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Home Georgian Technologies Promising Cathode Materials Based on Lithium Manganese Spinels for 5v Li-Ion Accumulators

Promising Cathode Materials Based on Lithium Manganese Spinels for 5v Li-Ion Accumulators

Description

The group of scientists of R.Agladze Institute of Inorganic Chemistry and Electrochemistry developed composite (doped) LiMexNi0.5-xMn1.5O4 - type (Me – Co, Ni, Cu, Al) materials based on manganese compounds that are significantly cheaper and less toxic than cobalt and nickel oxides used in commercial lithium power sources. According to test results, developed materials provide high electrochemical and cycling characteristics as cathode materials for 5VLi-ion accumulators. The advantages of developed method, in comparison with method used in practice, are simplification and reduction of technological process as well as obtaining of phase pure product with nano-sized particles. Synthesized compounds are characterized with cubic syngony similar to lithium manganese spinel LiMn2O4. The optimal ratio of stoichiometric LiMn2O4 spinel was established: LiMexNi0.5-xMn1.5O4, where 0 ≤ x ≤ 0.3. Spinel with this ratio shows high discharge characteristics and low degradation during cycling in 5V ragion.

Innovative Aspect and Main Advantages

The novelties of developed cathode material are:

  • Modified structure;
  • Phase purity;
  • Homogeneity;
  • Nano-size particles.

Due to mentioned properties, developed compounds could be considered as promising cathode materials for next generation lithium-ion batteries.

Main advantages include:

  • Usage of ecologically pure and cheap reagents;
  • Simple synthesis methods;
  • Receiving of cation substituted cathode materials, that can provide with significantly high energy density under high working potential (5V), than 4V LiMn2O4.

Areas of Application

It can be used in:

  • Power sources, including lithium-ion accumulators, for consumers with high rate capability and high energy density (objects of space and military technique, all kind of vehicles, including commercial transport);
  • Portable equipment.

Table 1. Diffraction characteristics of LiCo0.2Ni0.3Mn1.5O4 in comparison with LiMn2O4

Stage of Development

Cubic spinel type compounds with nano-size particles – LiMexNi0.5-xMn1.5O4, where Me – Co, Cu, Al; 0 ≤ x ≤ 0.5 were synthesized. These compounds were tested as 5V cathode materials for Li-ion accumulators via laboratory tests. LiCo0.2Ni0.3Mn1.5O4 was serving as prototype available for testing. Patenting documents are under preparation. Search for partners for further cooperation is underway.

Contact Details

R.Agladze Institute of Inorganic Chemistry and Electrochemistry
11 Mindeli str. 0186 Tbilisi, Georgia
Tel.: (+995 32) 25 8165
Fax: (+995 32) 30 1430
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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