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source:Industry News release time:2025-05-17 Hits: Popular:AG11 battery
Liquid lithium - ion batteries operate based on the reversible movement of lithium ions between the positive and negative electrodes through an electrolyte solution, accompanied by corresponding electron transfer in the external circuit to generate electrical energy. This process can be divided into charging and discharging stages, each involving complex electrochemical reactions.
Charging Process: When a liquid lithium - ion battery is connected to a power source for charging, an external electrical potential forces lithium ions to move from the cathode (positive electrode) to the anode (negative electrode). At the cathode, lithium - containing transition - metal oxide materials, such as lithium cobalt oxide (it), undergo an oxidation reaction. Lithium ions are extracted from the crystal lattice of the cathode material and enter the electrolyte solution. For example, in the case of it, lithium ions (\(Li^+\)) are released, and the cobalt ions in the crystal lattice are oxidized to a higher valence state, while electrons are left behind in the cathode and flow through the external circuit to the anode.
The electrolyte, which is a liquid solution containing lithium - salt dissolved in an organic solvent, serves as the medium for lithium - ion transport. The lithium ions in the electrolyte diffuse through the separator, a porous membrane that prevents direct electrical contact between the anode and cathode while allowing ion passage. Once the lithium ions reach the anode, which is typically made of graphite or other carbon - based materials, they are intercalated into the graphite layers. This intercalation process is a physical - chemical reaction where lithium ions are inserted between the layers of the graphite structure, forming a lithium - graphite intercalation compound. At the same time, the electrons that have traveled through the external circuit are used to balance the charge, ensuring electrical neutrality in the battery system.
Discharging Process: During the discharging process, the battery acts as a power source, and the chemical energy stored in the battery is converted into electrical energy. The intercalated lithium ions in the anode are de - intercalated and re - enter the electrolyte solution. As the lithium ions move back through the electrolyte and separator towards the cathode, an oxidation - reduction reaction occurs. The electrons in the anode are released and flow through the external circuit to the cathode, powering the electrical device connected to the battery. When the lithium ions reach the cathode, they are re - inserted into the crystal lattice of the cathode material, and the cathode material is reduced back to its original state. This continuous movement of lithium ions and electron transfer in the external circuit provides a stable electrical current, enabling the battery to supply power to various devices.
The entire process of lithium - ion movement and electron transfer in liquid lithium - ion batteries is highly reversible, allowing the battery to be repeatedly charged and discharged. However, over time, side reactions may occur, and the structure of the electrode materials may degrade, gradually reducing the battery's capacity and performance.
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