材料科学
尖晶石
电化学
水溶液
阴极
相(物质)
锂(药物)
电解质
化学工程
扩散
无机化学
冶金
热力学
物理化学
电极
物理
工程类
内分泌学
有机化学
化学
医学
作者
Jiarong He,Georgian Melinte,Mariyam Susana Dewi Darma,Weibo Hua,Chittaranjan Das,Alexander Schökel,Martin Etter,Anna–Lena Hansen,Liuda Mereacre,Udo Geckle,Thomas Bergfeldt,Zhipeng Sun,Michael Knapp,Helmut Ehrenberg,Julia Maibach
标识
DOI:10.1002/adfm.202207937
摘要
Abstract LiNi 0.5 Mn 1.5 O 4 (LNMO) is a promising cathode in lithium‐ion batteries (LIBs) due to its high operating voltage and open Li + diffusion framework. However, the instability of the electrode–electrolyte interface and the negative environmental impact of electrode fabrication processes limit its practical application. Therefore, switching electrode processing conditions to aqueous and understanding the accompanying surface structural evolution are imperative. Here, water‐treated, poly(acrylic acid) (PAA)‐treated, and H 3 PO 4 ‐treated LNMO, labeled as W‐LNMO, A‐LNMO, and H‐LNMO, are studied systematically. W‐LNMO shows a high concentration of Mn 3+ induced by Li loss while a conformal PAA layer formed on A‐LNMO reduces this phenomenon. H‐LNMO displays a second MnPO 4 ∙H 2 O phase. Upon cycling, a fast capacity decay is observed in W‐LNMO while an extra plateau at ≈2.7 V appears in the initial charging, corresponding to a two‐phase transition. A surface reconstruction layer from a spinel to a rock‐salt phase with a reductive Mn 2+ segregation is observed in W‐LNMO after 105 cycles. The PAA layer persists on A‐LNMO and alleviates the capacity decay. H‐LNMO delivers a relatively low capacity due to the formation of a MnPO 4 ∙H 2 O phase. This study provides new insights into manipulating the surface chemistry of LNMO cathodes to enable aqueous, large‐scale processingin LIBs.
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