An all-solid secondary battery, including: a cathode; an anode; and a solid electrolyte layer disposed between the cathode and the anode, wherein the anode comprises an anode current collector; a first anode active material layer in contact with the anode current collector and comprising a first metal; a second anode active material layer disposed between the first anode active material layer and the solid electrolyte layer and comprising a carbon-containing active material; and a contact layer between the second anode active material layer and the solid electrolyte layer, and disposed such that the contact layer prevents contact between the second anode active material layer and the solid electrolyte layer, wherein the contact layer comprises a second metal, and has a thickness less than a thickness of the first anode active material layer.

A metal negative electrode and a method of making the metal negative electrode is disclosed. The metal negative electrode includes a metal negative electrode body and a protective layer formed on a surface of one side or each of two sides of the metal negative electrode body. The protective layer includes a liquid-state or gel-state inner layer that has an ability to dissolve alkali metal and a solid-state outer layer has a high ionic conductivity. The liquid-state or gel-state inner layer includes at least one of an aromatic hydrocarbon small molecule compound or a polymer containing an aromatic hydrocarbon group that each have an ability to accept an electron, and at least one of an ether small molecule solvent, an amine small molecule solvent, a thioether small molecule solvent, a polyether polymer, a polyamine polymer, or a polythioether polymer that each have an ability to complex lithium ions.

A metal negative electrode and a method of making the metal negative electrode is disclosed. The metal negative electrode includes a metal negative electrode body and a protective layer formed on a surface of one side or each of two sides of the metal negative electrode body. The protective layer includes a liquid-state or gel-state inner layer that has an ability to dissolve alkali metal and a solid-state outer layer has a high ionic conductivity. The liquid-state or gel-state inner layer includes at least one of an aromatic hydrocarbon small molecule compound or a polymer containing an aromatic hydrocarbon group that each have an ability to accept an electron, and at least one of an ether small molecule solvent, an amine small molecule solvent, a thioether small molecule solvent, a polyether polymer, a polyamine polymer, or a polythioether polymer that each have an ability to complex lithium ions.

Systems and methods for all-conductive battery electrodes may include an electrode coating layer on a current collector, where the electrode coating layer comprises more than 50% silicon, and where each material in the electrode has a resistivity of less than 100 Ω-cm. The silicon may have a resistivity of less than 10 Ω-cm, less than 1 Ω-cm, or less than 1 mΩ-cm. The electrode coating layer may comprise pyrolyzed carbon and/or conductive additives. The current collector comprises a metal foil. The metal current collector may comprise one or more of a copper, tungsten, stainless steel, and nickel foil in electrical contact with the electrode coating layer. The electrode coating layer comprises more than 70% silicon. The electrode may be in electrical and physical contact with an electrolyte. The electrolyte may comprise a liquid, solid, or gel. The battery electrode may be in a lithium ion battery.

Systems and methods for all-conductive battery electrodes may include an electrode coating layer on a current collector, where the electrode coating layer comprises more than 50% silicon, and where each material in the electrode has a resistivity of less than 100 Ω-cm. The silicon may have a resistivity of less than 10 Ω-cm, less than 1 Ω-cm, or less than 1 mΩ-cm. The electrode coating layer may comprise pyrolyzed carbon and/or conductive additives. The current collector comprises a metal foil. The metal current collector may comprise one or more of a copper, tungsten, stainless steel, and nickel foil in electrical contact with the electrode coating layer. The electrode coating layer comprises more than 70% silicon. The electrode may be in electrical and physical contact with an electrolyte. The electrolyte may comprise a liquid, solid, or gel. The battery electrode may be in a lithium ion battery.

A method of manufacturing an all-solid-state battery cell includes depositing an interlayer directly onto an anode current collector; depositing a solid electrolyte onto the interlayer opposite the anode current collector; forming a cathode on the solid electrolyte opposite the interlayer, wherein the cathode contains one or more lithium-containing compounds; and applying pressure to achieve uniform contact between layers. The manufactured all-solid-state battery cell is anode-free prior to charging. The interlayer is configured such that lithium metal is deposited between the interlayer and the anode current collector during charging, the interlayer prevents contact between the lithium metal and the solid electrolyte, and the interlayer has a greater density than a density of the solid electrolyte.

Disclosed are an all-solid-state battery that may have uniform deposition of lithium and have excellent durability, and a method of manufacturing the same.

Disclosed are an all-solid-state battery that may have uniform deposition of lithium and have excellent durability, and a method of manufacturing the same.

A block or graft copolymer coated lithium metal electrode provides the negative electrode and the solid electrolyte for a rechargeable lithium metal battery that further includes a positive electrode. Optionally, the positive electrode includes elemental sulfur in a conductive matrix. The copolymer coated lithium metal electrode may be manufactured by a process involving electroplating lithium metal through a copolymer coated conductive substrate, for which the copolymer coated conductive substrate has been prepared by coating the conductive substrate in a copolymer solution followed by evaporating the solvent. Alternatively, a lithium metal electrode may be coated directly with copolymer. Rechargeable lithium batteries according to embodiments of the invention have improved cycle life and combustion resistance compared to lithium metal batteries manufactured by conventional methods.

The present invention relates to a cathode active material for a secondary battery and a manufacturing method thereof. A cathode active material, according to one embodiment of the present invention, comprises silicon-based primary particles, and a particle size distribution of the silicon-based primary particles is D10≥50 nm and D90≤150 nm. The cathode active material suppresses or reduces tensile hoop stress generated in lithiated silicon particles during a charging of a battery to thus suppress a crack due to a volume expansion of the silicon particles and/or an irreversible reaction caused by the crack, such that the lifetime and capacity of the battery can be improved.