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High-capacity lithium-containing alloy anodes (e.g.,Li4.4Si,Li4.4Sn,and Li3P) enable lithium-free cathodes (e.g.,Sulfur,V2O5,and FeF3) to produce next-generation lithium-ion batteries (LIBs) with high energy density.Herein,we design a Li3P/C nanocomposite with Li3P ultrafine nanodomains embedded in micrometer-scale porous carbon particles.Benefiting from the unique micro/nanostructure of the Li3P/C nanocomposite,electrons transfer rapidly through the conductive pathway provided by the porous carbon framework and the volume change between Li3P and P is confined in the nanopores of the carbon,which avoids the collapse of the whole Li3P/C composite particles.As expected,the as-achieved Li3P/C nanocomposite provided a high available lithium-ion capacity of 791 mAh/g (calculated based on the mass of Li3P/C) at 0.1 C during the initial delithiation process.Meanwhile,the Li3P/C nanocomposite showed 75％ of its 0.5 C capacity at 6 C and stable cycling stability.