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Home Science News Technology and Engineering

Sodium-Ion Batteries Require Major Innovations to Compete

January 13, 2025
in Technology and Engineering
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Legions of battery engineers and their proponents have long pursued the goal of developing batteries that are cheaper than the dominant lithium-ion technology. This drive is heightened by the desire to capture a slice of lithium-ion’s expanding market, which is valued at a staggering $50 billion annually. In the quest for alternatives, sodium-ion batteries have emerged as a promising contender, gaining traction among researchers, startups, and investors alike. The recent rise in lithium prices, exacerbated by supply chain challenges spurred by the COVID-19 pandemic, has brought sodium-ion batteries to the forefront of exploration in energy storage technologies. Nevertheless, a new study published in Nature Energy indicates that making sodium-ion batteries a viable low-cost alternative may take years, necessitating significant technological advancements and favorable market conditions.

Sodium-ion batteries are often believed to possess lower costs and more resilient supply chains compared to their lithium-ion counterparts. However, they confront a major challenge: their energy density, or the amount of energy stored per weight, tends to be lower than that of lithium-ion technology. Consequently, even if the material costs for sodium ions were to decrease, the cost per unit of stored energy still remains a hurdle that must be overcome. This reality may hinder wider commercial adoption of sodium-ion batteries unless groundbreaking research and innovations materialize soon. The recent study highlights critical areas where advancement is most necessary. This analysis stems from a partnership between Stanford University’s Doerr School of Sustainability and its Precourt Institute for Energy, along with the SLAC-Stanford Battery Center.

Initiatives like STEER, which evaluate the technological and economic viability of nascent energy technologies, are designed to inform stakeholders on how to direct investments and research efforts effectively. The recent study sifted through more than 6,000 different scenarios to assess the potential competitiveness of sodium-ion batteries against the well-established lithium-ion technology. Adrian Yao, the lead author of the study and a doctoral candidate heralding from a background in lithium-ion battery innovation, highlights that the increasing price of lithium-ion batteries since 2022 has necessitated the exploration for alternatives. Yao’s expertise and growth in the field culminate in the assessment of sodium-ion as a compelling alternative, mirroring the sentiments echoed by various battery companies that have committed to ramping up sodium-ion manufacturing in pursuit of lower costs.

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However, Yao also expresses caution, noting that the potential timeline and conditions for sodium-ion batteries to achieve price parity with lithium-ion solutions remain largely speculative. The persistent drop in lithium-ion prices complicates the picture further, thus stressing the importance of advancing sodium-ion technology to counteract the profitability of lithium-ion batteries. Moreover, the influential figures helming the study, also serving as Yao’s PhD advisors, emphasize the necessity of a multi-pronged approach that accounts for both technological breakthroughs and market scenarios.

The crux of the study centers around optimizing sodium-ion technology to reach energy densities comparable to lithium-ion alternatives, particularly the low-cost lithium-iron-phosphate variant. The researchers indicate that steering away from the more expensive nickel is vital for the advancement of sodium-ion technology. This focused strategy aims to provide a feasible roadmap for sodium-ion battery developers, enabling them to heighten their energy densities while maintaining competitiveness in cost. Yao asserts that understanding the broader economic landscape surrounding these technologies is critical in making informed decisions for future investments and innovation.

As the pressure mounts on lithium-ion technologies – with geopolitical risks arising from supply chain dependencies, including heavy reliance on critical materials like graphite – the landscape for sodium-ion batteries is evolving. Simulations conducted within the study suggest that unforeseen supply shocks could accelerate the competitiveness of sodium-ion batteries. Such shocks could arise from heightened restrictions on essential materials, which has proven to be a concern as witnessed with China’s stringent export policies on graphite, essential for lithium-ion batteries.

The researchers acknowledge market dynamics that could impede sodium-ion’s competitive stance. For example, should the price of lithium remain at historically low levels, sodium-ion may face challenges in carving out a more favorable economic position. The compelling factors influencing battery development extend beyond cell costs, as realized by industry experts participating in the study, signaling the necessity for technologies to succeed at the systems level rather than standalone solutions. This ensures that the integration of safety protocols and broader system considerations takes precedence during the engineering process.

The STEER initiative is making strides in broadening its research scope to investigate other vital technology arenas beyond sodium-ion batteries. With the assistance of industry leaders and insights from the Department of Energy, the team is conducting an extensive analysis of graphite’s supply chain and unraveling the complexities tied to this often-overlooked critical mineral. Recognizing the interdependence of various sectors, stakeholders from many walks of the battery and automotive industries convened to explore the holistic frameworks necessary for implementing resilient technologies.

STEER’s approach combines a deep understanding of commercial deployment experiences, systematic technology roadmaps, and input from government and research institutions. This collaborative endeavor aims to bolster the chances of identifying viable energy transition pathways while simultaneously filtering out less promising routes that could prove to be a dead end. Future analyses planned by STEER will tackle long-duration energy storage technologies and delve into other essential energy transition opportunities ranging from hydrogen solutions to transformative industrial decarbonization strategies.

The potential offered by sodium-ion technology remains compelling yet fraught with challenges. Researchers and industry executives alike echo the sentiment that innovative engineering pursuits will ultimately yield more significant cost reductions in sodium-ion battery technology than scaling production alone. The complexity of these advancements will play a pivotal role in determining the trajectory of sodium-ion technology as it seeks to establish itself in an increasingly congested field.

As the investigation within the realm of energy storage technologies unfolds, the insights gleaned from the recent study serve as a crucial guide to understanding not just the future of sodium-ion batteries, but also the broader implications for energy storage systems as they evolve amidst a changing geopolitical backdrop.

Subject of Research: Sodium-ion battery technology and its competitiveness against lithium-ion batteries
Article Title: Critically assessing sodium-ion technology roadmaps and scenarios for techno-economic competitiveness against lithium-ion batteries
News Publication Date: 13-Jan-2025
Web References: https://www.nature.com/articles/s41560-024-01701-9
References:
Image Credits: Credit: JNim Gensheimer

Keywords

Batteries, Electric vehicles, Energy storage.

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