Granted Patent B2

US 12,244,005 · App. 17/738,841 · Granted Mar 4, 2025

Inventors: Vedran Glavas (Wolfsburg, DE); Julian Koopmann (Braunschweig, DE); Jonathan Mueller (Gifhorn, DE); Stéphane Brice Olouou Guifo (Wolfsburg, DE); Julian Wegener (Wolfsburg, DE); Marco Wiethop (Wolfenbüttel, DE)

Assignee: VOLKSWAGEN AKTIENGESELLSCHAFT

H01M4/366H01M4/382H01M2004/021H01M2004/028H01M4/505H01M4/525

Abstract

Claims (27)

1. A secondary particle for a cathode of a secondary lithium battery cell, comprising

a plurality of primary particles, whereby each of the primary particles has a layered crystalline structure in which transition metal oxide layers and lithium layers alternate,

wherein each of the primary particles has an extension in the direction of its crystallographic c-axis that is greater than in a direction perpendicular to the crystallographic c-axis.

2. The secondary particle according to claim 1 , wherein the spatial extension of the primary particles in the direction of the crystallographic c-axis is at least 1.2 times the extension of the primary particle in the direction perpendicular to the crystallographic c-axis.

3. The secondary particle according to claim 2 , wherein the spatial extension of the primary particles in the direction of the crystallographic c-axis is at least two times the extension of the primary particle in the direction perpendicular to the crystallographic c-axis.

4. The secondary particle according to claim 1 , wherein the crystallographic c-axis is parallel to a major direction of extension of the appertaining primary particle.

5. The secondary particle according to claim 1 , wherein the primary particles are morphologically radially oriented.

6. The secondary particle according to claim 1 , wherein each of the primary particles has a spatial extension between 50 nm and 5 μm.

7. A cathode for a secondary lithium battery cell, comprising a secondary particle that is configured according to claim 1 .

8. A secondary lithium battery cell having a cathode according to claim 7 .

9. A method for producing a secondary particle according to claim 1 , comprising:

providing an aqueous solution of a transition metal salt,

in order to form crystallization nuclei from a transition metal compound, carrying out a precipitation reaction by adding a base to the aqueous solution,

doping the crystallization nuclei that have resulted from the precipitation reaction with monovalent cations,

carrying out another precipitation reaction, thus forming precursor particles from the doped crystallization nuclei, and

calcinating the precursor particles.

10. The method for producing a secondary particle according to claim 1 , comprising:

providing an aqueous solution of a transition metal salt,

in order to form crystallization nuclei from a transition metal compound, carrying out a precipitation reaction by adding a base to the aqueous solution,

coating the crystallization nuclei that have resulted from the precipitation reaction,

carrying out another precipitation reaction, thus forming precursor particles from the coated crystallization nuclei, and

calcinating the precursor particles.

11. The method for producing a secondary particle according to claim 1 , comprising:

providing an aqueous solution of a transition metal salt,

in order to form crystallization nuclei from a transition metal compound, carrying out a precipitation reaction by adding a base to the aqueous solution,

orienting the crystallization nuclei that have resulted from the precipitation reaction relative to each other by means of uniaxial compression and sintering the crystallization nuclei, thus forming precursor particles, and

calcinating the precursor particles.

Assignments (2)

Priority Claims (1)

Continuity (1)

References Cited (11)