Silicon-based material and preparation method thereof, composite negative electrode material, secondary battery and electric device

The invention provides a silicon-based material and a preparation method thereof, a composite negative electrode material, a secondary battery and an electric device, the silicon-based material comprises: a silicon nanowire, the axial direction of the silicon nanowire is 1t; 111gt, 111gt; direction. The silicon-based material provided by the invention can prolong the cycle life of the secondary battery.