Which lithium battery and lead battery are better?

Is it better to use lead batteries for electric vehicles or lithium batteries? Of course, lithium batteries are good! Lithium batteries are better. Lithium batteries are more than three times higher than lead-acid batteries, regardless of their volumetric energy or weight-to-weight energy. Lithium batteries are smaller and lighter long cycle life. The cycle life of lithium batteries used in electric vehicles is generally more than 800 times. The lithium batteries using lithium iron phosphate cathode materials can reach 2000 times, which is 1.5 to 5 times higher than lead-acid batteries. This greatly reduces the cost of using the lithium battery, prolongs the service life and improves the ease of use. Second, lithium battery and lead-acid battery comparison 1, battery capacity lithium battery capacity is generally 8-10 amps, lead-acid battery capacity is about 20 amps. 2, driving kilometers

A lithium polymer battery refers to a lithium ion battery that is all solid or gel is too electrolyte. Generally, an aluminum-plastic composite film is used as a packaging material. There are currently only two real lithium polymer batteries in the world. One is Japan's SONY, and the other is China's ATL.

A lithium battery generally refers to an aluminum shell battery, the electrolyte is in a liquid state, and the outer packaging material is an aluminum shell,

Lithium polymer batteries are safer than lithium batteries. Lithium polymer batteries are upgraded products of lithium ion batteries. Compared with the current popular lithium-ion battery, it has the advantages of large capacity, small size (thin), and safety (no explosion). However, due to the time required for the replacement of the entire industry chain, its cost (cost) is still relatively high, and it is only used in high-end digital products (ultra-thin notebook computers, etc.).

It is foreseeable that in the next 5-10 years, lithium polymer batteries will replace the existing lithium-ion batteries! In fact, the popularity of lithium polymer batteries in countries such as Japan and South Korea, which are more developed in the electronics industry, has reached a certain level, but China is still relatively backward in this respect. Let us wait and see! In the near future, mobile phones with lithium polymer batteries will be cheaper. I must replace this more secure mobile phone (battery)!

Lithium polymer battery (Li-polymer, also known as polymer lithium battery): It has a variety of obvious advantages such as high energy density, smaller size, ultra-thinness, light weight, high safety and low cost battery. In terms of shape, the lithium polymer battery has an ultra-thinning feature and can be fabricated into a battery of any shape and capacity in accordance with the needs of various products. The battery can reach a minimum thickness of 0.5mm. Compared to lithium-ion batteries, lithium polymer batteries have the following characteristics:

1. No battery leakage problem, the battery does not contain liquid electrolyte inside, using colloidal solids.

2. Can be made into a thin battery: with a capacity of 3.6V400mAh, its thickness can be as thin as 0.5mm.

3. The battery can be designed in a variety of shapes.

4. The battery can be bent and deformed: the polymer battery can be bent up to about 90°.

5. A single high-voltage: liquid electrolyte battery can only be connected in series with several batteries to obtain a high voltage, and the polymer battery can be made into a multi-layer combination in a single piece to achieve a high voltage because it has no liquid.

6. The capacity will be twice as high as the same size lithium-ion battery.

Both lithium-ion batteries and lithium-polymer batteries have their own advantages and disadvantages.

Advantages and disadvantages of polymer lithium batteries and lithium ion batteries.

First, the advantages:

1. Good safety performance

The polymer lithium battery is made of aluminum-plastic flexible packaging, which is different from the metal casing of the liquid battery. Once the safety hazard occurs, the liquid battery is easy to explode, and the polymer battery can only be air-blasted at most.

2. Small thickness, can be made thinner

Ultra-thin, the battery can be assembled into a credit card. Ordinary liquid lithium battery adopts the method of customizing the outer casing first, and then plugging the positive and negative materials. The thickness is 3.6mm or less, there is a technical bottleneck. The polymer battery core does not have this problem, and the thickness can be less than 1mm, which meets the needs of current mobile phones direction.

3. Light weight

A battery using a polymer electrolyte does not require a metal shell as a protective outer package. The weight of the polymer battery is 40% lighter than the steel shell lithium battery of the same capacity specification, which is 20% lighter than the aluminum shell battery.

4. Large capacity

The polymer battery has a capacity of 10-15% higher than that of the same size steel shell battery, which is 5-10% higher than that of the aluminum shell battery. It is the first choice for color screen mobile phones and MMS mobile phones. Nowadays, the new color screen and MMS mobile phones on the market are mostly used polymer batteries.

5. Small internal resistance

The internal resistance of the polymer battery core is smaller than that of the general liquid battery. At present, the internal resistance of the domestic polymer battery core can even be less than 35mΩ, which greatly reduces the self-consumption of the battery and prolongs the standby time of the mobile phone, the level of integration with the international. This polymer lithium battery that supports large discharge currents is an ideal choice for remote control models and is the most promising alternative to nickel-metal hydride batteries.

6. Shape can be customized

Manufacturers are not limited to standard shapes and can be economically made to the right size. Polymer batteries can increase or decrease the thickness of batteries according to customers' needs. Develop new battery models, which are cheap, open cycle is short, and some can even be customized according to the shape of mobile phones to make full use of battery casing space and upgrade batteries capacity.

7. Good discharge characteristics

The polymer battery uses a colloidal electrolyte, which has a smooth discharge characteristic and a higher discharge platform than a liquid electrolyte.

8. The protection board is simple in design

Due to the use of polymer materials, the battery core does not ignite or explode, and the battery core itself has sufficient safety. Therefore, the protective circuit design of the polymer battery can be omitted by omitting the PTC and the fuse, thereby saving battery cost.

Second, the disadvantages:

1. Energy density and cycle times are reduced compared to lithium ion batteries.

2. Manufacturing is expensive.

3. There is no standard shape, and most batteries are manufactured for the high-capacity consumer market.

4. Compared with lithium-ion battery, the price and energy are relatively high.

Lithium-ion batteries are classified into liquid lithium-ion batteries (Liquified Lithium-Ion Battery, LIB for short) and polymer lithium-ion batteries (Polymer Lithium-Ion Battery, PLB for short) or plastic lithium-ion batteries (Plastic Lithium IonBatteries). , referred to as PLB). The positive and negative materials used in the polymer lithium ion battery are the same as the liquid lithium ions. The positive electrode material is divided into lithium cobaltate, lithium manganate, ternary material and lithium iron phosphate material, and the negative electrode is graphite. The working principle of the battery is also basically Consistent. The main difference is that the electrolyte is different. The liquid lithium ion battery uses a liquid electrolyte, and the polymer lithium ion battery is replaced by a solid polymer electrolyte. The polymer can be either "dry" or "colloidal". Most of the current polymer gel electrolytes are used.

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