Lithium-ion battery

A lithium-ion battery, comprising:

• an electrode assembly;
• an electrolyte immersing the electrode assembly and comprising a lithium salt and an organic solvent;
• and a case;
• wherein the electrode assembly comprises:
• a negative electrode plate comprising a negative electrode collector and a negative electrode film, the negative electrode film is provided on a surface of the negative electrode collector and comprises a negative electrode active material;
• a positive electrode plate comprising a positive electrode collector and a positive electrode film, the positive electrode film is provided on a surface of the positive electrode collector and comprises a positive electrode active material;
• and
• a separator provided between the negative electrode plate and the positive electrode plate;
• wherein
• the negative electrode active material at least comprises a carbon-based negative electrode material, and the carbon-based negative electrode material in the negative electrode film exists in a form of a pre-lithium-intercalation compound LiCx formed by lithiation with a lithium metal, 12≤x≤150;
• a capacity of the negative electrode active material per unit area/(a capacity of the positive electrode active material per unit area+a capacity of active lithium ions of the pre-lithium-intercalation compound LiCx which can be intercalated and deintercalated in the negative electrode film per unit area)≥1.10;
• the organic solvent in the electrolyte comprises a cyclic ester, and a mass of the cyclic ester is equal to or less than 10% of a total mass of the organic solvent in the electrolyte;
• and
• 1.2≥the capacity of the negative electrode active material per unit area/the capacity of the positive electrode active material per unit area≤2.1.