Affiliation:
1. Beijing Key Laboratory of Environmental Science and Engineering School of Materials Science & Engineering Beijing Institute of Technology Beijing 100081 China
2. Advanced Technology Research Institute Beijing Institute of Technology Jinan 250300 China
3. Collaborative Innovation Center of Electric Vehicles in Beijing Beijing 100081 China
Abstract
AbstractIntercalation‐type reaction that occurs in polyanion materials is considered to be a facile way to counter the mismatched relationship between the large K+ and compact host structure for potassium ion batteries (PIBs). However, the large “dead” weight and poor conductivity introduced by the polyanion framework severely limit the electrochemical performance of polyanion anodes. Herein, a new rigid K+ host of 1D π‐Ti2O(PO4)2 with carbon‐coated (TOP@C) is simply synthesized through a simple Ti3C2Tx‐derived method. The density functional theory (DFT) calculations and experimental results show that the potassium storage properties are unquestionably improved by the small cell volume change during cycling, the intercalation pseudo‐capacitance energy storage mechanism, and the large K‐storage tunnels with lower migration energy (0.23 eV) of TOP@C anode (134.5 mAh g‐1 after 2000 cycles at 1.0 A g‐1). The TOP@C//PTCDA full batteries, which clearly illustrate their promising application in advanced PIBs, successfully achieved a high energy density of 119.4 Wh kg‐1 and a power density up to 632.8 W kg‐1 with regard to the total mass of TOP@C and PTCDA.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Beijing Municipality
China Postdoctoral Science Foundation
Subject
Electrochemistry,Condensed Matter Physics,Biomaterials,Electronic, Optical and Magnetic Materials
Cited by
7 articles.
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