Mesoporous silica-assisted carbon free Li2MnSiO4cathode nanoparticles for high capacity Li rechargeable batteries

Kim, Sue Jin; Suk, Jungdon; Yun, Young Soo; Jung, Ha‐Kyun; Choi, Sungho

doi:10.1039/c3cp53436g

Cited by 15 publications

(12 citation statements)

References 31 publications

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“…The powder X‐ray diffraction (XRD) pattern of as‐prepared Li 2 MnSiO 4 /C (Figure b) shows that all reflections could be indexed on the basis of an orthorhombic structure with the space group Pmn2 1 , except for a very small MnO peak at 31° as reported by many other groups. [21c], Elemental analysis of the sample by the inductively coupled plasma analysis (ICP) shows a Li:Mn ratio of 1.93:1, indicating a small fraction of lithium evaporation during the pyrolysis at 700 °C. The carbon content in the composite was determined to be ≈20 wt% by thermogravimetric analysis (TGA) under air (Figure S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

Nanostructured Li₂MnSiO₄/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries

Manthiram

2014

Adv Funct Materials

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Li2MnSiO4/C nanocomposite with hierarchical macroporosity is prepared with poly(methyl methacrylate) (PMMA) colloidal crystals as a sacrificial hard‐template and water‐soluble phenol‐formaldehyde (PF) resin as the carbon source. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses confirm that the periodic macropores are ≈400 nm in diameter with 20–40 nm walls comprising Li2MnSiO4/C nanocrystals that produce additional large mesopores (< 30 nm) between the nanocrystals. The nanostructured Li2MnSiO4/C cathode exhibits a high reversible discharge capacity of 200 mAh g−1 at C/10 (16 mA g−1) rate at 1.5–4.8 V at 45 °C. Although the discharge capacity can be further increased on operating at 55 °C, the sample exhibits a relatively fast capacity fade at 55 °C, which can be partially solved by simply narrowing the voltage window to avoid side reactions of the electrolyte. The good performance of the Li2MnSiO4/C cathodes is attributed to the unique macro‐/mesostructure of the silicate coupled with uniform carbon coating.

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Section: Resultsmentioning

confidence: 99%

Nanostructured Li₂MnSiO₄/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries

Manthiram

2014

Adv Funct Materials

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“…Another key member of the silicate family is Li 2 MnSiO 4 , which has a high theoretical capacity of 333 mAh g −1 based on the Mn 2+ /Mn 3+ /Mn 4+ redox couples 59. Li 2 MnSiO 4 exhibits a number of different structures, namely, orthorhombic forms ( Pmn 2 1 and Pmn b) with two‐dimensional pathways for Li‐ion diffusion and monoclinic forms ( P 2 1 /n and P n) with Li‐ion pathways that are interconnected in three dimensions 60.…”

Section: Multi‐electron Reactions In Libs and Nibsmentioning

confidence: 99%

Advanced High Energy Density Secondary Batteries with Multi‐Electron Reaction Materials

et al. 2016

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Secondary batteries have become important for smart grid and electric vehicle applications, and massive effort has been dedicated to optimizing the current generation and improving their energy density. Multi‐electron chemistry has paved a new path for the breaking of the barriers that exist in traditional battery research and applications, and provided new ideas for developing new battery systems that meet energy density requirements. An in‐depth understanding of multi‐electron chemistries in terms of the charge transfer mechanisms occuring during their electrochemical processes is necessary and urgent for the modification of secondary battery materials and development of secondary battery systems. In this Review, multi‐electron chemistry for high energy density electrode materials and the corresponding secondary battery systems are discussed. Specifically, four battery systems based on multi‐electron reactions are classified in this review: lithium‐ and sodium‐ion batteries based on monovalent cations; rechargeable batteries based on the insertion of polyvalent cations beyond those of alkali metals; metal–air batteries, and Li–S batteries. It is noted that challenges still exist in the development of multi‐electron chemistries that must be overcome to meet the energy density requirements of different battery systems, and much effort has more effort to be devoted to this.

