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.

scholarly journals Enhanced Electrochemical Performance of Li1.27Cr0.2Mn0.53O2 Layered Cathode Materials via a Nanomilling-Assisted Solid-state Process

Materials ◽  
2019 ◽  
Vol 12 (3) ◽  
pp. 468 ◽  
Author(s):  
Chengkang Chang ◽  
Jian Dong ◽  
Li Guan ◽  
Dongyun Zhang
Keyword(s):  
Solid State ◽  
Cathode Material ◽  
Photoelectron Spectroscopy ◽  
Lithium Ion ◽  
Electrochemical Process ◽  
Ion Diffusion ◽  
X Ray ◽  
State Process ◽  
Redox Pair ◽  
Electron Process

Li1.27Cr0.2Mn0.53O2 layered cathodic materials were prepared by a nanomilling-assisted solid-state process. Whole-pattern refinement of X-ray diffraction (XRD) data revealed that the samples are solid solutions with layered α-NaFeO2 structure. SEM observation of the prepared powder displayed a mesoporous nature composed of tiny primary particles in nanoscale. X-ray photoelectron spectroscopy (XPS) studies on the cycled electrodes confirmed that triple-electron-process of the Cr3+/Cr6+ redox pair, not the two-electron-process of Mn redox pair, dominants the electrochemical process within the cathode material. Capacity test for the sample revealed an initial discharge capacity of 195.2 mAh·g−1 at 0.1 C, with capacity retention of 95.1% after 100 cycles. EIS investigation suggested that the high Li ion diffusion coefficient (3.89 × 10−10·cm2·s−1), caused by the mesoporous nature of the cathode powder, could be regarded as the important factor for the excellent performance of the Li1.27Cr0.2Mn0.53O2 layered material. The results demonstrated that the cathode material prepared by our approach is a good candidate for lithium-ion batteries.

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.

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.

scholarly journals PEO Infiltration of Porous Garnet-Type Lithium-Conducting Solid Electrolyte Thin Films

Ceramics ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 421-436
Author(s):  
Aamir Iqbal Waidha ◽  
Vanita Vanita ◽  
Oliver Clemens
Keyword(s):  
Thin Films ◽  
Solid State ◽  
Ionic Conductivity ◽  
Electrochemical Impedance ◽  
Three Dimensional ◽  
Lithium Ion ◽  
Interfacial Resistance ◽  
Composite Electrolytes ◽  
Ion Conducting ◽  
Polymer Infiltration

Composite electrolytes containing lithium ion conducting polymer matrix and ceramic filler are promising solid-state electrolytes for all solid-state lithium ion batteries due to their wide electrochemical stability window, high lithium ion conductivity and low electrode/electrolyte interfacial resistance. In this study, we report on the polymer infiltration of porous thin films of aluminum-doped cubic garnet fabricated via a combination of nebulized spray pyrolysis and spin coating with subsequent post annealing at 1173 K. This method offers a simple and easy route for the fabrication of a three-dimensional porous garnet network with a thickness in the range of 50 to 100 µm, which could be used as the ceramic backbone providing a continuous pathway for lithium ion transport in composite electrolytes. The porous microstructure of the fabricated thin films is confirmed via scanning electron microscopy. Ionic conductivity of the pristine films is determined via electrochemical impedance spectroscopy. We show that annealing times have a significant impact on the ionic conductivity of the films. The subsequent polymer infiltration of the porous garnet films shows a maximum ionic conductivity of 5.3 × 10−7 S cm−1 at 298 K, which is six orders of magnitude higher than the pristine porous garnet film.

Electrochemical Properties of Carbon-Coated NbO2 as a Negative Electrode for Lithium-Ion Batteries

2016 ◽  
Vol 724 ◽  
pp. 87-91 ◽  
Author(s):  
Chang Su Kim ◽  
Yong Hoon Cho ◽  
Kyoung Soo Park ◽  
Soon Ki Jeong ◽  
Yang Soo Kim
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Ball Milling ◽  
Carbon Coating ◽  
Electrochemical Impedance ◽  
Active Material ◽  
Negative Electrode ◽  
Lithium Ion ◽  
Transfer Resistance ◽  
Carbon Coated

We investigated the electrochemical properties of carbon-coated niobium dioxide (NbO2) as a negative electrode material for lithium-ion batteries. Carbon-coated NbO2 powders were synthesized by ball-milling using carbon nanotubes as the carbon source. The carbon-coated NbO2 samples were of smaller particle size compared to the pristine NbO2 samples. The carbon layers were coated non-uniformly on the NbO2 surface. The X-ray diffraction patterns confirmed that the inter-layer distances increased after carbon coating by ball-milling. This lead to decreased charge-transfer resistance, confirmed by electrochemical impedance spectroscopy, allowing electrons and lithium-ions to quickly transfer between the active material and electrolyte. Electrochemical performance, including capacity and initial coulombic efficiency, was therefore improved by carbon coating by ball-milling.

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
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