Stability of Thin-Film Lithium-Ion Rechargeable Batteries Fabricated by Sputtering Method without Heating
Year: 2014
Type: article
Abstract: Using only a nonheating sputtering method, all-solid-state thin-film lithium-ion rechargeable batteries composed of a Li 2 Mn 2 O 4 positive electrode, Li 4 Ti 5 O 12 negative electrode, and Li 3 PO 4-x N x electrolyte were fabricated, and the stability of their electrochemical characteristics and microstructures toward charge-discharge cycling was investigated. The charge-discharge curve retained a stable S-shaped profile for the batteries with a thinner negative electrode layer, while it changed from an S-shaped profile to a two-step profile for the batteries with a thicker negative electrode layer. Transmission electron microscopy (TEM) confirmed that the diffraction rings assigned to a LiMn 2 O 4 spinel structure sharpened after charge-discharge cycling, suggesting that more crystalline grains increased in the positive electrode during cycling. On the other hand, it was found that the shape of the interfaces of each layer was sharp and clear, and each layer nearly retained its initial structure after 100 charge-discharge cycles. Moreover, the batteries displayed stable cycle performance over more than 10000 charge-discharge cycles. The present low-temperature fabrication process may represent a great advancement in practical battery production.
DOI: 10.1149/2.0491503jes
Institutions: Geomatec Co., Ltd. (Japan), Iwate University
Language: English
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2054636043