Lithium-ion batteries could last longer with chemical tweak

Extending the Lifespan of Lithium-Ion Batteries with Innovative Chemistry

A groundbreaking study suggests that the longevity of lithium-ion batteries could be significantly increased through the application of cost-effective chemistry techniques.

Lithium-ion batteries, comprising a negative anode, a positive cathode, and a porous separator immersed in an electrolyte, facilitate the movement of lithium ions between the electrodes during charging and discharging cycles.

Traditionally, the electrolyte at the negative electrode deteriorates to form a protective layer, ensuring battery stability and enhancing durability.

However, creating a similar protective coating on the cathode has posed challenges due to the different electrical conditions, causing conventional electrolytes to degrade rapidly before a stable layer can develop. Addressing this issue, researchers led by Chunsheng Wang at the University of Maryland devised a simple yet effective solution borrowed from organic chemistry.

This innovative approach enhances the electrolyte’s receptiveness to electrons, directing its breakdown into a controlled process that fosters the formation of a durable protective coating on the cathode.

Xiyue Zhang, a postdoctoral research associate in Wang’s team, highlights the precision achieved in controlling the cathode’s protective layer at a molecular level.

Moreover, the flexibility of this chemical process allows for customization of the cathode-electrolyte layer, offering varying degrees of protection. This adaptability enables the optimization of batteries for enhanced power and energy output or extended lifespan and stability.

Michel Armand from CIC energiGUNE in Spain commends the safety and manufacturability of these modified batteries, emphasizing the potential for prolonged cycling and improved performance.

While the exact magnitude of the longevity boost remains uncertain, ongoing research aims to clarify the extent of improvement achievable with this novel chemistry.

Wang expresses optimism regarding the practicality of implementing this approach in consumer-grade batteries post safety and long-cycle testing, underscoring the potential for a significant advancement in battery technology.