Primary alkaline zinc-manganese battery negative electrode zinc paste

Abstract

The invention discloses a primary alkaline zinc-manganese battery negative electrode zinc paste. The zinc paste comprises the following components in percentage by mass: 0.02%-4% of a binder, 60%-75% of zinc powder, 25%-35% of an electrolyte and 0.01%-5% of a corrosion inhibitor, wherein the binder is composed of polyacrylic acid and potassium polyacrylate, the addition amount of the polyacrylic acid is 0.01%-2% of the total mass of the zinc cream, the addition amount of the potassium polyacrylate is 0.01%-2% of the total mass of the zinc cream, and the proportion of the rest raw materials in the total mass of the zinc cream is a conventional numerical value. When the zinc paste obtained by the invention is applied to the primary alkaline manganese battery, the ion conductivity of the battery can be effectively improved, and the impedance of the battery is reduced, so that the large-current mode performance is remarkably improved.

Description

Technical Field

[0001] This invention relates to battery processing technology, and more particularly to a zinc paste for the negative electrode of a primary alkaline zinc-manganese battery. Background Technology

[0002] As a widely used chemical power source, the electrical properties of the zinc paste, the negative electrode material, play a crucial role in the performance of primary alkaline batteries. The zinc paste itself plays a key regulatory role in the storage stability, rheological properties, and structural integrity of the zinc paste, effectively inhibiting zinc powder sedimentation and electrolyte stratification, ensuring that the zinc paste maintains a uniform conductive network and reactivity throughout the battery's lifespan. Currently, the negative electrode zinc paste used in existing primary alkaline zinc-manganese batteries is mainly composed of polyacrylic acid (PA) and sodium polyacrylate (DK). During battery use, viscous deactivation can occur after high-temperature storage or vibration-induced transportation, leading to stratification of the negative electrode zinc paste and zinc powder agglomeration. This disrupts the conductive pathway, causing increased internal resistance, decreased discharge capacity, and ultimately, reduced battery life, failing to meet the stringent requirements of high-end electronic devices for long-term battery stability and adaptability to harsh operating conditions. Summary of the Invention

[0003] The purpose of this invention is to provide a zinc paste for the negative electrode of a primary alkaline zinc-manganese battery.

[0004] The technical solution to achieve the objective of this invention is: a primary alkaline zinc-manganese battery negative electrode zinc paste, wherein the mass percentages of each component in the zinc paste are as follows: binder 0.02%–4%, zinc powder 60–75%, electrolyte 25–35%, and corrosion inhibitor 0.01–5%; wherein the binder is composed of polyacrylic acid and potassium polyacrylate, the amount of polyacrylic acid added is 0.01%–2% of the total mass of the zinc paste, and the amount of potassium polyacrylate added is 0.01%–2% of the total mass of the zinc paste.

[0005] Furthermore, the mass ratio of each component in the zinc paste is: zinc powder 75%, binder 1.01%, electrolyte 30%, and corrosion inhibitor 1.2%, and the amount of polyacrylic acid added is 0.01% of the total mass of the zinc paste, and the amount of potassium polyacrylate added is 1% of the total mass of the zinc paste. The obtained zinc paste is applied to primary alkaline zinc-manganese batteries, and the battery has good charge and discharge performance.

[0006] Furthermore, the zinc paste contains the following components in the following mass ratios: zinc powder 75%, binder 2.01%, electrolyte 30%, and corrosion inhibitor 1.2%, with polyacrylic acid added at 2% of the total mass of the zinc paste and potassium polyacrylate added at 0.01% of the total mass of the zinc paste. The resulting zinc paste, when applied to primary alkaline zinc-manganese batteries, exhibits excellent charge-discharge performance.

