Lithium-ion batteries are widely used throughout the world as batteries for smartphones, electric vehicles, renewable energy power generation equipment, etc. With demand expected to increase in the future as we work to protect the global environment and realize a decarbonized society, the challenge now is to increase battery capacity, enhance productivity and reduce environmental load during the production process.
LUNA ACE, a dispersant developed by Kao for lithium-ion batteries selectively disperses the conductive material which helps increase battery capacity, enhance productivity and reduce environmental load.
Structure of lithium-ion batteries and the function of dispersants
Lithium-ion batteries are comprised of a positive electrode (cathode), a negative electrode (anode), a separator that divides the two electrodes and an electrolyte that fills the gap in between. The electrodes consist of a metal foil, an active material containing lithium, a binder which helps to adhere the active material to the foil, and a conductive material (carbon black or CNT*, etc.) which plays the role of conducting electricity.
Carbon black and CNT used in conductive materials have a very large specific surface area and are difficult to disperse, therefore a superior dispersant is required to form an optimal conductive network.
On the other hand, the dispersant itself is an impurity in finished lithium-ion batteries, making it extremely important to suppress the adverse effect it has on battery performance.
*CNT = Carbon nanotubes
Features of LUNA ACE
Harnessing its unique polymer design technologies cultivated for dispersing a variety of fine particles such as pigments for inkjet , metals for electronic materials , etc., Kao has developed a highly functional dispersant suitable for lithium-ion batteries.
LUNA ACE has the following three functional groups.
● Adsorbent group: Enables selective adsorption to conductive material
● Dispersant group: Achieves superior dispersion
● Functional group: Suppresses dissolution into electrolyte, providing high voltage endurance
LUNA ACE dramatically reduces the viscosity of the electrode paste.
Superior dispersion provides the following benefits.
● Increases the solid content of electrode paste and reduction in the amount of solvent used
● Reduced viscosity of electrode paste for materials that are difficult to disperse, such as CNT
● Enhanced electrode yield (formation of smooth coating)
● Enhanced productivity
● Reduced environmental load
Benefits of low viscosity electrode (cathode) paste
using LUNA ACE
Comparison of electrode (cathode) paste
(solid content : 75%)
Battery evaluation in Kao
Kao has established a framework for the evaluation of its batteries, and after confirmation of battery performance using Kao's dispersant, we are able to provide optimum formulations to achieve superior performance.
● Coin cell/laminated cell battery production
● CV measurement
● Charge/discharge measurement
● Cycle evaluation
● AC impedance
● Environmental test
If you have any questions or require additional information about LUNA ACE, please use the form below.