Study on Carbon-Coated LiMn0.7Fe0.3-xNixPO4 (0 ≤ x ≤ 0.15) as Cathode Material for Lithium Ion Batteries

2015 ◽  
Vol 827 ◽  
pp. 140-145 ◽  
Author(s):  
Joko Triwibowo ◽  
Jan Setiawan ◽  
Raden Ibrahim Purawiardi ◽  
Bambang Prihandoko
Keyword(s):  
Cathode Material ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Inert Atmosphere ◽  
Software Analysis ◽  
State Process ◽  
Refinement Method ◽  
Metallic Lithium ◽  
Carbon Coated ◽  
Charge Discharge

Phosphate-based cathode material, LMP, with olivine crystal structure is generally known as cathode material with low electronic conductivity. Therefore, these materials should be coated by conductive materials. In this study the synthesis of carbon-coated cathode material and dopant variations in cathode material to improve the working potential of the battery are observed. The process of synthesis is carried out through the conventional solid-state process. The starting materials, Li2CO3, MnO2, Fe, Ni and NH4H2PO4 in the powder form are mixed homogenously. The homogeneous mixture is further mixed with a solution of in water dissolved citric acid. This is then dried in oven for 24 hours. The dry mixture is then heated at a temperature of 320°C for 10 hours in a furnace with an inert atmosphere. The obtained powder is subsequently heated at 800°C for 8 hours in the furnace with flowing nitrogen gas. Phase of the powder obtained after the second heating was analyzed by XRD. Phase compositions were analyzed by Rietveld refinement method through a GSAS-software. Analysis of the microstructure and morphology are performed by SEM and BET. Cathode material performance is analyzed by using the Charge-Discharge battery analyzer. To perform Charge-Discharge analysis, cathode material is assembled into a half cell with metallic lithium as the counter electrode and 1 M LiPF6 dissolved in EC: DEC (1: 1 v / v) as the electrolyte.

Synthesis and Characterization of Carbon-Coated LiFePO4 with Various Carbon Sources as Cathode Material for Lithium Ion Batteries through a Solid-State Process

2015 ◽  
Vol 827 ◽  
pp. 186-191
Author(s):  
Joko Triwibowo ◽  
Irvan Alamsyah ◽  
Jan Setiawan
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Electrochemical Impedance ◽  
Carbon Sources ◽  
Lithium Ion ◽  
Liquid Form ◽  
Nitrogen Gas ◽  
State Process ◽  
Bet Analysis ◽  
Carbon Coated

Synthesis of carbon-coated LiFePO4 as cathode material is performed through a solid-state process. Materials in the form of a powder comprising LiOH.H2O and Fe2O3 and H3PO4 in liquid form are mixed evenly to obtain a homogeneous powder. Through the drying process in an oven with a temperature of 80°C for 24 hours a dry powder is obtained. Powder is subsequently ground and calcined in the horizontal tube furnace at a temperature of 320°C for 10 hours under the flowing nitrogen gas. The obtained powder is further ground and mixed with carbon sources as much as 4wt% of the total powder. Citric acid, tartaric acid and fructose are used as the carbon source. These homogeneously mixed powders are subsequently sintered at a temperature of 800°C for 8 hours under the flowing nitrogen gas. Phase obtained from the solid-state process was analyzed by XRD. Phase composition is analyzed by Rietveld refinement that is included in the GSAS-program. The conductivity of obtained powder as cathode materials is tested by EIS (Electrochemical Impedance Spectroscopy). SEM and BET analysis tests are conducted to determine the morphology of powder which can influence the conductivity of the material.

THE EFFECTS OF CARBON NANO-COATING ON Li(Ni0.8Co0.15Al0.05)O2 CATHODE MATERIAL USING ORGANIC CARBON FOR Li-ION BATTERY

2010 ◽  
Vol 17 (01) ◽  
pp. 51-58 ◽  
Author(s):  
JEONG-HUN JU ◽  
YOUNG-MIN CHUNG ◽  
YU-RIM BAK ◽  
MOON-JIN HWANG ◽  
KWANG-SUN RYU
Keyword(s):  
Cathode Material ◽  
Coating Layer ◽  
Sol Gel ◽  
Electronic Conductivity ◽  
Lithium Ion ◽  
Cyclic Voltammogram ◽  
Active Materials ◽  
Nano Coating ◽  
Primary Particles ◽  
Li Ion

Carbon nano-coated LiNi 0.8 Co 0.15 Al 0.05 O 2/ C (LNCAO/C) cathode-active materials were prepared by a sol–gel method and investigated as the cathode material for lithium ion batteries. Electrochemical properties including the galvanostatic charge–discharge ability and cyclic voltammogram behavior were measured. Cyclic voltammetry (2.7–4.8 V) showed that the carbon nano-coating improved the "formation" of the LNCAO electrode, which was related to the increased electronic conductivity between the primary particles. The carbon nano-coated LNCAO/C exhibited good electrochemical performance at high C -rate. Also, the thermal stability at a highly oxidized state of the carbon nano-coated LNCAO was remarkably enhanced. The carbon nano-coating layer can serve as a physical and/or (electro-)chemical protection shell for the underlying LNCAO, which is attributed to an increase of the grain connectivity (physical part) and also to the protection of metal oxide from chemical reactions (chemical part).

