Flexible and Printable Paper-Based Al Ion Batteries


The present invention is a low-cost, flexible and rechargeable battery technology built on a single piece of paper. It is mainly composed of an Al foil anode, an electrolyte-absorbed paper and an Al ion storage cathode.

  • Flexible and Printable Paper-Based Al Ion Batteries
Commercialisation opportunities
Exclusive Licensing
Problem addressed

Conventional Li ion battery is relatively high cost for some low-cost portable electronic applications. It has safety concerns because of its organic electrolyte and its strict requirements on its disposal and recycle, which may cause pollution if not handled properly.

  • The present paper-based Al ion battery is extremely low-cost because of its cheap raw material and simple fabrication process.
  • It is highly safe because of the utilization of incombustible aqueous electrolyte.
  • It is environmental-friendly because of its green raw materials, that is, Al foil, cellulose paper and carbon.
Key impact
  • Paper is selected as the battery backbone
  • Super-concentrated aqueous electrolyte is employed instead of organic electrolyte
  • The electrodes can be directly printed onto the paper
  • Battery
  • Robotics


  • US Application No. 17/687,718
The University of Hong Kong (HKU)

Founded in 1911, The University of Hong Kong (HKU) is the first and oldest institution of higher education in Hong Kong. For over a century, the University has dedicated itself to creating knowledge, providing education, and serving society. Today, HKU has an established worldwide reputation for being a research-led comprehensive University with ten Faculties and a strong commitment to intellectual freedom, liberty and diversity. HKU has a proud record of academic recognition in researches through honours and awards received from both local and international bodies.