Effect of particle size distribution on the electrochemical performance of micro-sized silicon-based negative materials

Wu, Shuaijin; Yu, Bing; Wu, Zhaohui; Fang, Sheng; Shi, Bimeng; Yang, Jian

doi:10.1039/c8ra00539g

Cited by 47 publications

(26 citation statements)

References 23 publications

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“…From SEM image, we can confirm that the sample sintered at 660 °C shows smooth surface without evident cracks and mitigated structural degradation owing to buffer space, NCM91 and electrode structure integrity. The minor crack can be explained by rolling process 30 . However, the sample sintered at 740 °C has significant crack on the surface under the same condition.…”

Section: Resultsmentioning

confidence: 99%

Optimized electrochemical performance of Ni rich LiNi0.91Co0.06Mn0.03O2 cathodes for high-energy lithium ion batteries

Lee

Jin

et al. 2019

Sci Rep

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We report high electrochemical performances of LiNi 0.91 Co 0.06 Mn 0.03 O 2 cathode material for high-energy lithium ion batteries. LiNi 0.91 Co 0.06 Mn 0.03 O 2 is synthesized at various sintering temperatures (640~740 °C). The sintering temperatures affect crystallinity and structural stability, which play an important role in electrochemical performances of LiNi 0.91 Co 0.06 Mn 0.03 O 2 . The electrochemical performances are improved with increasing sintering temperature up to an optimal sintering temperature. The LiNi 0.91 Co 0.06 Mn 0.03 O 2 sintered at 660 °C shows remarkably excellent performances such as initial discharge capacity of 211.5 mAh/g at 0.1 C, cyclability of 85.3% after 70 cycles at 0.5 C and rate capability of 90.6% at 2 C as compared to 0.5 C. These results validate that LiNi 0.91 Co 0.06 Mn 0.03 O 2 sintered at 660 °C can be regarded as a next generation cathode.

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Section: Resultsmentioning

confidence: 99%

Optimized electrochemical performance of Ni rich LiNi0.91Co0.06Mn0.03O2 cathodes for high-energy lithium ion batteries

Lee

Jin

et al. 2019

Sci Rep

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“…Mater. 2020, 32,2001924 organic fatty acid ligands (OA, PA, and linoleic acid ligands) in nonpolar media. However, it is difficult for these hydrophobic NPs to stably and uniformly adsorb onto hydrophilic substrates with the desired size and shape.…”

Section: Mcf A)mentioning

confidence: 99%

“…Mater. 2020, 32,2001924 from conventional LbL assemblies based on complementary interactions (i.e., electrostatic attraction, hydrogen bonding, or covalent bonding) between organic ligands and bulky polymer linkers without any ligand exchange reaction.…”

Section: Mcf A)mentioning

confidence: 99%

Nanoparticle‐Based Electrodes with High Charge Transfer Efficiency through Ligand Exchange Layer‐by‐Layer Assembly

Kwon

Lee

et al. 2020

Advanced Materials

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Electrochemical energy storage devices can be categorized as Faradaic or non-Faradaic charge storage mechanisms depending on the presence of redox charge transfer reactions. [9] Various carbon materials (e.g., porous activated carbon, graphene, and carbon nanotubes (CNTs)) exhibit good charge transfer behavior (i.e., high power) due to their high electrical conductivity. In this case, the charged species (i.e., electric energy) are physically aligned and accumulate along the surface of carbon materials upon potential sweeps, forming an electrical double layer. [10] This charge storage mechanism, which is electrochemical double layer capacitance, has fast charge transfer kinetics and depends on the area of the electrode/electrolyte interface. However, these carbon materials with electrochemical double layer capacitance have intrinsically low-energy density (i.e., a low areal capacitance of ≈30 µF cm −2), [11] limiting their use in high power applications, such as uninterruptible power supplies and load leveling. [12] It has been reported that the immobilization of oxygen functional groups on the surface of carbon materials can induce a Faradaic reaction with specific cations (e.g., Li + or H +) and thus increase the energy density. [13,14] However, carbonbased electrodes have inherently low density (<1 g cm −3) and thus exhibit low volumetric energy density, limiting their practical use in high energy applications, including portable electronic devices and electric vehicles. Recently, various transition metal oxides (TMOs), such as iron oxide, manganese oxide, cobalt oxide, and their mixed oxides, have been investigated for high energy density electrode materials for both pseudocapacitors and batteries due to their high theoretical capacity and large surface-to-volume ratio (i.e., large active surface area in nanomaterial-based electrodes). [15-23] That is, in contrast to capacitive carbon materials, TMO-based electrodes can store large amounts of energy through additional redox reactions (≈2.5 electrons per metal atom of the accessible active surface of transition metal oxides [24]) on/near the electrode surface (pseudocapacitance) or within the bulk of the materials by ion intercalation or phase conversion reactions in battery systems. [25] In addition, the electrochemical performance of TMO-based electrodes can be further improved by controlling their structural parameters, such as particle size, uniformity, crystallinity, crystallite (domain) size, and orientation. [26-33] Organic-ligand-based solution processes of metal and transition metal oxide (TMO) nanoparticles (NPs) have been widely studied for the preparation of electrode materials with desired electrical and electrochemical properties for various energy devices. However, the ligands adsorbed on NPs have a significant effect on the intrinsic properties of materials, thus influencing the performance of bulk electrodes assembled by NPs for energy devices. To resolve these critical drawbacks, numerous approaches have focused on developing unique surface c...

