Effects of Feed Rate and pH Value on the Physical and Electrochemical Properties of LiNi0.4Co0.2Mn0.4O2 Cathode Material for Lithiumion Battery

2014 ◽  
Vol 989-994 ◽  
pp. 462-466
Author(s):  
Fang Du ◽  
Liang Fu Peng
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
Cathode Materials ◽  
Feed Rate ◽  
Ph Value ◽  
Structural Features ◽  
Precipitation Method ◽  
Precipitation Reaction ◽  
Voltage Range ◽  
Co Precipitation

The layered LiNi0.4Co0.2Mn0.4O2was synthesized by co-precipitation method using carbonate sodium as precipitant. The microscopic structural features and morphologies of as-prepared cathode materials were investigated using X-ray diffraction (XRD) and scanning electron microscopy (SEM). And then, the charge-discharge measurements were carried out to determine the electrochemical properties in a voltage range of 2.5-4.6 V. The results show that the pH value in the process of co-precipitation reaction plays a greater part on the electrochemical properties than feed rate does. The cathode materials prepared at higher pH value illustrate better electrochemical properties in the voltage range of 2.5-4.6 V, which can be attributed to a less cation mixing in the cathode material as well as the smaller primary particles and the smaller second particles.

Synthesis and Characterization of LiNixCoyMn1-x-yO2 as a Cathode Material for Lithium Ion Batteries

2007 ◽  
Vol 280-283 ◽  
pp. 677-682 ◽  
Author(s):  
Pei Yun Liao ◽  
Jenq Gong Duh
Keyword(s):  
Cathode Material ◽  
Cathode Materials ◽  
Ph Value ◽  
Lithium Ion ◽  
Sulfate Solution ◽  
Hexagonal Structure ◽  
Precipitation Method ◽  
Future Application ◽  
Metal Sulfate ◽  
Voltage Range

The newly developed LiNi0.6Co0.4-xMnxO2 (0.1 < x < 0.3) cathode materials were synthesized by calcining the mixture of NixCoyMn1-x-y(OH)2 and Li2CO3 at 900-940 oC for 15 hr in flowing O2 atmosphere. The NixCoyMn1-x-y(OH)2 precursor was obtained by the chemical co-precipitation method at the pH value controlled by the concentration of NaOH, NH4OH and transition metal sulfate solution. The X-ray diffraction patterns indicated the pure layered hexagonal structure LiNi0.6Co0.4-xMnxO2. The electrochemical behavior of LiNixCoyMn1-x-yO2 powder was examined by using test cells cycled within the voltage range 3-4.3 V at the 0.1C rate for the first cycle and then at the 0.2C rate afterwards. LiNixCoyMn1-x-yO2 cathode materials showed good initial discharge capacity (165-180 mAh/g) and cycling performance. The fading rate was less than 5 % after 20 cycling test. It is demonstrated that LiNixCoyMn1-x-yO2 electrode should exhibit great potential for the future application in lithium-ion battery cathode material.

Synthesis and Electrochemical Properties of 0.5Li2MnO3•0.5LiMn0.5Ni0.5O2

2010 ◽  
Vol 105-106 ◽  
pp. 664-667
Author(s):  
Sheng Wen Zhong ◽  
Wei Hu ◽  
Qian Zhang
Keyword(s):  
Cathode Material ◽  
Electrochemical Properties ◽  
Specific Capacity ◽  
Precipitation Method ◽  
Electrochemical Performances ◽  
Discharge Specific Capacity ◽  
Xrd Patterns ◽  
Co Precipitation ◽  
Two Stages ◽  
Calcined Temperature

The precursor of Mn0.75Ni0.25CO3 is prepared by carbonate co-precipitation method. And the cathode material 0.5Li2MnO3•0.5LiMn0.5Ni0.5O2 is synthesized with two stages calcining temperatures T1 and T2. T1 represents 400°C, 500°C, 600°C and T2 is selected at 750°C, 850°C, 950°C respectively. XRD Patterns shows that the cathode material has the integrated structures of Li2MnO3 and LiMO2, and it has better crystallization during the rise of calcined temperature at 950°C. The electrochemical performances tests indicates that the initial discharge specific capacity are greater than 220mAh/g at the current density 0.2 mA/cm2 in 2.5-4.6V at room temperature. When cathode material is calcined at 750°C, its discharge specific capacity even reach to 248mAh/g, but the cathode material has more perfect general electrochemical properties during calcined temperature at 950°C.

