Abstract
It is important to have high-performance SEI on anode surface by electrochemical reactions in applications of lithium ion batteries. Characteristics such as thickness, composition and stability at high temperature all affect battery performance. Furthermore, the moisture inside the batteries is also highly influential on cycle-ability, which results in manufacturing processes requiring dry room or glove box (relative humidity < 5%). Therefore, we always need additional cost to control the moisture.This research aims to find out how to improve discharge capacity, irreversibility, c-rate test and cycle life at room and high temperature regarding water uptake in lithium ion batteries by choosing a new additive in electrolyte. In addition, the relation between compositions, thickness variations and formation mechanism of SEI film and different functional groups of anode materials in different solvents are also studied. By using this binary additive (MI/H2O), lithium ion batteries could achieve not only a higher energy density, but the attendant manufacturing costs in terms of power consumption of dry room and the storage costs associated with lost-aging are significantly reduced.