As graphite can charge only 1 lithium atom per 6 carbon atoms, a lot of space in the anode material had to be allocated to carbon atoms. Graphite has a small charge capacity of 372 mAh/g, but the theoretical capacity of silicon is 4,200 mAh/g, which is 11 times higher, so efforts to introduce silicon into the anode material have continued for 20 years.
However, silicon has a problem of losing electrical conductivity by repeating three-fold volume expansion and contraction during charge and discharge. It comes down a silicon to 10nm size. Many people have been trying to solve the problem over the past 15 years.
4 per 1 Carbon Atoms
4200 mAh/g
1 per 1 Carbon Atoms
372 mAh/g
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We have started the development process with the three-dimensional structure modelling of the silicon-lithium bond. Our target is finding the cause and starting point of breakage during repeated expansion and contraction.
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