Lithium batteries are a type of battery that uses lithium metal or lithium alloys as the negative electrode material and a non-aqueous electrolyte solution. Lithium-ion batteries use carbon materials as the negative electrode and lithium-containing compounds as the positive electrode. Depending on the positive electrode compound, common lithium-ion batteries include ternary lithium-ion batteries, lithium manganese oxide batteries, and lithium iron phosphate batteries.
1. Ternary lithium-ion batteries
The ternary lithium-ion battery we commonly refer to is actually a ternary polymer lithium-ion battery. It means a lithium-ion battery that uses ternary cathode materials, such as lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminum oxide. Ternary lithium-ion batteries have higher capacity, better cycle life, and better rate discharge performance.
The disadvantages are as follows: it is the most expensive of the three materials, and it has no advantage in safety performance. Currently, most lithium-ion batteries involved in explosions use ternary lithium-ion batteries.
2. Lithium iron phosphate battery
Lithium iron phosphate batteries are lithium-ion batteries that use lithium iron phosphate as the positive electrode material. They have good safety performance, high cycle life (around 1500 cycles), and good high-temperature performance.
Lithium iron phosphate batteries are generally considered to be green and environmentally friendly batteries that do not contain any heavy metals or rare metals and are non-toxic and pollution-free. The industry's optimism about lithium iron phosphate batteries stems primarily from environmental considerations.
Of course, lithium iron phosphate also has its disadvantages: for example, it is not cheap, its low-temperature performance is poor, and its capacity is small for the same volume and weight.
3. Lithium manganese oxide battery
As the name suggests, lithium manganese oxide batteries use lithium manganese oxide as the positive electrode material, and lithium manganese oxide is one of the more promising lithium-ion positive electrode materials. Lithium manganese oxide batteries are widely used due to their advantages such as low cost, no pollution, high safety, and good rate performance. In addition, lithium manganese oxide has excellent low-temperature performance, achieving a discharge efficiency of over 90% at temperatures as low as -20 degrees Celsius.
The disadvantages of lithium manganese oxide include poor high-temperature performance and a tendency to swell; a relatively short cycle life (typically around 300 to 400 cycles); and inherent instability, easily decomposing to produce gas. Therefore, it is often used in combination with other materials to reduce cell costs. Its poor cycle performance and electrochemical stability significantly limit its industrialization.
Summary and comparison:
In terms of safety, lithium iron phosphate and lithium manganese oxide batteries are safer than the other two types. In terms of capacity, ternary lithium and lithium manganese oxide batteries are superior. Lithium iron phosphate batteries have the longest cycle life, while lithium manganese oxide batteries have significant advantages in production cost and operating temperature.
