18650 rechargeable battery lithium 3.7v 3500mah
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18650 rechargeable battery lithium 3.7v 3500mah
18650 rechargeable battery lithium 3.7v 3500mah

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Introduction to Safety Performance of Lithium Ion Batteries

release time:2023-10-07 Hits:     Popular:AG11 battery

  

  Lithium iron phosphate battery

  The theoretical capacity is 170mAh/g, and the actual achievable capacity of the material is 160mAh/g. In terms of safety, lithium iron phosphate has high thermal stability and low electrolyte oxidation ability, resulting in high safety; But the defects are low conductivity, large volume, high electrolyte usage, and poor consistency of the battery due to its large capacity.

  Lithium cobalt oxide battery

  The biggest feature in preparation is that after being fully charged, there is still a large amount of lithium ions left in the positive electrode, which means that the negative electrode cannot accommodate more lithium ions attached to the positive electrode. However, in an overcharged state, the excess lithium ions on the positive electrode will still swim towards the negative electrode, which cannot fully accommodate and change back to form metal lithium on the negative electrode. As metal lithium is a dendritic crystal, it is called dendrite. Once dendrite is formed, This will provide an opportunity to puncture the diaphragm, which will create an internal short circuit. Due to the fact that the main component of the electrolyte is carbonate, with lower flash and boiling points, it can burn or even explode at higher temperatures. Controlling the formation of lithium dendrites is relatively easy on small capacity lithium batteries, so lithium cobalt oxide batteries are currently limited to small capacity batteries such as portable electronic devices and cannot be used for power batteries.


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