Si nanocrystallites embedded in hard TiFeSi2 matrix as an anode material for Li-ion batteries

► A Si-TiFeSi2 composite was synthesized by arc melting followed by rapid quenching. ► The composite consisted of Si nanocrystallites uniformly embedded in a TiFeSi2 matrix. ► Si was transformed into amorphous Li-Si alloy, but TiFeSi2 remained inactive. ► The anode showed a reversible capacity of 1200 mAh g−1 over 50 cycles. ► Only nano-cracks at Si-rich sites was observed and the hard matrix endured the stress.