Silicon　is　being　investigated　extensively　as　an　anodic　material　for　next-generation　lithium　ion　batteries　for　portable　energy　storage　and　electric　vehicles.　However,　the　large　changes　in　volume　during　cycling　lead　to　the　breakdown　of　the　conductive　network　in　Si　anodes　and　the　formation　of　an　unstable　solid-electrolyte　interface,　resulting　in　capacity　fading.　Here,　we　demonstrate　nanoparticles　with　a　Si@Mn22.6Si5.4C4@C　double-shell　structure　and　the　formation　of　self-organized　Si-Mn-C　nanocomposite　anodes　during　the　lithiation/delithiation　process.　The　anode　consists　of　amorphous　Si　particles　less　than　10　nm　in　diameter　and　separated　by　an　interconnected　conductive/buffer　network,　which　exhibits　excellent　charge　transfer　kinetics　and　charge/discharge　performances.　A　stable　specific　capacity　of　1100　mAhg(-1)　at　100　m.A.g(-1)　and　a　coulombic　efficiency　of　99.2%　after　30　cycles　are　achieved.　Additionally,　a　rate　capacity　of　343　mAh.g(-1)　and　a　coulombic　efficiency　of　99.4%　at　12000　mA.g(-1)　are　also　attainable.　Owing　to　its　simplicity　and　applicability,　this　strategy　for　improving　electrode　performance　paves　a　way　for　the　development　of　high-performance　Si-based　anodic　materials　for　lithium　ion　batteries.