Seiko Epson Corporation

Tomofumi Yokoyama

Hitoshi Yamamoto

Tsutomu Teraoka

Naoyuki Toyoda

Hirofumi Hokari

Sukenori Ichikawa

Tomoyuki Okuyama

A precursor solution of a garnet-type solid electrolyte is provided that is represented by the following compositional formula, and contains one type of solvent, and a lithium compound, a lanthanum compound, a zirconium compound, a gallium compound, and a neodymium compound, each of which has solubility in the solvent, wherein with respect to the stoichiometric composition of the following compositional formula, the amount of the lithium compound is 1.05 times or more and 1.30 times or less, and the amounts of the lanthanum compound, the zirconium compound, the gallium compound, and the neodymium compound are equal,(LiGa)(LaNd)ZrOprovided that the following relationships are satisfied: 0.1≤x≤1.0 and 0.0<y≤0.2.

Precursor solution of garnet-type solid electrolyte, method for producing precursor solution of garnet-type solid electrolyte, and garnet-type solid electrolyte

A solid electrolyte according to the present disclosure is represented by the following compositional formula (1).LiLa(ZrWM)O  (1) In the formula (1), x and z satisfy 0.10≤x≤0.60 and 0.00<z≤0.25, and M is at least one type of element selected from the group consisting of Nb, Ta, and Sb.

Solid electrolyte, method for producing solid electrolyte, and composite body

A positive electrode active material composite body according to the present disclosure includes a positive electrode active material containing a transition metal element and having a particulate shape, and an ion conductor provided in contact with a surface of the positive electrode active material, wherein the ion conductor is constituted by a material containing Li, Zr, and M which is at least one type of element selected from the group consisting of Nb, Sb, and Ta, the transition metal element is partially diffused in the ion conductor, and an average decrease ratio of a content ratio of the transition metal element until a point where the content ratio of the transition metal element in the ion conductor to be determined by a characteristic X-ray has reached 12% of the content ratio of the transition metal element at an interface between the positive electrode active material and the ion conductor based on a substance amount is 0.5% or more and 6.1% or less per 1 nm thickness from the interface.

Positive electrode active material composite body

The solid electrolyte according to an embodiment of the present disclosure is represented by the following formula (1):LiLa(ZrGeM)O  (1)

Solid electrolyte, method for producing solid electrolyte, and composite

A solid electrolyte represented by the following formula (1): Li(LaBa)(ZrM)O(1), wherein 0.20≤x<1.50, 0.00<y<0.30, and M is two or more elements selected from the group consisting of Nb, Ta, and Sb.

An electrolyte precursor solution includes a metallic compound containing elements constituting an electrolyte, a solvent capable of dissolving the metallic compound, and an anionic surfactant having a sulfate group (SO) bonded to a hydrophobic group R. By reacting such an electrolyte precursor solution with active material particles containing lithium, lithium sulfate derived from the anionic surfactant is interposed at the interface between the surface of the active material particle and the electrolyte so as to enhance the dissociation of lithium ions at the interface, and thus, an excellent ion conductivity can be realized.

Electrolyte precursor solution, electrode assembly, battery, and electronic apparatus

A solid electrolyte according to the present disclosure is represented by the following compositional formula (1).Li(LaY)(ZrM)O&#x2003;&#x2003;(1) In the formula (1), x and z satisfy 0.00&#x3c;x&#x3c;1.10, and 0.00&#x3c;z&#x2264;0.15, and M is two or more types of elements selected from the group consisting of Nb, Ta, and Sb.

A method for producing a solid composition according to the present disclosure is a method for producing a solid composition that is used for forming a functional ceramic having a first crystal phase. The method for producing a solid composition includes: producing an oxide composed of a second crystal phase different from the first crystal phase; and mixing the oxide and an oxo acid compound.

Method for producing solid composition and method for producing functional ceramic

The solid electrolyte according to an embodiment of the present disclosure is represented by the following formula (1):LiLa(ZrInM)O&#x2003;&#x2003;(1)

A solid electrolyte according to the present disclosure is represented by the following compositional formula (1).Li(LaBi)ZrO&#x2003;&#x2003;(1) In the formula (1), x satisfies 0.05&#x3c;x&#x3c;0.40.

A solid electrolyte according to the present disclosure is represented by the following compositional formula (1).Li(LaSr)(ZrM)O&#x2003;&#x2003;(1) In the formula (1), x and y satisfy 0.20&#x2264;x&#x3c;1.50 and 0.00&#x3c;y&#x3c;0.30, and M is two or more types of elements selected from the group consisting of Nb, Ta, and Sb.

A solid composition according to the present disclosure is a solid composition to be used for forming a functional ceramic having a crystal phase, and contains an oxide constituted by a crystal phase different from the crystal phase of the functional ceramic at normal temperature and normal pressure, and an oxoacid compound. The oxoacid compound preferably contains at least one of a nitrate ion and a sulfate ion as an oxoanion. Further, the oxide preferably has a crystal grain size of 10 nm or more and 200 nm or less.

Solid composition and production method for functional ceramic

A composition for forming a lithium reduction resistant layer includes a solvent, and a lithium compound, a lanthanum compound, a zirconium compound, and a compound containing a metal M, each of which shows solubility in the solvent, and in which with respect to the stoichiometric composition of a compound represented by the general formula (I), the lithium compound is contained in an amount 1.05 times or more and 2.50 times or less, the lanthanum compound and the zirconium compound are contained in an amount 0.70 times or more and 1.00 times or less, and the compound containing a metal M is contained in an equal amount.LiLa(Zr,M)O&#x2003;&#x2003;(I)

Composition for forming lithium reduction resistant layer, method for forming lithium reduction resistant layer, and lithium secondary battery

A secondary battery according to the present disclosure includes a solid electrolyte portion containing a lithium composite metal oxide represented by the following compositional formula (1), and current collectors disposed opposite to each other through the solid electrolyte portion:LiLaZrMaMbO&#x2003;&#x2003;(1)

Secondary battery, method for producing secondary battery, and electronic apparatus

A lithium battery as a secondary battery includes a positive electrode composite material containing a solid electrolyte and a positive electrode active material containing lithium, a negative electrode as an electrode provided at one face of the positive electrode composite material, and a current collector provided at another face of the positive electrode composite material, wherein the solid electrolyte is a garnet-type fluorine-containing lithium composite metal oxide that is represented by the following compositional formula (1) or (2) and that conducts lithium.(LiGa)(LaNd)ZrOF&#x2003;&#x2003;(1)(LiGa)(LaCa)ZrOF&#x2003;&#x2003;(2) Provided that 0.1&#x2264;x&#x2264;1.0, 0&#x3c;y&#x2264;0.2, and 0&#x3c;z&#x2264;1.0.

Growing community of inventors

Matsumoto, Japan

Tomofumi Yokoyama