Well-Designed Spherical Morphology Li1.2Mn0.54Ni0.13Co0.13O2 as Superior Cathode Materials for Lithium-Ion Batteries

2016 ◽  
Vol 852 ◽  
pp. 853-857
Author(s):  
Shao Meng Ma ◽  
Xian Hua Hou ◽  
Yan Ling Huang ◽  
Xiao Li Zou ◽  
She Jun Hu
Keyword(s):  
Cathode Material ◽  
Cathode Materials ◽  
Performance Test ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Constant Current ◽  
Precipitation Method ◽  
One Pot ◽  
Constant Current Density ◽  
High Discharge Capacity

Li-rich layered cathode materials with an average composition of Li1.2Mn0.54Ni0.13Co0.13O2 have been successfully synthesized via one-pot facile co-precipitation method. The spherical cathode material and the unconsolidated shape one are obtained by optimizing the experimental condition. The results of electrochemical performance test expose that the spherical cathode material exhibits more excellent cycle ability and rate performance than the unconsolidated one. The initial charge-discharge specific capacities of the spherical cathode are approximately 323.4 mAh g-1 and 266.4 mAh g-1, respectively, showing an initial coulombic efficiency of 82.4%. A high discharge capacity of 241.1 mAh g-1 is maintained with the capacity retention of 90.5% after 50 cycles at a constant current density of 50 mA g-1 (1 C=250 mAh g-1).

scholarly journals Synthesis of Li4Ti5O12/V2O5 Nanocomposites for Lithium-ion Batteries by a One-pot co-precipitation Method

2021 ◽  
Author(s):  
liu zhenjie ◽  
Yudai Huang ◽  
xingchao Wang ◽  
Yue Zhang ◽  
juan Ding ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
One Pot ◽  
High Discharge ◽  
X Ray ◽  
High Discharge Capacity ◽  
Transmission Electron ◽  
Co Precipitation ◽  
Nano Size

Abstract Li4Ti5O12/V2O5 nanocomposites were synthesized by a one-pot co-precipitation method. The structure and morphology of the as-prepared materials were analyzed by X-ray diffraction and transmission electron microscopy. The results show that Li4Ti5O12/V2O5 composites with different nano size were successfully synthesized. The Li4Ti5O12/V2O5 sample (2 wt.% V2O5 addition of Li4Ti5O12) keep at a high discharge capacity of 169.9 mAh g− 1 after 150 cycles at 1 C. The existence of the V2O5 reduces the size of Li4Ti5O12, which improve the electrochemical activity of the sample.

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.

An Effective Method to Reduce Residual Lithium on LiNi0.8Co0.1Mn0.1O2 Cathode Material Using a Reducing Agent

2021 ◽  
Vol 21 (3) ◽  
pp. 2019-2023
Author(s):  
Ji-Woong Shin ◽  
Seon-Jin Lee ◽  
Sang-Yong Oh ◽  
Yun-Chae Nam ◽  
Jong-Tae Son
Keyword(s):  
Cathode Material ◽  
Cathode Materials ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Lithium Ion ◽  
Side Reaction ◽  
Reducing Agent ◽  
Cycle Performance ◽  
Temperature Cycle ◽  
Material Surface

Among the various cathode materials used in LIBs (Lithium ion batteries), nickel rich cathode materials have attracted an increasing amount of interest due to their high capacity, relatively low cost, and low toxicity when compared to LiCoO2. However, these materials always contain a large amount of residual lithium compounds such as LiOH and Li2CO3. The presence of lithium residues is undesirable because the oxidation of these compounds results in the formation of Li2O and CO2 gas at higher voltages, which lowers the coulombic efficiency between the charge and discharge capacities during cycling. In this study, using LiNi0.8Co0.1Mn0.1O2 as a starting material, a surface-modified cathode material was obtained by using reducing agent. The reducing agent not only plays the role of reducing the oxide conversion energy but also suppresses the side reaction with the electrolyte due to the surface modification. Residual lithium present on the cathode material surface was reduced from 11,702 ppm to 8,658 ppm, resulting in improved high temperature cycle performance and impedance characteristics.

scholarly journals Effect of Metal (Mn, Ti) Doping on NCA Cathode Materials for Lithium Ion Batteries

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Dao Yong Wan ◽  
Zhi Yu Fan ◽  
Yong Xiang Dong ◽  
Erdenebayar Baasanjav ◽  
Hang-Bae Jun ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Cathode Materials ◽  
Hydrothermal Reaction ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Superior Performance ◽  
Distribution Analysis ◽  
Layer Spacing ◽  
High Discharge Capacity ◽  
Ti Doping

NCA (LiNi0.85Co0.10Al0.05-x MxO2, M=Mn or Ti, x < 0.01) cathode materials are prepared by a hydrothermal reaction at 170°C and doped with Mn and Ti to improve their electrochemical properties. The crystalline phases and morphologies of various NCA cathode materials are characterized by XRD, FE-SEM, and particle size distribution analysis. The CV, EIS, and galvanostatic charge/discharge test are employed to determine the electrochemical properties of the cathode materials. Mn and Ti doping resulted in cell volume expansion. This larger volume also improved the electrochemical properties of the cathode materials because Mn4+ and Ti4+ were introduced into the octahedral lattice space occupied by the Li-ions to expand the Li layer spacing and, thereby, improved the lithium diffusion kinetics. As a result, the NCA-Ti electrode exhibited superior performance with a high discharge capacity of 179.6 mAh g−1 after the first cycle, almost 23 mAh g−1 higher than that obtained with the undoped NCA electrode, and 166.7 mAh g−1 after 30 cycles. A good coulombic efficiency of 88.6% for the NCA-Ti electrode is observed based on calculations in the first charge and discharge capacities. In addition, the NCA-Ti cathode material exhibited the best cycling stability of 93% up to 30 cycles.

