What's the difference between a lithium battery and a lithium iron phosphate battery?

Different voltages, the nominal voltage of lithium iron phosphate battery 3.2 V, polymer lithium battery 3.7 V;

Different capacity, the same volume polymer lithium battery capacity is much larger; For example, the 18650 polymer lithium battery is 2200mAh, while the lithium iron phosphate battery has a capacity of 110mAh;

The lithium iron phosphate battery can discharge to 0V voltage and can be restored, although the over-discharge protection voltage is generally 2V; The polymer lithium battery over discharge protection voltage 2.7 V, low will be broken;

Different discharge currents, the power polymer lithium battery has a maximum discharge current of 5 times, and the lithium iron phosphate battery can discharge current of 10 times; Charging is the same, so lithium iron phosphate batteries can be filled faster;

Overview of Polymer lithium batteries

Polymer lithium batteries generally refer to polymer lithium ion batteries.

According to the different electrolyte materials used in lithium-ion batteries, lithium-ion batteries are divided into liquid lithium-lithium-Ion Battery(abbreviated as LIB) and polymer lithium-ion batteries(abbreviated as PLB) or plastic lithium-ion batteries(Polymer Lithium -Ion Batteries, abbreviated as PLB). The positive and negative materials used in polymer lithium-ion batteries are the same as liquid lithium-ions. Positive materials are divided into lithium cobalt acid, lithium manganese acid, ternary materials, and lithium iron phosphate materials. Negative graphite, and the principle of battery operation is basically the same. Their main difference lies in the difference in electrolytes. Liquid lithium-ion batteries use liquid electrolytes. Polymer lithium-ion batteries are replaced by solid polymer electrolytes. This polymer can be "dry" or "colloidal"., At present, most polymer gel electrolytes are used.

Polymer lithium battery classification:

Solid:

Solid polymer electrolyte lithium ion battery electrolyte is a mixture of polymer and salt. This battery has high Ionic conductivity at room temperature and can be used at room temperature.

Gel:

Gel polymer electrolyte lithium-ion batteries are additives such as plasticizers added to solid polymer electrolytes to increase Ionic conductivity and enable batteries to be used at room temperature.

Polymer:

Since solid electrolytes are used instead of liquid electrolytes, polymer lithium-ion batteries have the advantages of thinning, arbitrary area, and arbitrary shape compared to liquid lithium-ion batteries. Therefore, aluminum plastic composite films can be used to make battery shells. This can improve the specific capacity of the entire battery; Polymer lithium-ion batteries can also use polymer as a positive material, and their quality will be more than 20 % higher than that of current liquid lithium-ion batteries. Polymer Lithium-Ion Battery batteries are miniaturized, thin, and lightweight. Therefore, polymer batteries will gradually increase in market possession.

What are the differences and differences between polymer lithium batteries and lithium iron phosphate batteries?

Polymer lithium battery principle:

Lithium-ion batteries currently have liquid lithium-ion batteries(LIB) and polymer lithium-ion batteries(PLB). Among them, liquid lithium-ion batteries refer to secondary batteries where Li + embedded compounds are positive and negative. The positive electrode uses the lithium compound LiCoO2, LiNiO2 or LiMn2O4, and the negative electrode uses the lithium-carbon interlayer compound LixC6. The typical battery system is:

What are the differences and differences between polymer lithium batteries and lithium iron phosphate batteries?

Polymer lithium-ion batteries have the same principle as liquid lithium, the main difference being that electrolytes are different from liquid lithium. The main structure of the battery includes three elements: positive, negative, and electrolyte. The so-called polymer lithium-ion battery means that at least one or more of these three major structures use polymer materials as the main battery system. In the polymer lithium-ion battery system currently developed, polymer materials are mainly applied to positive poles and electrolytes. Positive materials include conductive polymer polymers or inorganic compounds used in general lithium-ion batteries. Electrolytes can use solid or colloidal polymer electrolytes, or organic electrolytes. Lithium-ion technologies generally use liquids or colloidal electrolytes. Therefore, strong secondary packaging is required to accommodate flammable active ingredients, which increases weight and also limits size flexibility.

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 over-discharge will cause the battery internal chemical substance reversibility is damaged, thus seriously affecting the battery life.

What are the differences and differences between polymer lithium batteries and lithium iron phosphate batteries?

Overview of lithium iron phosphate batteries

lithium iron phosphate batteries refer to lithium ion batteries that use lithium iron phosphate as a positive material. The positive materials of lithium ion batteries are mainly lithium cobalt acid, lithium manganese acid, lithium nickel acid, ternary materials, and lithium iron phosphate. Among them, lithium cobalt acid is currently a positive material used in most lithium ion batteries.

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