Polymer electrolyte and preparation method thereof

The invention discloses a polymer electrolyte and a preparation method thereof. The polymer electrolyte comprises the following preparation raw materials of a carboxylic acid polymer, an amino compound and a lithium salt solution, and the molar ratio of the carboxylic acid polymer to the amino compound is (1-4): 1. According to the invention, the number of cross-linking nodes is regulated and controlled by changing the ratio of the carboxylic acid polymer to the amino compound, so that the cross-linking density is further influenced, the purpose of optimizing a polymer network skeleton is achieved, and the effective optimization of a lithium ion transmission path and the transmission efficiency is realized. Therefore, the framework parameter of the polymer electrolyte is controllable, the lithium ion transmission distance can be shortened, more lithium ions can be accommodated to enter pore channels, and the transmission efficiency of the lithium ions in a polymer network framework is further improved. Moreov