ELECTROCHEMICAL PERFORMANCES OF COMPOSITE CATHODE MATERIALS Li1.2Ni0.17Co0.10Mn0.53O2 and Li1.2Ni0.2Mn0.6O2. (10th September 2016)

• Record Type: Journal Article
• Authors: Lanina, Е.V.; Zhuravlev, V.D.; Еrmakova, L.V.; Petrov, А.N.; Pachuev, А.V.; Sheldeshov, N.V.
• Is Part Of: Electrochimica acta. Volume 212(2016)
• Page Start: 810
• Page End: 821
• Publication Date: 2016-09-10
• Subjects: lithium-ion batteries -- composite cathode materials -- phase composition -- electrochemical impedance -- kinetic parameters; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.07.010
• Languages: English
• ISSNs: 0013-4686

Abstract

Highlights: The composite materials Li1.2Ni0.17Cо0.10Mn0.53O2 and Li1.2Mn0.6Ni0.2O2 comprise a mixture of primary solid solutions. The discharge specific characteristics of the materials correspond to 230–250 mAh g−1 after 30 charge–discharge cycles. The Li+ diffusion coefficients in the materials are mainly in the range of 10−14–10−18 cm2 s−1 at potentials of 3–4.7 V. Abstract: The structural, morphological and electrochemical characteristics of the composite cathode materials Li1.2 Ni0.17 Cо0.10 Mn0.53 O2 and Li1.2 Mn0.6 Ni0.2 O2 have been investigated. Solution combustion synthesis has been used as the synthesis method. After heat treatment the average size of particle aggregates in both cathode materials was 5.9–6.5 μm. X-ray diffraction analysis shows that Li1.2 Ni0.17 Cо0.10 Mn0.53 O2 and Li1.2 Mn0.6 Ni0.2 O2 consist of a mixture of primary substitutional solid solutions based on phases with an α-NaFeO2 and Li2 MnO3 or an α-NaFeO2, Li2 MnO3 and LiMn2 O4 structure. The discharge specific characteristics of these materials are characterized by values of 230–250 mAh g −1 . By using electrochemical impedance it was determined that the charge transfer resistance in the investigated materials is by an order of magnitude higher than that in the monophase layered materials of an α-NaFeO2 type. The following kinetic parameters were determined: the diffusion coefficient Li +, the energy barrier at Li + migration through the solid electrolyte interphase, and the activation energy of the intercalation/deintercalation reaction.