Spray pyrolysis of yolk-shell particles and their use for anodes in lithium-ion batteries

We demonstrate the synthesis of yolk-shell particles using spray-pyrolysis, a technique with proven scalability to industrial production level. Nickel oxide (shell)-silicon (yolk) particles are produced using a single-step aerosol reaction from a mixture of commercial, off-the-shelf precursors. After coating and annealing in the presence of polyvinylpyrrolidone, the nickel oxide shell is converted into a porous nickel cage enclosing the silicon particles. The polymer decomposition leads to the formation of an amorphous carbon layer surrounding the nickel cage. This structure maintains a high specific discharge capacity after more than 100 cycles (similar to 1400 mAh/g at the 110th cycle with a 0.5 C discharge rate, on a silicon basis) when used as anode for lithium-ion batteries. (C) 2015 Elsevier B.V. All rights reserved.