Exploring the Surface Kinetic and Electrochemical Behaviors of the Cathode Material Modified with Safety Additives in Lithium-Ion Batteries

作     者：Alemu, Tibebu Wang, Fu-Ming Kerayu, Bulti Abdisa 

作者机构：Department of Chemistry College of Natural and Computational Science Ambo University Oromia P.O.Box. 19 Ambo Ethiopia Graduate Institute of Applied Science and Technology Taipei10607 Taiwan Sustainable Energy Center National Taiwan University of Science and Technology Taipei10607 Taiwan Department of Chemical Engineering Taoyuan32023 Taiwan R&D Center for Membrane Technology Chung Yuan Christian University Taoyuan32023 Taiwan 

出 版 物：《SSRN》 

年 卷 期：2024年

核心收录：

主　　题：Lithium ion batteries 

摘      要：The safety of lithium-ion batteries (LIBs) particularly in a charged state should be greatly improved by inhibiting the oxygen evolution at electrode surface. The main objective of this study is exploring the surface kinetic and electrochemical behavior of safety additives modified LiNi0.6Co0.2Mn0.2O2 (NMC) cathode material. Two additives (Polymer A and polymer B) are synthesized for the mitigation of thermal runaway without reducing battery performance. The optical measurement reveals that polymer B enhances the generation of peak at larger resonance angle. The accretions of surface heating temperature trigger increased binding constant from 2.7x104 to 4.8x104 M-1s-1. The results demonstrated that the superior irreversible capacity of Sample B ascribed to impeding Li+ transfer because of high cross-linked polymer B whereas, polymer A possibly initiates electrochemical self-polymerization and heating temperatures. Consequently, it forms a secondary protection layer and reduced the heat released from 319 to 110 Jg-1. The soft XAS revealed that upon fully charging the batteries, the un-reacted –NH group of polymer A contributed to spectral changes in sample A. Therefore, owing to the presence of – NH group, the cathode material treated with polymer A could undergo electrochemical reactions in first cycle and form secondary protective layer improved thermal stability and electrochemical performance comparing with cathode modified with polymer B. Therefore, this study investigated the development of optimum and appropriate working conditions for the better batteries performance and its safety. © 2024, The Authors. All rights reserved.