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Dynamic phase transition behavior of a LiMn_(0.5)Fe_(0.5)PO_(4) olivine cathode material for lithium-ion batteries revealed through in-situ X-ray techniques

查看全文 作　　者：Sujeera [1]Pleuksachat;Phongsit [1]Krabao;Sarawut [2]Pongha;Viyada [1]Harnchana;Pawinee [1]Klangtakai;Wanwisa [2]Limphirat;Siriwat [3]Soontaranon;Jeffrey [2]Nash;Nonglak [1,2]Meethong 高影响力作者 机构地区：[1]Department of Physics,Faculty of Science,Khon Kaen University,Khon Kaen 40002,Thailand;[2]Institute of Nanomaterials Research and Innovation for Energy(IN-RIE),Research Network of NANOTEC-KKU(RNN),Khon Kaen University,Khon Kaen 40002,Thailand;[3]Synchrotron Light Research Institute(SLRI),Nakhon Ratchasima 30000,Thailand高影响力机构 出　　处：《Journal of Energy Chemistry》索引2022年第31卷第8期,共9页高影响力期刊 基　　金：the Science Achievement Scholarship of Thailand(SAST)for financial support;partially supported by the Institute of Nanomaterials Research and Innovation for Energy(IN-RIE);the Research and Graduate Studies,Khon Kaen University(KKU);Synchrotron Light Research Institute(SLRI),Thailand。 摘　　要：LiMn_(0.5)Fe_(0.5)PO_(4) has attracted great interest due to its good electrochemical performance and higher operating voltages.This has led to a greater than 30 percent higher energy density than for commercial Li Fe PO4 olivine cathodes.Understanding the phase transition behaviors and kinetics of this material will help researchers to design and develop next generation cathodes for Li-ion batteries.In this study,we investigated non-equilibrium phase transition behaviors in a LiMn_(0.5)Fe_(0.5)PO_(4) cathode material during charge–discharge processes by varying current rates(C-rates)using synchrotron in-situ X-ray techniques.These methods included wide angle X-ray scattering(in-situ WAXS)and X-ray absorption spectroscopy(in-situ XAS).The WAXS spectra indicate that the phase transition of LiMn_(0.5)Fe_(0.5)PO_(4) material at slow C-rates is induced by a two-phase reaction.In contrast,at a high C-rate(5 C),the formation of an intermediate phase upon discharge is clearly observed.Concurrently,the oxidation numbers of the redox reactions of Fe^(2+)/Fe^(3+)and Mn^(2+)/Mn^(3+)were evaluated using in-situ XAS.This combination of synchrotron in-situ X-ray techniques gives clear insights into the non-equilibrium phase transition behavior of a LiMn_(0.5)Fe_(0.5)PO_(4) cathode material.This new understanding will be useful for further developments of this highly promising cathode material for practical commercialization. 关 键 词：LiMn_(0.5)Fe_(0.5)PO_(4) Phase transition In-situ X-ray techniques
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