[0007] This invention uses a blend of polyacrylic acid and potassium polyacrylate as a binder for zinc paste. When the zinc paste formed by the simultaneous addition of polyacrylic acid and potassium polyacrylate is applied, the ionic conductivity of the battery is improved. Since the entire battery environment is within a potassium hydroxide solution system, the conductivity of potassium salts is higher than that of sodium salts, resulting in a decrease in battery impedance. Furthermore, potassium polyacrylate exhibits better stability than sodium polyacrylate. The molecular structure of potassium polyacrylate differs significantly from that of sodium polyacrylate. Besides both containing carboxylic acid groups (-COO-), potassium polyacrylate also contains amide groups (-CONH2), giving it both viscosity and water-absorbing swelling properties. The zinc paste obtained by this invention, when applied to primary alkaline manganese batteries, effectively improves the ionic conductivity of the battery, reduces battery impedance, and thus significantly enhances high-current mode performance. Detailed Implementation

[0008] The preferred embodiments of the present invention will be described in detail below. Example 1

[0009] An alkaline zinc manganese battery zinc paste, wherein the mass ratio of each component in the zinc paste is: zinc powder 75%, binder (PA 0.01%, K-PAM 1%), electrolyte 30%, and corrosion inhibitor 1.2%.

[0010] The zinc paste is prepared as follows: 1) Premixed powder: Zinc powder, zinc paste, and corrosion inhibitor are mixed and stirred at room temperature to ensure uniform dispersion of the powder; 2) Add electrolyte to the premixed powder, stir until evenly dispersed, add more electrolyte and continue stirring, then vacuum degas to obtain zinc paste.

[0011] Examples 2-5, Comparative Example 1 Examples 2-5 have the same composition as Example 1, the difference being the amount of polyacrylic acid (PA) and potassium polyacrylate (K-PAM) added to the adhesive. Comparative Example 1 differs from Example 1 in that its adhesive is composed of polyacrylic acid and sodium polyacrylate. The specific amounts of adhesive added in Examples 1-5 and Comparative Example 1 are shown in Table 1.

[0012] Table 1:

[0013] The zinc paste obtained in Examples 1-5 and Comparative Example 1 was injected into the separator tube of the semi-finished LR6 alkaline battery through glass tubes. The batteries were then sealed and shaped on the production line, and after sealing, left to stand for 24 hours for later use. After storage at 71°C for 7 days, the discharge parameters were tested, as shown in Table 2. Table 2:

[0014] The data in Table 2 shows that Examples 1-5 of the present invention have significant performance advantages over Comparative Example 1 in discharge performance, especially in the case of higher current modes. This is mainly because the examples use a zinc paste made of polyacrylic acid and potassium polyacrylate, which greatly improves the ionic conductivity of the negative electrode material, facilitates the diffusion and transport of ions and protons during the reaction, reduces internal resistance, and improves the charge and discharge performance of the battery. In addition, the added composite zinc paste has a strong adsorption capacity, which stably disperses zinc ions on the negative electrode and plays a role in fixing and connecting zinc powder particles, thereby achieving better discharge performance.

[0015] If the amount of binder used in this invention is less than 0.01% of the total mass of zinc paste, the zinc paste will not be sticky enough and will settle. If the amount of binder used is more than 5%, the battery will have a large internal resistance and greater polarization during discharge, which will affect the performance.

[0016] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent process transformations made using the content of the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A zinc paste for the negative electrode of a primary alkaline zinc-manganese battery, characterized in that: The mass percentages of each component in the zinc paste are as follows: binder 0.02%–4%, zinc powder 60–75%, electrolyte 25–35%, and corrosion inhibitor 0.01–5%. The binder is composed of polyacrylic acid and potassium polyacrylate, wherein the amount of polyacrylic acid added is 0.01%–2% of the total mass of the zinc paste, the amount of potassium polyacrylate added is 0.01%–2% of the total mass of the zinc paste, and the remaining raw materials have conventional proportions in the total mass of the zinc paste.

2. The zinc paste for the negative electrode of a primary alkaline zinc-manganese battery according to claim 1, characterized in that: The zinc paste contains the following components in the following mass ratios: zinc powder 75%, binder 1.01%, electrolyte 30%, and corrosion inhibitor 1.2%; and the amount of polyacrylic acid added is 0.01% of the total mass of the zinc paste, and the amount of potassium polyacrylate added is 1% of the total mass of the zinc paste.

3. The zinc paste for the negative electrode of a primary alkaline zinc-manganese battery according to claim 1, characterized in that: The zinc paste contains the following components in the following mass ratios: zinc powder 75%, binder 2.01%, electrolyte 30%, and corrosion inhibitor 1.2%; and the amount of polyacrylic acid added is 2% of the total mass of the zinc paste, and the amount of potassium polyacrylate added is 0.01% of the total mass of the zinc paste.

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