Electrochemically modified carbon material for lithium-ion battery

Patent metadata

Field	Value
Publication number	US-2017288224-A1
Application number	US-201415506813-A
Country	US
Kind code	A1
Filing date	Aug 29, 2014
Priority date	Aug 29, 2014
Publication date	Oct 5, 2017
Grant date	—

Abstract

The present invention provides an anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 μm to 30 μm, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle.

First claim

1 . An anode material for a lithium-ion battery comprising a carbon particle having a particle size of 5 μm to 30 μm, and including defective portions on a surface of the carbon particle, the defective portions being holes or pores formed by anodic oxidation of the carbon particle.

2 . The anode material according to claim 1 , wherein the size of holes or pores is distributed between 500 nm and 1 μm.

3 . The anode material according to claim 1 , wherein the carbon particle includes a layer of graphenes having an interlayer space larger than 0.335 nm.

4 . The anode material according to claim 1 , wherein the carbon particle has been subjected to heat treatment after the anodic oxidation.

5 . The anode material according to claim 2 , wherein a density of the defective portions is 2 to 3 portions per μm 2 .

6 . The anode material according to claim 1 , further comprising anode active particles which are capable of absorbing and desorbing lithium ions.

7 . The anode material according to claim 6 , wherein the anode active particles are metal or semi-metal particles or compound particles of at least one element selected from a group consisting of Si, Sn, Al, Ge and Pb.

8 . The anode material according to claim 6 , wherein the anode active particles adhere on the carbon particle.

9 . The anode material according to claim 8 , wherein the carbon particle and the anode active particles are composited with amorphous carbon layer.

10 . A method for preparing an anode material comprising:
soaking carbon particles having a particle size of 5 μm to 30 μm into an electrolytic solution; anodically oxidizing the carbon particles to form defective portions on surfaces of the carbon particles; and collecting the carbon particles after the anodically oxidizing.

11 . The method according to claim 10 , wherein the electrolytic solution contains an inorganic or organic acid.

12 . The method according to claim 10 , further comprising heat treating the collected carbon particles under inert atmosphere.

13 . A lithium ion battery comprising the anode material according to claim 1 .

14 . A lithium ion battery comprising the anode material according to claim 2 .

15 . A lithium ion battery comprising the anode material according to claim 3 .

16 . A lithium ion battery comprising the anode material according to claim 4 .

17 . A lithium ion battery comprising the anode material according to claim 5 .

18 . A lithium ion battery comprising the anode material according to claim 6 .

19 . A lithium ion battery comprising the anode material according to claim 7 .

20 . A lithium ion battery comprising the anode material according to claim 8 .

21 . A lithium ion battery comprising the anode material according to claim 9 .

Assignees

• Nec Corp

Inventors

• Cheng Qian
• Tamura Noriyuki
• Nakahara Kentaro

Classifications

• H01M4/1393

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

• H01M10/0525

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

• H01M4/364

  as mixtures · CPC title

• H01M4/133

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

• H01M2004/027

  Negative electrodes · CPC title