Structural and morphological studies of manganese-based cathode materials for lithium ion batteries

Michalska, Monika; Lipińska, L.; Sikora, Andrzej; Ziółkowska, Dominika A.; Korona, K. P.; Andrzejczuk, Mariusz

doi:10.1016/j.jallcom.2014.12.266

Cited by 21 publications

(13 citation statements)

References 48 publications

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“…Its uniqueness lies in its simplicity. In particular, it is non-toxic, low-cost, easy to prepare, possesses high discharge potential (4.1 V vs. Li metal), and is environmentally friendly compared to other commercially-viable cathode materials, such as layered lithium cobalt (LiCoO 2 ) or lithium nickel (LiNiO 2 ) oxides [ 18 , 19 , 20 , 21 , 22 ]. However, this material has disadvantages, particularly capacity fading during charge-discharge cycles at higher voltages than 4.1 V (vs. Li/Li + ), especially at elevated temperature regions of 50–60 °C, which limits the use of LMO in commercial LiBs [ 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

“…Herein, we present a facile, wet chemical approach based on a simple, wet chemical, low-temperature process of surface modification of LMO grains using graphene oxide flakes. A lithium-manganese oxide powder was first synthesized using a modified sol-gel method [ 20 , 21 , 22 , 23 , 24 , 25 ]. Then, such pre-synthesized LMO powder was coated with GO flakes using a low-temperature process to obtain LMO/GO composites.…”

Section: Introductionmentioning

confidence: 99%

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Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

et al. 2021

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In this work, a facile, wet chemical synthesis was utilized to achieve a series of lithium manganese oxide (LiMn2O4, (LMO) with 1–5%wt. graphene oxide (GO) composites. The average crystallite sizes estimated by the Rietveld method of LMO/GO nanocomposites were in the range of 18–27 nm. The electrochemical performance was studied using CR2013 coin-type cell batteries prepared from pristine LMO material and LMO modified with 5%wt. GO. Synthesized materials were tested as positive electrodes for Li-ion batteries in the voltage range between 3.0 and 4.3 V at room temperature. The specific discharge capacity after 100 cycles for LMO and LMO/5%wt. GO were 84 and 83 mAh g−1, respectively. The LMO material modified with 5%wt. of graphene oxide flakes retained more than 91% of its initial specific capacity, as compared with the 86% of pristine LMO material.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

et al. 2021

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“…Additional advantages of LiMnPO 4 are represented by its low cost, limited environmental impact, and high thermal stability with respect to conventional Co-based oxide cathodes, used in the most common lithium-ion battery configuration [18]. However, many works pointed out the intrinsic slow kinetics of LiMnPO 4 olivine phases [19][20][21], which require careful tuning of the synthetic parameters to produce electrode materials with satisfactory electrochemical performances [22][23][24][25][26][27]. LiMnPO 4 cathode is characterized by: i) electronic conductivity values lower than 10 −9 S cm −1 [20,28]; ii) polaron (electrons and holes) migration barrier higher with respect to LiFePO 4 , both for lithiated and delithiated phases [29]; iii) strong Jahn-Teller deformation of Mn 3+ hindering the LiMnPO 4 delithiation and leading to LiMnPO 4 /MnPO 4 interphase mismatch [19,21].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical features of LiMnPO4 olivine prepared by sol-gel pathway

Lecce

Hassoun

2017

Journal of Alloys and Compounds

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LiMnPO 4 is a potential cathode for lithium-ion battery of high thermal stability, low cost, environmental sustainability and high theoretical energy density. However, this intriguing olivine material suffers from intrinsic sluggish kinetics of lithium (de)insertion, which limits the reversible reaction in practical lithium cells. Herein we report a careful study of the impedance features of LiMnPO 4 during electrochemical reaction in lithium cell. The LiMnPO 4 material is prepared by solgel method and fully characterized by X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). The material shows suitable galvanostatic cycling with a working voltage of about 4.1 V, which is higher than the 3.5 V value expected from the most common olivine material, i.e., LiFePO 4 , however with a low specific capacity. Hence, electrochemical impedance spectroscopy (EIS) is used to study the lithium (de-)insertion within the LiMnPO 4 structure. The results indicate an impedance behavior depending on the state of charge and a lithium diffusion coefficient trend slightly decreasing during Manuscript revised Click here to view linked References cell operation within the 10 −14 − 10 −13 cm 2 s −1 range. The electrochemical study in lithium cell reveals remarkable enhancement of the electrode kinetics at 70°C, which suggests preferred application of LiMnPO 4 materials at the higher temperatures. Highlights

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“…Next to standard 2D surface images, the Sobel transform was provided, as it reveals subtle morphological details. This image processing tool was successfully used in many previous works [55,56,57,58,59,60].…”

Section: Measurementsmentioning

confidence: 99%

Spectroscopic and structural properties of CeO2 nanocrystals doped with La3+, Nd3+ and modified on their surface with Ag nanoparticles

Michalska

Lemański

Sikora

2021

Heliyon

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The purpose of this work is to present our efforts focused on applications of chemical synthesis of nanocrystalline cerium dioxide (CeO 2 ) powders doped with La 3þ ions and CeO 2 :Nd 3þ modified, on their surface, with Ag nanoparticles (NPs). The synthesized powders were examined by X-ray powder diffraction (XRD), absorption, emission spectroscopy, scanning electron (SEM) and atomic force microscopy (AFM). The relations between crystallographic properties and stability of CeO 2 compounds doped by La ions and surface-modified by Ag were studied. XRD patterns revealed that all studied samples are single-phase and crystallized in the cubic fluorite-type structure, in space group Fm-3m. The average crystallite sizes estimated by Rietveld method of series: La-doped CeO 2 were in the range of 7-14 nm, and CeO 2 :1%Nd 3þ /n-Ag (n: 1-5wt.%) were found to be in the range of 29-34 nm, respectively. The lattice parameter a for La-doped CeO 2 powders varying from 5.416 to 5.482 Å with increasing content of La 3þ ions from 0 to 20wt.%, respectively. For series of CeO 2 :Nd 3þ /n-Ag materials lattice parameter a was at the same level and in accordance with the standard value a 0 ¼ 5.411 Å (ICDD -43-1002). The SEM and AFM observations depicted the grainy structure of all obtained CeO 2 -powder samples. The estimated grain size ranged from 50 to 500 nm. The diverse grain shapes and packing was remarked in the samples. According to our knowledge, the relationship between the structural, spectroscopic and morphological characteristics of CeO 2 samples was presented in this work for the first time.

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Structural and morphological studies of manganese-based cathode materials for lithium ion batteries

Cited by 21 publications

References 48 publications

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

Surface Modification of Nanocrystalline LiMn2O4 Using Graphene Oxide Flakes

Electrochemical features of LiMnPO4 olivine prepared by sol-gel pathway

Spectroscopic and structural properties of CeO2 nanocrystals doped with La3+, Nd3+ and modified on their surface with Ag nanoparticles

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