▎ 摘　　要

NOVELTY - In-situ polymerization polymer solid electrolyte comprises high molecular weight compound A and low molecular weight compound B, electrolyte additive, lithium salt and inorganic nano particles. The high molecular weight compound A is a substituted compound containing R1-O-R2 and the low molecular weight compound B is a substituted compound containing-R1-O-R2, where the R1 and R2 comprises at least one of carbon atoms, boron atom, nitrogen atom, fluorine atom, aluminum atom, silicon atom, phosphorus atom, sulfur atom and/or titanium atoms, or a double bond, triple bond, ether oxygen group, ester group, cyanide group, boron oxygen group and siloxy and phosphoryloxy groups. The high molecular weight compound A and low molecular weight compound B contain at least one of substitutions, where the position of the substitution is on one atom or different atoms. USE - Used as in-situ polymerization polymer solid electrolyte. ADVANTAGE - The in-situ polymerization polymer solid electrolyte: can provide high uniformity in the battery and reduce the probability of serious local aging or battery thermal runaway caused by uneven heat distribution during the charging and discharging process; has high ionic conductivity and an electrochemical window in the range of 05V which can greatly improves battery performance; and improves battery preparation consistency without adding additional initiators thus save costs, and increases battery energy density. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) Battery comprises in-situ polymerization polymer solid electrolyte in between anode and cathode; (2) Preparing battery, comprising (a) mixing the high molecular weight compound A, the low molecular weight compound B, the electrolyte additive, the lithium salt and the inorganic nano particle, stirring, dispersing ultrasonically and filtering to form the solid electrolyte precursor solution; (b) injecting the solid electrolyte precursor solution through injection into the cathode and anode of the battery, placing the battery into the vacuum box after vacuumizing for sealing, allowing to stand the solid electrolyte precursor solution which is fully soaked in the battery, charging the battery to the charging cut-off voltage of the anode material, stopping charging, allowing to stand and discharging the battery to the discharge ending voltage of the anode material; and (c) initiating polymerization to form in-situ polymerization polymer solid electrolyte in the formation stage of the battery to obtain the in situ polymerization polymer solid electrolyte battery; and (3) Battery, preferably a secondary lithium battery comprises in-situ polymerized polymer solid electrolyte between the cathode and the anode; and (4) Preparing battery, preferably a secondary lithium battery, comprising mixing the high molecular weight compound A, low molecular weight compound B, electrolyte additive, lithium salt and inorganic nano particles, stirring, dispersing ultrasonically and filtering to form solid electrolyte precursor solution, injecting the solid electrolyte precursor solution through injection into the anode and the cathode of the secondary lithium battery, allowing to stand to make the solid electrolyte precursor solution fully soaked in the secondary lithium, charging the secondary lithium battery to the charging cut-off voltage of the anode material, stopping charging, allowing to stand, discharging the secondary lithium battery to the discharging end voltage of the anode material and initiating polymerization to form polymer solid electrolyte in the formation stage of the secondary lithium battery.