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source:Industry News release time:2025-03-13 Hits: Popular:AG11 battery
Lithium - ion pouch batteries operate based on the movement of lithium ions between the anode and the cathode through an electrolyte. This process is reversible, enabling the battery to be charged and discharged.
1. Discharge Process
During discharge, which is when the battery is powering an external device, the anode, typically made of graphite, releases lithium ions. The lithium atoms in the graphite lattice oxidize, losing electrons. The lithium ions then move through the electrolyte, which is a lithium - salt - based solution, towards the cathode. The electrons, on the other hand, travel through the external circuit, creating an electric current that can be used to power devices such as smartphones, laptops, or electric vehicles.
The cathode in a lithium - ion pouch battery can be made of various materials, such as lithium - cobalt - oxide (LiCoO₂), lithium - nickel - manganese - cobalt - oxide (NCM), or lithium - iron - phosphate (LFP). As the lithium ions reach the cathode, they intercalate (insert) into the cathode material's crystal structure. For example, in a lithium - cobalt - oxide cathode, the lithium ions enter the layered structure of the LiCoO₂, causing a change in the oxidation state of cobalt. This process releases energy, which is harnessed as electrical energy in the external circuit.
2. Charge Process
When the battery is being charged, an external power source is connected. The process is essentially the reverse of discharge. An electric current is applied, which forces the lithium ions to move back from the cathode to the anode. At the cathode, the lithium ions are extracted from the crystal structure, and the electrons flow back through the external circuit to the anode. At the anode, the lithium ions recombine with the graphite lattice, reducing the graphite and storing the energy in the form of lithium - graphite intercalation compounds. This charging process restores the battery's capacity to be discharged again.
The electrolyte plays a crucial role in facilitating the movement of lithium ions between the anode and the cathode. It must have good ionic conductivity to allow for efficient ion transfer while being electrically insulating to prevent short - circuits. The separator, a thin porous membrane between the anode and the cathode, also ensures that the two electrodes do not come into direct contact, further preventing short - circuits and enabling the proper operation of the battery.
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