The difference between polymer batteries and lithium iron phosphate batteries

Introduction The difference between polymer batteries and lithium iron phosphate batteries. Their main difference lies in the difference between lithium-ion liquid electrolytes and lithium-ion polymer batteries.

The difference between polymer batteries and lithium iron phosphate batteries

The main difference between them is the electrolyte. Liquid lithium-ion batteries use liquid electrolytes, while lithium-ion polymer batteries use solid polymer electrolytes instead. This polymer can be in the “dry” state. It can also be. “colloidal”. Currently, most of them use polymer gel electrolytes.

Lithium Polymer Battery Overview Lithium polymer batteries generally refer to lithium-ion polymer batteries.

According to the different electrolytic materials used in lithium-ion batteries, lithium-ion batteries are divided into liquid lithium-ion batteries (LiquifiedLithium-IonBattery, called LIB) and polymer lithium-ion batteries (polymerLithium - IonBattery, called pLB) Or plastic lithium-ion battery (pLB for short).

Positive and negative electrode materials used in lithium-ion polymer batteriesre are the same as liquid lithium ions. Positive electrode materials are divided into lithium cobalt oxide, lithium manganate, ternary materials and lithium iron phosphate materials. and the negative electrode materials are graphite, and the working principles of the battery are basically the same.

Lithium polymer battery classification: Solid: The electrolyte of the solid polymer electrolyte lithium ion battery is a mixture of polymer and salt. This type of battery has high ionic conductivity at normal temperature and can be used at normal temperature. .

Gel: The gel polymer electrolyte lithium-ion battery adds a plasticizer and other additives to the solid polymer electrolyte to increase ionic conductivity and allow the battery to be used at room temperature.

Polymer: due to the use of solid electrolytes instead of liquid electrolytesof, compared with liquid lithium-ion batteries, polymer lithium-ion batteries have the advantage of being thinner, of any area and of any shape, so that they can The shell of the battery is made of aluminum-plastic composite film, which can improve the specific capacity of the entire battery; lithium-ion polymer batteries can also use polymers as cathode materials, and their specific mass energy will be more than 20% higher than the current one. liquid lithium-ion batteries. Lithium-ion polymer batteries (polymerLithium-IonBattery) have the characteristics of miniaturization, thinness and lightness. Therefore, polymer batteries will gradually increase their market share.

Principle of lithium polymer battery: Lithium ion batteries currently include liquid lithium ion batteries (LIB) and lithium ion polymer batteries (pLB). Among them, liquid lithium ion batteries refer to secondary batteries in which the built-in Li+ compounds are the positive and negative electrodes. The positive electrode uses lithium compounds LiCoO2, LiNiO2 or LiMn2O4, and the negative electrode uses a lithium-carbon interlayer compound LixC6.

(Images/Text/Photos: Pacific Automotive Network Q&A)

Electrolyte Formula

The main difference is the 'electrolyte, liquid lithium- Ion batteries use liquid electrolytes, while lithium-ion polymer batteries use solid polymer electrolytes instead. This polymer can be “dry” or “colloidal”. Currently, most polymers are used with a gel electrolyte.

Overview of lithium polymer batteriesAccording to the different electrolytic materials used in lithium ion batteries, lithium ion batteries are dividedproduced in liquid lithium-ion batteries and polymer lithium-ion batteries or plastic lithium-ion batteries. The positive and negative electrode materials used in polymer lithium ion batteries are the same as liquid lithium ions. Positive electrode materials are divided into lithium cobalt oxide, lithium manganate, ternary materials and lithium iron phosphate materials. The principle of operation of the battery is also basic.

Classification Solid Polymer Electrolyte Lithium-ion battery electrolyte is a mixture of polymer and salt. This type of battery has high ionic conductivity at room temperature and can be used at room temperature.

Gel-gel polymer electrolyte lithium-ion batteries add additives such as plasticizers to the solid polymer electrolyte to increase ionic conductivity and allow the battery to be used at room temperature.

Being a giftborn that the polymer replaces the liquid electrolyte with a solid electrolyte, compared to the liquid lithium-ion battery, the polymer lithium-ion battery has the advantage of being thinner, of any area and of no matter what shape, it can therefore be used in aluminum-plastic. composite films are used to make battery cases, which can improve the specific capacity of the entire battery; polymer lithium-ion batteries can also use polymers as cathode materials, and their specific mass energy will be more than 20% higher than that of current liquid lithium. ionic batteries. Lithium-ion polymer batteries have the characteristics of miniaturization, thinness and lightness. Therefore, polymer batteries will gradually increase their market share.

(Images/texts/photos: Q&A) Wenjie M5 Xpeng Motors P7 AION V Trumpchi GS8 Xpeng P5 Ideal ONE @2019

1. THEcapacitors, etc. (which are corrosive to some extent) provide ions for their normal functioning. And make sure the chemical reactions that occur during work are reversible.

2. Electrolyte composition:

(1) Ethylene carbonate Molecular formula: C3H4O3. Transparent colorless liquid (>35℃), crystalline solid at room temperature. Boiling point: 248℃/760mmHg, 243-244℃/740mmHg; Flash point: 160℃; Density: 1.3218; Refractive index: 1.4158 (50℃); solvent. It can be used as a spinning fluid in textiles; it can also be used directly as a solvent to remove acid gases and as an additive for concrete; it can also be used as a component and raw material for pharmaceutical products; plastic foaming agent and synthetic lubricant; In the battery industry, it can be used as an excellent solvent for electrolyte of lithium batteries.

(2) Propylene carbonate Molecular formula: C4H6O3. Colorless and odorless, or light yellow, transparent liquid, soluble in water and carbon tetrachloride, miscible with ether, acetone, benzene, etc. It is an excellent polar solvent. This product is mainly used for operations of polymer, gas volume separation process and electrochemistry. It is especially used to absorb carbon dioxide from natural gas raw materials and synthetic ammonia in petrochemical plants. It can also be used as plasticizer, spinning solvent, olefin and aromatic hydrocarbon extractant, etc.

(3) Diethyl carbonate. Colorless liquid with a slight odor; vapor pressure 1.33kPa/23.8℃; flash point 25℃; boiling point 125.8℃; solubility: insoluble in water, miscible in most alcohols, ketones, esters, etc. solvant; density: relative density (water = 1) 1.0; relative density (air = 1) 4.07; stability: hazard level 7 (flammable liquid: used as a solvent and used in organic synthesis);

3. Electrolyte preparation method: Electrolyte is prepared from special sulfuric acid and distilled water in a certain proportion. The density is typically 1.24 to 1.30 grams per cubic centimeter. Specific gravity 12.75-12.85 G/CM3 of sulfuric acid and pure water. If water is consumed during battery use, simply add pure water to charge. For example, the electrolyte of lead-acid batteries is prepared from 80% sulfuric acid and distilled water in a certain proportion, and its density is generally 1.24-1.30 g/cm3. The density is 12.75 to 12.85 g/cm3. The electrolyte of some lead-acid batteries (such as motorcycle lead-acid batteries) needs to be recharged by yourself. Therefore,be very careful when filling. eyes or mouth! If the battery consumes water during use, simply add pure water to charge it.

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