The present technology is directed to a potassium metal battery, particularly a potassium metal secondary battery, that includes a cathode; an anode that includes potassium metal; and a non-aqueous electrolyte that includes a potassium salt as well as a solvent. The solvent may include dimethoxyethane, digylme, triglyme, tetraglyme, or a mixture of any two or more thereof.

An electrode material for a lithium ion secondary battery of the present invention is an electrode material for a lithium ion secondary battery including an electrode active material and a carbonaceous film that coats a surface of the electrode active material, in which a hydroxy group and a group which is at least one selected from a carboxyl group, a nitro group, and a sulfo group have been introduced to an outermost surface of the carbonaceous film, a ratio of a total count number of the group which is at least one selected from the carboxyl group, the nitro group, and the sulfo group to a count number of the hydroxy group is 0.001 or more and 10.000 or less when a surface of the carbonaceous film is analyzed through time-of-flight secondary ion mass spectrometry to obtain the ratio, a coating ratio of the carbonaceous film is set to 40% or more and 90% or less, and the carbonaceous film has at least one through-hole per 100 square nanometers.

An electrode material for a lithium ion secondary battery of the present invention is an electrode material for a lithium ion secondary battery including an electrode active material and a carbonaceous film that coats a surface of the electrode active material, in which a hydroxy group and a group which is at least one selected from a carboxyl group, a nitro group, and a sulfo group have been introduced to an outermost surface of the carbonaceous film, a ratio of a total count number of the group which is at least one selected from the carboxyl group, the nitro group, and the sulfo group to a count number of the hydroxy group is 0.001 or more and 10.000 or less when a surface of the carbonaceous film is analyzed through time-of-flight secondary ion mass spectrometry to obtain the ratio, a coating ratio of the carbonaceous film is set to 40% or more and 90% or less, and the carbonaceous film has at least one through-hole per 100 square nanometers.

Provided is a method for producing a negative electrode for an electric storage device, the method comprising the steps of preparing a negative electrode composition comprising a negative electrode active material that reversibly carries a sodium ion, metal sodium, and a liquid dispersion medium for dispersing them; allowing a negative electrode current collector to hold the negative electrode composition; evaporating at least part of the liquid dispersion medium from the negative electrode composition held by the negative electrode current collector, thereby giving a negative electrode precursor comprising the negative electrode active material, the metal sodium, and the negative electrode current collector; and bringing the negative electrode precursor into contact with an electrolyte having sodium ion conductivity, thereby doping the negative electrode active material with sodium eluted from the metal sodium.

Provided is a method for producing a negative electrode for an electric storage device, the method comprising the steps of preparing a negative electrode composition comprising a negative electrode active material that reversibly carries a sodium ion, metal sodium, and a liquid dispersion medium for dispersing them; allowing a negative electrode current collector to hold the negative electrode composition; evaporating at least part of the liquid dispersion medium from the negative electrode composition held by the negative electrode current collector, thereby giving a negative electrode precursor comprising the negative electrode active material, the metal sodium, and the negative electrode current collector; and bringing the negative electrode precursor into contact with an electrolyte having sodium ion conductivity, thereby doping the negative electrode active material with sodium eluted from the metal sodium.

The disclosure provides a method comprising inducing a first current between a source of a countercharge and a first electrode, the first current being through an electrolyte. A second current is induced across the first electrode, the second current being transverse to the first current, and the second current inducing a relativistic charge across the first electrode.

The disclosure provides a method comprising inducing a first current between a source of a countercharge and a first electrode, the first current being through an electrolyte. A second current is induced across the first electrode, the second current being transverse to the first current, and the second current inducing a relativistic charge across the first electrode.

Soft solid state electrolyte compositions for secondary electrochemical cell are composed of a metal salt dispersed or doped in a soft solid matrix. The matrix includes an organic cation and a boron cluster anion. The metal salt has a metal cation and an anion. Compared with competing solid electrolytes, the disclosed electrolyte compositions are soft, allowing for lower molding pressures and showing high ionic conductivity.

Soft solid state electrolyte compositions for secondary electrochemical cell are composed of a metal salt dispersed or doped in a soft solid matrix. The matrix includes an organic cation and a boron cluster anion. The metal salt has a metal cation and an anion. Compared with competing solid electrolytes, the disclosed electrolyte compositions are soft, allowing for lower molding pressures and showing high ionic conductivity.

Soft solid-state electrolyte compositions for secondary electrochemical cell include a metal salt dispersed or doped in a soft solid matrix. Methods for synthesizing the compositions include doping a solid matrix with a metal salt. The matrix includes an organic cation and a first boron cluster anion. Methods for optimizing the electrolytes include construction of electrolyte libraries and screening of the libraries for a desired property.