Improving the performance of lithium-ion batteries
From Kynar® resins to carbon nanotubes – the new materials developed by the Arkema group extend battery lifetime and increase storage capacity.
The increased use of mobile technologies, electric vehicles, and renewable energies require the development of rechargeable batteries which are ever more efficient, light and robust.
Through its development of polymers and components specifically designed for lithium-ion batteries, the Arkema group is providing energy storage specialists with effective solutions.
During the charging and discharging cycles, lithium ions go through a separator and flow back and forth between the cathode and anode. Cathodes are made by binding active material particles to an aluminum or copper sheet.
Developed by the Arkema group, Kynar® polyvinylidene fluoride resins (PVDF) are an optimized range of materials for lithium-ion batteries. These polymers can be used as a microporous separator or as a cathode binder.
In particular, Kynar® and Kynar® Flex polymers have all the necessary characteristics for cathode binders:
- Exceptional purity which prevents electrochemical interferences,
- Excellent adhesion to electrodes,
- High electrochemical, thermal and chemical stability,
- Ease of implementation.
Always at the forefront of innovation, the Arkema group has developed a new binder for lithium-ion batteries: the Kynar® HSV 900. This resin ensures perfect adhesion during the manufacturing of electrodes. It limits the quantity of Kynar® which is required, while improving battery performance.
Anticipating the future
Research is also being conducted on the future generations of batteries which will use new materials for the electrodes, e.g. carbon nanotubes. In addition to improving the electrical conductivity of electrodes, these nanomaterials increase the mechanical resistance, which is strongly challenged during each charging/recharging cycle. As a result, the performance and lifetime of lithium-ion batteries are optimized.