Abstract
Purpose
We observe a methodological gap for assessing impacts within the Area of Protection (AoP) Natural Resources in LCA with regard to concerns about the accessibility to raw materials. Adding criticality considerations as a complement to environmental LCA addresses abiotic resources accessibility. We present a study that integrates and applies an improved GeoPolRisk midpoint and the published GeoPolEndpoint methods as valuable enhancements to the current pool of available impact methods in LCA.
Methods
GeoPolEndpoint, an extension of the GeoPolRisk method, was designed to quantify the impacts of the use of raw materials from a criticality perspective at the endpoint level. We present an integrated characterization model including an improved midpoint method, which truly takes into account the mass flow extracted for a product, to operationalize the use of these methods at both midpoint and endpoint level within LCIA. We study the impacts of four relevant metals (Al, Co, Cu, and Ni) in the life cycle of lithium-ion batteries (LIB) for the years 2015 to 2017 from the perspective of the EU. Inventory data are based on previously published studies with a detailed bill of materials for two types of LIB. As part of an integrated assessment, results at midpoint and endpoint levels were compared to other impact categories within the context of an attributional LCA.
Results and discussion
From the analyzed raw materials, copper and nickel contribute significantly to environmental impacts; however, cobalt has a high geopolitical supply risk indicator and higher contribution at the GeoPolEndpoint despite its relatively low contribution to the environmental footprint of LIB. Results show the importance of specific raw materials present in small quantities, but with a high contribution when applying a criticality lens as a complement to LCA. The new method has the potential to be operationalized in LCA studies and to provide new insights on supply risk during product development.
Conclusions
Impacts of the use of raw materials deemed critical are not only restricted to an environmental dimension; we can model socio-economic impacts through a criticality perspective. The GeoPolRisk and GeoPolEndpoint methods allow the integration of a supply risk perspective into LCA studies. With the introduction and development of new technologies, the evaluation of raw material criticality in LCA becomes an important complement to environmental indicators. This case study provides a baseline for future applications of the method to products and technologies that require the use of critical raw materials throughout their life cycle.
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Data availability
All data generated during this study are included in this published article and its supplementary information files.
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Santillán-Saldivar, J., Gemechu, E., Muller, S. et al. An improved resource midpoint characterization method for supply risk of resources: integrated assessment of Li-ion batteries. Int J Life Cycle Assess 27, 457–468 (2022). https://doi.org/10.1007/s11367-022-02027-y
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DOI: https://doi.org/10.1007/s11367-022-02027-y