Fe-doped layered P3-type K0.45Mn1−xFexO2 (x ≤ 0.5) as cathode materials for low-cost potassium-ion batteries

Suppressing the Jahn–Teller Effect in Mn‐Based Layered Oxide Cathode toward Long‐Life Potassium‐Ion Batteries

“…[1][2][3][4] Nonetheless, the structural disorder and a strong strain in the structure. [22][23][24] In addition, during the charging and discharging processes, Mn valence will fluctuate between +3 and +4, introducing repeated removal and restoration of Jahn-Teller distortion, which causes the irreversible multiphase transition. [24][25][26][27] Therefore, the structural instability ascribed to serious Jahn-Teller distortion of massive trivalent manganese is the main source for the rapid capacity fading in the Mn-based layered oxides.…”

Potassium-ion batteries: outlook on present and future technologies

“…Myung et al 69 also designed a similar P2-K0.75[Ni1/3Mn2/3]O2 cathode material via electrochemical ion-exchange from P2-Na0.75[Ni1/3Mn2/3]O2, which exhibited an unexpectedly high reversible capacity of about 91 mAh g -1 (1400 mA g -1 ) with excellent capacity retention of 83% over 500 cycles. Recently, other transition metal elements substituted layered manganese oxides, such as Fe-doped layered P3-type K0.45Mn1-xFexO2 (x ≤ 0.5), were also developed as low-cost promising cathode materials for high-performance PIBs 70 . In addition, the introduction of alkali elements might also be an effective way to enhance their electrochemical K storage properties.…”

Ball‐Milling Strategy for Fast and Stable Potassium‐Ion Storage in Antimony‐Carbon Composite Anodes

“…[1,2] Recently, potassium-ion batteries (PIBs) are emerging as promising alternatives to LIBs owing to the high earth abundance (~15000 ppm), high availability and low cost of potassium resources. [3][4][5][6][7] Besides, PIBs share the similar "rocking chair" mechanism and close redox potential (À 2.93 V vs. K/K + ) with LIBs (À 3.04 V vs. Li/Li + ), showing high practical potentials. [8,9] Moreover, the weaker Lewis acidity of K-ion (vs. Li-ion) correlating with a smaller Stoke's radius indicates a faster K-ion diffusion rate in the electrolyte and consumes less energy during the de-solvation process at the electrolyte/electrode interface.…”