A facile approach to form an artificial CEI layer induced by residual Li compounds on LiNi0.9Co0.05Mn0.05O2 and Li6PS5Cl for all-solid-state batteries

IF 15 1区 工程技术 Q1 ENERGY & FUELS Etransportation Pub Date : 2023-12-21 DOI:10.1016/j.etran.2023.100306
Jaeik Kim , Seungwoo Lee , Hyungjun Lee , Joonhyeok Park , Jaeyeong Lee , Janghun Park , Jeongheon Kim , Jiseok Kwon , Jongsung Jin , Jiung Cho , Ungyu Paik , Taeseup Song
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Abstract

All-solid-state batteries (ASSBs) are attracting significant attention as alternatives to conventional lithium-ion batteries due to their safety and higher energy density. However, electrochemical reactions between the solid electrolytes and active materials result in the degradation of electrochemical cell performances. A conventional approach is to employ protective layers onto the active materials, but this approach could have the drawback of being costly and time-consuming. The artificial cathode electrolyte interphase (CEI) layer generated by reactions between components within the electrode could provide a solution to these challenges. However, this approach can cause component degradation due to its intrinsically degradative nature of the forming process. In this study, we demonstrate the ASSBs with enhanced electrochemical performances by introducing lithium oxy-thiophosphate species (P-Ox-Sy-···Li+, LPOS) and LiCl artificial CEI layer, which could be spontaneously formed during heat treatment by chemical reactions between the solid electrolytes and residual Li compounds on the LiNi0.9Co0.05Mn0.05O2 (NCM) without the degradation. The LPOS-LiCl layer effectively suppresses the side reactions between solid electrolytes and NCM during the repeated electrochemical cyclings. As a result, the NCM full-cell (3.7 mAh cm−2) with the LPOS-LiCl artificial CEI layer exhibits 80.0 % cycle retention after 300 cycles at 0.2 C rate and room temperature. Moreover, it demonstrates 58 % higher Li-ion mobility and 36 % lower internal resistance after cycling compared to the NCM full-cell without the LPOS-LiCl artificial CEI layer.

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在全固态电池用 LiNi0.9Co0.05Mn0.05O2 和 Li6PS5Cl 上形成由残余锂化合物诱导的人工 CEI 层的简便方法
作为传统锂离子电池的替代品,全固态电池(ASSB)因其安全性和更高的能量密度而备受关注。然而,固体电解质和活性材料之间的电化学反应会导致电化学电池性能下降。传统的方法是在活性材料上使用保护层,但这种方法存在成本高、耗时长的缺点。由电极内成分间反应生成的人工阴极电解质间相(CEI)层可以为这些挑战提供解决方案。然而,由于形成过程本身具有降解性,这种方法可能会导致元件降解。在本研究中,我们通过引入锂氧硫磷酸物种(P-Ox-Sy----Li+,LPOS)和氯化锂人工 CEI 层,展示了具有更强电化学性能的 ASSB。在热处理过程中,固体电解质与 LiNi0.9Co0.05Mn0.05O2(NCM)上的残留锂化合物之间会发生化学反应,从而自发形成 LPOS-LiCl 人工 CEI 层,且不会发生降解。在反复的电化学循环过程中,LPOS-LiCl 层有效地抑制了固体电解质与 NCM 之间的副反应。因此,带有 LPOS-LiCl 人工 CEI 层的 NCM 全电池(3.7 mAh cm-2)在 0.2 C 速率和室温条件下循环 300 次后,显示出 80.0% 的循环保持率。此外,与没有 LPOS-LiCl 人工 CEI 层的 NCM 全电池相比,它在循环后的锂离子迁移率提高了 58%,内阻降低了 36%。
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来源期刊
Etransportation
Etransportation Engineering-Automotive Engineering
CiteScore
19.80
自引率
12.60%
发文量
57
审稿时长
39 days
期刊介绍: eTransportation is a scholarly journal that aims to advance knowledge in the field of electric transportation. It focuses on all modes of transportation that utilize electricity as their primary source of energy, including electric vehicles, trains, ships, and aircraft. The journal covers all stages of research, development, and testing of new technologies, systems, and devices related to electrical transportation. The journal welcomes the use of simulation and analysis tools at the system, transport, or device level. Its primary emphasis is on the study of the electrical and electronic aspects of transportation systems. However, it also considers research on mechanical parts or subsystems of vehicles if there is a clear interaction with electrical or electronic equipment. Please note that this journal excludes other aspects such as sociological, political, regulatory, or environmental factors from its scope.
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