Superlithiated Polydopamine Derivative for High-Capacity and High-Rate Anode for Lithium-Ion Batteries

Affiliation of Author(s):材料科学与技术学院

Journal:ACS Appl. Mater. Interfaces

Abstract:Organic electrode materials, with low-cost synthesis and environmental friendliness, have gained significant research interest in lithium-ion batteries (LIBs). Polydopamine (PDA), as a bioderived organic electrode material, exhibits a low capacity of ∼100 mAh g-1, greatly limiting the practical application in LIBs. In this work, we find that a simple heat treatment at 300 °C can endow PDA-derived material (PDA300) with superior electrochemical performance. The obtained PDA300 electrode exhibits an ultrahigh capacity of 977 mAh g-1 at 50 mA g-1. Further combining the PDA300 with highly conductive Ti3C2Tx MXene, the obtained PDA300/Ti3C2Tx composite is demonstrated by high capacity (1190 mAh g-1, 50 mA g-1), excellent rate capability (remaining 552 mAh g-1 at 5 A g-1), and good cycling stability (82% retaining after 1000 cycles). The outstanding lithium storage performance is highly associated with the superlithiation process of the unsaturated carbon-carbon bonds in the PDA derivative and the introduction of the highly conductive Ti3C2Tx substrate with a unique two-dimensional nanostructure. This work will provide new opportunities for the expansion of high-performance organic anodes for LIBs. © Copyright 2018 American Chemical Society.

Note:v 10,n 44,p38101-38108

ISSN No.:1944-8244

Translation or Not:no

Date of Publication:2018-11-07

Date of Publication:2018-11-07