Lithium-ion battery - definition
Lithium-ion battery - definition
Lithium-ion battery is a type of electric battery in which energy is stored and released as a result of the reversible flow of lithium ions between electrodes – anode and cathode – through the electrolyte. In the charged state, lithium ions are mainly located in the anode, most often made of graphite. During discharge, the ions migrate through the electrolyte to the cathode, usually made of lithium metal oxides, and the accompanying flow of electrons through the external circuit constitutes useful electric current.
Lithium-ion technology is distinguished by high energy density, low self-discharge effect, and a large number of charge and discharge cycles while maintaining relatively stable parameters. Thanks to these properties, this type of battery has found widespread use in portable electronics, wireless tools, electric vehicles, and stationary energy storage systems.
The electrolyte in lithium-ion batteries is usually in the form of an organic liquid containing lithium salts, but semi-solid and solid versions are also being developed to increase chemical safety. To limit the risk of overheating or cell ignition, advanced battery management systems are used to control voltage, current, and operating temperature.
A characteristic feature of this type of battery is also high energy efficiency, low weight relative to capacity, and the absence of a memory effect, making them more flexible in use than older technologies such as nickel-cadmium. However, sensitivity to deep discharge, overcharge, and extreme temperatures requires the use of protective systems, both at the level of individual cells and entire battery packs.
Advancements in lithium-ion battery technology focus on improving chemical stability, increasing energy capacity, and reducing production costs, which is crucial for the development of sustainable energy technologies.
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