Optimized Cathode for High‐Energy Sodium‐Ion Based Dual‐Ion Full Battery with Fast Kinetics

Abstract

The most used systems based on the graphite‐based cathode show unsatisfactory performance in dual‐ion batteries. Developing new type cathode materials with high capacity for new type anions storage is an effective way to improve the total performance of dual‐ion batteries. Herein, a protonated polyaniline (P‐PANI) cathode is prepared to realize efficient and stable storage of ClO4–, and a high reversible capacity of 143 mAh g−1 at 0.2 A g−1 after 200 cycles can be obtained, which is competitive compared with common graphite cathodes. In addition, the highly reversible coordination storage mechanism between ClO4− and P‐PANI cathode is indicated, rather than the labored intercalation reactions between PF6− and graphite. Subsequently, a full cell (P‐PANI//N‐PDHC) fabricated with a P‐PANI cathode and hard carbon anode (N‐PDHC) can deliver a high energy density of 284 Wh kg–1 for 2000 cycles at 2 A g–1, and the relevant pouch‐type full cell can easily power a smartphone. In general, this work may promote the exploitation of sodium‐based dual‐ion batteries in practical application.

Interlayer engineering of a V2O5 anode toward high-rate and durable dual-ion batteries

“…These CV curves revealed two anode and two cathode peaks, which signified a multistep anion and cation intercalation/deintercalation process. A high coincidence of these CV curves could be identified, indicating a good reversibility and stability during anion and cation inter- 18,[57][58][59][60][61][62][63][64][65][66] and (e) cycling performance; inset is the selected charge and discharge curves. calation/deintercalation.…”

Fluorination Treatment of Conjugated Protonated Polyanilines for High‐Performance Sodium Dual‐Ion Batteries

“…While Figure S16 displays the fitted b values for PHC, FPC and PANI/CNT for comparison. Quantitative analysis for capacitance contribution can be through the equation: [20] i…”

Fixture-free omnidirectional prestretching fabrication and integration of crumpled in-plane micro-supercapacitors

“…At the same time, imaginary capacitance is associated with some irreversible consumption process, and short relaxation time constant ( 0 = 1/f) calculated in C″ of 80% strain MSC is further supported by its rapid transportation of charge and fast electrode polarization (35)(36)(37), leading to the enhanced ion diffusion (fig. S14) (38) and energy/ power densities (0.38 mW cm −2 /1.4 mWh cm −2 ; fig. S15A).…”