литий-марганцевая шпинель

The protective properties of the coating applied to the surface of lithium-manganese spinel (LiMn2O4), using the eutectic composition of Li2O : B2O3 = 47 : 53 (wt.) with the melting point of 650°C, were studied. The content of the eutectic lithium borate varied from 1% to 10%. The electrochemical behavior of the obtained materials in the cathode half-cells of lithium-ion battery was studied at room temperature.

The methods of increasing performances of cathode materials based on lithium-manganese spinel are discussed in this review. Next questions are examined: the reasons of LiMn₂O₄ degradation and the basic variants of problem solving including the doping of spinel matrix by metal cations; the substitution of oxygen in system Li–Mn–O by another anions; the creation of protective shell on the surface of particles; the preparation of different composites. The possibility of working substitution's spinel matrixes in 5 V domain are demonstrated.

УДК 541.136

DOI:  https://doi.org/10.18500/1608-4039-2016-16-1-34-41

The paper presents the results of the study of phase composition and electrochemical performance of lithium-manganese oxide spinel with excess lithium of nominal composition of Li_{1 + x}Mn₂O₄ obtained by solid-phase method. It was established that samples with x = 0.1 and 0.2 were composite materials with LiMn₂O₄ being the basic phase and Li₂MnO₃ being the impurity (3 and 7 mas.%, respectively) also comprising trace amounts of MnO₂.