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source:Industry News release time:2025-06-20 Hits: Popular:AG11 battery
Polymer batteries, also known as lithium - polymer batteries, have become increasingly popular in various electronic devices due to their high energy density, lightweight nature, and flexibility. Understanding their working principle is essential for appreciating their performance and applications. At the core of a polymer battery's operation are the electrochemical reactions that occur during charging and discharging processes.
During the discharging process, which is when the battery supplies electrical energy to a device, oxidation takes place at the anode. Typically, the anode of a polymer battery is made of a carbon - based material, such as graphite. Lithium ions stored in the anode material are released and migrate through the electrolyte towards the cathode. The electrolyte in polymer batteries is a solid or gel - like polymer matrix that contains lithium salts, enabling the movement of lithium ions while maintaining electrical isolation between the anode and cathode. As the lithium ions move through the electrolyte, electrons are simultaneously forced to flow through the external circuit, creating an electric current that powers the connected device.
At the cathode, reduction occurs. Common cathode materials include lithium - metal oxides like lithium cobalt oxide (LiCoO₂), lithium nickel manganese cobalt oxide (NMC), or lithium iron phosphate (LiFePO₄). When the lithium ions reach the cathode, they intercalate into the crystal structure of the cathode material, combining with the electrons that have traveled through the external circuit. This completes the electrochemical reaction, allowing the battery to deliver electrical energy.
The charging process is essentially the reverse of discharging. An external power source is connected to the battery, forcing electrons to flow back into the anode. Lithium ions are extracted from the cathode and migrate back through the electrolyte to the anode, where they are stored again. This process restores the battery's charge, enabling it to be used again for discharging. The efficiency of these charging and discharging processes depends on various factors, including the quality of the electrode materials, the conductivity of the electrolyte, and the design of the battery's internal structure. For example, a more conductive electrolyte allows for faster movement of lithium ions, improving the battery's rate performance, while high - quality electrode materials can store and release lithium ions more effectively, enhancing the battery's overall capacity and lifespan.
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