The development of renewable energies, which are by nature intermittent (wind, solar), combined with the evolution of nomadic technologies (electric cars, laptops, cell phones, tablets, etc.), requires increasingly efficient rechargeable batteries. To address this challenge, Arkema offers a number of materials that improve energy storage, battery power and battery operating life.
The operation of lithium-ion batteries involves the exchange of lithium ions between a positive electrode (cathode) and a negative electrode (anode) during charge and discharge cycles. Cathodes are made up of bonded alloy particles capable of attracting lithium ions onto aluminum foil; anodes consist of graphite particles glued onto copper foil. This bonding, or binder, function of the active particles is key to the efficient performance of batteries.
Kynar® PVDF electrode binders and separator coatings
Electrode binders and separator coatings are critical to the performance and safety of lithium-ion batteries. For many years, Arkema has been a pioneer in lithium ion battery innovation. The Kynar® HSV series for electrode binders and Kynar® LBG series for separator coatings have become global reference products for extreme durability in batteries.
A new fluorine-based electrolyte
Another element that helps boost the efficiency of batteries involves the electrolyte, the medium in which lithium ions migrate from cathode to anode and vice versa during charge and discharge cycles.
The electrolyte also constitutes the source of lithium ions. Arkema develops new, more stable lithium salts as part of its fluorine chemistry activities, which help boost the operating life, safety and power of lithium-ion batteries.
Graphistrength®: significant boost in electrical conductivity
Graphistrength® carbon nanotubes can also be used to manufacture cathodes. Carbon nanotubes facilitate the flow of energy from cathode to anode, thereby allowing the batteries to be charged more quickly.