scholarly journals In Situ Carbon Coated LiNi0.5Mn1.5O4 Cathode Material Prepared by Prepolymer of Melamine Formaldehyde Resin Assisted Method

2016 ◽  
Vol 2016 ◽  
pp. 1-5 ◽  
Author(s):  
Wei Yang ◽  
Haifeng Dang ◽  
Shengzhou Chen ◽  
Hanbo Zou ◽  
Zili Liu ◽  
...  
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
Lithium Ion ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Capacity Retention ◽  
Melamine Formaldehyde Resin ◽  
Carbon Coated ◽  
Specific Discharge ◽  
Face Centered

Carbon coated spinel LiNi0.5Mn1.5O4 were prepared by spray-drying using prepolymer of melamine formaldehyde resin (PMF) as carbon source of carbon coating layer. The PMF carbon coated LiNi0.5Mn1.5O4 was characterized by XRD, SEM, and other electrochemical measurements. The as-prepared lithium nickel manganese oxide has the cubic face-centered spinel structure with a space group of Fd3m. It showed good electrochemical performance as a cathode material for lithium ion battery. After 100 discharge and charge cycles at 0.5 C rate, the specific discharge capacity of carbon coated LiNi0.5Mn1.5O4 was 130 mAh·g−1, and the corresponding capacity retention was 98.8%. The 100th cycle specific discharge capacity at 10 C rate of carbon coated LiNi0.5Mn1.5O4 was 105.4 mAh·g−1, and even the corresponding capacity retention was 95.2%.

A microporous carbon derived from phenol–melamine–formaldehyde resin by K2CO3 activation for lithium ion batteries

Ionics ◽  
2012 ◽  
Vol 19 (3) ◽  
pp. 409-414 ◽  
Author(s):  
Yinhai Zhu ◽  
Xiaoxia Xiang ◽  
Enhui Liu ◽  
Yuhu Wu ◽  
Hui Xie ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Microporous Carbon ◽  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin

scholarly journals In-Situ Arc Discharge-Derived FeSn2/Onion-Like Carbon Nanocapsules as Improved Stannide-Based Electrocatalytic Anode Materials for Lithium-Ion Batteries

Catalysts ◽  
2019 ◽  
Vol 9 (11) ◽  
pp. 950 ◽  
Author(s):  
Dandan Han ◽  
Amrita Chatterjee ◽  
Long Hin Man ◽  
Siu Wing Or
Keyword(s):  
Crystal Growth ◽  
Discharge Capacity ◽  
Arc Discharge ◽  
Lithium Ion ◽  
Core Shell ◽  
Discharge Process ◽  
Capacity Retention ◽  
Specific Discharge ◽  
Charge Discharge

Core/shell-structured FeSn2/onion-like carbon (FeSn2/OLC) nanocapsules of confined size range of sub-50 nm are synthesized via an in-situ arc-discharge process, and are evaluated in comparison with FeSn2 nanoparticles as an improved stannide-based electrocatalytic anode material for Li-ion batteries (LIBs). The in-situ arc-discharge process allows a facile one-pot procedure for forming crystalline FeSn2 stannide alloy nanoparticle cores coated by defective OLC thin shells in addition to a confined crystal growth of the FeSn2 nanoparticle cores. The LIB cells assembled using the FeSn2/OLC nanocapsules as the electrocatalytic anodes exhibit superior full specific discharge capacity of 519 mAh·g−1 and specific discharge capacity retention of ~62.1% after 100 charge-discharge cycles at 50 mA·g−1 specific current. The electrochemical stability of FeSn2/OLC nanocapsules is demonstrated from the good cycle stability of the LIBs with a high specific discharge capacity retention of 67.5% on a drastic change in specific current from 4000 to 50 mA·g−1. A formation mechanism is proposed to describe the confined crystal growth of the FeSn2 nanoparticle cores and the formation of the FeSn2/OLC core/shell structure. The observed electrochemical performance enhancement is ascribed to the synergetic effects of the enabling of a reversible lithiation process during charge-discharge of the LIB cells by the FeSn2 nanoparticle cores as well as the protection of the FeSn2 nanoparticle cores from volume change-induced pulverization and solid electrolyte interphase-induced passivation by the OLC shells.

