Key Takeaways & Executive Findings
- •• Binders are critical yet often overlooked components that significantly influence the lifespan and performance of lithium-ion battery electrodes. • The review systematically summarizes optimization strategies for novel binders tailored to LiFePO₄ and transition metal oxide cathode systems, addressing their respective advantages and limitations. • Future development trends emphasize the challenges and opportunities for binders in enhancing thermal safety and enabling all-solid-state battery systems. • Innovative binder design is essential for maintaining electrode mechanical integrity, achieving high energy density, and promoting sustainable development of LIBs.
Abstract
Long-life energy storage batteries are integral to energy storage systems and electric vehicles, with lithium-ion batteries (LIBs) currently being the preferred option for extended usage-life energy storage. To further extend the life span of LIBs, it is essential to intensify investments in battery design, manufacturing processes, and the advancement of ancillary materials. The pursuit of long durability introduces new challenges for battery energy density. The advent of electrode material offers effective support in enhancing the battery’s long-duration performance. Often underestimated as part of the cathode composition, the binder plays a pivotal role in the longevity and electrochemical performance of the electrode. Maintaining the mechanical integrity of the electrode through judicious binder design is a fundamental requirement for achieving consistent long-life cycles and high energy density. This paper primarily concentrates on the commonly employed cathode systems in lithium-ion batteries, elucidates the significance of binders for both, discusses the application status, strengths, and weaknesses of novel binders, and ultimately puts forth corresponding optimization strategies. It underscores the critical function of binders in enhancing battery performance and advancing the sustainable development of lithium-ion batteries, aiming to offer fresh insights and perspectives for the design of high-performance LIBs.
1. Introduction
Due to the gradual depletion of traditional fossil fuels and the environmental pollution caused by their production and use, there is a global consensus and trend toward accelerating the transformation of energy structures, improving energy efficiency, and reducing environmental pollution from energy sources [1]. Against this backdrop, in order to drive energy innovation and promote sustainable development, new energy systems are being vigorously developed. Among these, lithium-ion batteries (LIBs) stand out as a highly promising type of new energy storage device, and research focused on achieving their high-performance applications is of significant importance and value [2].
In recent years, to meet the growing energy demand, the focus of researchers has been on how to further enhance the energy density and long-term stable cycling of LIBs’ electrochemical performance [3, 4]. Consequently, there has been a surge in interest in improving and optimizing the components of LIBs, including the cathode [5], electrolyte [6], separator, and anode [7–10]. Lithium iron phosphate (LiFePO4, LFP) and transition metal oxide cathodes are the most widely used cathode materials by battery manufacturers. Although the energy density of LFP is lower than that of transition metal oxide cathodes, the stability of its olivine structure and the minimal structural contraction and expansion during cycling endow LFP batteries with excellent safety and long-cycle stability, leading to an increasing proportion in the new energy vehicle and energy storage industries [11–13]. Furthermore, with the continuous development of society, the demand for lighter and longer-lasting batteries presents new challenges for the development of LIBs. Under these circumstances, the development and use of electrode materials with higher specific energy have become particularly urgent. A multitude of transition metal oxide cathodes have been developed and applied, to further advance the rapid development of LIBs by increasing the energy density of the cathode materials.
However, in lithium battery systems, the full play of battery performance not only depends on the intrinsic characteristics of active materials, but also requires the synergistic support of inactive material although they do not participate in electrochemical reactions. They act like an “invisible skeleton” to support the functional architecture of the electrode.
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Tingrun Lai, Li Wang, Zhibei Liu, Adnan Murad Bhayo, Yude Wang, Xiangming He (2026). Tackling Challenges and Exploring Opportunities in Cathode Binder Innovation. Nano-Micro Letters. https://doi.org/10.1007/s40820-025-01848-4
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Frequently Asked Questions
What is the role of binders in lithium-ion battery cathodes?
Binders are crucial for maintaining the mechanical integrity of the electrode, ensuring adhesion between active materials, conductive additives, and current collectors, which is essential for long-term cycling stability and high energy density.
Which cathode systems are focused on in this review?
The review focuses on LiFePO4 and transition metal oxide cathode systems, which are the most widely used cathode materials in lithium-ion batteries.
What are the key challenges for cathode binders?
Key challenges include enhancing binder performance to support high energy density, ensuring thermal safety, and adapting to all-solid-state battery systems.
What optimization strategies are discussed for novel binders?
The review systematically summarizes performance optimization strategies for novel binders, tailored to the respective advantages and limitations of different cathode materials.
Why is binder innovation important for sustainable development of LIBs?
Innovative binder design can improve battery performance, extend lifespan, and enable safer and more efficient energy storage, contributing to the sustainable development of lithium-ion batteries.
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