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“…3,4 Moreover, Li 2 MSiO 4 compounds having a polyanionic structure offer higher stability compared with conventional lithium transition metal oxides such as LiCoO 2 , LiMn 2 O 4 , and LiNi 1/3 Co 1/3 Mn 1/3 O 2 because the oxygen ions are bound by strong covalent bonds. 5 Li 2 MnSiO 4 -based materials have been intensively studied [6][7][8][9][10][11][12][13][14][15][16][17][18][19] as Li 2 MnSiO 4 is expected to demonstrate a higher discharge capacity than Li 2 FeSiO 4 and Li 2 CoSiO 4 , owing to the extraction of two lithium ions at lower potentials (4.1 and 4.5 V corresponding to the Mn 2+/3+ and Mn 3+/4+ redox couples, respectively). 1 To improve the discharge capacity of Li 2 MnSiO 4 , many researchers have focused on cation doping, 13,23 carbon coating, 16,24,25 and reducing the particle size.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Energy Density of Li2MnSiO4/C Cathode Materials for Lithium-ion Batteries through Mn/Co Substitution

Yamashita

Ogami²,

Kanamura

2018

Electrochemistry

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The crystal structure, morphology, and galvanostatic cycling and rate performances of cobalt-substituted Li 2 MnSiO 4 /C compounds, Li 2 Mn 1−x Co x SiO 4 /C (x = 0.25, 0.5, and 0.75), were evaluated and compared with those of Li 2 MnSiO 4 /C and Li 2 CoSiO 4 /C. Li 2 Mn 1−x Co x SiO 4 /C (x = 0.25, 0.5, and 0.75) compositions comprising uniform nanosized primary particles and no impurities were successfully synthesized using a hydrothermal method, followed by carbon coating. In addition, Li 2 MnSiO 4 /C and Li 2 CoSiO 4 /C were synthesized for comparison. The synthesized Li 2 Mn 1−x Co x SiO 4 /C (x = 0.25, 0.5, and 0.75) were solid solutions and were identified using an orthorhombic unit cell with Pmn2 1 space group symmetry. Although the capacity fades for Li 2 Mn 1−x Co x SiO 4 /C were similar to those for Li 2 MnSiO 4 /C, the discharge capacity, average discharge voltage and rate capability of Li 2 MnSiO 4 / C improved when Co was substituted for Mn. Li 2 Mn 0.25 Co 0.75 SiO 4 /C exhibited the best electrochemical performance with first energy density of 659.7 Wh kg −1 which was greater than that of LiMn 2 O 4 (500 Wh kg −1) and LiNi 1/3 Co 1/3-Mn 1/3 O 2 (600 Wh kg −1). The good electrochemical performance of Li 2 Mn 0.25 Co 0.75 SiO 4 /C is attributed to its lower charge transfer resistance relative to that of Li 2 MnSiO 4 /C.

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Mesoporous silica-assisted carbon free Li₂MnSiO₄cathode nanoparticles for high capacity Li rechargeable batteries

Cited by 15 publications

References 31 publications

Nanostructured Li₂MnSiO₄/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries

Nanostructured Li₂MnSiO₄/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries

Advanced High Energy Density Secondary Batteries with Multi‐Electron Reaction Materials

Enhanced Energy Density of Li<sub>2</sub>MnSiO<sub>4</sub>/C Cathode Materials for Lithium-ion Batteries through Mn/Co Substitution

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Mesoporous silica-assisted carbon free Li2MnSiO4cathode nanoparticles for high capacity Li rechargeable batteries

Cited by 15 publications

References 31 publications

Nanostructured Li2MnSiO4/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries

Nanostructured Li2MnSiO4/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries

Advanced High Energy Density Secondary Batteries with Multi‐Electron Reaction Materials

Enhanced Energy Density of Li<sub>2</sub>MnSiO<sub>4</sub>/C Cathode Materials for Lithium-ion Batteries through Mn/Co Substitution

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Mesoporous silica-assisted carbon free Li₂MnSiO₄cathode nanoparticles for high capacity Li rechargeable batteries

Nanostructured Li₂MnSiO₄/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries

Nanostructured Li₂MnSiO₄/C Cathodes with Hierarchical Macro‐/Mesoporosity for Lithium‐Ion Batteries