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What are the differences between primary batteries and secondary batteries?

15 July 2021


Kingbo Power Technology

What are the differences between primary batteries and secondary batteries

 

The main difference is that the active material is different. The active material of the secondary battery is reversible, while the active material of the primary battery is not. The self-discharge of the primary battery is much smaller than that of the secondary battery, but the internal resistance is much larger than that of the secondary battery, so the load capacity is lower. In addition, the mass-specific capacity and volume-specific capacity of the primary battery are larger than those of general rechargeable batteries.

 

What is the electrochemical principle of lithium-ion batteries

 

The main component of the positive electrode of the lithium-ion battery is LiCoO2, and the negative electrode is mainly C. When charging,


Positive electrode reaction: LiCoO2 → Li1-xCoO2 + xLi+ + xe-

 

Negative reaction: C + xLi+ + xe- → CLix

 

Total battery reaction: LiCoO2 + C → Li1-xCoO2 + CLix

 

The reverse reaction of the above reaction occurs during discharge.

 



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What are the differences between primary batteries and secondary batteries?