scholarly journals Effects of Mg Doping at Different Positions in Li-Rich Mn-Based Cathode Material on Electrochemical Performance

Nanomaterials ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 156
Author(s):  
Elena Makhonina ◽  
Lidia Pechen ◽  
Anna Medvedeva ◽  
Yury Politov ◽  
Aleksander Rumyantsev ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Solid State Reaction ◽  
Lithium Ion ◽  
Layered Oxides ◽  
Ion Diffusion ◽  
Capacity Fading ◽  
Mg Doping ◽  
Voltage Decay ◽  
Lithium Ion Diffusion

Li-rich Mn-based layered oxides are among the most promising cathode materials for next-generation lithium-ion batteries, yet they suffer from capacity fading and voltage decay during cycling. The electrochemical performance of the material can be improved by doping with Mg. However, the effect of Mg doping at different positions (lithium or transition metals) remains unclear. Li1.2Mn0.54Ni0.13Co0.13O2 (LR) was synthesized by coprecipitation followed by a solid-state reaction. The coprecipitation stage was used to introduce Mg in TM layers (sample LR-Mg), and the solid-state reaction (st) was used to dope Mg in Li layers (LR-Mg(st)). The presence of magnesium at different positions was confirmed by XRD, XPS, and electrochemical studies. The investigations have shown that the introduction of Mg in TM layers is preferable in terms of the electrochemical performance. The sample doped with Mg at the TM positions shows better cyclability and higher discharge capacity than the undoped sample. The poor electrochemical properties of the sample doped with Mg at Li positions are due to the kinetic hindrance of oxidation of the manganese-containing species formed after activation of the Li2MnO3 component of the composite oxide. The oxide LR-Mg(st) demonstrates the lowest lithium-ion diffusion coefficient and the greatest polarization resistance compared to LR and LR-Mg.

scholarly journals The impact of carbon additives on lithium ion diffusion kinetic of LiFePO4/C composites

2019 ◽  
Vol 22 (1) ◽  
pp. 173-179
Author(s):  
Thanh Dinh Duc ◽  
Anh My-Thi Nguyen ◽  
Tru Nhi Nguyen ◽  
Hang Thi La ◽  
Phung My Loan Le
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion ◽  
Second Phase ◽  
Potential Candidate ◽  
Scale Production ◽  
X Rays ◽  
Ion Diffusion ◽  
Diffusion Kinetic ◽  
The Impact ◽  
Lithium Ion Diffusion

Introduction: LiFePO4/C composites were synthesized via physical mixing assisted solvothermal process. Different kinds of carbon materials were investigated including 0D (carbon Ketjen black), 1D (carbon nanotubes) and 2D (graphene) materials. X-rays diffraction patterns of carbon coated LiFePO4 synthesized by solvothermal was indexed to pure crystalline phase without the emergence of second phase. LiFePO4 platelets and rods were in range size of 80-200 nm and dispersed well in carbon matrix. The lithium ion diffusion kinetics was evaluated through the calculated diffusion coefficients to explore the impact of carbon mixing. Methods: In this work, we studied the structure, morphologies and the lithium ion diffusion kinetic of LiFePO4/C composites for Li-ion batteries. Different characterization methods were used including powder X-rays (for crystalline structure); Transmission Electron Microscopy (for particle and morphologies observation) and Cyclic voltammetry (for electrochemical kinetic study). Results: The study indicated LiFePO4/C composites were successfully obtained by mixing process and the electrochemical performance throughout the calculated diffusion coefficient was significantly improved by adding the carbon types. Conclusion: The excellent ion diffusion was obtained for composites LiFePO4/Ketjen black (KB) and LiFePO4/CNT compared to LiFePO4/Graphene. KB could be a potential candidate for large-scale production due to low-cost, stable and high electrochemical performance.  

Lithium ion diffusion mechanism in covalent organic framework based solid state electrolyte

2019 ◽  
Vol 21 (19) ◽  
pp. 9883-9888 ◽  
Author(s):  
Kecheng Zhang ◽  
Bingkai Zhang ◽  
Mouyi Weng ◽  
Jiaxin Zheng ◽  
Shunning Li ◽  
...  
Keyword(s):  
Solid State ◽  
Diffusion Mechanism ◽  
Lithium Ion ◽  
One Dimension ◽  
Ion Diffusion ◽  
Solid State Electrolyte ◽  
Covalent Organic Framework ◽  
System P ◽  
Lithium Ion Diffusion ◽  
Organic Framework

Mechanism of Li-ions diffusion in a one-dimension tunnel of COF-5 and structure of the COF-5@LiClO4@THF system.

