Lithium secondary battery, battery pack and electronic device including same

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

Disclosed are a lithium secondary battery, a battery pack and an electronic device.

Key novelty

The lithium secondary battery includes: a positive electrode comprising a positive electrode active material; a negative electrode comprising a negative electrode active material; a separator between the positive electrode and the negative electrode; and an electrolyte, wherein the positive electrode active material comprises a lithium transition metal compound comprising nickel (Ni), cobalt (Co) and manganese (Mn), wherein the lithium transition metal compound comprises a form of single particles having at least one of a single primary particle or an aggregate of 2 or more and 30 or less of primary particles, wherein the single particles comprise crystal grains of the lithium transition metal compound therein, wherein the negative electrode active material comprises a silicon carbon composite having Si crystal grains therein, and wherein the size of the Si crystal grains of the silicon carbon composite is 10% or less of the size of the crystal grains of the lithium transition metal compound.

Applications

Relevant search intents