Since the negative electrode exists in the form of a lithium-carbon compound (lithium-encrusted graphite) or a lithium-silicon alloy, their chemical properties are very active. They react with water to generate hydrogen and release a large quantity of it at the same time. of heat, causing the negative electrode and hydrogen in the air to burn.
Lithium batteries are composed of positive and negative electrodes, electrolytes, separators and packaging materials. When a lithium battery is charged, lithium from the positive electrode flows to the negative electrode and is integrated into the graphite negative electrode sheets to form a lithium-carbon compound or form a lithium-alloy silicon with silicon.
Whether it is a lithium-carbon compound or a lithium-silicon alloy, they are very active chemicals and can react with water and oxygen. Reactwith water will violently generate heat and release hydrogen, causing the pole piece to burn and hydrogen into the air.
A fully charged lithium battery (cell phone battery) may catch fire (continuously smoke) and explode during the scraping process (it should take less than 30 seconds from fire to explosion), and it will be directly scratched. I've never seen or heard of throwing it in water, but I think that will allow the water to conduct the electricity first and not burn, but the temperature of the battery itself will continue to heat in water and will eventually cause an explosion.