There are several types of Li-ion batteries . The three letter codes are manufacturer codes, and used predominantly because they are easier to deal with than the longer naming conventions and have become a somewhat standard way to refer to the different types of cells. ICR and IMR cells are the most common types used and discussed here.
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ICR = lithium cobalt oxide cylindrical cell
I = lithium ion
C =cobalt oxide cathode
R = round cell type
(note- proper IEC nomenclature for ICR secondary cells actually reads more like: carbon negative electrode, organic electrolyte, lithium cobalt oxide positive electrode, cylindrical cell. I’m just trying to simplify it some here)
ICRs are also sometimes called “LiCoO2” or “LCO” or “Li-cobalt”
IMR = lithium manganese oxide cylindrical cell
I = lithium ion
M =manganese oxide cathode
R = round cell type
IMRs are also sometimes called “LiMn2O4” or “LMO” or “Li-Manganese”
IFR = lithium iron phosphate cylindrical cell
I = lithium ion
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F = iron phosphate cathode
R = round cell type
IFRs are also sometimes called “LiFePO4” or “LFP” or “Li-Phosphate”
These have a significantly lower nominal voltage (3.3v), and generally aren’t suggested for use in PVs of common design. Also, they require a special charger and have fairly low energy density. I just include them here as an overview of common battery types
INR = lithium iron phosphate cylindrical cell
I = lithium ion
N =nickel/manganese oxide cathode
R = round cell type
INRs are also sometimes called “LiNiMnCoO2” or “NMC”
Differences to note between ICR and IMR:
ICRs have a higher specific energy density than IMRs (higher mAh rating), but also a higher internal resistance and lower peak load current. They also suffer from a lower thermal runaway threshold than IMR at a full 4.2v charge (130–150C°C vs 170–180°C)
18650 batteries are popular with consumers because they are rechargeable and have a higher capacity than other types of batteries. They are commonly used in high-performance devices such as flashlights, laptops, and so on.
But you may not know that there are actually different types of 18650 batteries, including IMR, ICR and INR. Next, we will introduce these three batteries and the differences between them.
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