AI Article Synopsis
- Potassium is abundant like sodium, but K-ion battery development is hindered by potassium's larger mass and ionic size, making it hard to find effective high-voltage cathode materials.* -
- The proposed potassium cathode, cyanoperovskite KMnFe(CN), has desirable voltage plateaus at 3.6 V and a theoretical capacity of 156 mAh g, utilizing the cheap and eco-friendly metals manganese and iron.* -
- The cathode demonstrates a commendable specific capacity of 142 mAh g using an inexpensive preparation method, making it viable for large-scale electricity storage solutions.*
Article Abstract
Potassium has as rich an abundance as sodium in the earth, but the development of a K-ion battery is lagging behind because of the higher mass and larger ionic size of K than that of Li and Na, which makes it difficult to identify a high-voltage and high-capacity intercalation cathode host. Here we propose a cyanoperovskite KMnFe(CN) (0 ≤ x ≤ 2) as a potassium cathode: high-spin Mn/Mn and low-spin Fe/Fe couples have similar energies and exhibit two close plateaus centered at 3.6 V; two active K per formula unit enable a theoretical specific capacity of 156 mAh g; Mn and Fe are the two most-desired transition metals for electrodes because they are cheap and environmental friendly. As a powder prepared by an inexpensive precipitation method, the cathode delivers a specific capacity of 142 mAh g. The observed voltage, capacity, and its low cost make it competitive in large-scale electricity storage applications.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/jacs.6b12598 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!