Composite anode material made of core-shell particles

Patent metadata

Field	Value
Publication number	US-10454101-B2
Application number	US-201715414655-A
Country	US
Kind code	B2
Filing date	Jan 25, 2017
Priority date	Jan 25, 2017
Publication date	Oct 22, 2019
Grant date	Oct 22, 2019

Abstract

Core-shell particles, composite anode material, anodes made therefrom, lithium ion cells and methods are provided, which enable production of fast charging lithium ion batteries. The composite anode material has core-shell particles which are configured to receive and release lithium ions at their cores and to have shells that are configured to allow for core expansion upon lithiation. The cores of the core-shell particles are connected to the respective shells by conductive material such as carbon fibers, which may form a network throughout the anode material and possibly interconnect cores of many core-shell particles to enhance the electrical conductivity of the anode. Ionic conductive material and possibly mechanical elements may be incorporated in the core-shell particles to enhance ionic conductivity and mechanical robustness toward expansion and contraction of the cores during lithiation and de-lithiation.

First claim

The invention claimed is:

1. Composite anode material comprising:
core-shell particles comprising cores configured to receive and release lithium ions and shells configured to allow for core expansion upon lithiation, and
electrically conductive material which interconnects the cores of the core-shell particles,
wherein the shells of the core-shell particles are made of LTO (lithium titanate oxide) embedded in a conductive polymer.

2. The composite anode material of claim 1 , wherein at least some of the electrically conductive material reaches a surface of an anode made of the composite anode material.

3. The composite anode material of claim 1 , wherein the core-shell particles further comprise ionic conductive material connecting the cores to the respective shells.

4. The composite anode material of claim 1 , wherein the cores are made of at least one of: Sn, Si, Ge, Pb, P, Sb, Bi, Al, Ga, Zn, Ag, Mg, As, In, Cd and Au, and/or mixtures and/or alloys thereof.

5. The composite anode material of claim 1 , wherein the shells further comprise a carbon coating.

6. An anode made of the composite anode material of claim 1 .

7. The anode of claim 6 , comprising in a range of 50-95 wt % of the core-shell particles, 1-40 wt % of the electrically conductive material and 1-40 wt % of binder material.

8. A lithium ion cell comprising the anode of claim 6 .

9. A method of making an anode for a lithium ion cell comprising:
providing composite anode material comprising core-shell particles configured to receive and release lithium ions at their cores and to allow for core expansion within their shells upon lithiation, and
interconnecting the cores of the core-shell particles by electrically conductive material,
wherein the shells of the core-shell particles are made of LTO (lithium titanate oxide) embedded in a conductive polymer.

Assignees

• Storedot Ltd

Inventors

• Jacob David
• Remizov Sergey
• Shadmi Nitzan
• FARRAN Hani
• Aronov Daniel

Classifications

• H01M4/387

  Tin or alloys based on tin · CPC title

• H01M4/386

  Silicon or alloys based on silicon · CPC title

• H01M2004/027

  Negative electrodes · CPC title

• H01M4/625

  Carbon or graphite · CPC title

• H01M4/366 Primary

  as layered products · CPC title