Substitutes

Substitutes and Alternatives for Graphite

The availability of viable substitutes is a key factor in assessing Graphite's criticality. Across its 3 primary applications, substitution options range from commercially viable alternatives with performance trade-offs to applications where Graphite currently has no effective substitute.

Substitution Analysis by Application

The following table details available substitutes for Graphite across its primary applications, including the trade-offs involved:

Performance Trade-offs

In most applications, substituting Graphite involves measurable performance penalties. Silicon offers 10x theoretical capacity but suffers from volume expansion and cycle life issues; silicon-graphite blends (5-15% Si) are the near-term compromise; hard carbon is used in sodium-ion batteries. In high-performance applications such as lithium-ion battery anodes, these trade-offs can be particularly significant.

Research and Development

Active research programs are underway to develop improved substitutes and to reduce the amount of Graphite required per unit of product (thrifting). However, timelines for commercializing new alternatives typically span years to decades. The limited substitutability of Graphite is a primary driver of its high criticality rating, prompting government-funded substitution research programs.