Cu3Si@Si core–shell nanoparticles synthesized using a solid-state reaction and their performance as anode materials for lithium ion batteries

Nanoscale ◽  
2015 ◽  
Vol 7 (37) ◽  
pp. 15075-15079 ◽  
Author(s):  
Jianbin Zhou ◽  
Ning Lin ◽  
Ying Han ◽  
Jie Zhou ◽  
Yongchun Zhu ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Solid State Reaction ◽  
Anode Materials ◽  
Lithium Ion ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

Cu3Si@Si core–shell nanoparticles are synthesized by a solid-state reaction and exhibit high electrochemical performance.

Effect of valence states of Ni and Mn on the structural and electrochemical properties of Li1.2NixMn0.8−xO2 cathode materials for lithium-ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (59) ◽  
pp. 53662-53668 ◽  
Author(s):  
Shaokun Chong ◽  
Yongning Liu ◽  
Wuwei Yan ◽  
Yuanzhen Chen
Keyword(s):  
Electrochemical Properties ◽  
Lithium Ion Batteries ◽  
Cathode Materials ◽  
Lithium Ion ◽  
Layered Oxides ◽  
Capacity Fading ◽  
Voltage Decay ◽  
Valence States

Severe capacity fading and voltage decay of Li-rich layered oxides for lithium-ion batteries remain the major bottlenecks to commercialization.

Na+ and Zr4+ co-doped Li4Ti5O12 as anode materials with superior electrochemical performance for lithium ion batteries

RSC Advances ◽  
2016 ◽  
Vol 6 (93) ◽  
pp. 90455-90461 ◽  
Author(s):  
Peng Lu ◽  
Xiaobing Huang ◽  
Yurong Ren ◽  
Jianning Ding ◽  
Haiyan Wang ◽  
...  
Keyword(s):  
Solid State ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Discharge Capacity ◽  
Solid State Reaction ◽  
Anode Materials ◽  
Rate Capability ◽  
Lithium Ion ◽  
Co Doped

Na+ and Zr4+ co-doped lithium titanates were successfully synthesized via a solid-state reaction in air. Particularly, Li3.97Na0.03Ti4.97Zr0.03O12 exhibits the best rate capability. Even at 20C, it delivers a discharge capacity of 140 mA h g−1.

Non-stoichiometric synthesis and electrochemical performance of LiFe1-xPO4/C cathode materials for lithium ion batteries

2014 ◽  
Vol 07 (02) ◽  
pp. 1450016 ◽  
Author(s):  
Chenglin Hu ◽  
Yuping Wu ◽  
Yongnian Dai
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Sol Gel ◽  
Lithium Ion ◽  
Ion Diffusion ◽  
X Ray Diffraction ◽  
X Ray ◽  
Capacity Loss ◽  
Fe Content ◽  
Lithium Ion Diffusion

Non-stoichiometric LiFe 1-x PO 4/ C composites were synthesized by a simple sol–gel method. Different impurities were detected in the X-ray diffraction measurements with the change of Fe content. The effects of Fe -poor on the structure and electrochemical performance of LiFePO 4 were investigated. Compared with stoichiometric LiFePO 4/ C , non-stoichiometric samples show better electrochemical performance because they have smaller impedance and faster lithium ion diffusion. Among these non-stoichiometric samples, LiFe 0.94 PO 4/ C cathode delivers the highest capacity of 149 mAh g-1 at 0.2 C and 103 mAh g-1 at 5 C and no capacity loss was found after 100 full cycles.

scholarly journals Spinel MgAl2O4 modification on LiCoO2 cathode materials with the combined advantages of MgO and Al2O3 modifications for high-voltage lithium-ion batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (12) ◽  
pp. 6809-6817 ◽  
Author(s):  
D. D. Liang ◽  
H. F. Xiang ◽  
X. Liang ◽  
S. Cheng ◽  
C. H. Chen
Keyword(s):  
High Temperature ◽  
Solid State ◽  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
High Voltage ◽  
Cathode Materials ◽  
Solid State Reaction ◽  
Lithium Ion ◽  
Voltage Range ◽  
Spinel Mgal2o4

In order to improve the electrochemical performance of LiCoO2 cathode in a high-voltage range of 3.0–4.5 V, spinel MgAl2O4 has been modified on the surface of LiCoO2 particle by a facile high-temperature solid state reaction.

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