Polypyrrole-coated sodium manganate microspheres cathode for superior performance Sodium-ion batteries.

Autor: Zhang P; School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China., Weng J; School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China. Electronic address: wengjy0712@163.com., Lu Z; School of Mechanical Engineering, Shandong University of Technology, Zibo 255000, PR China., Li L; School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 0255000, PR China., Ji B; School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 0255000, PR China., Ding M; School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China., Sun Y; School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 0255000, PR China., Yuan W; School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China., Zhou P; School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 0255000, PR China., Cong H; School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, PR China. Electronic address: conghailin@sdut.edu.cn.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2024 Nov 15; Vol. 674, pp. 428-436. Date of Electronic Publication: 2024 Jun 26.
DOI: 10.1016/j.jcis.2024.06.197
Abstrakt: P2-Na 0.67 Mn 0.67 Ni 0.33 O 2 is a promising cathode material for sodium ion batteries (SIBs) due to its low cost, high theoretical capacity, and non-toxicity. However, it still suffers from unsatisfactory cycling stability mainly incurred by the Jahn-Teller effect of Mn 3+ and electrolyte decomposition on the electrode/electrolyte interface. Herein, the P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 @PPy (NNMO@PPy) composite applied as cathode materials for SIBs is obtained by introducing conductive polypyrrole (PPy) as coating layer on the P2-Na 0.67 Ni 0.33 Mn 0.67 O 2 (NNMO) microspheres. Numerous physical characterization methods indicate that the PPy layer was uniformly coated on the surface of NNMO microspheres without change in phase structure and morphology. The PPy coating layer can alleviate Mn dissolution and effectively suppress the side reactions between the electrolyte and electrode during cycling. The optimal NNMO@PPy-9 with 9 wt% PPy delivers a high capacity of 127.4 mAh/g at the current density at 150 mA g -1 , an excellent cyclic stability with high capacity retention of 80.5 % after 300 cycles, and enhanced rate performance (169.3 mAh/g at 15 mA g -1 while 89.8 mAh/g at 600 mA g -1 ). Furthermore, hard carbon (-)//NNMO@PPy-9 (+) full cell delivers a high energy density of 305.1 Wh kg -1 and superior cycling stability with 88.2 % capacity retention after 150 cycles. In-situ X-ray diffraction experiment and electrochemical characterization verify the highly reversible structure evolution and robust P2-type phase structure of NNMO@PPy-9 for fast and stable Na + diffusion. This effective strategy of using conductive PPy as a coating layer may provide a new insight to modify NNMO surface, improving the cycling stability and rate capability.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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