One-Pot Synthesis of Carbon-Coated ZnFe2O4 with Excellent Electrochemical Performance as an Anode in Lithium Ion Battery

2013 ◽  
Vol 724-725 ◽  
pp. 1037-1041 ◽  
Author(s):  
Ling Min Yao ◽  
Xian Hua Hou ◽  
She Jun Hu ◽  
Xiao Qin Tang ◽  
Xiang Liu
Keyword(s):  
Electrochemical Performance ◽  
Hydrothermal Reaction ◽  
Specific Capacity ◽  
High Capacity ◽  
Lithium Ion ◽  
Constant Current ◽  
One Pot ◽  
Constant Current Density ◽  
Excellent Electrochemical Performance ◽  
Carbon Coated

Carbon-coated ZnFe2O4lithium anode with nanosize has been successfully synthesized by a one-pot green-chemical hydrothermal reaction with glucose as carbon source. An analysis of electrochemical performance showed that the prepared carbon-coated ZnFe2O4anode exhibited high capacity retention. The initial charge-discharge specific capacity was approximately 1388 mAhg-1and 1008 mAhg-1, respectively. And a reversible specific capacity could be maintained about 700 mAhg-1after 100 cycles at a constant current density of 100 mAg-1, indicating good cycle ability compared with majority reported literatures. The excellent electrochemical performance was related to the carbon coating and nanoparticles, with which the electric conductivity of the material increased and the volume expansion and pulverization of the particles became increasingly reduced.

Preparation of Precursor of Lini0.5mn1.5o4 with High Density

2012 ◽  
Vol 463-464 ◽  
pp. 881-884 ◽  
Author(s):  
Chao Lin Miao ◽  
Lu Shi ◽  
Gai Rong Chen ◽  
Dong Mei Dai
Keyword(s):  
Cathode Material ◽  
Lithium Ion Battery ◽  
Cathode Materials ◽  
Filter Cake ◽  
Lithium Ion ◽  
High Density ◽  
Cycle Performance ◽  
Precipitation Method ◽  
Tap Density ◽  
The Relationship

The precursor of LiNi0.5MnSubscript text1.5O4cathode material with high density was synthesized by two-dryness co-precipitation method. The optimized parameters were found out by studying the relationship between the density of precursor and the concentration of reactants, the manner of adding agglomerating agent, the remaining water in filter cake and the manner of dryness. The highest density (1.74 g/cm3) of precursor can be achieved under optimized condition: NiSO40.375 mol/L, coagulation agent added with little amount but many times, 28% of water in filter cake and two-step dryness, which is much better than that made by other methods. Our experiment provides a significant reference for the synthesis of excellent-performance cathode materials of lithium-ion battery. LiNi0.5MnSubscript text1.5O4has a good cycle performance, a higher discharge capacity and a discharge platform of 4.7v, so it has become a research focus of 5-voltage cathode materials in the field of lithium ion battery recently.[1-4] However, LiNi0.5Mn1.5O4 prepared by common methods usually has a lower tap volume capacity.[5-9] HiroyuKi Ito[6] reported a continuous fabricated high-density cobalt-manganese-doped nickel hydroxide method with which the density of product was between 1.5-1.91g/cm3, however the used ammonia as a complexation agent in the preparation process not only increased the cost of the preparation, but also led to environmental pollution. Research results show that the cathode material synthesized using high-density precursor has a higher tap density, a larger volume capacity and a good electrochemical performance.[10] In this paper, we find out the optimized parameters of preparation of precursor of LiNi0.5MnSubscript text1.5O4by studying the relationship between the density of precursor and concentration of reactants, the manner of adding agglomerating agent, the remaining water in filter cake and the manner of dryness.

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.

LaPO4-coated Li1.2Mn0.56Ni0.16Co0.08O2 as a cathode material with enhanced coulombic efficiency and rate capability for lithium ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77324-77331 ◽  
Author(s):  
Qingliang Xie ◽  
Chenhao Zhao ◽  
Zhibiao Hu ◽  
Qi Huang ◽  
Cheng Chen ◽  
...  
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Lithium Ion ◽  
Combustion Method ◽  
Chemical Precipitation ◽  
Porous Microspheres

Layered Li[Li0.2Mn0.56Ni0.16Co0.08]O2 porous microspheres have been successfully synthesized by a urea combustion method, and then coated with appropriate amount of LaPO4via a facile chemical precipitation route.

Enhanced high rate performance of Li[Li0.17Ni0.2Co0.05Mn0.58−xAlx]O2−0.5x cathode material for lithium-ion batteries

RSC Advances ◽  
2015 ◽  
Vol 5 (61) ◽  
pp. 49651-49656 ◽  
Author(s):  
Y. L. Wang ◽  
X. Huang ◽  
F. Li ◽  
J. S. Cao ◽  
S. H. Ye
Keyword(s):  
Cathode Material ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Sol Gel ◽  
Lithium Ion ◽  
High Rate ◽  
Rate Performance ◽  
High Rate Performance

Pristine LNCM and LNCMA as Li-rich cathode materials for lithium ion batteries were synthesized via a sol–gel route. The Al-substituted LNCM sample exhibits an enhanced high rate performance and superior cyclability.

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