly those reducing cobalt content and increasing energy density, can substantially lower life-cycle emissions. The findings underscore the importance of decarbonizing electricity grids alongside improving battery technology to maximize the sustainability benefits of electric vehicles. By focusing on multiple pollutants rather than just GHGs, the study offers a more holistic view of the environmental trade-offs associated with the transition to electric mobility.

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