• Title/Summary/Keyword: Anode Material

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Mechanochemical Synthesis of ZnMn2O4 and its Electrochemical Properties as an Anode Material for Lithium-ion Batteries

  • Park, Yoon-Soo;Oh, Hoon;Lee, Sung-Man
    • Bulletin of the Korean Chemical Society
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    • v.32 no.9
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    • pp.3333-3337
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    • 2011
  • $ZnMn_2O_4$ has been prepared by a mechanochemical process using a mixture of $Mn_2O_3$ and ZnO as starting materials, and investigated as a possible anode material for lithium-ion batteries. The phase evolution and morphologies of the ball-milled and annealed powders are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive microanalysis (EDX), respectively. The solid-state reaction for the formation of $ZnMn_2O_4$, under the given experimental conditions, is achieved in a short time (30 min), and the prepared samples exhibit excellent electrochemical performances including an enhanced initial coulombic efficiency, high reversible capacity, and stable capacity retention with cycling.

Preparation of Anode Material for Lithium Secondary Battery using Pitch-coated Graphite Residue Compounds

  • Ko, Young-Shin;Oh, Won-Chun
    • Carbon letters
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    • v.8 no.3
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    • pp.207-213
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    • 2007
  • The properties and electrochemical characteristics of anode material using pitch-coated graphite residue compounds by heat-treatment at $600^{\circ}C$ for 1 hour were investigated. The distance of layers of pitch-coated graphite residual compounds was 3.3539 ${\AA}$, which was as same as that of graphite. Its electrochemical and charge discharge characteristics were tested according to different four types of carbon material, natural graphite, pitch-coated graphite, amorphous graphite and pitch-coated graphite residual compounds, respectively. So it was shown the best charge-discharge characteristics in all of the samples. For the electrochemical and charge-discharge characteristics, although pitch-coated graphite residual compounds had different carbon contents 70% and 80%, these two samples were shown good electrochemical and charge-discharge characteristics.

Electrochemical Properties of Surface-Modified Silicon as Anode for Lithium Secondary Batteries (실리콘 재료의 표면개질에 따른 리튬이차전지 음극 특성)

  • Park, Cheol-Wan;Doh, Chil-Hoon;Moon, Seong-In;Yun, Mun-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2003.11a
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    • pp.602-606
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    • 2003
  • Silicon has been developed as an alternate anode material for lithium secondary batteries. A simple approach to improve the electrical contact of silicon powder has described. Carbon-coated and silver-coated silicon have been prepared by chemical vapor deposition and electroless plating respectively. Assembled cells, which consisted of surface modified silicon, lithium foil and $Li^+$ contained organic electrolyte, have been studied using electrochemical methods. Carbon-coated silicon was improved in the electrochemical performance such as reversibility and resistance compared to surface-unmodified silicon.

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Recent Advances in Cathode and Anode Materials for Lithium Ion Batteries (리튬 이온 배터리용 양극 및 음극 재료의 최근 동향)

  • Nguyen, Van Hiep;Kim, Young Ho
    • Applied Chemistry for Engineering
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    • v.29 no.6
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    • pp.635-644
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    • 2018
  • Lithium ion batteries have been broadly used in various applications to our daily life such as portable electronics, electric vehicles and grid-scale energy storage devices. Significant efforts have recently been made on developing electrode materials for lithium ion batteries that meet commercial needs of the high energy density, light weight and low cost. In this review, we summarize the principles and recent research advances in cathode and anode materials for lithium ion batteries, and particularly emphasize electrode material designs and advanced characterization techniques.

A New Way to Prepare MoO3/C as Anode of Lithium ion Battery for Enhancing the Electrochemical Performance at Room Temperature

  • Yu, Zhian;Jiang, Hongying;Gu, Dawei;Li, Jishu;Wang, Lei;Shen, Linjiang
    • Journal of Electrochemical Science and Technology
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    • v.7 no.2
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    • pp.170-178
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    • 2016
  • Composited molybdenum oxide and amorphous carbon (MoO3/C) as anode material for lithium ion batteries has been successfully synthesized by calcining polyaniline (PANI) doped with ammonium heptamolybdate tetrahydrate (AMo). The as prepared electrode material was characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (FE-SEM). The electrochemical performance of the anode was investigated by galvanostatic charge/discharge, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The MoO3/C shows higher specific capacity, better cyclic performance and rate performance than pristine MoO3 at room temperature. The electrochemical of MoO3/C properties at various temperatures were also investigated. At elevated temperature, MoO3/C exhibited higher specific capacity but suffered rapidly declines. While at low temperature, the electrochemical performance was mainly limited by the low kinetics of lithium ion diffusion and the high charge transfer resistance.

Electrochemical Characteristics of Porous Modified Silicon Impregnated with Metal as Anode Materials for Lithium Secondary Batteries (리튬 이차전지용 금속이 담지된 다공성 실리콘 음극물질의 전기화학적 특성)

  • Jang, Eun-Jung;Jeon, Bup-Ju
    • Transactions of the Korean hydrogen and new energy society
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    • v.23 no.4
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    • pp.353-363
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    • 2012
  • The relationship between the diffusivity and electrochemical characteristics of lithium secondary battery with the modified Si anode material prepared in HF/$AgNO_3$ solution was investigated. The crystallographic structure and images of the modified porous Si and modified Si/Cu was examined using the X-ray diffraction, BET and SEM. To examine the effect of metal composite and pore size distribution according to chemical etching on the electrochemical characterization, the electrodes for half cells were prepared with the modified Si, modified Si/Cu, and modified Si/Cu annealed with $600^{\circ}C$. Our results showed that the chemical diffusivity of lithium ions was related to structure and resistance of Si/Cu composite anode material. The lithium diffusivity in modified silicon compound calculated from the CV was at the range of $1{\times}10^{-12}$ to $9{\times}10^{-16}cm^2/s$. The effects of modified silicon structure and resistance on the cycling efficiency were significant.

