Composite silicon or composite tin particles
OwnerShailesh Upretiinventor
Life of this patent
Estimating the term…
Abstract
The specification relates to a composite particle for storing lithium. The composite particle is used in an electrochemical cell. The composite particle includes a metal oxide on the surface of the composite particle, a major dimension that is approximately less than or equal to 40 microns and a formula of MM′Z, wherein M is from the group of Si and Sn, M′ is from a group of Mn, Mg, Al, Mo, Bronze, Be, Ti, Cu, Ce, Li, Fe, Ni, Zn, Co, Zr, K, and Na, and Z is from the group of O, Cl, P, C, S, H, and F.
Claims38
A particle of a composite composition for use in an electrochemical cell comprising:
- a general formula of MM′Z, wherein M is from the group of Si and Sn, M′ is from a group of Mn, Mg, Al, Mo, Bronze, Be, Ti, Cu, Ce, Li, Fe, Ni, Zn, Co, Zr, K, and Na, and Z is from the group of O, Cl, P, C, S, H, and F;
- and
- a surface composition being an oxide;
- wherein a major dimension of the particle is less than 100 microns.
A particle of a composite composition for use in an electrochemical cell, the particle comprising:
- a hydrodynamic boundary, the hydrodynamic boundary being an approximate sphere;
- a diameter, the diameter being less than 100 microns;
- a multitude of intersecting rod shaped elements where within the particle;
- a surface composition, the surface composition is an oxide;
- and
- a bulk composition, the bulk composition being of a general formula of MM′Z, wherein M is from the group of Si and Sn, M′ is from a group of Mn, Mg, Al, Mo, Bronze, Be, Ti, Cu, Ce, Li, Fe, Ni, Zn, Co, Zr, K, and Na and Z is from the group of O, Cl, P, C, S, H, and F.
A particle of a composite composition for use in an electrochemical cell, the particle comprising:
- a major dimension, the major dimension ranging from 1 to 100 microns;
- a surface area, the surface area being >30 m2/g;
- an oxide component on the surface;
- and
- a general formula of MM′Z, wherein M is from the group of Si and Sn, M′ is from a group of Mn, Mg, Al, Mo, Bronze, Be, Ti, Cu, Ce, Li, Fe, Ni, Zn, Co, Zr, K, and Na and Z is from the group of O, Cl, P, C, S, H, and F.
A material for use in an electrochemical cell comprising:
- composite composition particles, the composite composition particles having a formula of MM′Z, a major dimension of the composite composition particles being less than 40 microns, the composite composition particles having a finger morphology, a textured surface and substantially lacking pores, wherein M is from a group including tin and silicon, M′ is a base metal of an alloy and Z is an amorphous component, a crystalline component or both.
An electrochemical rechargeable cell comprising:
- an anode comprising a particulate composite MM′Z, a binder and a solvent, the MM′Z composite being subtractively removed from an alloy in which M content is not dominant in the alloy and a cooling rate from a melt temperature of the alloy was sufficient to allow a formation of a structure having an extended M phase network and a substantially differentiated phase, the MM′Z composite including a portion of the M′ remaining within the structure, the MM′Z composite further including an amorphous component on the surface of the composite,
- wherein the structure of MM′Z composite particle possesses rods arranged in an array such that the rods are joined crystallographically and extend into space in a manner providing for a space of separation between crystallite extensions thereby accommodating for volume expansion when storing lithium.
A method of preparing a composite for storing lithium, the method comprising the steps of:
- subtractively removing a MM′Z composite particle from an alloy in which M content is not dominant in the alloy and a cooling rate from a melt temperature of the alloy was sufficient to allow a formation of a structure having an extended M phase network and a substantially differentiated phase, the MM′Z composite particle including a portion of the M′ remaining within the structure, the composite particle further including an amorphous component Z on the surface of the MM′Z composite particle,
- wherein the structure of MM′Z composite particle possesses rods arranged in an array such that the rods are joined crystallographically and extend into space in a manner providing for a space of separation between crystallite extensions thereby accommodating for volume expansion when storing lithium.
Dependencies are inferred from the claim text.