Beyond the lithium-ion trilemma: a six-dimension integrated battery sustainability framework

Lithium-ion batteries (LIBs) have underpinned the growth of electric vehicles and the integration of renewable energy since their commercial introduction in 1991. While gravimetric energy density increased from about 80 to over 270 Wh kg^-1, their pack price decreased to 100-150 USD kWh^-1, and total global production surpassed 500 GWh in the early 2020s, reaching several TWh by 2030. Rapid scaling up raises concerns about resource availability, safety, and end-of-life waste management. This review provides a quantitative, lifecycle-based evaluation of lithium-ion battery technologies, combining materials science, electrochemistry, safety, and circular economy. The paper proposes an Integrated Battery Sustainability Framework (IBSF) that encapsulates the conflicts in six aspects: energy density (E), cost (C), safety (σ), recyclability (R), life-cycle environmental impact (L), and social responsibility (S). A safety index based on standardized ARC/DSC measurements and a social responsibility metric from the literature are new additions to this metric system, grounded in verifiable data. Based on 187 records selected out of 842 and using survey weights, no chemistry performs best on all six criteria: LFP is the safest and socially responsible but poor on energy density; NMC811 has high energy density but is not safe and environmentally sustainable; LCO has the lowest safety score among the five chemistries; LMFP falls between them; NCA comes second on energy density at 240 Wh kg^-1 but scores the least in environmental justice (EJ = 0.000) because of severe water stress in Indonesia due to nickel mining in place of the old cobalt ethical issues. At the same time, LCO's good recyclability is marred by low social responsibility. When EV sector weightings are applied - one of several application-specific weight sets examined in this work, not a universal ranking LFP receives the highest composite IBSF score (0.645), followed by LMFP (0.601) and NMC811 (0.486), which are consistent through 86% of 1000 Monte Carlo tests (with ±10% perturbations). Notably, the results show a significant discrepancy between the recyclability of LFP batteries (55%) and their potential for direct recycling (85%), indicating that increasing the scale of recycling is the most urgent task when implementing a circular economy approach. The framework is designed for future updates as battery-passport data and higher-TRL recycling routes emerge.