Extending the Lifespan of Dual-Ion Batteries: New Polymer Binder Developed

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【Summary】Researchers have developed a novel polymer binder that improves the durability of dual-ion batteries, a promising alternative to lithium-ion batteries in electric vehicles. The binder, which incorporates azide and acrylate groups, enhances the structural integrity of the graphite anode material and allows for swift reconnection. The batteries equipped with the new binder maintained exceptional performance even after 3,500 recharge cycles and demonstrated fast charging capabilities.

FutureCar Staff    Nov 03, 2023 9:37 AM PT
Extending the Lifespan of Dual-Ion Batteries: New Polymer Binder Developed

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When it comes to electric vehicles that rely on stored electric energy, the crucial factor lies in having rechargeable batteries that can withstand multiple charge cycles. Lithium-ion batteries have traditionally been the go-to choice for this purpose. However, due to limitations in energy storage capacity and other challenges, researchers have turned their attention to an intriguing alternative called dual-ion batteries (DIBs).

Dual-ion batteries utilize both lithium cations and counter anions simultaneously, providing a high energy density similar to traditional batteries. This allows them to store a significant amount of energy. However, they face a hurdle due to the larger anions, which can cause expansion and contraction of the graphite anode material during charge and discharge, ultimately leading to decreased battery durability.

In a recent breakthrough, a collaborative research team addressed the durability issues of dual-ion batteries through innovative polymer binder research.

The findings of this study have been published in Advanced Materials.

The binder plays a critical role in securing various chemicals within rechargeable batteries. In this study, the research team introduced a novel polymer binder that incorporates azide groups (N 3 -) and acrylate groups (C 3 H 3 O 2 ).

Azide groups form a strong covalent bond with graphite through a chemical reaction facilitated by ultraviolet light, ensuring the structural integrity of graphite during its expansion and contraction. On the other hand, acrylate groups facilitate the reconnection between the graphite and the binder, even if the bond is disrupted.

Experimental results demonstrated that dual-ion batteries equipped with the newly developed binder maintained exceptional performance even after enduring over 3,500 recharge cycles. These batteries also exhibited rapid charging capabilities, with approximately 88% of the original capacity being restored within just 2 minutes.

Professor Soojin Park, the driving force behind this research, explained, "Dual-ion batteries are not only cost-effective but also make use of Earth's abundant graphite resources. This research will encourage further exploration of dual-ion batteries, extending beyond electric vehicles to various other applications."

For more information, refer to the publication: Jieun Kang et al, Azacyclic Anchor‐Enabled Cohesive Graphite Electrodes for Sustainable Anion Storage, Advanced Materials (2023). DOI: 10.1002/adma.202306157

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