Electrochemistry is a branch of chemistry, study of the relationship between electricity and chemical reactions. This branch of chemistry is deeply related with real life. Battery, solar cell, metal coating, and so on. Especially battery -or energy storage system- is important subject of electrochemistry, and also hot topic in industry. Development of battery can solve/improve many issues currently industry face to. State of art smartphone, electric automobiles, drone, grid energy storage for eco-energy sources... most of high-tech industries require the safe battery has higher energy density and output. Therefore, the introduction of electrochemistry will focus on the knowledge to understand battery. Redox Redox refers to red uction-ox idation, which involves electron transfer between molecules or ions. It is important concept, and all of principles of electrochemistry are based on this type of chemical reaction. Also it is notable that reduction and oxidation occurs at
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