Electrochemical Evaluation of Active Materials for Lithium Ion Batteries by One (Single) Particle Measurement

A one (single) particle measurement was employed to estimate electrochemical parameters of active materials for lithium ion batteries in order to design porous electrodes and cells. A micro electrode was used as a current collector for LiCoO2 and graphite particles. In the cases of materials with large expansion and shrinkage during discharge and charge process, a tweezers-type current collector was developed and applied to the measurement. Si particle as an anode material for post lithium ion batteries was measured by using a tweezers-type current collector to stabilize a contact between active material and current collector. Successfully, the tweezers-type current collector provided a stable contact to the active material particle. The electrochemical parameters for various active materials were obtained from the one (single) particle measurement. Based on these parameters, the porous electrode and lithium ion cell can be designed. (C) The Electrochemical Society of Japan, All rights reserved.