期刊
ENERGY STORAGE MATERIALS
卷 39, 期 -, 页码 287-293出版社
ELSEVIER
DOI: 10.1016/j.ensm.2021.04.030
关键词
Thick electrode; phase inversion; low tortuosity; rate performance; lithium-ion batteries
资金
- National Science Foundation of China [NSAF U1630106, 51577175, 21875237]
- National Key RAMP
- D Program of China [2018YFB0905400]
The study presents a novel strategy for constructing thick electrodes towards high energy density LIBs, by preparing ultrahigh-capacity thick LiFePO4 (UCT-LFP)-based freestanding electrodes with vertically-aligned channels. The electrodes show superior rate capability and cycling performance.
Thick electrode design with a high mass loading of active materials is a promising strategy to increase the energy density of lithium-ion batteries (LIBs). However, the development toward thick electrode is severely limited by electrode mechanical instability and sluggish electronic/ionic transport (causing especially rate capability). Herein, ultrahigh-capacity thick LiFePO4 (UCT-LFP)-based freestanding electrodes with vertically-aligned channels are prepared by a phase inversion method. Their porous yet conductive matrix provides the high electronic conductivity and facilitates the permeation of liquid electrolyte, while the unique vertically-aligned micro-channels serve as the fast ion/electron transport pathways. Consequently, the UCT-LFP electrode with a high mass loading of 20 mg cm(-2) shows a superior rate capability (110 mA h g(-1) at 10 C) and an enhanced cycling performance. Notably, an ultra-thick LFP electrode (1.3 mm thick) with a remarkably high areal capacity (15.1 mA h cm(-2)) has been successfully achieved. This study provides a novel strategy for constructing thick electrodes toward high energy density LIBs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据