材料科学
电解质
电极
工作职能
锂(药物)
离子
分解
工作(物理)
无机化学
化学工程
纳米技术
有机化学
物理化学
机械工程
图层(电子)
化学
内分泌学
工程类
医学
作者
Jeehye Byun,Chae Rim Lee,Wontak Kim,Min A Lee,Ho Yeon Jang,Chihyun Hwang,Jun Song,Ji‐Sang Yu,Seoin Back,Ki Jae Kim,Hyun‐seung Kim
标识
DOI:10.1002/adfm.202401620
摘要
Abstract The persistent decomposition of electrolytes on graphite and silicon electrodes in lithium‐ion batteries (LIBs) is typically mitigated by the formation of a solid electrolyte interphase (SEI). However, the inadequate formation and chemo‐mechanical degradation of SEI leads to re‐exposure of electrode to electrolyte, contributing to the deterioration of LIBs. To address this issue, tris (2,4‐pentanedionato)indium(III) (InAc) is incorporated into the work function tailoring additive. While conventional additives strengthen the chemo‐mechanical properties of SEI through compositional modifications derived from specific elements, InAc uniquely alters charge transfer across the electrode surface, facilitated by high or low work function layer. This additive establishes an interlayer between the SEI and graphite/SiO surfaces, attributed to its tailored lowest unoccupied molecular orbital energy level. Consequently, the exposure of graphite surface to the electrolyte is minimized by interlayer during cycling. The interlayer possesses a higher work function than lithiated graphite and suppresses further electrolyte decomposition on graphite. In contrast, the interlayer on SiO decreases work function of SiO surface, which promotes the formation of inorganic SEI on SiO. Hence the degradation of SEI is suppressed with LiIn layer at SiO electrode. This leads to a reduction in the ongoing accumulation of SEI, thereby enhancing durability of LIBs.
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