Study on the Synthesis of LiCoO2 from Spent Li-Ion Batteries

2012 ◽  
Vol 630 ◽  
pp. 93-98 ◽  
Author(s):  
Yan Gao ◽  
Jin Hui Li
Keyword(s):  
Reaction Time ◽  
Cycling Performance ◽  
Molar Ratio ◽  
Li Ion Batteries ◽  
Iron Precipitation ◽  
Structure And Morphology ◽  
Leaching Solution ◽  
Li Ion ◽  
Precipitation Ph ◽  
Charge Discharge

A new LiCoO2 recovery technology from leaching solution of spent Li-ion batteries was studied in this paper. Leaching solution contained many metals, such as Cu, Co and Fe. Copper was removed through replacement by iron powder followed by iron precipitation in goethite method. The experimental results show that Cu can be removed 99% at least through replacement by Fe powder, and the removal of Fe can achieve 99% by goethite method. The optimum Cu removal conditions are that temperature is 50 °C, Femol/Cumol=1.5,reaction time is 30 min. The optimum Fe removal conditions are that terminal precipitation pH is 4, temperature is 90 °C, reaction time is 6 h. The remainder Co can be mixed with Li2CO3,LiOH•H2O and LiAc•2H2O to adjust the Li/Co molar ratio to 1.00. The new LiCoO2 was obtained by calcining the mixture at 850°C for 12 h in the air. Structure and morphology of the recycled powders and resulted sample were observed by XRD and SEM technique, respectively. The layered structure of the LiCoO2 synthesized by adding Li2CO3 is best, and it is found to have the best characteristics as cathode material in terms of charge–discharge capacity and cycling performance.

Metal film deposition on carbon anodes for high rate charge–discharge of Li–ion batteries

1999 ◽  
Vol 15 (3) ◽  
pp. 225-229 ◽  
Author(s):  
T. Takamura ◽  
J. Suzuki ◽  
C. Yamada ◽  
K. Sumiya ◽  
K. Sekine
Keyword(s):  
Metal Film ◽  
Film Deposition ◽  
High Rate ◽  
Li Ion Batteries ◽  
Li Ion ◽  
Carbon Anodes ◽  
Charge Discharge

scholarly journals Lithium-Rich Cobalt-Free Manganese-Based Layered Cathode Materials for Li-Ion Batteries: Suppressing the Voltage Fading

Energies ◽  
2020 ◽  
Vol 13 (13) ◽  
pp. 3487
Author(s):  
Ashraf Abdel-Ghany ◽  
Ahmed M. Hashem ◽  
Alain Mauger ◽  
Christian M. Julien
Keyword(s):  
Layered Structure ◽  
Performance Enhancement ◽  
Electrochemical Impedance ◽  
Discharge Process ◽  
High Porosity ◽  
Li Ion Batteries ◽  
Hydrothermal Route ◽  
Li Ion ◽  
Fading Rate ◽  
Charge Discharge

Lithium-rich layered oxides are recognized as promising materials for Li-ion batteries, owing to higher capacity than the currently available commercialized cathode, for their lower cost. However, their voltage decay and cycling instability during the charge/discharge process are problems that need to be solved before their practical application can be envisioned. These problems are mainly associated with a phase transition of the surface layer from the layered structure to the spinel structure. In this paper, we report the AlF3-coating of the Li-rich Co-free layered Li1.2Ni0.2Mn0.6O2 (LLNMO) oxide as an effective strategy to solve these problems. The samples were synthesized via the hydrothermal route that insures a very good crystallization in the layered structure, probed by XRD, energy-dispersive X-ray (EDX) spectroscopy, and Raman spectroscopy. The hydrothermally synthesized samples before and after AlF3 coating are well crystallized in the layered structure with particle sizes of about 180 nm (crystallites of ~65 nm), with high porosity (pore size 5 nm) determined by Brunauer–Emmett–Teller (BET) specific surface area method. Subsequent improvements in discharge capacity are obtained with a ~5-nm thick coating layer. AlF3-coated Li1.2Ni0.2Mn0.6O2 delivers a capacity of 248 mAh g−1 stable over the 100 cycles, and it exhibits a voltage fading rate of 1.40 mV per cycle. According to the analysis from galvanostatic charge-discharge and electrochemical impedance spectroscopy, the electrochemical performance enhancement is discussed and compared with literature data. Post-mortem analysis confirms that the AlF3 coating is a very efficient surface modification to improve the stability of the layered phase of the Li-rich material, at the origin of the significant improvement of the electrochemical properties.

Effect of Electrolyte Additives on Cycling Performance of 18650 Graphite//NMC811 Li-ion Batteries

2020 ◽  
Vol 97 (7) ◽  
pp. 155-166
Author(s):  
Suchakree Tubtimkuna ◽  
Montree Sawangphruk ◽  
Farkfun Duriyasart
Keyword(s):  
Cycling Performance ◽  
Li Ion Batteries ◽  
Electrolyte Additives ◽  
Li Ion

scholarly journals Enhanced cycling performance of nanostructure LiFePO4/C composites with in situ 3D conductive networks for high power Li-ion batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (73) ◽  
pp. 41850-41857 ◽  
Author(s):  
Chunsong Zhao ◽  
Lu-Ning Wang ◽  
Jitao Chen ◽  
Min Gao
Keyword(s):  
High Power ◽  
Cycling Performance ◽  
High Rate ◽  
Li Ion Batteries ◽  
Li Ion

Excellent cycling performance for a high rate LiFePO4/C composite with in situ 3D conductive networks.

scholarly journals Enhanced Cycling Performance of Ni-Rich Positive Electrodes (NMC) in Li-Ion Batteries by Reducing Electrolyte Free-Solvent Activity

2019 ◽  
Vol 11 (38) ◽  
pp. 34973-34988 ◽  
Author(s):  
Ryoichi Tatara ◽  
Yang Yu ◽  
Pinar Karayaylali ◽  
Averey K. Chan ◽  
Yirui Zhang ◽  
...  
Keyword(s):  
Cycling Performance ◽  
Li Ion Batteries ◽  
Positive Electrodes ◽  
Li Ion ◽  
Solvent Activity
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