Lithium Ion Power Bank are easily confused with the following two batteries:
(1) lithium battery: metal lithium as the negative.
(2) Lithium Ion Power Bank: the use of non-aqueous liquid organic electrolyte.
(3) lithium-ion polymer battery: with a polymer to gel liquid organic solvents, or directly with all solid electrolyte. Lithium Ion Power Bank are generally graphite-based carbon material for the negative.
Lithium Ion Power Bank to carbon material for the negative, lithium-containing compounds for the positive, there is no lithium metal, only lithium-ion, which is Lithium Ion Power Bank. Lithium Ion Power Bank refers to the lithium ion embedded compounds for the cathode material battery in general. Lithium Ion Power Bank charge and discharge process, that is, lithium ion embedded and de-embedding process. In the process of intercalation and deintercalation of lithium ions, it is accompanied by the embedding and deintercalation of electrons equivalent to lithium ions (which are conventionally used for embedding or deintercalating, and the negative electrode is inserted or removed). In the charge and discharge process, lithium ions in the positive and negative between the reciprocating embedded / de-embedded and inserted / disassembled, is known as the "rocking chair battery."
When the battery is charged, the battery has a positive lithium ion generation, the generated lithium ions through the electrolyte movement to the negative. And the negative carbon as a layered structure, it has a lot of holes, to the negative lithium ions embedded in the carbon layer of the pores, the more lithium ions embedded, the higher the charge capacity. Similarly, when the battery discharge (that is, we use the battery process), embedded in the negative carbon layer of lithium ions out, and back to the positive pole. The higher the lithium ion, the higher the discharge capacity.
General Lithium Ion Power Bank charging current set between 0.2C to 1C, the greater the current, charging faster, while the battery heat is also greater. Moreover, the excessive current charge, the capacity is not enough, because the battery internal electrochemical reaction takes time. Just like pouring beer, pour too fast will produce a bubble, but dissatisfied.
Use (discharge) precautions
For the battery, the normal use is the discharge process. Lithium battery discharge need to pay attention to several points:
First, the discharge current can not be too large, too much current causes the battery inside the heat, may cause permanent damage. On the phone, this is no problem, you can not consider.
As can be seen from the right, the greater the battery discharge current, the smaller the discharge capacity, the voltage drop faster.
Second, absolutely can not discharge! Lithium battery internal storage power is achieved by a reversible chemical changes in electrochemical, excessive discharge will lead to this chemical change has an irreversible reaction occurs, so the lithium battery most afraid of over discharge, once the discharge voltage is lower than 2.7V, will May cause the battery to be scrapped. Fortunately, mobile phone batteries have been installed inside the protection circuit, the voltage is not as low as the extent of damage to the battery, the protection circuit will work to stop the discharge.