LiFePO4 as a Material for the Potentiometric Sensor

Lithium iron phosphate is a rather unique material demonstrating good reversibility in charge-discharge cycles despite the presence of several consecutive stages of the process, including a phase transition

Electrodeposition of Polymer Electrolyte Into Porous LiNi0.5Mn1.5O4 for High Performance All-Solid-State Microbatteries

We report the electrodeposition of polymer electrolyte (PMMA-PEG) in porous lithium nickel manganese oxide (LiNi0.5Mn1.5O4) cathode layer by cyclic voltammetry. The cathode-electrolyte interface of the polymer-coated LNMO electrode has been characterized by scanning electron microscopy and electrochemical techniques. Electrochemical measurements consisting of galvanostatic cycling tests and electrochemical impedance spectroscopy revealed a significant improvement of the capacity values and the increase of the operating voltage. These effects are attributed to the total filling of pores by the electrodeposited polymer that contributes to improve the reversible insertion of Li+. A complete all-solid-state microbattery consisting of electropolymerized LNMO as the cathode, a thin polymer layer as the electrolyte, and TiO2 nanotubes as the anode has been successfully fabricated and tested

LiFePO4 as a Material for the Potentiometric Sensor

Lithium iron phosphate is a rather unique material demonstrating good reversibility in charge-discharge cycles despite the presence of several consecutive stages of the process, including a phase transition

SIMULATION OF INTERCALATION PROCESSES IN POORLY CONDUCTIVE MATERIALS

Currently, the search for new electrode materials for metal-ion batteries, based on the identification of crystal structures with ionic mobility and the ability for reversible intercalation process, often leads to materials with low conductivity, especially electronic. In fact, these are dielectric materials, a striking example of which are many polyanionic compounds. At the same time, these materials are often characterized by potentially attractive characteristics, such as low volume change during cycling, ease of synthesis, moderate values of specific capacity, and others

Superior Electrochemical Performance of Electropolymerized Self-Organized TiO2 Nanotubes Fabricated by Anodization of Ti Grid

International audienceSelf-organized Titanium dioxide (TiO2) nanotubes grown on Ti grid acting as anode for Li-ion microbatteries were prepared via an electrochemical anodization. By tuning the anodization time, the morphology and length of the nanotubes were investigated by scanning electron microscope. When the anodization time reached 1.5 h, the TiO2nts/Ti grid anode showed a well-defined nanotubes, which are stable, well-adherent ~90 nm with a length of 1.9 ± 0.1 μm. Due to their high surface utilization, surface area, and material loading per unit area, TiO2nts/Ti grid anode using polymer electrolyte exhibited a high areal capacity of 376 μAh cm−2 at C/10 rate and a stable discharge plateau at 1.8 V without using a polymer binder and conductive additive. The storage capacity of the TiO2nts/Ti grid after 10 cycles is 15 times higher compared to previous reports using planar Ti foils

Methods for Determination of the Degree of Iron Oxidation in LiFePO4

The disposal of LiFePO4 (LFP) cathode material through oxidation in an air atmosphere is explained by its high chemical activity and high surface area (especially for nanoparticles). In this article, new methods for the determination of the degree of iron oxidation in LFP (oxidation degree) are taken into consideration, specifically those which do not require complicated hardware support. The proposed methods are based on electrochemical oxidation (coulometric method) and chemical oxidation (chemical oxidation in alkaline and acidic solutions). As an arbitration method for analyzing the iron state, the method of Mössbauer spectroscopy (being the most proven and reliable method) was chosen. With respect to the proposed methods for determination of the oxidation degree, the most reliable and quick approach is the titrimetric method (oxidation in an acidic medium), which is in good correlation with Mossbauer spectroscopy. The coulometric method is also able to determine the material oxidation degree (with some approximation), but it requires a number of conditions in order to eliminate errors

SELECTING A MEMBRANE FOR SUPERCAPACITOR BATTERIES WITH WATER-BASED ELECTROLYTE

One of the important parts of the energy storage system is a separator, which has the function of separating the anode from the cathode. Despite the wide variety of existing materials, there are still ongoing developments to improve membrane properties such as: ionic conductivity, high porosity, chemical and electrochemical stability in the electrolyte, as well as the thickness of the material

BOOSTING MXENE CAPACITY BY SELF-OXIDATION IN AIR ATMOSPHERE FOR WATER-IN-SALT ELECTROLYTE BASED SUPERCAPACITOR

The use of Ti3C2Tx (MXene) electrodes for energy storage applications is gaining momentum in recent years. The ability of the MXene to host a large variety of mono and multivalent ions regardless of their charge or ionic radius makes it an attractive anode for aqueous and non-aqueous batteries and supercapacitor devices

REDUCED FORM OF PRUSSIAN BLUE (PRUSSIAN WHITE) CATHODE MATERIAL FOR APPLICATION IN TWO ELECTRODE SYSTEMS

With an increasing annual demand for energy storage devices there is a progressive attention on the research for rechargeable batteries. Even though traditional lithium-ion batteries offer great performance, they are unable to satisfy huge consumption worldwide, since the limits on availability of lithium resources. Sodium-ion batteries can be potential substitute for LIBs owing cost-effectivity and abundance of sodium salt