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Constructing hierarchical heterojunction structure for K/Co co-substituted Na3V2(PO4)3 by integrating carbon quantum dots.
Tian, Zeyi; Chen, Yanjun; Sun, Shiqi; Liu, Honglang; Wang, Chao; Huang, Que; Liu, Changcheng; Wang, Yanzhong; Guo, Li.
Afiliación
  • Tian Z; School of Materials Science and Engineering, North University of China, Taiyuan, China; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China.
  • Chen Y; School of Materials Science and Engineering, North University of China, Taiyuan, China; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China. Electronic address: yjchen@nuc.edu.cn.
  • Sun S; School of Materials Science and Engineering, North University of China, Taiyuan, China; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China.
  • Liu H; School of Materials Science and Engineering, North University of China, Taiyuan, China; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China.
  • Wang C; School of Materials Science and Engineering, North University of China, Taiyuan, China; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China. Electronic address: wangchao_nuc@126.com.
  • Huang Q; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China; School of Environment and Safety Engineering, North University of China, Taiyuan, China.
  • Liu C; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China; School of Environment and Safety Engineering, North University of China, Taiyuan, China.
  • Wang Y; School of Materials Science and Engineering, North University of China, Taiyuan, China; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China.
  • Guo L; Advanced Energy Materials and Systems Institute, North University of China, Taiyuan, China. Electronic address: guoli@nuc.edu.cn.
J Colloid Interface Sci ; 613: 536-546, 2022 May.
Article en En | MEDLINE | ID: mdl-35063785
Na3V2(PO4)3 (NVP) has been widely adopted as cathode in sodium ion battery devices. Nevertheless, the weak intrinsic conductivity and serious structural collapse limit the further development. Herein, a simultaneous modified strategy of doping K/Co and integrating carbon quantum dots (CQD) is proposed. Substituting K+ is beneficial to afford amount of Na+ transport within the stabled and expanded lattice. The introduction of Co2+ generates beneficial hole carriers to improve conductivity. Furthermore, the bonding of conductive CQD guides to obtain nano-sized NVP grains, reducing the pathway for ionic migration to accelerate the diffusion capability. Importantly, a unique p-n type heterojunction construction is established in the interface between CQD (n-type) and NVP (p-type). This heterojunction structure enhances the mobility of electrons owing to the free pathways, in which the electrons transport in a relatively lower energy level without the scatter and collision of anions dopants. Ultimately, K0.1Na2.95V1.95Co0.05(PO4)3@CQD exhibits with the best energy output level. It's initial capacity under 5C is 109.8 mA h g-1 and the retention is 87.6% after cycle 400 cycles. Even at 20 and 50C, its output is 93.5 and 82.6 mA h g-1 for 1st and 66.6 and 52.1 mA h g-1 for 1000th cycle, respectively. Finally, an asymmetric full cell test confirms its application practically.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: J Colloid Interface Sci Año: 2022 Tipo del documento: Article País de afiliación: China Pais de publicación: Estados Unidos