( <i>Invited</i> ) Carbon Materials in Batteries: Requirements, Trade-Offs, and Pathways for Scalable Anodes and Conductive Additives

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Researchers should note the process-based cost modeling framework and the identified gap between laboratory synthesis and industrial scale-up.

🏢実務担当者:Battery manufacturers can use the cost comparisons to evaluate alternative sourcing for graphite and CNT, and consider process innovations like catalytic graphitization.

🏛政策担当者:Policymakers should note the supply chain concentration risks for graphite and the need for investment in alternative production routes.

Carbon is critical to modern electrochemical energy storage, fulfilling two fundamentally different but complementary roles: as the primary lithium-ion intercalation host in anodes, and as electronically conductive additives that enable high power, mechanical integrity, and manufacturability of composite electrodes. Despite their shared elemental composition, these carbon materials impose markedly different, and often competing, requirements on structure, purity, morphology, and cost. This talk examines the scientific and industrial constraints that govern carbon deployment in batteries, with a focus on graphite anodes and carbon nanotube (CNT) conductive additives, and identifies traits and synthesis routes toward scalable, economically viable production. Graphite remains the dominant anode material for lithium-ion batteries due to its favorable electrochemical potential, long cycle life, and mature processing routes. However, the graphite supply chain is increasingly constrained by rapid demand growth and high geographic concentration. Process-based cost modeling shows that battery-grade graphite production outside China currently faces cost premiums of 100–200%, driven primarily by capital intensity, graphitization energy requirements, and shaping yields. These economic pressures impose strict performance requirements on graphite, such as high crystallinity, controlled particle morphology, and surface coatings to improve first-cycle efficiency, while simultaneously limiting tolerance for costly processing steps. The analysis highlights that breakthroughs in graphite competitiveness will likely depend less on incremental electrochemical gains and more on process innovations that reduce graphitization temperature, improve shaping yields, or bypass conventional Acheson furnace routes altogether, such as catalytic graphitization, methane pyrolysis, or recycling-derived graphite. In contrast, carbon nanotubes are used in batteries not as active materials but as percolating conductive networks that enable high-rate performance at low additive loadings. Industrial CNT production has expanded rapidly over the past decade, reaching ~25 kt yr⁻¹ globally in 2024, driven largely by lithium-ion battery demand. CNT powders produced via fluidized-bed and floating-catalyst chemical vapor deposition (CVD) are now commercially integrated into slurry-based electrode manufacturing at gigafactory scale. Unlike graphite, CNT value is dictated less by bulk crystallinity and more by aspect ratio, defect density, dispersion behavior, and compatibility with existing electrode processing. Recent advances in high-quality CNTs enable significant reductions in additive loading while maintaining conductivity, translating directly into higher energy density and improved mechanical durability of electrodes. A key theme of this talk is that economic viability increasingly defines the allowable design space for both carbon classes. Battery-grade CNT prices have fallen below $20 kg⁻¹ for powders and $2–3 kg⁻¹ in slurry form, positioning CNTs competitively against carbon black in high-performance applications. However, scaling CNT production beyond tens of kilotons per year will require reactors with higher throughput, improved heat and mass transfer, and reduced capital intensity. Similarly, graphite production must reconcile stringent electrochemical specifications with cost targets that are increasingly shaped by geopolitical risk, financing rates, and qualification timelines. Comparisons between graphite and CNTs in terms of electrochemical function, morphology control, reactor design, and techno-economics, we examine why differing forms of carbon exist for batteries, and where remaining questions lie. Future progress will likely depend on co-optimizing materials synthesis and manufacturing pathways to meet sharply different performance requirements at scale. The findings underscore the need for closer coupling between carbon synthesis research, battery qualification metrics, and industrial process design to ensure that next-generation carbon materials can be deployed rapidly and economically in commercial batteries.

• openalex https://doi.org/10.1149/ma2026-018727mtgabsfirst seen 2026-07-18 05:31:55