A lithium iron phosphate positive electrode active material includes a first lithium iron phosphate material and a second lithium iron phosphate material. D.sup.1.sub.mo is a first particle size of first particles that have a largest volume distribution value of the first lithium iron phosphate material, and 0.3D.sup.1.sub.mo3.2. D.sup.2.sub.mo is a second particle size of second particles that have a largest volume distribution value of the second lithium iron phosphate material, 1D.sup.2.sub.mo5, and D.sup.1.sub.mo<D.sup.2.sub.mo. A distribution discreteness of the first particle size of the first lithium iron phosphate material is A.sub.1, and a distribution discreteness of the second particle size of the second lithium iron phosphate material is A.sub.2, where 1A.sub.13, and 2A.sub.24. D.sup.1.sub.mo and A.sub.1 meet: 4.07<A.sub.1(2.31+D.sup.1.sub.mo)<16, and D.sup.2.sub.mo and A.sub.2 meet: 0.4<A.sub.2(D.sup.2.sub.mo1.15)<14.

The present invention relates to an anode including multiple current collectors juxtaposed in parallel, and a secondary battery comprising same, wherein the anode enables providing a high-capacity secondary battery while suppressing volume changes due to a silicone component-containing active material employed therein.

In an embodiment, a Li-ion battery cell comprises an anode electrode with an electrode coating that (1) comprises Si-comprising active material particles, (2) exhibits an areal capacity loading in the range of about 3 mAh/cm.sup.2 to about 12 mAh/cm.sup.2, (3) exhibits a volumetric capacity in the range from about 600 mAh/cc to about 1800 mAh/cc in a charged state of the cell, (4) comprises conductive additive material particles, and (5) comprises a polymer binder that is configured to bind the Si-comprising active material particles and the conductive additive material particles together to stabilize the anode electrode against volume expansion during the one or more charge-discharge cycles of the battery cell while maintaining the electrical connection between the metal current collector and the Si-comprising active material particles.

The present disclosure provides a cable-type secondary battery, comprising: an inner electrode; a separation layer surrounding the outer surface of the inner electrode to prevent a short circuit between electrodes; and a sheet-form outer electrode spirally wound to surround the separation layer or the inner electrode.

An object is to provide an aluminum plate having favorable coating properties and pre-doping characteristics. An aluminum plate having a plurality of through holes that penetrate in a thickness direction, in which an average opening diameter of the through holes is 1 m to 100 m, a density of the through holes is 50 through holes/mm.sup.2 to 2,000 through holes/mm.sup.2, and an inter-hole distance between adjacent through holes is 300 m or less.

Systems and methods for use of perforated anodes in silicon-dominant anode cells may include a cathode, an electrolyte, and an anode, where the cathode and anode each comprise an active material on a current collector. Both of the current collector and active material may be perforated. For example, the current collector may be perforated and/or both the current collector and active material may be perforated. The battery may comprise a stack of anodes and cathodes. Each cathode of the stack may be perforated and/or each anode of the stack may be perforated. Each cathode of the stack may comprise two layers of active material on each side of the cathode where a first of the two layers of active material may be for prelithiation of anodes of the battery. A second of the two layers may be for lithium cycling of the battery.

Systems and methods for use of perforated anodes in silicon-dominant anode cells may include a cathode, an electrolyte, and an anode, where the cathode and anode each comprise an active material on a current collector. One or both of the current collector and active material may be perforated. For example, the current collector may be perforated and/or both the current collector and active material may be perforated. The battery may comprise a stack of anodes and cathodes. Each cathode of the stack may be perforated and/or each anode of the stack may be perforated. Each cathode of the stack may comprise two layers of active material on each side of the cathode where a first of the two layers of active material may be for prelithiation of anodes of the battery. A second of the two layers may be for lithium cycling of the battery.

The present disclosure relates to an electrode for a secondary battery, including: an electrode current collector including a coated portion and a non-coated portion, and an active material layer located on the coated portion of the electrode current collector, wherein at least perforated portion is formed on the boundary surface between the coated portion and the non-coated portion.

In an embodiment, a Li-ion battery cell comprises an anode electrode with an electrode coating that (1) comprises Si-comprising active material particles, (2) exhibits an areal capacity loading in the range of about 3 mAh/cm.sup.2 to about 12 mAh/cm.sup.2, (3) exhibits a volumetric capacity in the range from about 600 mAh/cc to about 1800 mAh/cc in a charged state of the cell, (4) comprises conductive additive material particles, and (5) comprises a polymer binder that is configured to bind the Si-comprising active material particles and the conductive additive material particles together to stabilize the anode electrode against volume expansion during the one or more charge-discharge cycles of the battery cell while maintaining the electrical connection between the metal current collector and the Si-comprising active material particles.

A method for manufacturing an anode electrode includes providing a first substrate, a second substrate, and an anode current collector. The method includes forming a first lithium metal layer on the first substrate and a second lithium metal layer on the second substrate. The method includes pressing the first lithium metal layer and the second lithium metal layer into the anode current collector to form an anode electrode.