尖晶石
材料科学
水溶液
锂(药物)
离子
钠
无机化学
化学工程
硫酸盐
硫酸锂
物理化学
有机化学
冶金
离子键合
化学
医学
工程类
内分泌学
作者
Shiqiang Zhong,Yongcong Huang,Fangchang Zhang,Hongzhi Wang,Peiwen Liu,Jingwei Liu,Zhiqiang Li,Yingzhi Li,Zhouguang Lu
标识
DOI:10.1002/adfm.202414602
摘要
Abstract Spinel LiMn 2 O 4 (LMO) has several beneficial properties for utilization as a cathode material for lithium‐ion batteries, including a high operating voltage, thermal stability, low cost, and eco‐friendliness. However, its application is limited by capacity fading due to structural transformation and manganese dissolution upon cycling. A method is proposed to resolve these two issues, using dextran sulfate sodium (DSS) as an aqueous binder to coat the LMO surface. DSS stabilizes the surface/interface structure of LMO by incorporating Na into the interstitial 16c sites, creating a uniform surface coating layer and promoting the formation of a homogeneous and stable cathode‐electrolyte interphase derived from the sulfate groups in DSS and enriched with LiF/LiSO x F. The aqueous DSS binder effectively suppresses the surface degradation and Mn dissolution of spinel LMO. The LMO electrode based on DSS exhibits superior cycling stability and rate performance compared with those of electrodes using the conventional poly(vinylidene difluoride) binder. These findings demonstrate the potential value of DSS as a multifunctional aqueous binder in stabilizing spinel LMO for lithium‐ion batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI