Gel diaphragm for new rare-earth power supply and preparation method thereof

Abstract

The present invention belongs to the field of polymer composites and functional materials, and relates to a gel diaphragm for a new rare-earth power supply and a preparation method thereof. After an Asolution and a B solution are mixed, a mixture is placed into a bucket for vacuum gel forming. Then, gel is cut into sheets and is heat-sealed with a diaphragm to obtain the gel diaphragm for a new rare-earth power supply, wherein the A solution is obtained by mixing magnesium lithium silicate, CMC and H2O, and the B solution is obtained by mixing a polymer and water. The gel diaphragm of the present invention is prepared under the combination of inorganic thixotropic gel and organic gel, is controllable in thickness and resistant to carbonization, and has high mechanical strength. The problem that a gel diaphragm with high mechanical strength cannot be prepared under conventional process treatment in the prior art is solved. The gel diaphragm of the present invention has the features ofhigh conductivity and low interfacial energy of a liquid electrolyte, and also has the advantage of good long-range stability of a solid electrolyte. The present invention also provides a preparationmethod of the gel diaphragm. The preparation method can realize industrialization and has good reproducibility. A production process of the preparation method is non-toxic, pollution-free and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of polymer composite functional materials, and relates to a rare earth new power supply gel diaphragm and a preparation method thereof. Background technique [0002] At present, the development of the automobile industry is facing many pressures, and the development of energy-saving and environmentally friendly new energy vehicles has become the consensus of automobile manufacturers all over the world. At present, the rare earth new power supply is the only battery system that has been actually verified and commercialized and scaled up in the battery system used in pure electric buses in cold regions. The pure electric buses that have been mass-produced and actually commercialized in the world all use rare earth New power system. In the field of rare earth new power supplies, my country has advantages in both technology and resources. Among them, the performance of nickel hydroxide is world-leading, and rare earth re...

AI Technical Summary

Problems solved by technology

However, in large-scale rare earth new power supplies, the absolute amount of liquid electrolyte absorbed by the diaphragm itself is low. In addition, there is a concentration difference in the liquid electrolyte in terms of height, which leads to unbalanced electrochemical reactions and affects the performance of the battery.

On the other hand, the gel electrolyte has relatively good uniformity and will not be delaminated, but its mechanical strength is low, and its own conductivity is still far from that of the liquid electrolyte.

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