Fast Charging Sodium-ion Batteries

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Due to the increased atomic radius of sodium-ions compared to lithium-ions, conventional graphite anodes used in secondary lithium-ion batteries are not suitable for rechargeable sodium-ion batteries. Carbon based anodes are still the primary choice for rechargeable batteries due to their superior electronic conductivity. Although a number of carbon based materials are demonstrated as anodes for sodium-ion batteries, their electrochemical performance is limited due to the sluggish diffusion of sodium-ions. In addition, synthetic methods reported are expensive and difficult to scale-up.

Researchers at Purdue University have developed a new potential anode for rechargeable sodium-ion batteries. Amorphous carbon nanosheets of 10 to 100 nanometer thickness are fabricated through a scalable and inexpensive method using glucose precursor and sodium chloride. These 2D anodes have exhibited high specific capacities up to 350 mAh/g, the highest value reported for a carbon-based anode. This significantly better electrochemical performance of the carbon nanosheet electrodes is attributed to the 2D morphology and disordered microstructure, which allows for superior sodium-ion intercalation. This technology would be implemented into existing rechargeable battery systems, resulting in a more efficient and energy-dense battery.

-High specific capacity
-Excellent cycling stability

Potential Applications:
-Battery technology
-Energy storage
Jan 11, 2021
Utility Patent
United States

Jan 9, 2020
United States
Purdue Office of Technology Commercialization
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