What kind of batteries are generally used for electric car batteries, lead-acid batteries are good or lithium batteries are good

Real lithium ion mainly rely on lithium ions move between the positive and negative electrodes to work.

In the process of charging and discharging, Li + back and forth between the two electrodes embedded and de-embedded: charging battery, Li + de-embedded from the positive electrode, through the electrolyte embedded in the negative electrode, the negative electrode is in the state of lithium-rich; discharge is the opposite. Generally use lithium-containing materials as the electrode of the battery, at this stage, the most negative electrode are used graphite. Compared with lead-acid batteries, lithium batteries have the advantages of light weight, large specific capacity, long cycle life, etc. As an electric scooter power supply for the elderly, it is not only light and portable, but also convenient for charging, and helps to "lighten and simplify" the design of the whole vehicle.

The electrodes of lead-acid batteries are mainly made of lead and its oxides, and the electrolyte is sulfuric acid solution. In the charging state of lead-acid batteries, the main component of the positive electrode is lead dioxide, and the main component of the negative electrode is lead; in the discharging state, the main component of the positive and negative electrodes are both lead sulfate.

1, safety comparison: power lithium batteries (lithium manganate, lithium iron phosphate) materials differ in security, lead-acid battery technology is quite mature, security than lithium batteries.

2, environmental comparison: lithium batteries are not polluted (most, but there are worse manufacturers), while lead-acid batteries have heavy metal lead pollution. So electric cars using lead-acid batteries will still pollute the environment.

3, price comparison: the market price of lithium batteries of the same capacity is more than double the price of lead-acid batteries. This is the reason why electric cars using lithium batteries are more expensive.

4, energy comparison: lithium batteries are higher than lead-acid batteries mass ratio, volume ratio, energy ratio of about 40%.

5, self-discharge rate comparison: lithium batteries monthly self-discharge less than 3%, while the lead-acid batteries 15-30%, the difference is large.

6, service life comparison: the current general-purpose lithium iron phosphate charging 1500 times, there is no memory effect, charging 1500 times after about 85% of the storage capacity, and lead-acid batteries for about 500 times, the storage capacity will also be a significant drop, and the memory effect is very obvious. So the use of lithium battery electric vehicle battery life will be longer.

7, voltage platform comparison: lithium battery voltage platform are greater than 3V, lead-acid batteries are 2V.

8, discharge characteristics comparison: simply put the same capacity of the battery, high-current discharge, lithium batteries than the lead-acid batteries to put out more than about 30% of the electricity.