A technique that can improve ionic conductivity is provided.

An electrolyte includes an inorganic composite particle that is a composite of an inorganic particle with a compound having a betaine structure and one or more functional groups selected from a (meth)acryloxy group, a Si(OR).sub.3 group (R is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms), and an Al(OR).sub.2 group (R is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms).

A solid state battery including a positive electrode layer, a negative electrode layer, and a solid electrolyte layer interposed between the positive electrode layer and the negative electrode layer, wherein the positive electrode layer includes a positive electrode active material in which a spacing d.sub.003 of a lattice plane (003) is 4.800 Å or more in a charged state at a positive electrode potential of 4.55 V.

A main object of the present disclosure is to provide an all solid state battery with low battery resistance. The present disclosure achieves the object by providing an all solid state battery including a cathode layer, an anode layer, a solid electrolyte layer formed between the cathode layer and the anode layer; wherein the anode layer contains a lithium titanate that is an anode active material, and a solid electrolyte; a proportion of the anode active material with respect to a total of the anode active material and the solid electrolyte is 40 volume % or more and 80 volume % or less; and the anode layer does not contain a conductive material.

An all-solid-state battery includes: an electrode body that is provided with a laminate including an anode current collector layer, an anode composite material layer, a solid electrolyte layer, a cathode composite material layer, and a cathode current collector layer; an outer encasement member that envelops the electrode body; and a protective member with electrically insulating properties that is disposed on a side surface of the laminate. The protective member has a groove extending along a direction in which a surface of the laminate extends.

A main object of the present disclosure is to provide a lithium solid battery in which the coulomb efficiency of the battery upon deposition and dissolution of a metal lithium is improved. The above object is achieved by providing a lithium solid battery comprising: an anode current collector, a solid electrolyte layer, a cathode active material layer, and a cathode current collector; wherein the lithium solid battery comprises a Li storing layer between the anode current collector and the solid electrolyte layer; an amount of Li storage of the Li storing layer to a cathode charging capacity is 0.13 or more; and a thickness of the Li storing layer is 83 μm or less.

The present invention provides an electrolyte for a lithium secondary battery and a lithium secondary battery including the same, the electrolyte including a polymer, and one or more selected from the group consisting of an inorganic solid electrolyte particle and a ferrodielectric, wherein the polymer includes one or more selected from the group consisting of a polymer represented by Formula 1 and a polymer including a repeating unit represented by Formula 2.

A composite electrode. The composite electrode including an active material, a conductive additive, a binder, and a solvent. The composite electrode may be cast or printed.

An all-solid-state battery comprises a cathode active material layer, an anode active material layer and a solid electrolyte layer interposed between the cathode active material layer and the anode active material layer, and wherein the all-solid-state battery satisfies Requirement 1 below,

3<(b.sub.1+b.sub.2)/a[10.sup.−4.Math.cm.sup.3/mA]<11,  [Requirement 1] wherein, a indicates current density [mA/cm.sup.2] of the all-solid-state battery, b.sub.1 indicates surface roughness [μm] of one side of a cathode active material layer in a direction to a solid electrolyte layer, and b.sub.2 indicates surface roughness [μm] of one side of an anode active material layer in a direction to the solid electrolyte layer.

A method is for the manufacture of materials used in electrochemical energy storage devices. The manufacturing utilizes processing of the material layers by pressure and/or temperature, a porous, non-conducting substrate web (1A, 1B, 1C). An organic solid electrolyte (2A, 2B, 2C) is attached to and impregnated into the substrate web. The manufacturing processes a lithium-metal anode (11), and a cathode layer containing cathode-material particles together with polymer solid electrolyte and/or inorganic solid electrolyte and/or liquid electrolyte as well as with other necessary constituents.

A lithium-sulfur battery includes: a substrate; a composite cathode disposed on the substrate; a solid-state electrolyte disposed on the composite cathode; and a lithium anode disposed on the solid-state electrolyte, such that the composite cathode comprises: active elemental sulfur, conductive carbon, and sulfide electrolyte, and the sulfide electrolyte is uniformly coated on at least one surface of the conductive carbon. A method of forming a composite cathode for a lithium-sulfur battery includes: synthesizing dispersed carbon fiber from cotton to form carbonized dispersed cotton fiber (CDCF) powder; in-situ coating of the CDCF with an electrolyte component to form a composite powder; and mixing active elemental sulfur powder with the composite powder to form the composite cathode.