Composite anode for a galvanic cell and a galvanic cell

Patent metadata

Field	Value
Publication number	US-10665860-B2
Application number	US-201515505979-A
Country	US
Kind code	B2
Filing date	Aug 3, 2015
Priority date	Aug 25, 2014
Publication date	May 26, 2020
Grant date	May 26, 2020

Abstract

An anode for a galvanic cell is constructed from an anode material containing a main component, which releases lithium ions during a discharge process of the galvanic cell, and at least one additive. The at least one additive has an electrochemical potential which is higher with respect to elemental lithium than an electrochemical potential of the main component with respect to elemental lithium. The at least one additive has a charging capacity and a discharging capacity, and the charging capacity does not deviate from the discharging capacity by more than 10%.

First claim

The invention claimed is:

1. An anode for a galvanic cell, the anode comprising:
an anode material, containing:
a main component which releases lithium ions during a discharge process of the galvanic cell, and
at least one additive,

wherein the at least one additive has an electrochemical potential which is higher, compared with elemental lithium, than an electrochemical potential of the main component, compared with elemental lithium, the at least one additive has a charge capacity and a discharge capacity, and the charge capacity does not deviate from the discharge capacity by more than 10%, wherein the at least one additive contains a mixture of lithium titanate and nickel oxide.

2. The anode as claimed in claim 1 , wherein the at least one additive reacts electrochemically if a voltage between 0.8 volts and 2 volts, compared with elemental lithium, is present at the anode.

3. The anode as claimed in claim 1 , wherein the at least one additive has one of: a spinel structure, a spinel-like structure, and a halite structure.

4. The anode as claimed in claim 1 , wherein the lithium titanate is present as Li 7 Ti 5 O 12 if a voltage of less than 0.8 volts, compared with elemental lithium, is present at the anode.

5. The anode as claimed in claim 1 , wherein the main component contains carbon, silicon, tin, iron arsenide, lithium vanadium dioxide, metal alloys, or mixtures thereof.

6. The anode as claimed in claim 1 , wherein the anode material contains the at least one additive in an amount of more than 0% by weight and less than 50% by weight.

7. The anode as claimed in claim 1 , wherein the at least one additive is blended with the main component.

8. A galvanic cell, comprising:
an anode made of an anode material, the anode material containing:
a main component which releases lithium ions during a discharge process of the galvanic cell; and
at least one additive,

wherein the at least one additive has an electrochemical potential which is higher, compared with elemental lithium, than an electrochemical potential of the main component, compared with elemental lithium,
wherein the at least one additive has a charge capacity and a discharge capacity, and the charge capacity does not deviate from the charge capacity by more than 10%,
wherein the at least one additive contains a mixture of lithium titanate and nickel oxide, and
wherein the lithium titanate is present as Li 7 Ti 5 O 12 if a voltage of less than 0.8 volts, compared with elemental lithium, is present at the anode.

9. The galvanic cell as claimed in claim 8 , wherein the galvanic cell does not include an auxiliary electrode.

10. The galvanic cell as claimed in claim 8 , further comprising:
at least one cathode containing lithium-metal oxides, lithium-metal phosphates, or mixtures thereof.

Assignees

• Bosch Gmbh Robert

Inventors

• Wöhrle Thomas
• Wurm Calin Iulius
• Godbole Vikram Anil

Classifications

• H01M10/052

  Li-accumulators · CPC title

• H01M4/525

  of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M4/485 Primary

  of mixed oxides or hydroxides for inserting or intercalating light metals, e.g. LiTi2O4 or LiTi2OxFy (H01M4/505, H01M4/525 take precedence) · CPC title

• H01M4/364 Primary

  as mixtures · CPC title