Improved Li+/Na+ Battery with an Aqueous Electrolyte

  • Author:
  • Published: 26 September 2020
  • Copyright: Wiley-VCH GmbH
  • Source / Publisher: Small/Wiley-VCH
thumbnail image: Improved Li<sup>+</sup>/Na<sup>+</sup> Battery with an Aqueous Electrolyte

Lithium-ion batteries are very commonly used because they provide high energy densities and have a long cycle life. However, they can have safety problems due to the use of organic electrolytes. Rechargeable batteries with aqueous electrolytes could reduce these hazards, as well as the environmental impact and cost of the batteries. However, their practical application is hampered by low energy densities and poor cycle stability. These drawbacks are caused, e.g., by corrosion of cathode current collector, exfoliation of the active material layer, and the narrow electrochemical stability window of aqueous electrolytes.

Zhiguo Hou, Jiangsu University of Technology, Changzhou, China, and colleagues have developed high-performance rechargeable aqueous Li+/Na+ hybrid ion batteries that provide a high energy density and a long cycle life. The batteries are based on LiMn2O4 cathodes, NaTi2(PO4)3 anodes, and an aqueous LiClO4/NaClO4 electrolyte with urea as an additive. The team developed a new corrosion-resistant, light-weight, and low-cost graphite- and carbon-nanotube (GCN)-coated nylon membrane to be used as the cathode current collector.

The carbon nanotubes and the graphite in the current collector provide electrical conductivity, and the nylon provides mechanical strength. The material ensures good adhesion between the active materials layer and the current collector (pictured). The urea additive in the electrolyte undergoes an electrochemical reaction to form an insoluble product, which is deposited on surfaces of the electrodes and substantially improves the electrochemical stability window of the electrolyte. The battery provides a high energy density of 95 Wh kg−1 and has excellent stability up to 10,000 charge/discharge cycles.



Article Views: 2825

Sign in Area

Please sign in below

Additional Sign In options

Please note that to comment on an article you must be registered and logged in.
Registration is for free, you may already be registered to receive, e.g., the newsletter. When you register on this website, please ensure you view our terms and conditions. All comments are subject to moderation.

Article Comments - To add a comment please sign in

If you would like to reuse any content, in print or online, from, please contact us first for permission and consult our permission guidance prior to making your request

Follow on Facebook Follow on Twitter Follow on YouTube Follow on LinkedIn Follow on Instagram RSS Sign up for newsletters

Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH