Ultra-pure grade DMC—a key material for 5G mobile phone battery to improve battery life and service life

The 5G era has put forward higher requirements for the electrolyte, which is one of the four major materials of mobile phone batteries. The electrolyte is called the "blood of the lithium battery. The main function of the electrolyte is to conduct electrons between the positive and negative electrodes of the lithium battery. The electrolyte has an important impact on the safety, cycle life, high and low temperature performance of the lithium battery. .

Generally, the electrolyte is composed of a solvent, a solute, and an additive. The general mass ratio of the solvent, solute, and additive is 0.80: 0.15: 0.05.

Dimethyl carbonate DMC is the most widely used electrolyte solvent. The purity of ultra-pure grade DMC is higher than that of battery grade DMC. It has a certain effect on the improvement of the energy density of 5G mobile phone batteries and the extension of service life.

Molecular formula of DMC—CH3O-COOCH3

Compared with 4G mobile phones, 5G mobile phones have many advantages such as fast network speed and high spectrum utilization. However, 5G mobile phones need to handle more tasks, require more bandwidth, and the number of antennas used increases significantly. These factors will lead to 5G mobile phones. The increased power consumption of 5G makes the battery life of 5G mobile phones relatively short.

Energy density represents the amount of energy stored in a battery per unit mass, and energy density determines the battery life of a cell phone. The ultra-pure grade DMC helps to increase the energy density of the mobile phone battery, so that the mobile phone battery can store more power, and thus extend the battery life of the mobile phone.

In addition, the short battery life means that 5G mobile phones need to be charged frequently, which will affect the service life of mobile phone batteries. Ultra-pure grade DMC helps extend the life of mobile phone batteries.

Because the electrolyte solvent with less impurity content can reduce the negative reaction of the mobile phone battery in the process of charging and discharging, and thus increase the number of times the battery can be charged, and achieve the extension of the battery life. In addition, ultra-pure DMC also has a certain improvement effect on the fast charging function of mobile phone batteries. According to Baichuan Information, the current ultra-pure DMC leading producer Shi Dasheng Hua ultra-pure grade DMC's offer is 10700 yuan / ton, up 15.55% from October 14.

The voltage of the 4G mobile phone battery is generally 4.4V, and the voltage of the 5G mobile phone battery must reach 4.5V-4.6V. Increasing the battery voltage is one of the important ways to improve the battery life of the 5G mobile phone.

Because energy density = battery capacity × voltage / battery weight. It can be seen that increasing the battery voltage can increase the energy density of the battery.

However, in the case of high voltage, the electrolyte is easily oxidized and decomposed. Once the electrolyte is oxidized and decomposed, the positive and negative electrodes of the battery will be destroyed, especially the decomposition of the electrolyte on the positive electrode is likely to increase. To solve this problem, additives are the key. Boron-containing additives are suitable for use in high-voltage batteries.

The additive containing boron will be oxidized preferentially over the solvent during the cycle of the lithium battery, thereby forming a protective film covering the surface of the positive electrode. The protective film has good ionic conductivity, which can inhibit the oxidative decomposition and lithium of the electrolyte in the subsequent battery cycle The destruction of the battery positive electrode material structure, thereby stabilizing the interface between the electrolyte and the electrode, thereby enhancing the stability of the positive electrode interface. Shi Dashenghua issued an announcement on August 20 that the company will invest in a 5,000-ton / year electrolyte additive project that includes boron-containing additive products.

Ultra-pure grade DMC and boron-containing additives can improve the performance of 5G mobile phone batteries, thereby improving the consumer experience. With the continuous growth of 5G mobile phone sales, ultra-pure grade DMC and boron-containing additives will get more applications.

Guide Shoe

The elevator guide shoe

Elevator guide shoe is a sliding part between elevator guide rail and car, what we call it guide shoe. It can fix the car on the guide rail and make car running up and down. Oil cup upper the elevator guide shoe that can reduce the friction of the shoe line and guide rail. There are four sets of guide shoes installed in each unit, respectively on both sides of the upper beam and under the safety clamp seat at the bottom of the car; and also four sets counter weight guide shoes are mounted on the bottom and top of the beam.

The guide shoes fixed on the car can move up and down along the fixed guide rail installed on the wall of the well way of the building to prevent the car from deviating or swinging in operation.

Guide shoe installation requirements

The installation method of guide shoe is to put it on the installation position of the guide rail of the car frame. After finding the right position, use the bolt fix it on the car guide rail frame. The installation must meet the following requirements:

1. When the upper and lower guide shoes are installed in the right position, they should be on the same vertical line. No slant or deflection is allowed. Both roller guide shoes and fixed guide shoes same requirement.
2. Fixed guide shoes are mainly used for FOVF units, the clearance between the two sides should be consistent, and the clearance between the inner lining and the rail top should be within O. 5 ~ 2 mm
3. 
   

Guide shoe,elevator Guide shoe,lift Guide shoe,casting Guide shoe liner

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