BT-12M7.0AT Saite battery

Fumed silica colloidal battery gel is fumed silica. Fumed silica is a kind of high purity white odorless nano powder material with thickening, anti-caking, control system rheology and thixotropy. In addition to traditional applications, it has been widely used in colloidal batteries in recent years.
Fumed silica is a nanometer-sized white powder produced by hydrothermal hydrolysis of silicon halides in an oxyhydrogen flame, commonly known as fumed silica, which is an amorphous silica product with a primary particle size of 7 to 40 nm. The aggregates have a particle size of about 200-500 nm, a specific surface area of ​​100-400 m2/g, a high purity, and a SiO2 content of not less than 99.8%. Surface-untreated fumed silica aggregates contain a variety of silanol groups, one is an isolated, undisturbed, free hydroxyl group, and the other is a bonded silicon hydride that is connected and forms hydrogen bonds with each other. Surface-untreated fumed silica aggregates are aggregates containing a plurality of -OH groups, which readily form a uniform three-dimensional network structure (hydrogen bonds) in a liquid system. When the three-dimensional network structure (hydrogen bond) has external forces (shear force, electric field force, etc.), it will be destroyed, the medium will become thinner and the viscosity will drop. Once the external force disappears, the three-dimensional structure (hydrogen bond) will recover on its own and the viscosity will increase, ie This thixotropy is reversible.
Fumed silica is mainly used in colloidal batteries for its excellent thickening and thixotropic properties. Colloidal electrolytes are composed of fumed silica and a certain concentration of sulfuric acid solution in a certain proportion. The sulfuric acid and water in this electrolyte are used. It is "stored" in the silica gel network and is in the form of a "soft solid-state gel" that appears solid when stationary. When the battery is charged, due to the increase of the concentration of sulfuric acid in the electrolyte, it is “thickened” and accompanied by cracks. The “electrolyzed water” reaction during the late charging stage causes the oxygen generated by the positive electrode to be absorbed by the negative electrode through these numerous cracks, and further Reducing to water, so as to achieve the battery seal cycle reaction. The concentration of sulfuric acid in the electrolyte is reduced during the discharge to make it "thinning," and becomes a thinned state before the battery is filled. Therefore, colloidal batteries have a "maintenance-free" effect. The basic use of fumed silica at home and abroad is Degussa's AEROSIL 200.
Colloid battery excellent characteristics
1, can significantly extend the battery life. According to the relevant literature, the battery life can be extended by 2-3 times.
2. The self-discharge performance of the colloidal lead-acid battery is significantly improved. Under the same conditions of sulfuric acid purity and water quality, the battery storage time can be extended by more than two times.
3, colloidal lead-acid batteries in the case of serious power shortage, anti-vulcanization performance is very obvious.
4. Colloidal lead-acid batteries have a strong recovery capability under severe discharge conditions.
5. The colloidal lead-acid battery has strong anti-overcharging capability. Through several lead-acid batteries (a colloidal lead-acid battery, a valve-regulated sealed lead-acid battery), the overcharge test is repeated several times. The capacity of the colloidal lead-acid battery The drop is slower, and the valve-regulated lead-acid battery has a significant drop in capacity because of its high water consumption.
6. The post-discharge performance of colloidal lead-acid batteries has been significantly improved.

How the battery works

Whether it is a valve-regulated sealed lead battery using a glass fiber membrane (hereinafter referred to as AGM sealed lead-acid battery) or a valve-regulated sealed lead battery using colloidal electrolyte (hereinafter referred to as a colloidal sealed lead-acid battery), they are all based on the principle of cathode absorption. The battery is sealed.
When the battery is charged, the positive electrode releases oxygen, and the negative electrode releases hydrogen. Positive oxygen evolution begins when the positive charge reaches 70%.
The precipitated oxygen reaches the negative electrode and reacts with the negative electrode to achieve the purpose of cathode absorption.
2Pb ten O2=2PbO
2PbO 10 2H2SO4: 2PbS04 + 2H20
The hydrogen evolution of the negative electrode starts when it is charged to 90%, plus the reduction of oxygen on the negative electrode and the increase of the hydrogen overpotential of the negative electrode itself, thereby avoiding a large amount of hydrogen evolution reaction.
For AGM sealed lead-acid batteries, the majority of the battery's electrolyte is retained in the AGM diaphragm, but 10% of the diaphragm must be drained from the electrolyte. Oxygen generated by the positive electrode is absorbed by the negative electrode through this part of the pore to reach the negative electrode.
The main component of the colloidal electrolyte is a functional compound with a particle size close to that of the nanometer scale. The rheology is good, and it is easy to perform the liquid filling for the lead storage battery. After the gel electrolyte enters the interior of the battery or is charged for several hours, gelation will occur gradually, turning the liquid electrolyte into a jelly, and a variety of surfactants will be added to the colloid to help resist gelation before filling the battery. It helps to prevent the sulfation of the plate after filling the battery, reduces the corrosion of the grid, and improves the reaction utilization of the active material of the plate.
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