When the battery is charged, lithium ions are released from the lithium-containing compound on the positive electrode, and lithium ions move to the negative electrode through the electrolyte. The carbon material of the negative electrode has a layered structure with numerous micropores. The lithium ions that reach the negative electrode are integrated into the micropores of the carbon layer. The more lithium ions, the higher the charging capacity.
When the battery is discharged (that is, the process when we use the battery), the lithium ions embedded in the carbon layer of the negative electrode are released and return to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity. Battery capacity generally refers to discharge capacity.
During the charging and discharging process of lithium-ion batteries, the lithium ionsium are in a state of movement from the positive electrode → the negative electrode → the positive electrode. It's like a rocking chair. The two ends of the rocking chair are the battery poles, and the lithium ions move back and forth at both ends of the rocking chair. This is why lithium-ion batteries are also called rocking chair batteries.
Detailed information
The charging process of lithium-ion batteries is divided into two stages: constant current charging stage and decreasing charge at constant voltage current.
Excessive charging and discharging of lithium-ion batteries will result in permanent damage to the positive and negative electrodes. Excessive discharge causes the negative electrode carbon sheet structure to collapse, and the collapse will prevent lithium ions from being inserted during the charging process; overcharging causes too many lithium ions to be incorporated into the carbon structure of the negative electrode, causing some of the lithium ions to appear. is no longer released.
The best charging and discharging method for lithium-ion batteries to maintain their performance is shallow charging and discharging. Generally, 60% DOD is 2-4 times the life under 100% DOD conditions.
Baidu Encyclopedia - Lithium-ion Battery
When a lithium-ion battery is charged, the direction of movement of lithium ions is what?
Lithium ion batteryThe direction of movement of lithium ions during charging is that the lithium ions move from the positive electrode to the electrode negative. It's the process. to integrate lithium ions into carbon (petroleum coke and the negative electrode is formed in graphite (beats themTraditional lithium batteries use lithium or a lithium alloy as the negative electrode).
True lithium batteries are rarely used in daily electronic products due to their high risk. Petroleum coke and graphite are used as negative electrode materials, which are non-toxic and have sufficient resources. Lithium ions are embedded in carbon, which overcomes the high activity of lithium and solves the safety problems of traditional lithium batteries. can achieve the highest level in charging and discharging performance and service life. In short, the overall performance of lithium-ion batteries is improved. Lithium-ion batteries are expected to occupy a significant market in the 21st century.
Precautions for charging electronic devices with lithium
Lithium-ion batteries can be seen everywhere inpeople's lives, including various portable electronic products, vehicle GPS, etc. Lithium-ion batteries are becoming an important element in the operation of these tools. Keeping lithium-ion batteries properly charged and discharged can extend battery life. Keeping the lithium-ion battery power between 10% and 90% is conducive to protecting the battery. This means that when charging batteries of digital products such as mobile phones and laptops, it is not necessary to reach the maximum value.
If digital products equipped with lithium-ion batteries are exposed to sunlight or stored in hot cars, it is best to keep these products turned off because if the operating temperature exceeds 60 degrees Celsius, the lithium battery -ion will accelerate aging. Lithium battery charging temperature range: 0 ~ 45 degrees Celsius, t rangeLithium battery discharge temperature 0 ~ 60 degrees Celsius.
The direction of movement of lithium ions when charging a lithium-ion battery is: from the positive electrode to the negative electrode.
A lithium-ion battery is a secondary battery (rechargeable battery) that relies primarily on the movement of lithium ions between positive and negative electrodes to function.
The charging and discharging process of lithium-ion batteries is the process of intercalation and deintercalation of lithium ions. 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 via the electrolyte. Likewise, when the battery is discharged, the lithium ions embedded in the carbon layer of the negative electrode are released and return to the positive electrode.