An electrode composite body includes: an active material molded body including active material particles which include a lithium composite oxide and have a particle shape, and a communication hole that is provided between the active material particles; a first solid electrolyte layer that is provided on a surface of the active material molded body, and includes a first inorganic solid electrolyte; and a second solid electrolyte layer that is provided on the surface of the active material molded body, and includes a second inorganic solid electrolyte of which a composition is different from a composition of the first inorganic solid electrolyte, and which contains boron as a constituent element and is crystalline.

A solid electrolyte represented by general formula Li.sub.ySiR.sub.x(MO.sub.4), where x is an integer from 1 to 3 inclusive, y=4−x, each R present is independently C1-C3 alkyl or C1-C3 alkoxy, and M is sulfur, selenium, or tellurium. Methods of making the solid electrolyte include combining a phenylsilane and a first acid to yield mixture including benzene and a second acid, and combining at least one of an alkali halide, and alkali amide, and an alkali alkoxide with the second acid to yield a product d represented by general formula Li.sub.ySiR.sub.x(MO.sub.4).sub.y. The second acid may be in the form of a liquid or a solid. The phenylsilane includes at least one C1-C3 alkyl substituent or at least one C1-C3 alkoxy substituent, and the first acid includes at least one of sulfuric acid, selenic acid, and telluric acid.

The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The positive electrode includes a positive electrode collector with a thermal conductive rate of 65 W/(m.Math.K) to 150 W/(m.Math.K). The negative electrode includes a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.

The present disclosure relates to a secondary battery module including a nonaqueous electrolyte secondary battery and an elastic body. The elastic body has a compressive elastic modulus of 5 MPa to 120 MPa. The positive electrode includes a positive electrode collector with a thermal conductive rate of 65 W/(m.Math.K) to 150 W/(m.Math.K). The negative electrode includes a negative electrode active material layer including a first layer and a second layer sequentially formed from a side with the negative electrode collector. The first layer contains first carbon-based active material particles with a 10% proof stress of 3 MPa or less. The second layer contains second carbon-based active material particles with a 10% proof stress of 5 MPa or greater.

Disclosed is a polymer electrolyte composition comprising a polymer having a structural unit represented by the following formula (1), at least one electrolyte salt selected from the group consisting of lithium salts, sodium salts, magnesium salts, and calcium salts, and an inorganic oxide including a lithium element, a lanthanum element, and a zirconium element, wherein, when the molar number of the lanthanum element contained in the inorganic oxide is set to M(La) and the molar number of the zirconium element contained in the inorganic oxide is set to M(Zr), M(La) and M(Zr) satisfy the following expression (2):

##STR00001## wherein X.sup.− represents a counter anion; and

0.4≤M(Zr)/M(La)≤0.8  (2).

The present disclosure relates to solid-state electrolytes and methods of making the same. The method includes admixing a sulfate precursor including one or more of Li.sub.2SO.sub.4 and Li.sub.2SO.sub.4.H.sub.2O with one or more carbonaceous capacitor materials. The first admixture is calcined to form an electrolyte precursor that is admixed with one or more additional components to form the solid-state electrolyte. When a ratio of the sulfate precursor to the one or more carbonaceous capacitor materials in the first admixture is about 1:2, the electrolyte precursor consists essentially of Li.sub.2S. When a ratio of the sulfate precursor to the one or more carbonaceous capacitor materials in the first admixture is less than about 1:2, the electrolyte precursor is a composite precursor including a solid-state capacitor cluster including the one or more carbonaceous capacitor materials and a sulfide coating including Li.sub.2S disposed on one or more exposed surfaces of the solid-state capacitor cluster.

One aspect of the present invention provides a nonaqueous electrolyte secondary battery including a sulfur-containing positive electrode, a negative electrode, a cation exchange resin layer interposed between the positive electrode and the negative electrode, a positive electrode electrolyte, and a negative electrode electrolyte. The positive electrode electrolyte contains lithium polysulfide, and a sulfur equivalent concentration of the positive electrode electrolyte is higher than the sulfur equivalent concentration of the negative electrode electrolyte. Another aspect of the present invention provides a nonaqueous electrolyte secondary battery including a sulfur-containing positive electrode, a negative electrode, a cation exchange resin layer interposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. At least one of the positive electrode and the negative electrode includes a cation exchange resin, and a concentration of an anion contained in the nonaqueous electrolyte is 0.7 mol/l or less.

One aspect of the present invention provides a nonaqueous electrolyte secondary battery including a sulfur-containing positive electrode, a negative electrode, a cation exchange resin layer interposed between the positive electrode and the negative electrode, a positive electrode electrolyte, and a negative electrode electrolyte. The positive electrode electrolyte contains lithium polysulfide, and a sulfur equivalent concentration of the positive electrode electrolyte is higher than the sulfur equivalent concentration of the negative electrode electrolyte. Another aspect of the present invention provides a nonaqueous electrolyte secondary battery including a sulfur-containing positive electrode, a negative electrode, a cation exchange resin layer interposed between the positive electrode and the negative electrode, and a nonaqueous electrolyte. At least one of the positive electrode and the negative electrode includes a cation exchange resin, and a concentration of an anion contained in the nonaqueous electrolyte is 0.7 mol/l or less.

Set forth herein are garnet material compositions, e.g., lithium-stuffed garnets and lithium-stuffed garnets doped with alumina, which are suitable for use as electrolytes and catholytes in solid state battery applications. Also set forth herein are lithium-stuffed garnet thin films having fine grains therein. Disclosed herein are novel and inventive methods of making and using lithium-stuffed garnets as catholytes, electrolytes and/or anolytes for all solid state lithium rechargeable batteries. Also disclosed herein are novel electrochemical devices which incorporate these garnet catholytes, electrolytes and/or anolytes. Also set forth herein are methods for preparing novel structures, including dense thin (<50 um) free standing membranes of an ionically conducting material for use as a catholyte, electrolyte, and, or, anolyte, in an electrochemical device, a battery component (positive or negative electrode materials), or a complete solid state electrochemical energy storage device. Also, the methods set forth herein disclose novel sintering techniques, e.g., for heating and/or field assisted (FAST) sintering, for solid state energy storage devices and the components thereof.

Set forth herein are garnet material compositions, e.g., lithium-stuffed garnets and lithium-stuffed garnets doped with alumina, which are suitable for use as electrolytes and catholytes in solid state battery applications. Also set forth herein are lithium-stuffed garnet thin films having fine grains therein. Disclosed herein are novel and inventive methods of making and using lithium-stuffed garnets as catholytes, electrolytes and/or anolytes for all solid state lithium rechargeable batteries. Also disclosed herein are novel electrochemical devices which incorporate these garnet catholytes, electrolytes and/or anolytes. Also set forth herein are methods for preparing novel structures, including dense thin (<50 um) free standing membranes of an ionically conducting material for use as a catholyte, electrolyte, and, or, anolyte, in an electrochemical device, a battery component (positive or negative electrode materials), or a complete solid state electrochemical energy storage device. Also, the methods set forth herein disclose novel sintering techniques, e.g., for heating and/or field assisted (FAST) sintering, for solid state energy storage devices and the components thereof.