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Doped Si nanoparticles with conformal carbon coating and cyclized-polyacrylonitrile network as high-capacity and
Ming Xie1, Daniela Molina Piper, Miao Tian
1Wuhan ATMK Super EnerG Technologies Inc., Wuhan, People's Republic of China.
Abstract:
Doped Si nanoparticles (SiNPs) with conformal carbon coating and cyclized-polyacrylonitrile (PAN) network displayed capacities of 3500 and 3000 mAh g(-1) at C/20 and C/10, respectively. At 1 C, the electrode preserves a specific discharge capacity of ∼1500 mAh g(-1) for at least 60 cycles without decay. Al2O3 atomic layer deposition (ALD) helps improve the initial Coulombic efficiency (CE) to 85%. The dual coating of conformal carbon and cyclized-PAN help alleviate volume change and facilitate charge transfer. Ultra-thin Al2O3 ALD layers help form a stable solid electrolyte interphase interface.
