4.1 Global Warming Potential and Resource Depletion Trade-Offs
Applying life cycle assessment frameworks to automotive traction batteries at end-of-life reveals critical trade-offs between cascaded stationary deployment and direct closed-loop material recovery. When evaluating traction batteries retired from mobile use, cascaded stationary systems temporarily defer recycling processes and mitigate primary battery manufacturing impacts (Bobba et al., 2018). This prolonged operating phase effectively amortizes the initial manufacturing burdens across an extended functional lifespan, thereby lowering overall global warming potential per unit of delivered energy (Kotak et al., 2022). However, as highlighted in ecological impact analyses of industrial battery treatment pathways, direct hydrometallurgical and pyrometallurgical routes yield immediate mineral recovery that reduces virgin resource depletion for critical raw materials such as nickel, cobalt, and lithium (Dewulf et al., 2016). For German original equipment manufacturers, the decision to prioritize second-life deployment over prompt recycling introduces a temporal lag in closed-loop supply chains. Consequently, while stationary storage configurations provide substantial greenhouse gas displacement when offsetting fossil-heavy grid operations, the environmental benefits diminish if battery degradation results in degraded round-trip efficiency during the second life (Bobba et al., 2018; Kotak et al., 2022). Sustainable original equipment manufacturer circularity strategies must therefore balance deferred material recovery against the net life-cycle emissions achieved throughout the secondary service duration.