Gas swelling behaviour at different stages in Li4Ti5O12/LiNi1/3Co1/3Mn1/3O2 pouch cells

JOURNAL OF POWER SOURCES

卷:369

Article

Liu, Wei^1,2,3  Liu, Haohan^1,2  Wang, Qian³  Zhang, Jian³  Xia, Baojia³  Min, Guoquan^1,2 

[1] Shanghai Ind Technol Inst, Lithium Ion Battery Innovat Ctr, Shanghai 201206, Peoples R China

[2] Shanghai Nanotechnol Promot Ctr, Nanotechnol Lab, Shanghai 200237, Peoples R China

[3] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Shanghai 200050, Peoples R China

关键词: Lithium titanate;    Pouch cell;    X-ray absorption near edge;    Gas swelling;   

DOI  :  10.1016/j.jpowsour.2017.10.001

来源: Elsevier

【 摘 要 】

Gas swelling behaviour is a major drawback of batteries that are based on Li4Ti5O12 anode materials and hinders their application. In this article, the morphology and electronic structure changes of Li4Ti5O12 electrodes at ageing and cycling stages are investigated using scanning electron microscopy, X-ray absorption near-edge structure and X-ray photoelectron spectroscopy. A simple method that uses an air bag to collect the generated gases was conducted and the gases were then characterised by gas chromatography/mass spectrometry. The results indicate that the charge transformation of Ti ions would aggravate the gas swelling behaviour. The solid electrolyte interphase (SEI) films form on the surface of the Li4Ti5O12 particles and become thicker with increasing charge state. The gas components change significantly during the ageing and cycling, indicating the complexity of the gas swelling mechanism. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free