Freestanding flexible Ni12P5 in bacteria based carbon @ reduced graphene oxides paper for lithium-ion anode

•Biological application of using bacteria in electrochemical energy storage.•In situ fabricate freestanding flexible Ni12P5 –carbon @ RGO paper anode.•The Ni12P5 particles are perfectly and fully coated by bacteria based carbon.•The nature yolk-shell-structure can afford volume expansion of charge/discharge.