This disclosure provides for Olivine-type compounds, their preparation and use in cathode materials for sodium-ion batteries. The olivine-type compounds of the invention are obtained by a direct synthesis embodying a hydrothermal method.

This disclosure provides for Olivine-type compounds, their preparation and use in cathode materials for sodium-ion batteries. The olivine-type compounds of the invention are obtained by a direct synthesis embodying a hydrothermal method.

An improved process for forming a lithium metal phosphate cathode material is provided. The process comprises reacting a metal source, a phosphate containing acid such as phosphoric acid, and an organic acid in solvent to form a metal phosphate. A lithium source is added to the solvent and a precipitate is allowed to form. The precipitate is dried and calcined thereby forming lithium iron phosphate cathode material wherein the lithium iron phosphate cathode material comprises up to 3 wt % carbon.

An improved process for forming a lithium metal phosphate cathode material is provided. The process comprises reacting a metal source, a phosphate containing acid such as phosphoric acid, and an organic acid in solvent to form a metal phosphate. A lithium source is added to the solvent and a precipitate is allowed to form. The precipitate is dried and calcined thereby forming lithium iron phosphate cathode material wherein the lithium iron phosphate cathode material comprises up to 3 wt % carbon.

The present invention aims to provide a lithium ion-conducting oxide capable of providing a solid electrolyte with an excellent ion conductivity, and a solid electrolyte, a sintered body, an electrode material or an electrode and an all-solid-state battery using the same. The lithium ion-conducting oxide of the present invention includes at least lithium, tantalum, phosphorus, silicon, and oxygen as constituent elements, has a peak in a region of −20.0 ppm to 0.0 ppm on the solid-state .sup.31P-NMR spectrum, and has a peak in a range of −80.0 ppm to −100.0 ppm on the solid-state .sup.29Si-NMR spectrum.

A composite cathode active material represented by Li.sub.x(Co.sub.1−wM1.sub.w).sub.yPO.sub.4 (Formula 1) having an olivine structure, wherein a unit-cell volume of the composite cathode active material is in a range of about 283 Å.sup.3 to about 284.6 Å.sup.3. A cathode including the composite cathode active material, and a secondary battery including the composite cathode active material are also disclosed.

In Formula 1, M1 includes i) at least one of Sc, Ti, V, Cr, Cu, or Zn, and optionally at least one of Fe or Ni, and 0.9≤x≤1.1, 0.9≤y≤1.1, and 0<w≤0.3.

A composite cathode active material represented by Li.sub.x(Co.sub.1−wM1.sub.w).sub.yPO.sub.4 (Formula 1) having an olivine structure, wherein a unit-cell volume of the composite cathode active material is in a range of about 283 Å.sup.3 to about 284.6 Å.sup.3. A cathode including the composite cathode active material, and a secondary battery including the composite cathode active material are also disclosed.

In Formula 1, M1 includes i) at least one of Sc, Ti, V, Cr, Cu, or Zn, and optionally at least one of Fe or Ni, and 0.9≤x≤1.1, 0.9≤y≤1.1, and 0<w≤0.3.

A method of making Cu—Ag.sub.3PO.sub.4 nanoparticles is provided. The method includes forming a mixture of at least one silver salt, at least one phosphate salt, and at least one copper (II) salt. The method further includes dissolving the mixture in water. The method further includes sonicating the mixture. The method further includes precipitating the Cu—Ag.sub.3PO.sub.4 nanoparticles or “nanoparticles”. The copper is present in the nanoparticles in an amount of 2 to 23 weight percent (wt.%) based on the total weight of the Cu—Ag.sub.3PO.sub.4. The nanoparticles of the present disclosure find application in treating cervical cancer, and colorectal cancer. The nanoparticles may also be used in photodegrading environmental pollutants.

A method of making Cu—Ag.sub.3PO.sub.4 nanoparticles is provided. The method includes forming a mixture of at least one silver salt, at least one phosphate salt, and at least one copper (II) salt. The method further includes dissolving the mixture in water. The method further includes sonicating the mixture. The method further includes precipitating the Cu—Ag.sub.3PO.sub.4 nanoparticles or “nanoparticles”. The copper is present in the nanoparticles in an amount of 2 to 23 weight percent (wt.%) based on the total weight of the Cu—Ag.sub.3PO.sub.4. The nanoparticles of the present disclosure find application in treating cervical cancer, and colorectal cancer. The nanoparticles may also be used in photodegrading environmental pollutants.

The present invention aims to provide a lithium-ion-conducting oxide sintered body capable of providing a solid electrolyte with an excellent ion conductivity, and a solid electrolyte, an electrode and an all-solid-state battery using the same. The lithium-ion-conducting oxide sintered body including at least lithium, tantalum, phosphorus, silicon, and oxygen as constituent elements, and having a polycrystalline structure consisting of crystal grains and grain interfaces formed between the crystal grains.