Synthesis and Characterization of Gradient Cathode Material for Lithium-Ion Batteries

2011 ◽  
Vol 391-392 ◽  
pp. 1435-1439
Author(s):  
Tao Dong ◽  
Li Peng Zhang ◽  
Xian Jin Yu ◽  
Zeng Dian Zhao ◽  
Yun Hui Dong
Keyword(s):  
Cathode Material ◽  
Discharge Capacity ◽  
Electrochemical Impedance ◽  
Lithium Ion ◽  
Gradient Material ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Electronic Microscope ◽  
Discharge Test

Gradient cathode material of LiNi0.7Co0.15Mn0.15O2 was synthesized by mixing hydroxide co-precipitated precursors with 8% excess LiOH•H2O. Structure and electrochemical properties of the material was characterized by X-ray diffraction (XRD), scanning electronic microscope (SEM), galvanostatic charge-discharge test and electrochemical impedance spectroscopy (EIS). The results indicate that the typical crystal of the material is α-NaFeO2. The particles are formed by 200nm~500nm crystals. The gradient material sintered at 800°C shows the best electrochemical performance, the initial discharge capacity of the material is 164.45mAh•g-1 at 0.2C, its discharge capacity retention of 86% at 2C and with lower electrochemical impedance.

Syntheses of magnetic GO @ melamine formaldehyde resin for dyes adsorption

2019 ◽  
Vol 6 (8) ◽  
pp. 086103 ◽  
Author(s):  
Jianxin Chen ◽  
Minghuang Jiang ◽  
Jian Han ◽  
Kaili Liu ◽  
Mengling Liu ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin ◽  
Dyes Adsorption

scholarly journals A novel fabrication of monodisperse melamine–formaldehyde resin microspheres to adsorb lead (II)

2016 ◽  
Vol 288 ◽  
pp. 745-757 ◽  
Author(s):  
Guangtian Ming ◽  
Hongdong Duan ◽  
Xia Meng ◽  
Guangming Sun ◽  
Wenjun Sun ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin ◽  
Resin Microspheres

HIGH POWER PERFORMANCE OF MULTICOMPONENT OLIVINE CATHODE MATERIAL FOR LITHIUM-ION BATTERIES

2011 ◽  
Vol 04 (03) ◽  
pp. 299-303 ◽  
Author(s):  
ZHUO TAN ◽  
PING GAO ◽  
FUQUAN CHENG ◽  
HONGJUN LUO ◽  
JITAO CHEN ◽  
...  
Keyword(s):  
Transition Metal ◽  
Cathode Material ◽  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Coprecipitation Method ◽  
Homogeneous Distribution ◽  
Power Performance ◽  
X Ray ◽  
Carbon Coated

A multicomponent olivine cathode material, LiMn0.4Fe0.6PO4 , was synthesized via a novel coprecipitation method of the mixed transition metal oxalate. X-ray diffraction patterns indicate that carbon-coated LiMn0.4Fe0.6PO4 has been prepared successfully and that LiMn0.4Fe0.6PO4/C is crystallized in an orthorhombic structure without noticeable impurity. Homogeneous distribution of Mn and Fe in LiMn0.4Fe0.6PO4/C can be observed from the scanning electron microscopy (SEM) and the corresponding energy dispersive X-ray spectrometry (EDS) analysis. Hence, the electrochemical activity of each transition metal in the olivine synthesized via coprecipitation method was enhanced remarkably, as indicated by the galvanostatic charge/discharge measurement. The synthesized LiMn0.4Fe0.6PO4/C exhibits a high capacity of 158.6 ± 3 mAhg-1 at 0.1 C, delivering an excellent rate capability of 122.6 ± 3 mAhg-1 at 10 C and 114.9 ± 3 mAhg-1 at 20 C.

Preparation and characterization of melamine-formaldehyde resin microcapsules containing fragrant oil

2006 ◽  
Vol 11 (4) ◽  
pp. 332-336 ◽  
Author(s):  
Jun-Seok Hwang ◽  
Jin-Nam Kim ◽  
Young-Jung Wee ◽  
Jong-Sun Yun ◽  
Hong-Gi Jang ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Melamine Formaldehyde ◽  
Melamine Formaldehyde Resin
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