NOVELTY - Rechargeable lithium battery (1) (I) comprises: a positive electrode (3) comprising a positive active material for intercalating and deintercalating lithium ions; a negative electrode (2) comprising a negative active material for intercalating and deintercalating lithium ions; and a polymer electrolyte comprising a polymer, a non-aqueous organic solvent and a lithium salt, where the polymer comprises a polymerization product of two monomers.    USE - (I) is useful as a power source in portable electronic equipments.    ADVANTAGE - (I) has a battery capacity per unit area of the positive electrode of 3.3-2.8 mAh/cm2. (I) does not leak, is safe, stable at high temperatures and resist an external impact to some extent. (I) can withstand an external physical impact, has a high capacity and has a relatively high battery performance. (I) has: high battery strength; a high capacity; and improved cycle life.    DETAILED DESCRIPTION - Rechargeable lithium battery (1) (I) comprises: a positive electrode (3) comprising a positive active material for intercalating and deintercalating lithium ions; a negative electrode (2) comprising a negative active material for intercalating and deintercalating lithium ions; and a polymer electrolyte comprising a polymer, a non-aqueous organic solvent and a lithium salt, where the polymer comprises a polymerization product of a first monomer of formula (A-U1-B1) and a second monomer having at least one structure of formula CH2=CL1-C(=O)-O-M, CH2=CL1-O-M, CH2=CL1-O-C(=O)-M, CH2=CH-CH2-O-M, CH2=CH-S(=O)2-M or CH2=CL1-C(=O)-O-CH2-CH2-NH-C(=O)-O-M, at a weight ratio of the first monomer to the second monomer of 85:15-50:50.    U1 = a moiety of polyesterpolyol;    A, B1 = CH2=CR-C(=O)-, CH2=CR-O-CH2-, CH2=CR-, CH2=CR-O-C(=O)-, CH2=CR-CH2-, CH2=CR-CH2-O-, CH2=CH-S(=O)2- or CH2=CR-C(=O)-O-CH2-CH2-NH-C(=O)-;    R = H, 1-10C hydrocarbyl or 6-10C aromatic hydrocarbyl;    L1 = H, 1-10C hydrocarbyl or 6-10C aromatic hydrocarbyl; and    M = 1-20C hydrocarbyl, 1-20C halogenated hydrocarbyl, 6-20C aromatic hydrocarbyl or 6-20 halogenated aromatic hydrocarbyl.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a rechargeable lithium battery.    Rechargeable lithium battery (1)    Negative electrode (2)    Positive electrode (3)    Separator (4)    Battery case. (5)