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Which is better, 18650 lithium ion battery 3.7v phosphate battery or ternary lithium battery?
At present, new energy vehicle power batteries all use lithium-ion batteries. Lithium-ion batteries can be divided into two types: 18650 lithium ion battery 3.7v phosphate batteries and ternary lithium batteries. However, most consumers are laymen and they can’t figure out which one is better, 18650 lithium ion battery 3.7v phosphate battery or ternary lithium battery? Let’s explain in detail the difference and lifespan of 18650 lithium ion battery 3.7v phosphate batteries and ternary lithium batteries.
What is 18650 lithium ion battery 3.7v phosphate battery?
18650 lithium ion battery 3.7v phosphate battery is a type of lithium-ion battery, which is characterized by safety, stability, high temperature resistance and excellent circulation characteristics.
What is a ternary lithium battery?
Ternary lithium batteries are also called "ternary polymer lithium batteries", which refer to lithium batteries with lithium nickel cobalt manganate or lithium nickel cobalt aluminate as the positive electrode material. Because ternary lithium batteries are small in size and have relatively high energy density, they are now widely used in new energy vehicles, such as Tesla cars. All car series use ternary lithium batteries.
1. Battery energy density
Ternary lithium > 18650 lithium ion battery 3.7v phosphate
Generally speaking, under the condition of volume or weight, lithium batteries can store more electricity and the mileage of the vehicle is greater. This is because of the difference in metal electrodes. The cathode material of 18650 lithium ion battery 3.7v phosphate rechargeable batteries is iron phosphate. Lithium, lithium batteries are nickel cobalt manganese or nickel cobalt aluminum. The chemical characteristics of different lithium batteries make the specific energy of lithium batteries of the same quality twice that of 18650 lithium ion battery 3.7v phosphate.
2. The safety factor of 18650 lithium ion battery 3.7v phosphate 18650 lithium ion battery 3.7v phosphate lithium ion batteries in popular cars is currently the best. When the working temperature reaches 600°C, it begins to melt. In comparison, lithium batteries begin to melt at about 300°C. .In the event of a fire, lithium batteries do account for a large proportion.
2. Safety performance
18650 lithium ion battery 3.7v phosphate>ternary lithium
Among current mainstream automotive batteries, 18650 lithium ion battery 3.7v phosphate has the best thermal stability. It begins to dissolve when the ambient temperature reaches 600°C. In contrast, ternary lithium batteries begin to dissolve at around 300°C. In spontaneous combustion incidents, it is true that ternary lithium battery models account for a larger proportion.
3. Low temperature performance
Ternary lithium > 18650 lithium ion battery 3.7v phosphate
The reduction of new energy vehicles in the cruise control range is a default setting in the industry. At low temperatures, lithium ammonium sulfate is smaller than lithium batteries. At -10, the lithium ammonium sulfate is reduced to about 50%, and the maximum number does not exceed -20 ℃. At the same temperature, the lower limit of lithium-ion batteries is -30c, and the attenuation coefficient is lower than that of 18650 lithium ion battery 3.7v phosphate.
4. Service life
18650 lithium ion battery 3.7v phosphate>ternary lithium
Car battery packs are the same as mobile phone batteries. When the chemical substances inside undergo multiple reactions, they lose activity and the total capacity decreases. 18650 lithium ion battery 3.7v phosphate can be charged 3,500 times before it decays to 80% of the limit for mandatory replacement. It is estimated that it can be used for more than 10 years. Ternary lithium has decayed to the limit value after being charged for about 2,000 times, and it can only be used for about 6 years.
Comprehensive evaluation: Ternary lithium batteries are suitable for passenger cars, 18650 lithium ion battery 3.7v phosphate batteries are suitable for buses, and the future will be dominated by solid-state batteries.
Both types of batteries have advantages. For example, 18650 lithium ion battery 3.7v phosphate batteries use lithium batteries, which have important safety properties and are better. Tesla uses ternary lithium batteries, which have significant battery life advantages. The shortcomings of battery life will cause consumers to subconsciously ignore other advantages. Since BYD began to use ternary lithium batteries, the century-old battle between the two batteries has also come to an end. However, in the Chinese automobile industry, the comprehensive type of ternary lithium batteries can significantly better meet the needs of the market.
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