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We want to use a current lithium ion secondary battery for a long time. Therefore high capacity is indispensability
We use lithium and an organic electrolyte. Therefore it is secured safety of a power supply simple substance
A hybrid with the device that an early charge electric discharge in a battery simple substance or an early charge electric discharge is possible

Figure.3 SEM of an electrode

Figure.2 Model of Lithium Ion Secondary Battery

The secondary battery which uses lithium metal for a cathode was manufactured first in 1980's, but carbon materials are used for lithium component metal oxide (LiCoO2, LiMnO2, LiNiO2), a cathode in an anode now.

Carbon materials were adopted instead of lithium metal used for a cathode in the early days and therefore I stored up lithium with a form of compound (Li-GIC) between the class of graphite which they took lithium ion in between carbon hexagon network planes and I was remarkable and am able to have come to raise safety without I was original, and a problem and a dendrite (an arborization deposit) of the lithium metal that it was it occurring.

In addition, greatest theory capacity 372mAh/g (composition-type LiC6;) of Li-GIC The carbon body which they can store up lithium of high capacity to be far beyond first stage) is found, and small size lightweighting of a battery, high capacity are going to advance more.

Figure.1 Energy Density of Secondary Battery

An energy density is high (about 1.5 times (Wh/l) of a Ni - Cd battery or 2 times (Wh/kg)) Cf. ※Figure.1参照
High voltage (3.6V) movement(About 3 times of a Ni - Cd battery and a Ni-MH battery)
Economic life is long for a cycle
There is not memory effect to be seen in Ni-cd batteries(As for the lithium ion battery, a recharge in the use middle is possible)
Because a chemical change is not caused between an electrolyte and an electrode, there are few electronic losses, and there is little self-discharge(The 10% moon following)
The residual quantity indication which the detection of a residual quantity becomes simple because an electric discharge characteristic is slow and changes continually, and is correct with PCs is possibility

In late years,　Electronics are phenomenally small,　light weight,　and enhanced performance progress .And the spread of mobile devices such as a mobile telephone and a note PC suddenly spreads.Because an electronic device and high efficiency of a secondary battery contribute greatly.
The secondary battery which is demanded in a recent electronics markethas a high energy density(Wh/l, Wh/kg) and be to be able to contribute to small size of the whole machinery and lightweighting.Above all, a lithium ion secondary battery has the following good point as mobile electronics use in comparison with various secondary batteries.