NOVELTY - The process comprises preparing composite particles (20) of a lithium storage material (12) in an amorphous phase and a material (14) that is immiscible with the lithium storage material, inducing a phase separation in the composite particles to precipitate the lithium storage material in the amorphous phase and to form phase-separated composite particles, and chemically etching the immiscible material from the phase-separated composite particles such that porous amorphous lithium storage material particles are formed.    USE - The process is useful for preparing a porous amorphous lithium storage material, which is useful in an anode of a lithium ion battery (all claimed), where the lithium ion battery is useful as a power source in stationary and portable devices in consumer electronic, automobile, and aerospace industries.    ADVANTAGE - The process is capable of preparing the porous amorphous lithium storage material with increased surface area (100 m2/g), improved current efficiency and sufficient amount of free space to accommodate the large volume change during charging/discharging, thus improving energy density, lifespan, stability and charging and discharging capacities of the battery.    DETAILED DESCRIPTION - The process comprises preparing composite particles (20) of a lithium storage material (12) in an amorphous phase and a material (14) that is immiscible with the lithium storage material, inducing a phase separation in the composite particles to precipitate the lithium storage material in the amorphous phase and to form phase-separated composite particles, and chemically etching the immiscible material from the phase-separated composite particles such that porous amorphous lithium storage material particles are formed. The step of preparing the composite particles includes melting the lithium storage material and the immiscible material together to form a mixture, solidifying the mixture to form a composite including the lithium storage material in the amorphous phase, and milling the composite to form the composite particles. The method further comprises tailoring a size of pores (24) formed in the porous, amorphous lithium storage material particles by controlling an atomic ratio of the lithium storage material to the immiscible material used to form the mixture, controlling the atomic ratio of the lithium storage material to the immiscible material to be greater than 1 such that the phase separated composite particles include a matrix of the amorphous phase lithium storage material having the immiscible material, controlling the atomic ratio of the lithium storage material to the immiscible material to be less than or equal to 1 such that the phase separated composite particles include a matrix of the immiscible material having the amorphous phase lithium storage material, selecting the lithium storage material, selecting the immiscible material, adding a nucleation additive to the mixture to control a size of pores formed in the porous lithium storage material particles, and applying a passivation layer on a surface of the porous, amorphous lithium storage material particles. The solidifying step is carried out by cooling the mixture at a rate of 102-105 K/s. The milling step is carried out using cryo ball milling to reduce a size of the composite particles to less than 20 mu m. The step of preparing the composite particles further includes delivering a first carrier gas including a lithium storage material precursor and a second carrier gas including an immiscible material precursor to a heating zone having a predetermined temperature for forming an alloy vapor of the lithium storage material and the immiscible material and delivering the alloy vapor to a cooling zone having a predetermined temperature for forming the composite particles. The predetermined temperature of the heating zone is more than 1000 degrees C. The predetermined temperature of the cooling zone is less than -20 degrees C. The atomic ratio of the lithium storage material to the immiscible material in the composite particles is controlled by controlling a flow rate of the first carrier gas and/or the second carrier gas. The inducing step is carried out by annealing the composite particles at a temperature of 300-900 degrees C. The chemically etching step is carried out using an acid. INDEPENDENT CLAIMS are included for:    (1) a lithium storage material; and    (2) an anode for a lithium ion battery.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a method for making a porous lithium storage material.    Lithium storage material (12)    Immiscible material (14)    Mixture of lithium storage material and immiscible material (16)    Composite particles (20)    Pores. (24)