A negative electrode active material for a lithium secondary battery, which includes a silicon-based particle represented by M-SiO.sub.x, wherein M is Li, Mg, Ca, Al, or Ti, and 0x<2, wherein the M-SiO.sub.x includes an amorphous phase at 20 wt % to 70 wt % based upon a total weight of the M-SiO.sub.x, thereby exhibiting excellent initial efficiency and lifespan characteristics, and a preparation method thereof.

A negative electrode active material for a lithium secondary battery, which includes a silicon-based particle represented by M-SiO.sub.x, wherein M is Li, Mg, Ca, Al, or Ti, and 0x<2, wherein the M-SiO.sub.x includes an amorphous phase at 20 wt % to 70 wt % based upon a total weight of the M-SiO.sub.x, thereby exhibiting excellent initial efficiency and lifespan characteristics, and a preparation method thereof.

The present application relates to a porous material and preparation methods thereof, and anodes and devices including the same. The porous material provided by the present application includes a material of the formula Si.sub.aM.sub.bO.sub.x, wherein the ratio of x to a is about 0.6 to about 1.5, and the ratio of a to b is about 8 to about 10,000, wherein M includes at least one selected from the group consisting of Al, Si, P, Mg, Ti and Zr. The anode and an electrochemical device including the porous material exhibit higher rate performance, higher first coulombic efficiency, higher cycle stability and lower cycle expansion ratio.

The present application relates to a porous material and preparation methods thereof, and anodes and devices including the same. The porous material provided by the present application includes a material of the formula Si.sub.aM.sub.bO.sub.x, wherein the ratio of x to a is about 0.6 to about 1.5, and the ratio of a to b is about 8 to about 10,000, wherein M includes at least one selected from the group consisting of Al, Si, P, Mg, Ti and Zr. The anode and an electrochemical device including the porous material exhibit higher rate performance, higher first coulombic efficiency, higher cycle stability and lower cycle expansion ratio.

Nanoparticles and method for producing uniform silicate-based nanoparticles are disclosed. The method comprises a step of injecting into tubular branched elements comprising static mixers a first aqueous solution comprising a water-soluble silicate compound and a second aqueous solution comprising a water-soluble compound releasing cationic species in solution, and allowing the reaction between the first and the second aqueous solutions in a micro-mixing regime, the method being characterized in that the overall mixing time is kept below 10.sup.5 s. A further step of allowing the solution obtained in the micro-mixing regime to mix in a macromixing regime. Nanoparticles obtained through the present method are also disclosed.

Nanoparticles and method for producing uniform silicate-based nanoparticles are disclosed. The method comprises a step of injecting into tubular branched elements comprising static mixers a first aqueous solution comprising a water-soluble silicate compound and a second aqueous solution comprising a water-soluble compound releasing cationic species in solution, and allowing the reaction between the first and the second aqueous solutions in a micro-mixing regime, the method being characterized in that the overall mixing time is kept below 10.sup.5 s. A further step of allowing the solution obtained in the micro-mixing regime to mix in a macromixing regime. Nanoparticles obtained through the present method are also disclosed.

The present invention relates to a porous silicon-based composite, a preparation method therefor, and an anode active material comprising same, and, more specifically, the porous silicon-based composite comprises silicon particles and fluoride, and thus a porous silicon-based composite with excellent selective etching efficiency can be obtained, and the anode active material comprising same can further improve a discharge capacity and a capacity retention while holding the excellent initial efficiency of a secondary battery.

The present invention relates to a porous silicon-based composite, a preparation method therefor, and an anode active material comprising same, and, more specifically, the porous silicon-based composite comprises silicon particles and fluoride, and thus a porous silicon-based composite with excellent selective etching efficiency can be obtained, and the anode active material comprising same can further improve a discharge capacity and a capacity retention while holding the excellent initial efficiency of a secondary battery.

Stable mineral slurries and methods of making stable mineral slurries.

Stable mineral slurries and methods of making stable mineral slurries.