Anodes comprising germanium for lithium-ion devices

Patent metadata

Field	Value
Publication number	US-9472804-B2
Application number	US-201514926012-A
Country	US
Kind code	B2
Filing date	Oct 29, 2015
Priority date	Nov 18, 2014
Publication date	Oct 18, 2016
Grant date	Oct 18, 2016

Abstract

An anode material for a lithium ion device includes an active material including germanium and boron. The weight percentage of the germanium is between about 45 to 80 weight % of the total weight of the anode material and the weight percentage of the boron is between about 2 to 20 weight % of the total weight of the anode material. The active material may include carbon at a weight percentage of between 0.5 to about 5 weight % of the total weight of the anode material. Additional materials, methods of making and devices are taught.

First claim

The invention claimed is:

1. An anode material for a lithium ion device, comprising:
an active material comprising germanium nano-particles having a particle size of 20 to 100 nm, boron carbide nano-particles having a particle size of 20 to 100 nm and tungsten carbide nano-particles having a particle size of 20 to 60 nm, wherein the weight percentage of the germanium is between 5 to 80 weight % of the total weight of the anode material, the weight percentage of boron in the anode material is between 2 to 20 weight % of the total weight of the anode material and the weight percentage of tungsten in the anode material is between 5 to 20 weight % of the total weight of the anode material.

2. The anode material of claim 1 , wherein the active material further comprises carbon at a weight percentage of between 0.5 to 5 weight % of the total weight of the anode material.

3. The anode material of claim 1 , wherein the active material further comprises silicon and a weight ratio of germanium to silicon in the active material is at least 4 to 1.

4. The anode material of claim 1 , wherein the weight percentage of the germanium is between 60 to 75 weight % of the total weight of the anode material and the weight percentage of the boron in the anode material is between 3 to 6 weight % of the total weight of the anode material.

5. The anode material of claim 1 , wherein the weight percentage of the tungsten in the anode material is between 7 to 11 weight % of the total weight of the anode material.

6. The anode material of claim 1 , further comprising:
one or more conductive materials, wherein the weight percentage of the conductive materials is between 0.01 to 5 weight % of the total weight of the anode material.

7. The anode material of claim 1 , further comprising:
a binder at a weight percentage of between 0.1 to 10 weight % of the total weight of the anode material.

Assignees

• Storedot Ltd

Inventors

• Burshtain Doron
• Costi Ronny
• Ophir Carmit
• Aronov Daniel

Classifications

• H01M50/417

  Polyolefins · CPC title

• H01M4/133

  Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/587

  for inserting or intercalating light metals · CPC title

• H01M10/0525

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