Mesoporous graphitic carbon microspheres with a controlled amount of amorphous carbon as an efficient Se host material for Li–Se batteries

2018 ◽  
Vol 6 (9) ◽  
pp. 4152-4160 ◽  
Author(s):  
Young Jun Hong ◽  
Kwang Chul Roh ◽  
Yun Chan Kang
Keyword(s):  
Activated Carbon ◽  
Cathode Material ◽  
Electrochemical Properties ◽  
Amorphous Carbon ◽  
Graphitic Carbon ◽  
Host Material ◽  
Carbon Microspheres ◽  
Host Materials

Graphitic carbon–TiO microspheres with optimum structures are synthesized as host materials for amorphous elemental Se by the modification of activated carbon microspheres. Graphitic carbon–TiO/Se microspheres exhibit excellent electrochemical properties as a cathode material for Li–Se batteries.

scholarly journals Surface Modification Effect and Electrochemical Performance of LiOH-High Surface Activated Carbon as a Cathode Material in EDLC

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2187
Author(s):  
Zambaga Otgonbayar ◽  
Sunhye Yang ◽  
Ick-Jun Kim ◽  
Won-Chun Oh
Keyword(s):  
Activated Carbon ◽  
Cathode Material ◽  
Electrochemical Properties ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Oxidizing Agent ◽  
Peak Current ◽  
X Ray ◽  
Current Value

This study aimed to improve the performance of the activated carbon-based cathode by increasing the Li content and to analyze the effect of the combination of carbon and oxidizing agent. The crystal structure and chemical structure phase of Li-high surface area activated carbon material (Li-HSAC) was analyzed by X-ray diffraction (XRD) and Raman spectroscopy, the surface state and quantitative element by scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDX) and the surface properties with pore-size distribution by Brunauer–Emmett–Teller (BET), Barrett–Joyner–Halenda (BJH) and t-plot methods. The specific surface area of the Li-YP80F is 1063.2 m2/g, micropore volume value is 0.511 cm3/g and mesopore volume is 0.143 cm3/g, and these all values are higher than other LiOH-treated carbon. The surface functional group was analyzed by a Boehm titration, and the higher number of acidic groups compared to the target facilitated the improved electrolyte permeability, reduced the interface resistance and increased the electrochemical properties of the cathode. The oxidizing agent of LiOH treated high surface area of activated carbon was used for the cathode material for EDLC (electric double layer capacitor) to determine its electrochemical properties and the as-prepared electrode retained excellent performance after 10 cycles and 100 cycles. The anodic and cathodic peak current value and peak segregation of Li-YP80F were better than those of the other two samples, due to the micropore-size and physical properties of the sample. The oxidation peak current value appeared at 0.0055 mA/cm2 current density and the reduction peak value at –0.0014 mA/cm2, when the Li-YP80F sample used to the Cu-foil surface. The redox peaks appeared at 0.0025 mA/cm2 and –0.0009 mA/cm2, in the case of using a Nickel foil, after 10 cycling test. The electrochemical stability of cathode materials was tested by 100 recycling tests. After 100 recycling tests, peak current drop decreased the peak profile became stable. The LiOH-treated high surface area of activated carbon had synergistically upgraded electrochemical activity and superior cycling stability that were demonstrated in EDLC.

Yolk–shell carbon microspheres with controlled yolk and void volumes and shell thickness and their application as a cathode material for Li–S batteries

2017 ◽  
Vol 5 (3) ◽  
pp. 988-995 ◽  
Author(s):  
Young Jun Hong ◽  
Jung-Kul Lee ◽  
Yun Chan Kang
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
Shell Thickness ◽  
Carbon Materials ◽  
Carbon Microspheres ◽  
Step Process ◽  
New Strategy ◽  
Void Volumes

A new strategy for the formation of yolk–shell structured carbon materials by a simple two-step process is introduced. The sulfur infiltrated carbon yolk–shell microspheres with a filled yolk showed good electrochemical properties as a cathode material for Li–S batteries.

scholarly journals One-pot coating of LiCoPO4/C by a UiO-66 metal–organic framework

RSC Advances ◽  
2020 ◽  
Vol 10 (58) ◽  
pp. 35206-35213
Author(s):  
Abdelaziz M. Aboraia ◽  
Viktor V. Shapovalov ◽  
Alexnader A. Guda ◽  
Vera V. Butova ◽  
Alexander Soldatov
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
High Voltage ◽  
Metal Organic Framework ◽  
One Pot ◽  
Metal Organic ◽  
Organic Framework

LiCoPO4 (LCP) is a promising high voltage cathode material but suffers from low conductivity and poor electrochemical properties.

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