Compositions for preparing expander free electrodes for lead acid battery and performance thereof

Patent metadata

Field	Value
Publication number	US-10468671-B2
Application number	US-201815919082-A
Country	US
Kind code	B2
Filing date	Mar 12, 2018
Priority date	May 17, 2017
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

The present invention deals with employing Heteroatoms namely Nitrogen, Sulphur intrinsic embedded carbon nanotubes (H-CNT) as multifunctional additive for preparing lead acid battery electrodes to substitute the expander chemicals namely, Vanisperse, Dinel Fibre, Barium sulphate and carbon black. Further the invention provides H-CNT in-situ produced from Crude oil or its products.

First claim

The invention claimed is:

1. An expander free electrode for lead acid battery comprising heteroatom embedded carbon nanotube (H-CNT) and lead oxide, wherein the heteroatom embedded carbon nanotube (H-CNT) comprises Sulphur in the range of 0.001 wt % to 1 wt % and wherein the electrode is having lead sulphate crystallite size in the range of 480 Å to 550 Å.

2. A lead acid battery comprising one or more electrodes as claimed in claim 1 .

3. An expander free electrode for lead acid battery comprising heteroatom embedded carbon nanotube (H-CNT) and lead oxide, wherein the electrode is having penetration in the range of 3 dmm to 7 dmm.

4. The electrode as claimed in claim 3 , wherein the heteroatom embedded carbon nanotube (H-CNT) comprises nitrogen in the range of 0.01 ppm to 2000 ppm.

5. A process for preparing an expander free electrode composition for lead acid battery, the process comprising:
a) adding water drop wise to lead oxide to obtain lead oxide-water paste;
b) dispersing the heteroatom embedded carbon nanotube (H-CNT) in sulphuric acid;
c) mixing the product as obtained in step (b) with lead oxide-water paste of step (a);
d) applying the product of step (c) in grid and curing for 72 hours to obtain expander free electrode for lead acid battery.

6. The process as claimed in claim 5 , wherein the dispersion is done by sonification.

7. The process as claimed in claim 5 , wherein the process is performed at a temperature in the range of 40° C. to 50° C.

8. The process as claimed in claim 5 , wherein the heteroatom embedded carbon nanotube (H-CNT) is produced from crude oil or its products or mixture thereof.

9. The process as claimed in claim 8 , wherein the crude oil or its products or mixture thereof comprises sulphur in the range of 0.001 wt % to 5 wt %.

10. The process as claimed in claim 8 , wherein the crude oil or its products or mixture thereof comprises nitrogen in the range of 0.01 ppm to 5000 ppm.

11. The process as claimed in claim 5 , wherein the heteroatom embedded carbon nanotube (H-CNT) comprises sulphur in the range of 0.001 wt % to 1 wt %.

12. The process as claimed in claim 5 , wherein the heteroatom embedded carbon nanotube (H-CNT) comprises nitrogen in the range of 0.01 ppm to 2000 ppm.

Assignees

• Indian Oil Corp Ltd

Inventors

• Mohanasundaram Palvannan
• Samala Bhanumurthy
• Seshubabu Narayanam
• Singh Amardeep
• Raman Naduhatty Selai
• RAMAKUMAR Sankara Sri Venkata
• Das Biswapriya

Classifications

• Y10S977/744

  having atoms interior to the carbon cage · CPC title

• H01M4/22

  Forming of electrodes · CPC title

• H01M10/06

  Lead-acid accumulators (semi-lead accumulators H01M10/20) · CPC title

• Y10S977/842

  for carbon nanotubes or fullerenes · CPC title

• H01M4/5825

  Oxygenated metallic salts or polyanionic structures, e.g. borates, phosphates, silicates, olivines · CPC title