| 摘要 |
PURPOSE: A lithium secondary battery is provided to improve conductivity of a battery, to prevent degradation of a battery due to volume prevention during charging and discharging, and to prevent degradation of conductivity. CONSTITUTION: An active material-conductive material composite particle is that one or more active material selected from silicon-based, tin-based, and silicon-carbon-based,and a conductive material are combined with each other, and comprises a coupling agent with a density of 0.001-10 %. The coupling agent is one or more selected from a silane group, a vinyl group, an epoxy group, a styryl group, a methacryloxy group, an acyloxy group, an amino group, a mercapto group, an isocyanate, a chloro propyl group, and a sulfide. A lithium secondary battery comprises a negative electrode active material which comprises the active material-conductive material composite particle. [Reference numerals] (AA) Embodiment 2 Charge; (BB) Embodiment 2 Discharge; (CC) Comparative embodiment charge; (DD) Comparative embodiment discharge |
