Why is widely use lithium battery electric car?

Source: 2020 - 03 - 28 and the hits: time why lithium ion batteries are often used for pure electric cars? What is the advantage of lithium battery? The difference between the new energy vehicles and fuel cars is that the use of new energy vehicles must participate in electric power, the source of the power depends on the battery. In the market, there are two kinds of new energy car battery, one is a lead-acid batteries, the other is a lithium battery. The most commonly used two kinds of battery is lithium ion battery, so why not use lead-acid batteries? Battery energy density, energy density of batteries, lead-acid battery energy density is about 50 - 70 wh/g, and the energy density of lithium-ion batteries is about 200 - 260 wh/g, that is to say, in the same weight of two batteries, lead-acid battery discharge power and endurance capacity is not as high as lithium batteries. In addition, the new energy markets continue to have is the need of a legitimate, if continue to use lead-acid batteries, new energy vehicles should be development. Battery life: one of the most popular lithium battery is three yuan of lithium iron batteries and lithium battery. For lithium iron batteries, the cycles of up to 2000 times, the ternary lithium battery is slightly lower than that of lithium iron batteries, but its cycles can reach more than 1000 times, and lead-acid battery cycle number more than 1000 times, only 300 - 350 times or so. Lithium battery, by contrast, is about 3 - the lead-acid battery service life 6 times. Learn about new energy vehicles owners know that the cost of the battery can be started from scratch to replace with a new electric car. If all of the new energy vehicles use lead-acid batteries, so on average less than 2 - Three years is need to replace the battery, then who can bear? Battery safety: the importance of the safety of new energy vehicles is also a lot of car owners, because recently for a period of time of new energy car spontaneous combustion has been exposed, scary, new energy vehicles there are many reasons for the spontaneous combustion, there are frequent battery charging and discharging caused by spontaneous combustion. Lead-acid battery is not used by gradually reason is that if the charging time is too long, will produce large amounts of hydrogen and oxygen. If there is no timely release of gas, it will be in front of the fire explosion. Lithium ion batteries is safer. To sum up, lead-acid battery is not used, because it is not suitable for the present stage of development, all aspects of the functions are not as good as a lithium-ion battery, the only advantage is cheaper, more durable. But new energy vehicles need to have the development potential of the battery, so the lithium battery to gradually replace lead-acid batteries.