Flexible lithium battery targets wearables: Page 2 of 3

May 29, 2019 //By Jean-Pierre Joosting
Flexible lithium battery targets wearables
PolyU's A novel lightweight Textile Lithium Battery developed by PolyU demonstrates high energy density of more than 450 Wh/L, and excellent flexibility with a bending radius of less than 1-mm, as well as foldability of over 1,000 cycles with marginal capacity degradation.

The lithium battery is currently the dominant rechargeable battery in the market due to its relatively high energy density and long cycle life. As the conventional bulky heavy lithium battery is hard for use in wearable devices, over the past decade, scientists looked to develop a flexible lithium battery, often by using metal foils as current collectors. However, it is only until the emergence of the Textile Lithium Battery that the bottlenecks over energy density, flexibility, mechanical robustness and cycling stability being addressed.

To create the battery, a patented novel technology of Polymer-Assisted Metal Deposition (PAMD) from PolyU, highly conductive metal, copper (Cu) and nickel (Ni) are uniformly and conformally deposited onto pre-treated fabrics. Such fabricated metallic fabrics, featuring low sheet resistance and large surface area, serve as current collectors in battery. After adding active materials to act as cathode and anode, the metallic fabrics, together with separator and electrolyte, are assembled into the Textile Lithium Battery.

In general, the larger the surface areas for loading anode and cathode materials, the greater stability, higher charge/discharge speed and better flexibility is the battery. Applying the PolyU patented PAMD technology to control the deposition time, the thickness and sheet resistance of the metallic yarns can be easily controlled. By weaving the metallic yarns into a 3D metal fabric, its surface areas for loading the active materials, in comparison of a 2D metal foil sheet of the same size, is much enhanced.

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