Comparison of advantages and disadvantages of iron lithium battery and lithium polymer battery

Polymer lithium batteries generally refer to polymer lithium ion batteries. The new generation of polymer lithium-ion batteries can be thinned in shape (ATL batteries can be up to 0.5 mm thin, corresponding to the thickness of a card), arbitrary area, and arbitrary shape, greatly improving the battery design. Flexibility can meet product demand, making batteries of any shape and capacity provides device developers with some design flexibility and adaptability in power solutions to maximize their product performance. At the same time, the unit energy of polymer lithium-ion batteries has increased by 20 % compared to the current general lithium-ion batteries, and its capacity, environmental protection and other aspects are better than lithium-ion batteries, with some improvements.

Polymer lithium battery advantages and disadvantages

Advantages:

1. The operating voltage of a single battery is as high as 3.6 V ~ 3.8 V far higher than the 1.2 V voltage of nickel-metal hydride and nickel-cadmium batteries.

2. The capacity density is large, and its capacity density is 1.5 to 2.5 times that of nickel-metal hydride batteries or nickel-cadmium batteries, or higher.

3. Self-discharge is small, and its capacity loss is also small after being placed for a long time.

4. Long life, normal use of its cycle life can reach more than 500 times.

5. Without memory effect, the remaining power will not be emptied before charging, and it will be convenient to use.

6. Good safety performance

Polymer lithium batteries are structurally packaged with aluminum plastic, which is different from the metal shell of the liquid core. Once a safety hazard occurs, the liquid core is prone to explosion, and the polymer core is only a drum.

7. Thick, make it thinner

Very thin, batteries can be assembled into credit cards. Ordinary liquid lithium electricity adopts the method of customizing the shell first, and then canceling the positive and negative materials. There is a technical bottleneck below 3.6 mm in thickness, and the polymer core does not have this problem. The thickness can be below 1mm, which is in line with the current mobile phone demand. direction.

8. Light weight

Batteries using polymer electrolytes do not require metal shells for protective packaging. Polymer battery weight is 40 % lighter than steel shell lithium with the same capacity specification and 20 % lighter than aluminum shell battery.

9. Large capacity

Polymer batteries have a capacity of 10 to 15 % higher than steel shell batteries of the same size and 5 to 10 % higher than aluminum shell batteries. They have become the first choice for color screen mobile phones and MMS mobile phones. Nowadays, new color screens and MMS mobile phones are also on the market. Most use polymer cores.

10. Small internal resistance

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

11. Shapes can be customized

Manufacturers do not have to be limited to standard shapes and can economically make the right size. Polymer batteries can increase or reduce the core thickness according to customer demand, develop new core models, cheap, short opening cycle, and some can even be tailored to the shape of the phone to make full use of battery housing space and increase battery capacity.

12. Good discharge characteristics

Polymer batteries use colloidal electrolytes. Compared with liquid electrolytes, colloidal electrolytes have stable discharge characteristics and higher discharge platforms.

13. Simple design of protective panels

Due to the use of polymer materials, the core does not catch fire and does not explode. The core itself has sufficient safety. Therefore, the protection line design of the polymer battery can consider omitting the PTC and fuse, thereby saving battery costs.

Disadvantages:

1. Battery costs are high, and it is difficult to purify the electrolyte system.

2. The need to protect the line control, overcharge or overdischarge will cause the battery internal chemical substance reversibility is damaged, thus seriously affecting the battery life.

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