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AI discovers five new materials for post lithium batteries

byKerem Gülen
August 25, 2025
in Research

Researchers have turned to artificial intelligence to solve a problem that has vexed materials scientists for decades: how to efficiently discover new materials that can outperform the reigning lithium-ion battery. A groundbreaking study published in Cell Reports Physical Science reveals a powerful new AI-driven methodology that has already identified five novel material candidates, potentially accelerating the move toward a post-lithium future with longer-lasting, safer, and more environmentally sustainable batteries.

The great battery bottleneck: A needle in a haystack

For all their ubiquity, lithium-ion batteries have limitations. The reliance on rare-earth metals like lithium and cobalt presents significant supply chain risks and environmental concerns. Furthermore, the technology is approaching a plateau in terms of energy density and performance. Scientists have long theorized that materials known as Transition Metal Oxides (TMOs) hold immense promise. Their versatile crystal structures and high ionic conductivity make them ideal candidates for batteries that use abundant, multivalent ions like zinc, magnesium, and aluminum instead of lithium.

The challenge, however, is monumental. The number of possible TMO structures, combining various elements in different ratios and configurations, is astronomically vast. Exploring them with traditional experimental methods or even standard computational techniques like Density Functional Theory (DFT) is a classic “needle in a haystack” problem—prohibitively slow and expensive. It is this bottleneck that the new research aims to break with a sophisticated, dual-pronged generative AI framework.

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A dual AI framework for accelerated discovery

Rather than relying on a single model, the researchers designed a synergistic system where two different types of generative AI were used to explore the chemical space from different angles. This approach ensures a more comprehensive and robust search for viable new materials.

The first component is a Crystal Diffusion Variational Autoencoder (CDVAE). This model was designed to be the creative explorer. It was trained on a massive dataset of over 44,000 known TMO structures, allowing it to learn the fundamental “rules” of how stable crystals are formed. The CDVAE then uses this knowledge to generate a wide diversity of new, plausible crystal structures—many of which have never been seen before. In the study, it generated an initial pool of 10,000 candidates, demonstrating its power in exploring a broad range of novel configurations.

The second component is a fine-tuned large language model (LLM), specifically a version of Meta’s Llama-3.1 model. While we typically associate LLMs with text, the researchers cleverly adapted it to the language of chemistry. They converted complex crystal structures into tokenized sequences of text that the LLM could process. The model’s strength lies not in broad exploration, but in precision. It excels at generating structures that are very close to thermodynamic equilibrium, meaning they are highly stable and more likely to be synthesizable in a lab. This model also produced 10,000 structures, but they were concentrated in a narrower, more stable region of the chemical space.

Once these tens of thousands of candidates were generated, they were passed to a third AI model, a forward machine learning tool called ALIGNN, which acted as a rapid screening filter. It quickly predicted crucial properties for each structure—such as its formation energy, band gap, and “energy above the hull” (a key metric for stability)—allowing the researchers to discard unpromising candidates and focus only on the most viable ones.

Comparing the AI creators: Stability versus novelty

One of the most fascinating outcomes of the study was the clear difference in the materials generated by the two models. The LLM produced a much higher percentage of structures that were considered thermodynamically stable, with an “energy above the hull” value below the 0.08 eV/atom threshold. Specifically, 46% of its filtered candidates were stable, compared to just 15% from the CDVAE.

However, this doesn’t tell the whole story. While the LLM’s creations were more stable “out of the box,” the CDVAE produced a much wider range of structures with greater structural diversity. Its ability to generate materials with lower-symmetry space groups allowed it to find unique configurations that, while initially less stable, had the potential to relax into even deeper energy minima than anything the LLM found. This suggests the CDVAE is superior for discovering truly novel, deep-energy phases that could be synthesized under specific non-equilibrium conditions.

This trade-off is crucial: the LLM is better for finding materials that are easy to make, while the CDVAE is better for finding potentially groundbreaking materials that might require more advanced synthesis techniques.

The breakthrough: five new TMOs for next-gen batteries

The ultimate triumph of the project came from the CDVAE model, which successfully generated five novel TMO-based structures with properties ideal for multivalent-ion batteries. These materials, including compositions like CuSn₂OF₈ and Ca₄O₂In₂, feature the large, open-tunnel frameworks that are essential for allowing larger ions to move through the electrode efficiently and safely.

To confirm the viability of these discoveries, the team performed phonon dispersion calculations on a representative structure, Ca₄O₂In₂. The results showed no lattice instabilities, confirming its dynamical stability. Even though it is considered metastable, its structure is sound, opening the door for its potential synthesis. This step validates that the AI is not just generating theoretical fantasies, but physically plausible materials worthy of experimental pursuit.


Featured image credit

Tags: AIbatterylithium

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