Facile synthesis of nanostructured MoO3 coated Li1.2Mn0.56Ni0.16Co0.08O2 materials with good electrochemical properties

RSC Advances ◽  
2016 ◽  
Vol 6 (114) ◽  
pp. 113275-113282 ◽  
Author(s):  
Yuxian Gao ◽  
Pinghong Xu ◽  
Fang Chen ◽  
Chuxiong Ding ◽  
Long Chen ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Molten Salt ◽  
Cathode Materials ◽  
Precipitation Method ◽  
Molten Salt Method ◽  
Facile Synthesis ◽  
Co Precipitation

Li1.2Mn0.56Ni0.16Co0.08O2 cathode materials were synthesized by a co-precipitation method, and consequently coated with MoO3 by a molten salt method.

Structure and Electrochemical Properties of Spherical 0.3Li2MnO3•0.7Li(Ni1/3Co1/3Mn1/3)O2 Cathode Materials

2012 ◽  
Vol 472-475 ◽  
pp. 1800-1803 ◽  
Author(s):  
Guang Xin Fan ◽  
Shu Pu Dai ◽  
Hui Lian Li ◽  
Chuan Xiang Zhang ◽  
Yong Jun Xu ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Discharge Capacity ◽  
Cathode Materials ◽  
Electrochemical Method ◽  
Cycling Performance ◽  
Precipitation Method ◽  
Co Precipitation

Spherical 0.3LiMn2O3•0.7Li(Ni1/3Co1/3Mn1/3)O2 cathode was synthesized by co-precipitation method followed by calcining at various temperatures (700-950 oC). The structures of the samples were investigated by XRD, SEM, BET and electrochemical method. The results showed that the cathode prepared at 700 oC had the highest discharge capacity of 220.8 mAhg-1 and a satisfactory cycling performance in this study. After 25 cycles, its discharge capacity was still retained as high as 199.6 mAhg-1, which is benefited from the special sphercial microsturcture.

The Effect of Si Doping or/and Ti Coating on the Electrochemical Properties of Ni-Rich NCA (LiNi0.8Co0.15Al0.05O2) Cathode Material for Lithium-Ion Batteries

2020 ◽  
Vol 12 (10) ◽  
pp. 1581-1585
Author(s):  
Tae-Hyun Ha ◽  
Jun-Seok Park ◽  
Gyu-Bong Cho ◽  
Hyo-Jun Ahn ◽  
Ki-Won Kim ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Cathode Material ◽  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
High Capacity ◽  
Lithium Ion ◽  
Physical Contact ◽  
Precipitation Method ◽  
Si Doping

LiNixCoyAlzO2 (NCA) is one of the most promising candidates of cathode material for lithium ion batteries because of its high capacity, energy density, and low cost. However, Ni-rich NCA cathode materials suffer from side reaction (formation of lithium carbonate and hydrogen fluoride attack) between electrolyte and surface of electrode and irreversible phase transition leading to capacity fading and thermal instability. These problems could be improved by coating and doping of transition metal elements. Si doping contributes to stabilization of the unstable R-3m structure, and Ti coating is capable of prohibiting the direct physical contact of electrode with electrolyte. In this work, LiNi0.8Co0.15Al0.05O2 (NCA) cathode materials coated or/and doped by Ti and Si elements were fabricated by co-precipitation method using the ball-milling. The crystal structure, morphology and electrochemical properties are investigated using X-ray diffraction (XRD), scanning electron microscopy (FE-SEM), transmission electron microscopy (FE-TEM), and WBCS3000 (WonA tech Co., Ltd.). The EIS and charge/discharge results of Si doped and Ti coated NCA exhibited the lowest resistance value (147.19 Ω) and capacity retentions of 88% after 100 cycles at 0.5 C.

scholarly journals Construction of E-pH diagram and experimental study on wet synthesis of FePO4 as the precursor of cathode materials

2022 ◽  
Vol 355 ◽  
pp. 01013
Author(s):  
Ping Xue ◽  
Qingwei Qin ◽  
Guangqiang Li
Keyword(s):  
Experimental Study ◽  
Cathode Materials ◽  
Theoretical Basis ◽  
High Performance ◽  
Ph Value ◽  
Thermodynamic Theory ◽  
Impurity Phase ◽  
Precipitation Method ◽  
Wet Synthesis ◽  
Co Precipitation

The preparation of FePO4 as a precursor by co-precipitation method is widely used, Due to the lack of the guidance of thermodynamic theory, The prepared FePO4 often contains impurity phase, which leads to unsatisfactory performance of LiFeO4. The E-pH diagram of Fe-P-H2O system at the temperature of 25℃ were drawn through the basic E-pH principle with a number of thermodynamic data. According to the E-pH Diagram, the pH value is approximately 2.5, and the FePO4 with less impurity can be prepared by adding proper oxidant. Base on the above mentioned condition, a simple verification experiment was carried out. The results showed that the prepared iron FePO4 had fewer impurities, which provided a theoretical basis for preparing high-performance LiFeO4.

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