Homogeneous precipitation synthesis and electrochemical performance of LiFePO4/CNTs/C composites as advanced cathode materials for lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (130) ◽  
pp. 107293-107298 ◽  
Author(s):  
Peipei Zhu ◽  
Zhenyu Yang ◽  
Peng Zeng ◽  
Jing Zhong ◽  
Ji Yu ◽  
...  
Keyword(s):  
Particle Size ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Annealing Process ◽  
Homogeneous Precipitation ◽  
Transfer Resistance ◽  
Ion Migration ◽  
Precipitation Synthesis ◽  
Electron Transfer Resistance

LiFePO4/CNTs/C composite cathode materials were synthesized by a simple homogeneous precipitation and subsequent annealing process. The resulting composite material exhibits smaller particle size, lower electron-transfer resistance, and faster lithium ion migration.

Probing the Effect of High Energy Ball Milling on the Structure and Properties of LiNi1/3Mn1/3Co1/3O2 Cathodes for Li-Ion Batteries

2016 ◽  
Vol 13 (3) ◽  
Author(s):  
Malcolm Stein ◽  
Chien-Fan Chen ◽  
Matthew Mullings ◽  
David Jaime ◽  
Audrey Zaleski ◽  
...  
Keyword(s):  
Particle Size ◽  
Electrochemical Performance ◽  
Crystallite Size ◽  
Ball Milling ◽  
Lithium Ion ◽  
High Energy ◽  
Li Ion Batteries ◽  
Structure And Properties ◽  
Transfer Resistance ◽  
Li Ion

Particle size plays an important role in the electrochemical performance of cathodes for lithium-ion (Li-ion) batteries. High energy planetary ball milling of LiNi1/3Mn1/3Co1/3O2 (NMC) cathode materials was investigated as a route to reduce the particle size and improve the electrochemical performance. The effect of ball milling times, milling speeds, and composition on the structure and properties of NMC cathodes was determined. X-ray diffraction analysis showed that ball milling decreased primary particle (crystallite) size by up to 29%, and the crystallite size was correlated with the milling time and milling speed. Using relatively mild milling conditions that provided an intermediate crystallite size, cathodes with higher capacities, improved rate capabilities, and improved capacity retention were obtained within 14 μm-thick electrode configurations. High milling speeds and long milling times not only resulted in smaller crystallite sizes but also lowered electrochemical performance. Beyond reduction in crystallite size, ball milling was found to increase the interfacial charge transfer resistance, lower the electrical conductivity, and produce aggregates that influenced performance. Computations support that electrolyte diffusivity within the cathode and film thickness play a significant role in the electrode performance. This study shows that cathodes with improved performance are obtained through use of mild ball milling conditions and appropriately designed electrodes that optimize the multiple transport phenomena involved in electrochemical charge storage materials.

Synthesis of LiFePO4/C Composite Cathode Materials by Solid State Method Using Mixed Iron Sources

2013 ◽  
Vol 734-737 ◽  
pp. 2541-2544
Author(s):  
Wei Wang ◽  
Zheng Zhang ◽  
Dao Wushuang Shi ◽  
Xing Quan Liu
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Molar Ratio ◽  
Electrochemical Performances ◽  
Solid State Method ◽  
State Reduction ◽  
Solid State Reduction

The olivine LiFePO4/C composite cathode materials for lithium-ion batteries were synthesized by solid state reduction method using mixed iron sources. The effects of different temperatures on the electrochemical performance of as-synthesized cathode materials were investigated and analyzed. The crystal structures and the electrochemical performances were characterized by SEM, galvanostatical charge-discharge testing and AC-impedance, respectively. The results demonstrated that the LiFePO4/C composite cathode material synthesized at 710°C and with 1/2(FeC2O4·2H2O/Fe2O3) molar ratio of mixed iron sources has the better electrochemical performance, it has a discharge capacity of 126.1mAh/g at 0.2C and the capacity is kept at 113.8mAh/g after 20 cycles.

Mesoporous composite cathode materials prepared from inverse micelle structures for high performance lithium ion batteries

RSC Advances ◽  
2014 ◽  
Vol 4 (23) ◽  
pp. 11598 ◽  
Author(s):  
Si-Jin Kim ◽  
Young-Woo Lee ◽  
Bo-Mi Hwang ◽  
Seong-Bae Kim ◽  
Woo-Seong Kim ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
High Performance ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Mesoporous Composite ◽  
Inverse Micelle

Facile Synthesis of Tremella-Like Li3V2(PO4)3/C Composite Cathode Materials Based on Oroxylum for Use in Lithium-Ion Batteries

2020 ◽  
Vol 20 (3) ◽  
pp. 1962-1967
Author(s):  
Zhen Liu ◽  
Wei Zhou ◽  
Guilin Zeng ◽  
Yuling Zhang ◽  
Zebin Wu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cathode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Composite Cathode ◽  
Potential Range ◽  
X Ray Diffraction ◽  
Immersion Method ◽  
X Ray ◽  
Transmission Electron

Oroxylum as a traditional Chinese medicine, was used as a green and novel bio-template to synthesize tremella-like Li3V2(PO4)3/C composite (LVPC) cathode materials by adopting a facile immersion method. The microstructures were analyzed by X-ray diffraction analysis, scanning electron microscopy, and transmission electron microscopy. The electrochemical properties were investigated by galvanostatic charge–discharge experiments. The LVPC revealed specific capacity of 95 mAh·g-1 at 1 C rate within potential range of 3.0–4.3 V. After 100 cycles at 0.2 C, the retention of discharge capacity was 96%. The modified electrochemical performance is mainly resulted from the distinct tremella-like structure.

Electrochemical performance of Li3−xNaxV2(PO4)3/C composite cathode materials for lithium ion batteries

2012 ◽  
Vol 201 ◽  
pp. 267-273 ◽  
Author(s):  
Quanqi Chen ◽  
Xiaochang Qiao ◽  
Yaobin Wang ◽  
Tingting Zhang ◽  
Chang Peng ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Composite Cathode
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