Delithiation of carbon free olivine by addition of carbon

Patent metadata

Field	Value
Publication number	US-2020024140-A1
Application number	US-201716465656-A
Country	US
Kind code	A1
Filing date	Dec 14, 2017
Priority date	Dec 15, 2016
Publication date	Jan 23, 2020
Grant date	—

Abstract

Here are described methods for the delithiation of carbon-free olivines, for instance, by the addition of an external carbon source in the presence of an oxidizing agent, e.g. a persulfate.

First claim

1 . A process for the delithiation of carbon-free olivine, comprising a step of contacting the carbon-free olivine with a source of carbon in the presence of an oxidizing agent to obtain a delithiated olivine.

2 . The process of claim 1 , wherein the carbon-free olivine is of the formula LiMPO 4 where M is Fe, Ni, Mn, Co, or a combination thereof.

3 . The process of claim 1 , wherein the carbon-free olivine is of the formula LiFe (1-x) M′ x PO 4 where M′ is Ni, Mn, Co, or a combination thereof, and wherein 0≤x<1.

4 . The process of claim 3 , wherein M′ is Mn, and wherein 0≤x<1.

5 . The process of claim 4 , wherein x is selected from the range of 0.1 to 0.9.

6 . The process of claim 3 , wherein x is 0.

7 . The process of claim 1 , wherein the oxidizing agent is a persulfate.

8 . The process of claim 7 , wherein the oxidizing agent is potassium or sodium persulfate.

9 . The process of claim 8 , wherein the oxidizing agent is sodium persulfate (Na 2 S 2 O 8 ).

10 . The process of claim 1 , wherein the source of carbon is selected from carbon black, acetylene black, Ketjen Black®, Denka™ black, Super P™ carbon, carbon fibers, carbon nanotubes, graphene, graphite, and any mixture thereof.

11 . The process of claim 1 , wherein the process is carried out in water or an aqueous solvent.

12 . The process of claim 1 , further comprising the addition of a surfactant.

13 . The process of claim 12 , wherein the surfactant is an alkylphenol ethoxylate surfactant.

14 . The process of claim 1 , wherein the weight ratio of carbon source to olivine is between 0.05% and 10%.

15 . A delithiated olivine prepared by a process according to claim 1 .

Assignees

• Hydro Quebec
• Cic Energigune

Inventors

• Galceran Mestres Montserrat
• Casas Cabanas Montserrat
• Guerfi Abdelbast
• Armand Michel
• Zaghib Karim

Classifications

• C01B25/45 Primary

  containing plural metal, or metal and ammonium · CPC title

• C01B25/00

  Phosphorus; Compounds thereof ({C01B6/00} , C01B21/00, C01B23/00 take precedence; perphosphates C01B15/16) · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title