Processing mechanism synergizing surface and intercalation pseudocapacitance engineering fast-charging Li-based anode materials

假电容 材料科学 插层(化学) 化学工程 阳极 电化学 导电体 纳米技术 电极 超级电容器 无机化学 复合材料 化学 物理化学 工程类 冶金
作者
Zhuo Chen,Qiming Wang,Shuai Bai,Xi Wang,Wenlie Lin,Yining Zhang
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:659: 463-473 被引量:4
标识
DOI:10.1016/j.jcis.2023.12.135
摘要

Pseudocapacitive material can achieve rapid charge and discharge response. In this study, a vanadium-based conductive network hydrate (Na0.13Mg0.02)V2O5·0.98H2O (NMVO) was designed. The Na+ and Mg2+ in NMVO are sandwiched between two layers of vacancy-ordered prisms and monoclinic nanonetwork V3O7 (VO2:V2O5 = 1:1) to form a conductive network with a layer spacing of up to 11.67 Å, this structure facilitates rapid interlayer diffusion of cations and enhanced conductivity. Reduction-NMVO (r-NMVO) with hierarchical heterostructures was prepared via an in-situ electrochemical process to generate interlayer vanadium-based active sites (LiV3O8, LiV2O5, Na3V3O8, MgVO3) with multi-electron reaction, which enhanced the generation of surface redox pseudocapacitance. The interlayer heterostructure is integrated with the core of the precursor V3O7 to form an active site-rich conductive network with strong pulse impact resistance, which promotes the generation of intercalated pseudocapacitance and increases the cycle stability of the electrode. This intercalation-surface redox pseudocapacitive mechanism was confirmed by first-principles, in-situ, and ex-situ characterization analysis. The r-NMVO|Li battery still maintains a capacity of 95.5 % after 65,500 cycles at a current density of 50 A g−1. These results contribute directly to the realization of stable, fast charge and discharge material design.
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