Sodium lignosulfonate used as organic expansion agent for the
negative electrode of lead-acid battery
Sodium Lignonsulphonate :
A small amount of additives must be added to the negative
activation substance of lead-acid battery, which is called
expansion agent. Expansion agent has two aspects of the role: (1)
can prevent the negative active material due to large specific
surface area, thermodynamic instability, recrystallization in the
process of charging and discharging, so that the specific surface
area is constantly reduced, so that the negative active material
loss of porosity and capacity decline, ultimately leading to
battery failure; ② Depassivation under high rate discharge, low
temperature and high acid concentration. The use of expansion agent
can obviously increase the cycle charge and discharge times of the
battery, improve the low temperature discharge capacity of the tube
battery, improve the charge acceptance capacity, increase the
negative active material surface area and stabilize its structure.
Sodium lignosulfonate is a widely used organic expansion agent.
The active material of lead-acid battery electrode is composed of
lead compound or metal lead particles as the skeleton, which is
surrounded by pores of various shapes. When the battery is charged
and discharged, it is filled with electrolyte in the pores. The
pores of active substances are the migration channel of
electrolyte, which determines the existence state, quantity and
proportion of electrolytic liquid phase. The number, shape and
arrangement of pores directly affect the performance of the
battery. In lead-acid batteries, on the one hand, sodium
lignosulfonate combines with lead ions in solution to form lead
lignosulfonate, which makes lead lignosulfonate molecules coagitate
and cement together. On the other hand, lignosulfonic acid is
adsorbed on the surface of PbO particles, promoting the adhesion
and agglomeration of lead oxide particles, and finally forming a
stable aggregation structure with certain pores, which ensures the
charge-discharge performance of the battery.
| NO | Index items | Standard value | Test Results |
| 1 | Appearance | Brown powder | Meets the requirement |
| 2 | PH Value(1% soluble) | 7-9 | 8.8 |
| 3 | Dry matter | 93%min | 93.50 |
| 3 | Moisture | 7.0%max | 6.5 |
| 4 | lignosulphonate | 60%min | 61.40 |
| 5 | Total reducing matter | 4.0% max | 2.3 |
| 6 | Inorganic salt (Na₂SO₄) | 2.0%max | 0.5 |
| 7 | Water insoluble matter | 3.0%max | 1.78 |
| 8 | Calcium Magnesium General quantity | 0.5%max | 0.25 |
| 9 | Viscosity(20% aqueous solution 18-20℃) | 7-10 | 8.7 |
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