Transmission Electron Microscope Specimen Preparation of Si-Based Anode Materials for Li-Ion Battery by Using Focused Ion Beam and Ultramicrotome

  • Chae, Jeong Eun;Yang, Jun Mo;Kim, Sung Soo;Park, Ju Cheol
    • Applied Microscopy
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    • v.48 no.2
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    • pp.49-53
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    • 2018
  • A successful transmission electron microscope (TEM) analysis is closely related to the preparation of the TEM specimen and should be followed by the suitable TEM specimen preparation depending on the purpose of analysis and the subject materials. In the case of the Si-based anode material, lithium atoms of formed Li silicide were removed due to ion beam and electron beam during TEM specimen preparation and TEM observation. To overcome the problem, we proposed a new technique to make a TEM specimen without the ion beam damage. In this study, two types of test specimens from the Si-based anode material of Li-ion battery were prepared by respectively adopting the only focused ion beam (FIB) method and the new FIB-ultramicrotome method. TEM analyses of two samples were conducted to compare the Ga ion damage of the test specimen.

2D Coordination Polymer Derived Co3O4 Nanocrystals as High Performance Anode Material of Lithium-Ion Batteries

  • Wen, Hao;Shi, Changdong;Gao, Yuanrui;Rong, Hongren;Sha, Yanyong;Liu, Hongjiang;Liu, Qi
    • Nano
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    • v.13 no.12
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    • pp.1850139.1-1850139.10
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    • 2018
  • $Co_3O_4$ nanocrystals have been synthesized via an ordinary one-step calcination of a cobalt-based 2D coordination polymer [Co(tfbdc)(4,4'-bpy)$(H_2O)_2$]. As an anode material for lithium-ion batteries, the obtained $Co_3O_4$ nanocrystals exhibit high reversible capacity, excellent cyclic stability and better rate capability. The reversible capacity of the $Co_3O_4$ nanocrystals maintains $713mA\;h\;g^{-1}$ after 50 cycles at a current density of $50mA\;g^{-1}$. Our results confirm that searching for metal oxides nanomaterials used as anode materials of lithium ion batteries via the calcinations of 2D coordination polymer is a new route.

Preparation and Characteristics of Core-Shell Structure with Nano Si/Graphite Nanosheets Hybrid Layers Coated on Spherical Natural Graphite as Anode Material for Lithium-ion Batteries

  • Kwon, Hae-Jun;Son, Jong-In;Lee, Sung-Man
    • Journal of Electrochemical Science and Technology
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    • v.12 no.1
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    • pp.74-81
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    • 2021
  • Silicon (Si) is recognized as a promising anode material for high-energy-density lithium-ion batteries. However, under a condition of electrode comparable to commercial graphite anodes with low binder content and a high electrode density, the practical use of Si is limited due to the huge volume change associated with Si-Li alloying/de-alloying. Here, we report a novel core-shell composite, having a reversible capacity of ~ 500 mAh g-1, by forming a shell composed of a mixture of nano-Si, graphite nanosheets and a pitch carbon on a spherical natural graphite particle. The electrochemical measurements are performed using electrodes with 2 wt % styrene butadiene rubber (SBR) and 2 wt.% carboxymethyl cellulose (CMC) binder in an electrode density of ~ 1.6 g cm-3. The core-shell composites having the reversible capacity of 478 mAh g-1 shows the outstanding capacity retention of 99% after 100 cycles with the initial coulombic efficiency of 90%. The heterostructure of core-shell composites appears to be very effective in buffering the volume change of Si during cycling.

The Research on Aluminum and Silcon Nanoparticles as Anode Materials for Lithium Ion Batteries (알루미늄 실리콘 나노분말을 이용한 리튬이온전지 음극재료에 관한 연구)

  • Kim, Hyeong-Jo;Tulugan, Kelimu;Kim, Hyung-Jin;Park, Won-Jo
    • Journal of Power System Engineering
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    • v.17 no.1
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    • pp.110-115
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    • 2013
  • The electrochemical performance and microstructure of Al-Si, Al-Si/C was investigated as anode for lithium ion battery. The Al-Si nano composite with 5 : 1 at% ratio was prepared by arc-discharge nano powder process. However, some of problem is occurred, when Al nano composite was synthesized by this manufacturing. The oxidation film is generated around Al-Si particles for passivating processing in the manufacture. The oxidation film interrupts electrical chemistry reaction during lithium ion insertion/extraction for charge and discharge. Because of the existence the oxidation film, Al-Si first cycle capacity is very lower than other examples. Therefore, carbon synthsized by glucose ($C_6H_{12}O_6$) was conducted to remove the oxidation film covered on the composite. The results showed that the first discharge cycle capacity of Al-Si/C is improved to 113mAh/g comparing with Al-Si (18.6mAh/g). Furthermore, XRD data and TEM images indicate that $Al_4C_3$ crystalline exist in Al-Si/C composite. In addition the Si-Al anode material, in which silicon is more contained was tested by same method as above, it was investigated to check the anode capacity and morphology properties in accordance with changing content of silicon, Si-Al anode has much higher initial discharge capacity(about 500mAh/g) than anode materials based on Aluminum as well as the morphology properties is also very different with the anode based Aluminum.