LITHIUM-ION SECONDARY BATTERY

A lithium-ion secondary battery includes a positive electrode plate and a negative electrode plate, where the negative electrode plate includes a negative electrode current collector and a negative electrode active coating layer located on at least one surface of the negative electrode current collector, the negative electrode active coating layer includes a silicon-carbon material, and a mass content of element Si in the negative electrode active coating layer c ranges from 1.5% to 8.5%; the positive electrode plate includes lithium cobaltate; and an inflection point of a ZCV curve of the lithium-ion secondary battery corresponds to a value Z on an X axis, and Z ranges from 55% to 90%. The lithium-ion secondary battery of the present disclosure has a relatively high energy density and a relatively good low-temperature discharge performance.