Jiri Vondrak

Incorporation of Multielement Doping into LDH Structure of Alpha Nickel Hydroxide

Reffered-to work was aimed at clarifying of the reasons for its transformation tendency with the aim of finding a proper inhibition method. Based on our former experience with an individual-elements doping, simultaneous incorporation of the selected elements into brucite type lattice of nickel hydroxide appears to be suitable solution for fulfilment of the purpose.

Elimination of irreversible effects during first charging of lithium battery anodes

The irreversible capacity of negative electrode in a lithium-ion cell is a widely described the phenomenon. Irreversible capacity losses are connected with formation of a solid electrolyte interface layer. This layer is growing on the electrode-electrolyte interface during first several charging cycles. The layer is indispensable for proper functioning of a lithium-ion cell. However, during this layer formation, the atoms of lithium are consumed in a range from 18 to 45% of the total amount of lithium atoms presented in cell. Demonstration of possibilities to suppress this phenomenon that occurs on a negative electrode interface is the main aim of this paper.

Review on Electrodes with Extended Surface Area for Supercapacitors

This contribution offers an outline of simplified theories describing processes occurring in porous and nanostructured electrodes, their properties from the view if impedance spectroscopy and their application in electrochemical supercapacitors. Many electrode materials possess multi-level structures starting with macroporosity and ending with nanostructures. Differences as well as similarities between capacitor electrodes and intercalation electrodes will be emphasized. Examples of will be given. Introduction

Measurement and processing of relaxation times T 1 and T 2 during the UV polymerization process

In this paper are introduced basic magnetic resonance (MR) methods for measuring the properties of the conductive gel structure during polymerization, particularly relaxation times T<inf>1</inf>, T<inf>2</inf>. Gel electrolytes based on the NaClO<inf>4</inf> inorganic salt was measured. The measurement deals with ²³Na nuclei. In our case to measure relaxation time T<inf>2</inf>, the Hahn echo was used. To measure relaxation time T<inf>1</inf>, the IR techniques (Inversion Recovery) was used. The value of relaxation time T<inf>2</inf> is obtained by approximation of spectral lines and the value of relaxation time T<inf>2</inf> is obtained by approximation of spin echo decline signal with two exponentials using a genetic algorithm for both times. The change of relaxation times T<inf>2</inf> and T<inf>1</inf> of ²³Na nuclei during polymerization process indicate a change in the internal structure and chemical composition of gel electrolytes based on NaClO<inf>4</inf>.