lithium-ion battery

The review summarizes literature data on the thermal decomposition of ferrous oxalate with the formation of Fe, FeO, Fe2O3, Fe3O4, Fe3C, and other products. Historical evolution of views on the ways and mechanisms of oxalate thermolysis is traced. The current state of the art is analyzed from the perspective of FeC2O4·2H2O compound for the synthesis of lithium iron phosphate LiFePO4, which is a promising cathode material for lithium-ion batteries.

The methods for the synthesis of lithium iron phosphate LiFePO4 with olivine structure have been developed. New materials based on lithium iron phosphate, including doped with metals, the «LiFePO4 + carbon» composites obtained by pyrolysis of organic compounds have been synthesized. Crystallographic characterization of the synthesized materials was carried out; their electrochemical characteristics of the extraction and intercalation of lithium have been identified.

A series of solid phases (mixed lithium-iron-manganese phosphates) of the common formula LiMnyFe1−yPO4 (0 ≤ y ≤ 1) with a carbon coating on the particle surface was synthesized by mechanochemical activation with carbothermal reduction. The synthesized mixed phosphates were examined as promising cathode materials for lithium-ion batteries. The positive effect of replacement of a rather small fraction of iron by manganese is shown, which improves the electrochemical performance at the rates C/10–10C.

Structure of thin-film electrodes manufactured by layer-by-layer magnetron sputtering of Si and Al in the environment with small oxygen additives has been studied. Charge-discharge behavior of these electrodes was studied as well. It is shown that such electrodes are able to stable cycling with marginal irreversible capacity. 

It is shown that the nonlinear structural model of the battery can be used for modeling the voltage relaxation processes after a charge of batteries. The solution obtained is valid for alkaline, acid and lithium-ion batteries. Comparison of solutions, with the experimental data for nickel-cadmium batteries, showed, that the relative error does not exceed 3%.

At this paper algorithms of accessible and full capacity estimation are presented. The model discrete parameter interpolation, based on spline function is shown. Presented algorithms are analyzed for use in real-time applications. 

The question of replacing the widely used electrolyte based on lithium hexafluorophosphate (LiPF6) has been increasingly raised recently, due to the latter being environmentally unfriendly and toxic. The review of studies published since 2002 presents various methods for obtaining LiBOB salt in detail, which is promising for use in electrolyte composition. The effect of adding LiBOB to the basic electrolyte salt (LiPF6) was analyzed. The advantages and disadvantages of using LiBOB salt as a basic component for various electrolytes were considered.

In the last decade, the use of lithium-ion batteries in transport, power engineering and industry has expanded. Batteries operate under the control of electronic battery management systems (BMS), one of the functions of which is balancing the cells in the battery. The article presents a method for imitational statistical modeling of charge-discharge cycles of lithium-ion batteries.

In this paper, we compare electrode composites based on Li3V2(PO4)3 and carbon according to their initial characteristics in the galvanostatic cycling mode and structural features. The composites were synthesized using carbon black or starch as carbon sources. The electrode material obtained using starch demonstrates a higher specific capacity, the stability of which is lower during cycling, while characterized by a smaller unit cell volume and a larger crystallite size.

Lithium-ion batteries with improved performance are increasingly in demand in various fields. Silicon-based materials are one of the most actively studied materials, because they allow increasing the discharge capacity of the anode. In this work, we continue studying the behavior of the thin-film silicon anodes inside the anode half-cell of a lithium-ion battery in the conditions of limited charge capacity to 1000 and 4000 mA·h/g.