A kind of binder preparation process for solar cell back electrode paste

Abstract

The invention discloses a binder preparation process for solar cell back electrode paste. The method comprises the following steps of: the step 1, mixing 40-50 parts of modified konjac flour and 20-30parts of degreased starch, then adding 25-35 parts of deionized water into the mixture with stirring, adding 5-15 parts of modified montmorillonite into the mixture, and stirring the mixture at a rotational speed up to 300-400 r / min for 20-30min. The modified konjac flour aqueous solution is large in viscosity, has higher viscosity intensity than these of other biological adhesives, can be used as the main material of the binder and is modified by employing the lignin phenolating liquid to enhance the activity of the konjac flour and increase the hydroxyl groups contained on the surface, andthe defatted starch contains a lot of hydroxyl groups.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a preparation process of a binder used for solar cell back electrode paste. Background technique [0002] Solar energy is a new energy source, which has attracted more and more attention. To convert solar energy into electrical energy requires the use of photovoltaic panels. Photovoltaic panel components are a power generation device that generates direct current when exposed to sunlight. Solar energy is utilized by almost all Composed of solid photovoltaic cells made of semiconductor materials (such as silicon), since there are no moving parts, they can operate for a long time without causing any loss. Simple photovoltaic cells can provide energy for watches and computers. More complex photovoltaic systems It can provide lighting, traffic lights and monitoring systems for houses, and can be connected to the grid for power supply. Photovoltaic panel components can be made int...

AI Technical Summary

Problems solved by technology

[0003] Although the existing binder is environmentally friendly, its performance will deteriorate after long-term exposure to light, resulting in a decrease in the adhesion between the electrode slurry and the photovoltaic panel. At the same time, the mixing of raw materials will easily lead to the agglomeration of the electrode slurry and affect the photoelectric conversion efficiency. The existing Chinese patent document (notification number: CN105469854B) discloses a plant source composite binder for polycrystalline silicon solar cell light back electrode slurry, the content of each component is calculated by weight: 6-10 parts of gum arabic, brown algae 2-6 parts of glue, 0.2-2 parts of squash glue, 0.05-0.2 parts of talcum powder, and 100 parts of water. Although the binder is environmentally friendly, it has a high degree of crosslinking and is easy to agglomerate, so that the electrode slurry cannot be well dispersed. , affecting the photoelectric conversion efficiency

[0004] Chinese patent document (notification number: CN106675449B) discloses a high-safety negative electrode slurry binder for lithium ion batteries, which is made of raw materials such as sodium carboxymethyl cellulose, styrene-butadiene rubber, sodium alginate and binder additives , although the binder has good bonding performance, but the raw material of styrene-butadiene rubber will affect the photoelectric conversion efficiency of the electrode slurry

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