Active material, method for manufacturing active material, electrode, and lithium ion secondary battery

Patent metadata

Field	Value
Publication number	US-10230108-B2
Application number	US-201214005368-A
Country	US
Kind code	B2
Filing date	Mar 30, 2012
Priority date	Mar 31, 2011
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

An active material capable of improving the discharge capacity of a lithium ion secondary battery is provided. The active material of the present invention includes LiVOPO4 and one or more metal elements selected from the group consisting of Al, Nb, Ag, Mg, Mn, Fe, Zr, Na, K, B, Cr, Co, Ni, Cu, Zn, Si, Be, Ti, and Mo.

First claim

The invention claimed is:

1. An active material comprising:
LiVOPO 4 crystal particles containing within the particles and on surfaces of the particle one or more elements M selected from the group consisting of Al, Nb, Mg, Na, K, and Si, wherein
the metal element is present as a metal salt or a metal oxide.

2. An electrode comprising:
a current collector; and
an active material layer stacked on the current collector,
wherein the active material layer contains the active material according to claim 1 and a conductive auxiliary agent.

3. A lithium ion secondary battery comprising the electrode according to claim 2 .

4. The active material according to claim 1 , wherein a ratio of M moles to V moles contained in the active material is approximately in the range of 0.01 to 0.15.

5. The active material according to claim 4 , wherein the range is 0.02 to 0.08.

6. The active material according to claim 1 , obtained by a process including a hydrothermal synthesis step of heating a mixture at a temperature of approximately 100 to 200° C. under pressure, the mixture including: one or more elements M selected from the group consisting of Al, Nb, Mg, Na, K, and Si; a lithium source; a phosphate source; a vanadium source; and water.

7. The active material according to claim 6 , wherein in the hydrothermal synthesis step, the ratio of the total number of moles of M contained in the mixture to the number of moles of V is adjusted to be in the range of 0.01 to 0.15, and wherein the ratio is approximately equal to the ratio of M moles to V moles contained in the active material.

8. The active material according to claim 7 , wherein the range is 0.02 to 0.08.

9. The active material according to claim 6 , wherein a thermal treatment step is carried out after the hydrothermal synthesis step in which the mixture is heated at 400 to 700° C.

10. The active material according to claim 1 , wherein the metal element is present as a metal salt selected from the group consisting of a hydroxide, a carbonate, a sulfate, a chloride, and a phosphide.

11. The active material according to claim 1 , wherein the metal element is present as a metal oxide selected from the group consisting of NaOH, KOH, Al 2 O 3 , Nb 2 O 5 , MgO, and SiO 2 .

12. The active material according to claim 1 , wherein M comprises Al.

13. The active material according to claim 1 , wherein M comprises Nb.

14. The active material according to claim 1 , wherein M comprises Mg.

15. The active material according to claim 1 , wherein M comprises Na.

16. The active material according to claim 1 , wherein M comprises K.

17. The active material according to claim 1 , wherein M comprises Si.

Assignees

• Sano Atsushi
• Otsuki Keitaro
• Kato Tomohiko
• Higuchi Akiji
• Tdk Corp

Inventors

• Sano Atsushi
• Otsuki Keitaro
• Kato Tomohiko
• Higuchi Akiji

Classifications

• H01M4/136

  Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy · CPC title

• H01M4/5825 Primary

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title

• C01B25/45

  containing plural metal, or metal and ammonium · CPC title

• H01M10/0525

  Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title