Let's Talk About The Lithium Ion Battery

Lithium-ion battery: It is a secondary battery (rechargeable battery), which mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. In the process of charging and discharging, Li + intercalates and deintercalates between the two electrodes: when charging, Li + deintercalates from the positive electrode intercalates into the negative an electrode through the electrolyte and the negative electrode is in a lithium-rich state; the opposite is exact during discharge.

Lithium batteries are divided into lithium batteries and lithium-ion batteries. Mobile phones and laptops use lithium-ion batteries, which are commonly known as lithium batteries. The battery generally uses a material containing lithium as an electrode, which is a representative of modern high-performance batteries. The real lithium battery is rarely used in daily electronic products due to its great danger.

Lithium Iron Phosphate Battery Rack Manufacturer talked about lithium-ion batteries that use carbon materials as negative electrodes and lithium-containing compounds as positive electrodes. There is no metal lithium, only lithium ions. This is a lithium-ion battery. Lithium-ion battery refers to a general term for a battery that uses lithium-ion intercalation compound as a positive electrode material. The charging and discharging process of a lithium-ion battery is the process of intercalation and deintercalation of lithium ions. In the process of intercalation and deintercalation of lithium ions, it is accompanied by intercalation and deintercalation of electrons equivalent to lithium ions. In the process of charging and discharging, lithium ions are intercalated/deintercalated and intercalated / deintercalated between the positive and negative electrodes, which is called the "rocking chair battery".

Lithium-Ion Battery Cabinet

When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon used as the negative electrode has a layered structure, and it has many micropores. The lithium ions reaching the negative electrode are inserted into the micropores of the carbon layer. The more lithium ions inserted, the higher the charging capacity. Similarly, when the battery is discharged (that is, the process we use the battery), the lithium ions embedded in the carbon layer of the negative electrode are extracted and moved back to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity.

Generally, the charging current of a Lithium-Ion Battery Cabinet is set between 0.2C and 1C. The larger the current, the faster the charging and the greater the battery heat. Moreover, if the current is too large to charge, the capacity is not full, because the electrochemical reaction inside the battery takes time. Just like pouring beer, if it is poured too quickly, it will produce foam, but it will not be full.

For batteries, normal use is the process of discharging. Lithium battery discharge needs to pay attention to several points: the discharge current should not be too large, the excessive current will cause internal heating of the battery, and may cause permanent damage. On mobile phones, this is no problem, and you can ignore it. For example, Li-Ion Battery Pack for E-Rickshaw must not be over-discharged. The internal storage of electrical energy in lithium batteries is achieved by a reversible chemical change in electrochemistry. An excessive discharge will cause irreversible reactions to this chemical change. Therefore, lithium batteries are most afraid of over-discharge. Once the discharge voltage is lower than 2.7V, The battery may be scrapped. Fortunately, the protection circuit has been installed inside the battery of the mobile phone and the voltage has not been lowered to the extent of damaging the battery, the protection circuit will work and stop discharging.