Which one is better, colloidal battery or lead acid battery?

The two "driver" batteries are energy storage batteries, solar lead acid batteries and colloidal batteries, which use the principle of cathode absorption to seal the battery. When the battery is being charged, oxygen is evolved in the positive electrode and hydrogen is evolved in the negative electrode. The positive oxygen evolution begins when the positive charge reaches 70%. The precipitated oxygen reaches the negative electrode, and the following reaction with the negative electrode achieves the purpose of cathode absorption. The hydrogen evolution of the negative electrode starts at the time of charging to 90%, and the reduction of oxygen on the negative electrode and the increase of the hydrogen over potential of the negative electrode itself prevent a large amount of hydrogen evolution reaction. The biggest difference between the two is the electrolyte curing.

For lead acid battery and AGM diaphragm while keep the battery in the bulk of the electrolyte, but must make 10% don't enter the electrolyte membrane pore. The anode generated through this part of the pore to the cathode oxygen is absorbed by the cathode.

For a colloidal battery, the silicone gel in the battery is a three-dimensional porous network structure composed of SiO dots as a skeleton, and the electrolyte is contained therein. After the battery-infused silica sol turns into a gel, the skeleton is further shrunk, so that cracks appear in the gel between the positive and negative plates, and the oxygen which is precipitated from the positive electrode provides a passage to the negative electrode.

From that, the sealing principle of two kinds of battery is the same, the difference lies in the way of "fixed" of electrolyte and supply oxygen to get to the cathode channel is different.

Moreover, two kinds of battery also has a lot of differences in structure and process, the "driving force" lead-acid battery using pure aqueous solution of sulfuric acid as electrolyte, colloid sealed lead battery electrolyte consists of silica sol and match of sulfuric acid, the concentration of a solution of sulfuric acid is lower than lead-acid batteries.

In the end, the discharge of the battery capacity is also different. Gel electrolyte formula, control the size of colloidal particles, adding hydrophilic polymer additives, lower adhesive solution concentration higher permeability and affinity of plate, the filling vacuum technology, compound clapboard or AGM partition to replace rubber plate, improve the battery fluid absorption; Cancel cell sedimentation tank, moderately increasing the plate area is the content of active material, the result can make the sealing colloid battery discharge capacity at or near the level of open type lead-acid batteries.

AGM sealed lead-acid battery electrolyte quantity is little, the thickness of the plate thicker, below the open type cell, the utilization of active material and discharge capacity of the battery is about 10% less than open type cell. Compared with today's colloid sealed battery, its discharge capacity is smaller. That is the price of gel battery will be relatively higher.

Colloid lead-acid storage battery is the improvement of ordinary lead-acid battery liquid electrolyte, by substituting colloid electrolyte sulphuric acid electrolyte, in safety, storage capacity, discharge performance and service life than ordinary batteries have improved.

Colloid lead-acid storage battery using gel electrolyte, inside there is no free fluid, electrolyte under the same volume large capacity, heat capacity, heat dissipation ability strong, can avoid battery are prone to thermal runaway phenomenon; The electrolyte concentration is low, weak corrosion effect of plate; Concentration is uniform, there is no electrolyte stratification.

Colloid lead-acid battery performance is better than that of valve-control sealed lead-acid battery, colloid lead-acid battery has the use of stable performance, high reliability, long service life, temperature adaptability to the environment (high and low temperature), take a long time discharge capacity, cycle discharge capacity, depth of discharge and large current discharge ability is strong, have to over charge and discharge protection, etc.

The domestic colloid lead-acid battery for electric bicycle is by vacuum infusion in the lining of the AGM, the silica gel and sulphuric acid solution between irrigation to the battery positive and negative plate. Colloid lead-acid battery to oxygen cycle at the beginning of use, this is because the colloid has surrounded the positive and negative plate, positive plate of oxygen diffusion to the negative plate to the above, cannot be achieved with the active material of lead on the negative plate reduction, can only through the exhaust valve, consistent with rich liquid type battery.

Colloid lead-acid batteries used for a period of time after colloid began to dry and shrinkage, cracks, oxygen cycle through the cracks directly to the negative plate. Exhaust valve no longer often open, colloid lead-acid battery is close to sealing work, little water loss. So for electric bicycle battery is main failure mechanism of water loss, the colloid lead-acid battery can obtain very good results. Gel electrolyte is through add gels to sulfuric acid in the electrolyte solidified into colloidal substances, usually in the colloidal electrolyte with colloid stabilizer and compatibilizers, some gel formula with delay colloid solidification and retardant, so that the colloid filling.