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.

Investigation on Structure and Electrochemical Properties of Li[Ni1/3Co1/3Mn1/3]O2 for Lithium Ion Batteries

2007 ◽  
Vol 336-338 ◽  
pp. 455-458
Author(s):  
Xiu Juan Shi ◽  
Yong Ping Zheng ◽  
Fei Yu Kang ◽  
Xin Lu Li ◽  
Wan Ci Shen
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Sol Gel ◽  
Lithium Ion ◽  
Hexagonal Structure ◽  
Oxidation States ◽  
Potential Range ◽  
Xps Analysis ◽  
Electrochemical Behaviors ◽  
Charge Discharge

Cathode material Li[Ni1/3Co1/3Mn1/3]O2 for lithium-ion batteries with layered hexagonal structure was successfully synthesized in sol-gel way. The influences of calcination temperature (from 700° to 1000°C) on the structure and electrochemical behaviors of Li[Ni1/3Co1/3Mn1/3]O2 were extensively investigated. The results of XRD show that all samples are isostructural with α-NaFeO2 with a space group R-3m. XPS analysis shows that the oxidation states of Co and Mn were Co3+ and Mn4+ respectively, while Ni exists as Ni2+ and Ni3+. The charge-discharge experiments show that the sample calcined at 850°C delivers 194.8mAh/g in the first cycle at C/5 rate in 2.5-4.3V potential range.

Optimized carbon-coated LiFePO4 cathode material for lithium-ion batteries

2009 ◽  
Vol 115 (1) ◽  
pp. 245-250 ◽  
Author(s):  
Y.Z. Dong ◽  
Y.M. Zhao ◽  
Y.H. Chen ◽  
Z.F. He ◽  
Q. Kuang
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Carbon Coated ◽  
Lifepo4 Cathode

Preparation and Characterization of High-Voltage Cathode Material LiNi0.5Mn1.5O4 for Lithium Ion Batteries

2019 ◽  
Vol 953 ◽  
pp. 121-126
Author(s):  
Zhe Chen ◽  
Quan Fang Chen ◽  
Sha Ne Zhang ◽  
Guo Dong Xu ◽  
Mao You Lin ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Synthesis Method ◽  
Rate Capability ◽  
Lithium Ion ◽  
Diffusion Path ◽  
High Energy ◽  
High Energy Density ◽  
Charge Discharge

High energy density and rechargeable lithium ion batteries are attracting widely interest in renewable energy fields. The preparation of the high performance materials for electrodes has been regarded as the most challenging and innovative aspect. By utilizing a facile combustion synthesis method, pure nanostructure LiNi0.5Mn1.5O4 cathode material for lithium ion batteries were successfully fabricated. The crystal phase of the samples were characterized by X-Ray Diffraction, and micro-morphology as well as electrochemistry properties were also evaluated using FE-SEM, electrochemical charge-discharge test. The result shows the fabricated LiNi0.5Mn1.5O4 cathode materials had outstanding crystallinity and near-spherical morphologies. That obtained LiNi0.5Mn1.5O4 samples delivered an initial discharge capacity of 137.2 mAhg-1 at the 0.1 C together with excellent cycling stability and rate capability as positive electrodes in a lithium cell. The superior electrochemical performance of the as-prepared samples are owing to nanostructure particles possessing the shorter diffusion path for Li+ transport, and the nanostructure lead to large contact area to effectively improve the charge/discharge properties and the rate property. It is demonstrated that the as-prepared nanostructure LiNi0.5Mn1.5O4 samples have potential as cathode materials of lithium-ion battery for future new energy vehicles.

scholarly journals Boosting Ultra-Fast Charge Battery Performance: Filling Porous nanoLi4Ti5O12 Particles with 3D Network of N-doped Carbons

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Jean-Christophe Daigle ◽  
Yuichiro Asakawa ◽  
Mélanie Beaupré ◽  
Vincent Gariépy ◽  
René Vieillette ◽  
...  
Keyword(s):  
Electronic Conductivity ◽  
Lithium Ion ◽  
Surface Reactivity ◽  
Fast Charge ◽  
3D Network ◽  
Fast Charging ◽  
Carbon Coated ◽  
Unique Approach ◽  
First Time ◽  
Lithium Titanium

AbstractLithium titanium oxide (Li4Ti5O12)-based cells are a promising technology for ultra-fast charge-discharge and long life-cycle batteries. However, the surface reactivity of Li4Ti5O12 and lack of electronic conductivity still remains problematic. One of the approaches toward mitigating these problems is the use of carbon-coated particles. In this study, we report the development of an economical, eco-friendly, and scalable method of making a homogenous 3D network coating of N-doped carbons. Our method makes it possible, for the first time, to fill the pores of secondary particles with carbons; we reveal that it is possible to cover each primary nanoparticle. This unique approach permits the creation of lithium-ion batteries with outstanding performances during ultra-fast charging (4C and 10C), and demonstrates an excellent ability to inhibit the degradation of cells over time at 1C and 45 °C. Furthermore, using this method, we can eliminate the addition of conductive carbons during electrode preparation, and significantly increase the energy density (by weight) of the anode.

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