scholarly journals Enhancing Lithium Manganese Oxide Electrochemical Behavior by Doping and Surface Modifications

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 456
Author(s):  
Alexandru-Horaţiu Marincaş ◽  
Petru Ilea
Keyword(s):  
Surface Modification ◽  
Manganese Oxide ◽  
Lithium Ion ◽  
Electrolyte Solutions ◽  
Lithium Manganese Oxide ◽  
Lithium Ions ◽  
High Discharge ◽  
Lithium Manganese ◽  
Better Than ◽  
Comprehensive Study

Lithium manganese oxide is regarded as a capable cathode material for lithium-ion batteries, but it suffers from relative low conductivity, manganese dissolution in electrolyte and structural distortion from cubic to tetragonal during elevated temperature tests. This review covers a comprehensive study about the main directions taken into consideration to supress the drawbacks of lithium manganese oxide: structure doping and surface modification by coating. Regarding the doping of LiMn2O4, several perspectives are studied, which include doping with single or multiple cations, only anions and combined doping with cations and anions. Surface modification approach consists in coating with different materials like carbonaceous compounds, oxides, phosphates and solid electrolyte solutions. The modified lithium manganese oxide performs better than pristine samples, showing improved cyclability, better behaviour at high discharge c-rates and elevated temperate and improves lithium ions diffusion coefficient.

Preparation of cathode active materials for lithium ion secondary batteries utilizing microwave irradiation: Part II. Electronic structure of lithium manganese oxide

2004 ◽  
Vol 19 (8) ◽  
pp. 2421-2427 ◽  
Author(s):  
Shota Kobayashi ◽  
Tatsuya Usui ◽  
Hiromasa Ikuta ◽  
Yoshiharu Uchimoto ◽  
Masataka Wakihara
Keyword(s):  
Electronic Structure ◽  
Microwave Irradiation ◽  
Manganese Oxide ◽  
Irradiation Time ◽  
Lithium Ion ◽  
Lithium Manganese Oxide ◽  
X Ray ◽  
Lithium Manganese ◽  
Before And After ◽  
Diffraction Patterns

The microwave irradiation technique (MWIT) was applied to synthesize lithium manganese oxide having spinel structure using LiOH·H2O and ε–MnO2 as starting materials. The crystal and electronic structure depends on the irradiation time; x-ray diffraction patterns of the sample irradiated for 9 min were in good agreement with that of cubic structure without showing the peak of MnO2. The electronic structure of synthesized samples before and after lithium ion intercalation and/or deintercalation was investigated by Mn L-edge and O K-edge x-ray absorption spectroscopy.

The Effect of SnOx as the Protective Layer for the Lithium Manganese Oxide Thin Film

2007 ◽  
Vol 124-126 ◽  
pp. 1047-1050
Author(s):  
Hee Soo Moon ◽  
Jae Hun Yang ◽  
Jae Ho Lee ◽  
Seung Ho Ahn ◽  
Jong Wan Park
Keyword(s):  
Thin Film ◽  
Manganese Oxide ◽  
Protective Layer ◽  
Lithium Ion ◽  
Liquid Electrolyte ◽  
Oxide Thin Film ◽  
Lithium Manganese Oxide ◽  
Radio Frequency Magnetron Sputtering ◽  
Spinel Limn2o4 ◽  
Lithium Manganese

Lithium manganese oxide (LiMn2O4) had been a promising material for lithium-ion and thin film batteries. However, the LiMn2O4 had some problems such as the manganese dissolution into liquid electrolyte. In order to improve cycleability, we introduced SnOx layer as protective layer. This layer was deposited on spinel LiMn2O4 by using radio frequency magnetron sputtering. The deposited SnOx layer fully covered the LiMn2O4 , and didn’t make a change the crystallinity of the spinel films. The SnOx layer prevented direct contact of liquid electrolyte and improved the cycle retention.

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