Role of oxygen on the formation of solid electrolyte interphase by online electrochemical mass spectrometry

概要

1.1 Brief Introduction of Li-ion Battery
In recent years, green energy with lower pollution and carbon dioxide
emission has become the common desire of many people worldwide. The use
of fossil energy is becoming less and less while natural renewable energy like
solar, hydro, wind, and geothermal power are gradually increasing in demand.
As energy storage devices, secondary batteries play the role of power
transportation tools to pass electricity between natural power and electric
devices in our daily life, such as smartphones, computers, and electro-vehicles.
Among the enormous batteries, lithium-ion battery (LIB) is the most commonly
used one for its high energy density, high open circuit voltage, long lifespan,
high stability, and nearly zero memory effect.1-3 The LIB works through the
“rocking chair” mode transportation of lithium ions between anode and cathode
(Seen in Figure 1). In the first cycling, Li-ions de-intercalate from the cathode
LiCoO2 that consists of lithium metal anode and titanium disulfide (TiS2)
cathode O2 and are transported to the anode, and then intercalate into the
graphite layers and form LiC6 compound during the charging process. While in
the discharging process, Li-ions move in the opposite direction. In the whole
cycling, the conductors inside the cell are Li-ions and the two electrodes do not
undergo a redox reaction in the usual sense instead of the Li-ion intercalation
and deintercalation. ...

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