What Is A Li-ion Battery? What Are Its Components?


1. What's the difference between a primary battery and a rechargeable battery?

The internal electrochemistry of the battery determines whether this type of battery is rechargeable or not. According to their electrochemical composition and electrode structure, the reaction between the internal structure of a real rechargeable battery is reversible.

2. Are there any other differences between primary and secondary batteries?

Another obvious difference is that their energy and load capacity, as well as self-discharge rate, secondary battery energy is much higher than primary battery, but their load capacity is relatively small.

3. What are the pros and cons of rechargeable portable batteries?

Rechargeable batteries have a long life and can be recycled more than 1000 times. Although they are more expensive than dry batteries, they are more cost-effective if they are often used. Rechargeable batteries have a lower capacity than alkaline manganese or zinc-carbon batteries of the same specification; for example, they discharge faster.

4. What is a Li-ION battery?

Li-ion is a development of lithium batteries. So before we talk about Li-ION, let's talk about lithium batteries. The buckle batteries used in cameras, for example, are lithium batteries. The anode material of lithium batteries is lithium metal and the anode is carbon. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move through the electrolyte to the negative electrode. As a negative electrode, carbon has a layered structure with many micropores. Lithium ions that reach the negative electrode are embedded in the micropores of the carbon layer. The more lithium ions embedded, the higher the charging capacity. Similarly, when a battery is discharged (the process by which we use batteries), the lithium ions embedded in the carbon layer of the negative electrode escape and move back to the positive electrode. The more lithium ions returned to the positive electrode, the higher the discharge capacity. We usually refer to the battery capacity as the discharge capacity. In the process of Li-ion charging and discharging, lithium ion moves from positive electrode to negative electrode to positive electrode. Li-ion is like a rocking chair, with two poles of a battery at each end, and Li-Ion is like an athlete running back and forth in the chair. That's why Li-Ion is also called a rocking chair battery.

5. What are the components of the Li-ION battery?

(1) The top and bottom cover of the battery (2) the positive electrode -- the active material is lithium cobalt oxide (3) diaphragm -- a special composite membrane

(4) Negative electrode -- the active material is carbon (5) organic electrolyte (6) battery shell (divided into steel shell and aluminum shell)

6. What are the advantages of Li-ION batteries? What are the disadvantages?

Li-ion has the following advantages:

1) The working voltage of a single battery is as high as 3.6-3.8V.

2) The specific energy is large, the actual specific energy can be achieved at present is 100-115Wh/kg and 240-253Wh/L (2 times of NL-CD, 1.5 times of NI-MH), with the development of technology in the future, the specific energy can be up to 150Wh/kg and 400Wh/L.

3) Long cycle life, generally can reach more than 500 times, even 1000 times. For low-current discharge appliances, the life of the battery will double the competitiveness of the appliance.