Lithium cobalt oxide accounts for 30% of the cost of a lithium-ion battery. Air, however, is free.
锂钴氧化物的成本占到锂离子电池的30%，而空气却是免费的。
A lithium-air battery pulls oxygen from the air for its charge, so the device can be smaller and more lightweight.
锂空气电池从空气中吸收氧气充电，因此这种电池可以更小、更轻。
Andrews air cell. Oxygen drawn from the air reacts within the porous carbon to release the electrical charge in this lithium air battery.
在这种STAIR电池的原理图中，从空气里抽取的氧气与电池里的锂离子在多孔碳材内部发生反应，并释放出电流。
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