Method of negative electrode pre-lithiation for lithium-ion capacitors

Patent metadata

Field	Value
Publication number	US-11211205-B2
Application number	US-202016989622-A
Country	US
Kind code	B2
Filing date	Aug 10, 2020
Priority date	Apr 18, 2016
Publication date	Dec 28, 2021
Grant date	Dec 28, 2021

Abstract

The present invention is directed to a method for pre-lithiation of negative electrodes during lithium loaded electrode manufacturing for use in lithium-ion capacitors. There is provided a system and method of manufacture of LIC electrodes using thin lithium film having holes therein, and in particular, to the process of manufacturing lithium loaded negative electrodes for lithium-ion capacitors by pre-lithiating electrodes with thin lithium metal films, wherein the thin lithium metal films include holes therein, and the lithium loaded negative electrodes are manufactured using a roll-to-roll lamination manufacturing, process.

First claim

We claim:

1. A method of making a pre-lithiated negative electrode for lithium-ion capacitors having a lithium loading weight, comprising the steps of:
providing an elemental lithium metal thin film layer;
forming a plurality of holes in the thin lithium film layer according to the lithium loading weight;
providing a negative electrode material comprising at least one selected from the group consisting of hard carbon, soft carbon and graphite;
positioning the elemental lithium thin film layer next to the negative electrode material and pressing the elemental lithium metal film layer into the negative electrode material;
wherein the pre-lithiated negative electrode constructed using lithium film having holes therein, is manufactured in a roll-to-roll process.

2. The method of claim 1 , wherein the width range of said negative electrode is from 2 mm to about 300 mm.

3. The method of claim 1 , wherein the thickness range of said negative electrode is from 20 μm to about 400 μm.

4. The method of claim 1 , wherein the width range of said lithium films is from 2 mm to 300 mm.

5. The method of claim 4 , wherein the lithium loaded negative electrode is combined with a positive electrode and a separator in a combining step to form a cell, and electrolyte is added to the cell after the combining step.

6. The method of claim 4 , wherein the area of the loaded thin Li film having holes is from 25% to 100% of the area of the negative electrode.

7. The method of claim 1 , wherein the thickness range of said lithium films is from 2 μm to 50 μm.

8. The method of claim 7 , wherein the mass ratio of the Li loading weight to the negative electrode active layer weight is from 3% to 20%.

9. The method of claim 1 , wherein the area size percentage range of said holes in lithium films is from 0.01% to 75%.

10. The method of claim 1 , comprising a top lithium film layer and a bottom lithium film layer, and positioning the top and bottom elemental lithium thin film layers on opposing sides of the negative electrode material and pressing the first and second elemental lithium metal film layers into the negative electrode material.

11. The method of claim 10 , wherein the locations of the top lithium film layer and the bottom lithium film layer are the same on each side of negative electrode material.

12. The method of claim 1 , further comprising the step of attaching the elemental lithium thin film layer having holes therein and the electrode material to a copper metal foil current collector.

Assignees

• Univ Florida State Res Found
• General Capacitor Llc
• Univ Florida State Res Found Inc

Inventors

• Cao Wanjun
• Zheng Jian-Ping

Classifications

• H01G11/06

  with one of the electrodes allowing ions to be reversibly doped thereinto, e.g. lithium ion capacitors [LIC] · CPC title

• H01G11/86

  specially adapted for electrodes (carbonisation or activation of carbon for the manufacture of electrodes H01G11/34) · CPC title

• H01G11/50 Primary

  specially adapted for lithium-ion capacitors, e.g. for lithium-doping or for intercalation · CPC title

• H01G11/14

  Arrangements or processes for adjusting or protecting hybrid or EDL capacitors (emergency protective circuit arrangements specially adapted for capacitors, and effecting automatic switching in the event of an undesired change from normal working conditions H02H7/16; emergency protective circuit arrangements for limiting excess current or voltages without disconnection H02H9/00) · CPC title

• Y02E60/13

  Energy storage using capacitors · CPC title