Metal sulfide composite materials for batteries
AssigneesSila Nanotechnologies, Inc., Georgia Tech Research Corporation
InventorsGleb Yushin, Feixiang Wu, Hyea Kim
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Abstract
Lithium-ion batteries are provided that variously comprise anode and cathode electrodes, an electrolyte, a separator, and, in some designs, a protective layer. In some designs, at least one of the electrodes may comprise a composite of (i) Li2S and (ii) conductive carbon that is embedded in the core of the composite. In some designs, the protective layer may be disposed on at least one of the electrodes via electrolyte decomposition. Various methods of fabrication for lithium-ion battery electrodes and particles are also provided.
Claims21
A lithium (Li)-ion battery, comprising:
- an anode electrode;
- a cathode electrode;
- a separator;
- and
- an electrolyte impregnating the anode electrode, the cathode electrode, and the separator,
- wherein:
- the anode electrode comprises both carbon (C)-comprising active material and silicon (Si)-comprising active material,
- the Si-comprising active material is present within hierarchical composite particles,
- the hierarchical composite particles each comprise a first external shell and a first core,
- the first core of each hierarchical composite particle comprises multiple Si nanoparticles incorporated within a first protective matrix, and
- the first protective matrix comprises carbon and one or more of the following:
- a polymer, an oxide, a sulfide, and a phosphate,
- wherein the cathode electrode comprises one or more cathode active materials that comprise one or more of the following:
- intercalation-type cathode material, conversion-type cathode material, and a mixture of the intercalation-type and the conversion-type cathode material,
- wherein the electrolyte comprises two or more salts, each of the salts comprising a cation selected from Li, Mg, and a rare earth metal, and an anion selected from bis(fluorosulfonyl)imide (FSI), bis(trifluoromethanesulfonyl)imide (TFSI), PF6, BF4, I, Br, and Cl, and
- wherein the hierarchical composite particles exhibit a type II shape, according to International Union of Pure and Applied Chemistry (IUPAC) classification, of nitrogen sorption curves collected at 77 K.
A Li-ion battery anode material composition, comprising:
- conductive carbon (C) active material;
- and
- silicon (Si)-comprising active material,
- wherein some or all of the Si active material is present within hierarchical composite particles,
- wherein the hierarchical composite particles each comprise a porous core and an external shell,
- wherein the porous core comprises multiple Si nanoparticles incorporated within a protective matrix,
- wherein the protective matrix of the hierarchical composite particles comprises carbon, pores and one or more of the following:
- a polymer, an oxide, a sulfide, and a phosphate,
- wherein the external shell of the hierarchical composite particles comprises carbon,
- wherein the hierarchical composite particles exhibit a cylindrical or fiber-like shape, and
- wherein the hierarchical composite particles exhibit a type II shape, according to International Union of Pure and Applied Chemistry (IUPAC) classification, of nitrogen sorption curves collected at 77 K.
Dependencies are inferred from the claim text.