The gas phase silica

Colloidal battery gels for gas phase silicon dioxide, the gas phase method of silica is a kind of high purity white odorless nano material, with a thickening, anti caking, rheology and thixotropy control system, and so on, in addition to the traditional application, in recent years has been widely used in the colloid storage battery.

Gas phase method of silica is silicon halide in the oxyhydrogen flame high temperature hydrolysis of nanoscale white powder, commonly known as fumed silica, it is a kind of amorphous silica products, primary particle size between 7 ~ 40 nm, aggregate particle size is about 200-500 nm, specific surface area of 100 ~ 400 m2 / g, high purity, SiO2 content of not less than 99.8%.Did not deal with the surface of the gas phase silica aggregate is contain a variety of hydroxyl groups, one is isolated, not interference free hydroxyl groups;2 it is even born, each other to form hydrogen bond bonded silicon hydroxyl. Did not deal with the surface of fumed silica aggregation is an aggregate of containing multiple - OH, they are easily in the fluid system form a uniform three-dimensional mesh structure (hydrogen bonding).This kind of 3 d mesh structure (hydrogen bonding) has the external force, shear force, electric field force, etc.) It will be damaged, medium is thinning, viscosity decreased, the external force, the three dimensional structure (hydrogen bonding) will heal itself, viscosity rise, namely the thixotropy is reversible.

Fumed silica is mainly used in colloidal storage batteries for its excellent thickening thixotropic properties. The colloidal electrolyte is composed of fumed silica and a certain concentration of sulfuric acid solution in a certain proportion. The sulfuric acid and water in the electrolyte It is "stored" in a silicone gel network and is a "soft solid gel" that appears solid when stationary. When the battery is charged, the "electrolyzed water" reaction in the later stage of charging causes the oxygen generated by the positive electrode to be absorbed by the negative electrode through the numerous cracks, and further It is reduced to water to achieve a battery seal cycle reaction. The concentration of sulfuric acid in the electrolyte at the time of discharge makes it "thinning" and becomes a thin state of the gel before the battery is poured. Therefore, the gel battery has a "maintenance-free" effect. The basic use of fumed silica at home and abroad is Degussa AEROSIL200.

Colloidal battery excellent properties

1, it can significantly extend the life of the battery. According to the relevant literature, the battery life can be extended by 2-3 times.

2, colloid lead-acid battery self-discharge performance is improved significantly, at the same purity and water quality situation of sulfuric acid battery storage time can extend more than 2 times.

3, colloid lead-acid battery in the case of severe power shortage, vulcanization resistance is very obvious.

4. Colloidal lead-acid batteries have strong recovery ability under severe discharge conditions.

5, colloid lead-acid battery resistance to overcharge ability strong, through the two lead-acid battery (a colloid lead-acid battery, a valve-control sealed lead-acid battery) also repeated several times of charging test, colloid lead-acid battery capacity decline more slowly, and valve-control sealed lead-acid battery because water too fast, its capacity decreased significantly.

6, colloid late lead-acid battery discharge performance is obviously improved.

Whether it is a valve-regulated sealed lead storage battery using a glass fiber diaphragm (hereinafter referred to as AGM sealed lead storage battery) or a valve-regulated sealed lead storage battery using a colloidal electrolyte (hereinafter referred to as a colloid-sealed lead storage battery), they all utilize the principle of cathode absorption. The battery is sealed.

When the battery is being charged, oxygen is evolved in the positive electrode and hydrogen is evolved in the negative electrode. The positive oxygen evolution begins when the positive charge reaches 70%.

Precipitation of oxygen to the cathode and negative to the following reaction, achieve the goal of cathode absorption.

Pb O2 = 10 2 pbo

Pbo 2 - h2so4 10:2 pbs04 + 2 h20

Negative hydrogen evolution is in charge to 90% at the start, combined with oxygen reduction on the cathode and anode over potential of hydrogen to improve itself, to avoid a large amount of hydrogen evolution reaction.

For AGM sealed lead-acid batteries, while keep the battery in the AGM diaphragm most of the electrolyte, but must make 10% don't enter the electrolyte membrane pore. The anode generated through this part of the pore to the cathode oxygen is absorbed by the cathode.

The main component of the colloidal electrolyte is a functional compound with a particle size of almost nanometer. The rheology is good, and it is easy to carry out liquid filling of the lead storage battery. After the colloidal electrolyte enters the interior of the battery or is charged for several hours, it will gradually gel, and the liquid electrolyte will be transformed into a gel. The surfactant is added with various surfactants to help resist gelation before filling the battery. It helps to prevent the sulphation of the plates after filling the battery, reduces the corrosion of the grid, and improves the reaction utilization rate of the active materials of the plates.

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