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Creating an Innovative, Solid, Air Working Battery

Posted on 30 June, 2023 by benyamin chahkandi

Creating an Innovative, Solid, Air Working Battery

Summary: Typically, negative electrodes in batteries are made of active materials like metals. Rechargeable metal-air batteries with oxygen-reducing positive electrodes have recently used redox-active organic compounds, such as quinone- and amine-based molecules, as negative electrodes. Here, the redox reactions involve protons and hydroxide ions. These batteries operate well and are almost at their theoretical maximum capacity. Furthermore, using redox-active organic molecules in rechargeable air batteries eliminates issues with metals, such as the development of "dendrites," which have an adverse effect on battery performance and the environment. These batteries, like metal-based batteries, use liquid electrolytes, which raise serious safety issues due to their high electrical resistance, leaching effects, and flammability.


Now, a team of Japanese researchers has created an all-solid-state rechargeable air battery (SSAB) and examined its capacity and endurance in a new study that was published in Angewandte Chemie International Edition on May 2, 2023. Professors Kenichi Oyaizu and Kenji Miyatake, both from Waseda University and the University of Yamanashi, co-authored the paper under the direction of Professor Kenji Miyatake.

Due to their stable and reversible redox reactions in acidic environments, the researchers selected the chemical 2,5-dihydroxy-1,4-benzoquinone (DHBQ) and its polymer poly(2,5-dihydroxy-1,4-benzoquinone-3,6-methylene) (PDBM) as active materials for the negative electrode. They also used Nafion, a proton-conductive polymer, as the solid electrolyte in place of traditional liquid electrolytes. To the best of my knowledge, no solid polymer electrolyte and organic electrode air batteries exist.

After the SSAB was installed, the researchers experimentally evaluated its cyclability, rate characteristics, and charge-discharge performance. They discovered that the SSAB does not degrade in the presence of water and oxygen, in contrast to conventional air batteries, which use a metallic negative electrode and an organic liquid electrolyte. A superior negative electrode was created by substituting the redox-active chemical DHBQ with its polymeric analog, PDBM. At a constant current density of 1 mAcm-2, the SSAB-PDBM had a per-gram-discharge capacity of 176.1 mAh, compared to the SSAB-DHBQ's 29.7 mAh.


The researchers also discovered that the SSAB-PDBM's coulombic efficiency was 84% at 4 C rate and gradually declined to 66% at 101 C rate. After 30 cycles, the SSAB-PDBM's discharge capacity dropped to 44%, but the researchers were able to significantly increase it to 78% by adding more proton-conductive polymer to the negative electrode. The performance and durability of the PDBM-based electrode were enhanced by the addition of Nafion, according to electron microscopic images.


This study reveals the successful operation of an SSAB made up of an oxygen-reducing, diffusion-type positive electrode, a solid electrolyte made of a proton-conductive polymer, and redox-active organic molecules as the negative electrode. The researchers are hoping that it will open the door for more development. According to Miyatake, "This technology can increase the battery life of small electronic devices like smartphones and eventually help realize a carbon-free society."


source: www.sciencedaily.com/releases/2023/06/230612114704.htm


Today In History

Here are some interesting facts ih history happened on 22 June.

  1. Henry Hudson set adrift in Hudson Bay during mutiny
  2. Royal Greenwich Observatory established in England by Charles II
  3. slavery outlawed in England
  4. 1st Continental currency authorized
  5. British board USS Chesapeake - a provocation leading to War of 1812
  6. Zebulon Pike reaches his peak
  7. 2nd abdication of Napoleon (after Waterloo)
  8. Doughnut invented
  9. Stephen C Massett opens at courthouse as 1st professional entertainer using (allegedly) only piano in Cal
  10. Fire destroys part of SF
  11. Arkansas reenters US
  12. Dept of Justice cabinet-level federal agency founded
  13. Louisville Colonels set major-league baseball record with 26th consecutive loss
  14. 1st airship passengers - Zeppelin Deutscheland
  15. King George V of England crowned
  16. Lou Gehrig hits 3 HRs in a game - Ruth hits 3 in double header
  17. Joe Lewis wins world heavyweight title from James Braddock by KO
  18. Joe Lewis knocks out Max Schmeling in 1st round
  19. France falls to Nazi Germany
  20. Germany declares war on Russia during WW II
  21. FDR signs "GI Bill of Rights" (Servicemen's Readjustment Act)
  22. Congress passes revised organic act for Virgin Islands
  23. KC stops using streetcars in it's transit system
  24. Pres Nixon signs 26th Amendment (voting age 18)
  25. Skylab 2's astronauts land
  26. Walt Disney's "The Rescuers" is released
  27. Former AG John Mitchell starts 19 months in AL prison
  28. Pluto's moon Charon discovered by James Christy
  29. Pro Football Researchers Association founded at Canton - O
  30. Julius Sommer dies of heart failure buried in Dayton Oh
  31. Mark David Chapman pleads guilty to killing Beatle John Lennon
  32. Manhattan institutes bus-only lanes
  33. Prince Chuck & Lady Di take Prince William home from hospital
  34. 1st time a satellite is retrieved from orbit by Space Shuttle
  35. Actor/Dancer Fred Astaire dies
  36. Tom Seaver retires after 3rd try with NY Mets