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“…The synthesis process of the integrated strategy is vividly shown in Figure (a). The nano‐sized LMR particles are distributed and further stacked between the micron‐sized LMR secondary particles, improving the space utilization of particle distribution and narrowing the pore size and reducing the porosity of the electrode . When the ratio of LMR and n‐LMR is 10 : 1, the obtained hybrid LMR material demonstrates the highest tap density of 1.68 g cm −3 and is denoted as H‐LMR, which is attributed to improving the volumetric energy density.…”

Section: Resultsmentioning

confidence: 95%

Enhanced Electrochemical Performance of Li‐ and Mn‐Rich Cathode Materials by Particle Blending and Surface Coating

et al. 2020

ChemistrySelect

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A Li‐ and Mn‐rich material Li1.18Mn0.55Ni0.18Co0.09O2 (LMR) exhibits a high specific capacity; however, this material has serious problems, including a poor rate capability and limited cycling life. A jet crushing method is used to break micron‐sized LMR particles synthesized by a solid‐state reaction into nano‐sized particles. Compared to micron‐sized particles, nano‐sized LMR particles possess a higher rate capability due to shorter Li+ diffusion pathway, but also an increase in side reactions with the electrolyte leads to poorer cycling performance. Herein, we propose a material engineering strategy that combines micron‐ and nano‐sized particle blending and a cerium oxide (CeO2) surface coating modifications to enhance the electrochemical performance of LMR material. X‐ray diffraction (XRD) patterns and transmission electron microscopy (TEM) images demonstrate that the cubic structure of CeO2 is uniformly distributed on the surface of LMR, which is supposed to suppress the electrode/electrolyte side reactions by preventing electrode particles from being directly exposed to the electrolyte. As a result, the discharge capacity of the modified LMR material is 153.1 mAh g−1 at 5 C compared to 139.1 mAh g−1 with the pristine material. The capacity retention of the modified material is 82.8 % after 200 cycles at 1 C, which is higher than the 77.1 % capacity retention of the pristine material. X‐ray photoelectron spectroscopy (XPS) reveals that the CeO2 coating layer has a significant role in mitigating oxygen release from the surface of the LMR material during cycling.

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Effect of particle size distribution on the electrochemical performance of micro-sized silicon-based negative materials

Abstract: Si has been extensively examined as a potential alternative to carbonaceous negative materials, because it shows exceptional gravimetric capacity and abundance.

Cited by 47 publications

References 23 publications

Optimized electrochemical performance of Ni rich LiNi0.91Co0.06Mn0.03O2 cathodes for high-energy lithium ion batteries

Optimized electrochemical performance of Ni rich LiNi0.91Co0.06Mn0.03O2 cathodes for high-energy lithium ion batteries

Nanoparticle‐Based Electrodes with High Charge Transfer Efficiency through Ligand Exchange Layer‐by‐Layer Assembly

Enhanced Electrochemical Performance of Li‐ and Mn‐Rich Cathode Materials by Particle Blending and Surface Coating

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