Absorbent glass mat separators, VRLA batteries, and related methods of manufacture and use
Disclosed herein are soluble content absorbent glass mats or AGM separators for VRLA, AGM, or VRLA AGM batteries. Such glass mats may be prepared from insoluble glass fibers blended with soluble content materials. Upon exposure to a suitable solvent, the dissolving or solvating of the soluble content produces voids within the glass mat. The voids enhance the absorption of the solvent within the glass mat. The soluble content may be acid-soluble glass fibers or microfibers.
1. An absorptive glass mat for a SLA, VRLA, AGM, or VRLA AGM battery or battery string comprising:
a) acid insoluble fibers or material, and
b) at least one acid soluble glass component, wherein the soluble glass component is a microfiber comprising silicon oxide and wherein the acid soluble glass microfiber has an average fiber length less than 2 microns.
2. The absorptive glass mat of claim 1 wherein the soluble glass component further comprises at least one of aluminum oxide, boron oxide, sodium oxide, potassium oxide, calcium oxide, magnesium oxide, barium oxide, and zinc oxide.
3. The absorptive glass mat of claim 1 wherein the acid soluble glass microfiber is present in an amount from 0.1-20 by weight of the absorptive glass mat.
4. The absorptive glass mat of claim 1 wherein the acid soluble glass microfiber has an average fiber diameter of 0.02-10 microns.
5. The absorptive glass mat of claim 1 wherein the absorptive glass mat further includes a pasting paper or a separator precursor.
6. The absorptive glass mat of claim 1 wherein the acid soluble glass component further includes a material, a fiber, a polymer, a salt, a layer, a flake, a particle, a piece, a portion, and/or blends, mixtures or combinations thereof.
7. The absorptive glass mat of claim 1 wherein the soluble glass microfiber further comprising at least one other compound selected from aluminum oxide, boron oxide, sodium oxide, potassium oxide, calcium oxide, magnesium oxide, barium oxide, zinc oxide, and mixtures thereof.
8. A method of making a battery comprising the step of: combining a compressed absorptive glass mat with an electrolyte, the compressed absorptive glass mat comprises:
electrolyte insoluble fibers or materials, and
at least one electrolyte soluble glass component, wherein the electrolyte soluble glass component comprises acid-soluble glass microfibers and wherein the acid soluble glass microfibers have an average fiber length less than 2 microns.
9. A valve-regulated lead-acid battery comprising:
at least two oppositely charged electrodes in a closed case,
an electrolyte comprising a dissolved glass component from a glass mat containing an acid soluble glass component, wherein the soluble glass component is a microfiber comprising silicon oxide and wherein the acid soluble glass microfiber has an average fiber length less than 2 microns; and
a separator between adjacent ones of said electrodes.
10. An absorptive glass mat (AGM) separator comprising:
a) acid insoluble fibers, and
b) at least one acid soluble glass fiber, wherein the soluble glass component is a microfiber comprising silicon oxide and wherein the acid soluble glass microfiber has an average fiber length less than 2 microns.