High rate capability of reduced Graphene oxide for lithium-ion batteries

High rate capability of reduced graphene oxide for lithium ion batteries

Goals :


Produce fonctional rGO half-cells


Produce fonctional rGO - LC full-cells


Produce fonctional rGO - MOD LC full-cells

Previous process (Graphite anode sheets)

          7:2:1          Graphite/Acethylen Black/PVDF


3*10min Ball-milling of Graphite+AB powder
Add 0,3cc NMP

Use small Jet-mill (2*20s)

Add KF Polymer (PVDF)

Use small Jet-mill (2*20s)

Expand the paste on a clean copper foil with the Doctor Blade method

1/2 days vacuum drying

30/40 min oven drying at 120°C

Punching & Assembling

First issue : Particle size

Problem : rGO paste could not be expanded, the paste remains stuck on the Doctor blade

In order to reduce rGO particle size : 5*3min mixing in a sol-mix/

De-ionized Water solution

Second issue : Solvant and PVDF Amount

Graphite density ~2.21


rGO density ~1.93

For the same weight, there will be a bigger volume of rGO.


If the particle size is the same, it means more interstitial volume

Solution : 

Add more PVDF to fill the extra interstitial volume

Third issue : Drying time and conditions

Using softer drying conditions improved the rolling process

Optimized Process for rGO Anode sheets

    63 : 19 : 18                   rGO/Acethylen Black/PVDF

Dissolve rGO+AB into 50%sol-mix/50% De-ionized Water (200mL)

Use ultrasonic waves for 5 minutes to obtain good dispersion

Mix 5*3min

Filter the solution to obtain rGO+AB powder

Vacuum dry the powder for 2h at 50°C

3*10min Ball-milling for the rGO+AB powder

Add 1,3cc NMP

Use small Jet-mill (2*20s)

Add KF Polymer (PVDF)

Use small Jet-mill (2*20s) again

Expand quickly the paste obtained on a clean copper foil with the Doctor Blade method

2/3 days vacuum drying

40/50 min vacuum oven drying at 50°C

Testing conditions

Capacity results (Discharge)

Capacity results (Charge)

Highrate comparison

Explanation at high rate 

Left to do

Test rGO Half Cells with 1C = 372mA/g


 Test rGO-LC full cells


 Test rGO-MOD LC full cells


Compare performance


 Get SEM pictures of rGO before and after lowering particle size

Thank you for your attention

Create a presentation like this one
Share it on social medias
Share it on your own
Share it on social medias
Share it on your own

How to export your presentation

Please use Google Chrome to obtain the best export results.


How to export your presentation

Japan Internship 2016

by valbarberichaud

10 views

Public - 7/6/16, 4:01 AM