Battery electrode plate reinforcement mat having improved wettability characteristics and methods of use therefor

Patent metadata

Field	Value
Publication number	US-10971709-B2
Application number	US-201816049988-A
Country	US
Kind code	B2
Filing date	Jul 31, 2018
Priority date	Oct 8, 2013
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

Abstract

According to one embodiment, a nonwoven fiber mat for reinforcing a plate or electrode of a lead-acid battery includes a plurality of glass fibers and an acid resistant binder that couples the plurality of glass fibers together. The nonwoven fiber mat also includes a wetting component that is applied to the glass fibers and/or nonwoven fiber mat to increase the wettability of the nonwoven fiber mat such that the nonwoven fiber mat exhibits an average water wick height of at least 0.5 cm after exposure to water for 10 minutes conducted according to method ISO8787. The wetting component may be dissolvable in an acid solution of the lead-acid battery such that a significant portion of the nonwoven fiber mat is lost due to dissolving of the wetting component.

First claim

What is claimed is:

1. A method of manufacturing a nonwoven fiber mat for reinforcing a plate or electrode of a lead-acid battery, the method comprising:
providing a plurality of glass fibers;
applying a binder mixture to the plurality of glass fibers to couple the plurality of glass fibers together to form the nonwoven fiber mat so as to exhibit a loss on ignition (LOI) of up to about 20%, the binder mixture comprising an acid resistant binder that bonds the plurality of glass fibers and a poly acrylic acid based binder that increases the wettability of the nonwoven fiber mat such that the nonwoven fiber mat has or exhibits an average water wick height of at least 0.5 cm after exposure to water for 10 minutes conducted according to method IS08787; and
exposing the nonwoven fiber mat to an acid solution to dissolve at least some of the poly acrylic acid based binder, wherein a portion of the nonwoven fiber mat is lost due to dissolving of the at least some of the poly acrylic acid based binder.

2. The method of claim 1 , wherein the portion of the nonwoven fiber mat that is lost due to dissolving of the at least some of the poly acrylic acid based binder comprises between about 5-85% of the mass of the nonwoven fiber mat.

3. The method of claim 1 , wherein the nonwoven fiber mat is exposed to between 15-65% by weight of the acid solution.

4. The method of claim 1 , wherein the acid resistant binder includes a hydrophilic functional group that functions as a wetting component to increase the wettability of the nonwoven fiber mat.

5. The method of claim 1 , further comprising bonding a plurality of cellulose fibers with the plurality of glass fibers of the nonwoven fiber mat.

6. The method of claim 5 , wherein the nonwoven fiber mat comprises between about 40-60% of the glass fibers and 40-60% of the cellulose fibers.

7. The method of claim 1 , further comprising applying a starch solution to the nonwoven fiber mat such that the starch solution saturates the nonwoven fiber mat or is disposed on at least one surface of the nonwoven fiber mat.

8. The method of claim 1 , wherein the plurality of glass fibers comprise first glass fibers having fiber diameters between about 8 μm and about 30 μm and wherein the method further comprises:
providing a plurality of second glass fibers having fiber diameters between about 0.01 μm and about 5 μm; and
bonding the plurality of second glass fibers with the first glass fibers via the acid resistant binder, wherein the addition of the second glass fibers increases the wettability of the nonwoven fiber mat such that the nonwoven fiber mat has or exhibits an average water wick height of at least 1.0 cm after exposure to water for 10 minutes conducted according to method 1808787.

9. The method of claim 8 , further comprising bonding cellulose fibers with the first glass fibers and the plurality of second glass fibers, and wherein the nonwoven fiber mat comprises between about 40-80% of the first glass fibers, 10-50% of the second glass fibers, and 5-40% of the cellulose fibers.

Assignees

• Johns Manville

Inventors

• Guo Zhihua
• Nandi Souvik
• Asrar Jawed
• Dietz Iii Albert G

Classifications

• H01M50/437

  Glass · CPC title

• Y02E60/10

  Energy storage using batteries · CPC title

• H01M50/44 Primary

  Fibrous material · CPC title

• H01M50/46

  Separators, membranes or diaphragms characterised by their combination with electrodes · CPC title

• H01M50/4295

  Natural cotton, cellulose or wood · CPC title