SECONDARY BATTERY AND ELECTRIC APPARATUS CONTAINING SAME

1 . A secondary battery, comprising an additive, wherein a structure of the additive is R 1 —X—R 0 , wherein X is one of carbon, nitrogen, silicon, phosphorus, and sulfur; R 0 comprises one or two non-polar groups; and R 1 is a polar chain group or a polar cyclic group, wherein the chain group comprises one or more of double bond, triple bond, and silicon-oxygen bond, and the cyclic group comprises one or more of three-membered heterocycle, four-membered heterocycle, five-membered heterocycle, and six-membered heterocycle.

2 . The secondary battery according to claim 1 , characterized in that R 0 is a fluorine-containing carbon chain; and optionally, R 0 is a perfluorocarbon chain.

3 . The secondary battery according to claim 2 , characterized in that R 0 contains 2 to 10 carbon atoms.

4 . The secondary battery according to claim 1 , wherein a number of main-chain carbon atoms of the additive is less than or equal to 20.

5 . The secondary battery according to claim 1 , characterized in that the double bond is provided by one or more of carboxylic ester, carboxylate, carbonate ester, carbonate, sulfonic ester, sulfonate, sulfate ester, sulfate, phosphoric ester, phosphate, carbon-carbon double bond, carbon-nitrogen double bond, silicate ester, or silicate; and/or the triple bond comprises carbon-carbon triple bond or carbon-nitrogen triple bond; and/or the silicon-oxygen bond is provided by silicate ester or silicate.

6 . The secondary battery according to claim 1 , characterized in that the cyclic group comprises one or more of structures in the following formulas I to IV:

wherein A 1 to A 4 are each independently selected from carbon, nitrogen, oxygen, sulfur, phosphorus, and silicon, and B 1 and B 2 are each independently selected from carbon, nitrogen, oxygen, sulfur, phosphorus, silicon, and branched chain of a group containing one or more of carboxylic ester, carboxylate, carbonate ester, carbonate, sulfonic ester, sulfonate, sulfate ester, sulfate, phosphoric ester, phosphate, silicate ester, silicate, carbon-carbon double bond, carbon-oxygen double bond, and carbon-nitrogen double bond.

7 . The secondary battery according to claim 1 , characterized in that the secondary battery comprises a positive electrode plate, a negative electrode plate, and an electrolyte, and the additive is applied to at least one of the positive electrode plate, the negative electrode plate, or the electrolyte.

8 . The secondary battery according to claim 7 , characterized in that the positive electrode plate comprises a positive electrode current collector and a positive electrode film layer formed on surface of the positive electrode current collector, and a mass percentage of the additive in the positive electrode film layer is 0.01% to 10%, optionally 0.05% to 8%.

9 . The secondary battery according to claim 7 , characterized in that the negative electrode plate comprises a negative electrode current collector and a negative electrode film layer formed on surface of the negative electrode current collector, and a mass percentage of the additive in the negative electrode film layer is 0.01% to 10%, optionally 0.5% to 10%.

10 . The secondary battery according to claim 7 , characterized in that a mass percentage of the additive in the electrolyte is 0.01% to 10%, optionally 0.01% to 5%.

11 . A battery module, characterized by comprising the secondary battery according to claim 1 .

12 . A battery pack, characterized by comprising the battery module according to claim 11 .

13 . An electric apparatus, characterized by comprising the battery pack according to claim 12 .