Secondary battery, multifunctional diaphragm and preparation method

A secondary battery, multi-functional technology, applied in nickel batteries, alkaline batteries, battery pack parts and other directions, can solve the problems of inability to comprehensively suppress, fall off active substances, serious side reactions, etc. The effect of preventing excessive oxygen recombination of the negative electrode and improving the cycle life

Active Publication Date: 2021-10-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These modified separators are designed to improve the hydrophilicity, porosity, and ionic conductivity of the separator, but their functions are still relatively single, and cannot comprehensively suppress common problems in secondary batteries, such as dendrite growth, deformation, Active material falling off, electrolyte volatilization, serious side reactions (hydrogen evolution reaction, oxygen evolution reaction), etc.

Method used

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  • Secondary battery, multifunctional diaphragm and preparation method
  • Secondary battery, multifunctional diaphragm and preparation method
  • Secondary battery, multifunctional diaphragm and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Bi powder with a particle size of 100 nm, Zn powder with a particle size of 800 mesh, potassium polyacrylate particles, and gas-phase Al 2 o 3 , 60 wt.% PTFE aqueous solution was weighed and prepared at 7:5:3:3:2, and then other components except PTFE aqueous solution were placed in the mortar, and the powder was fully mixed by mechanical stirring and grinding. The components are evenly dispersed;

[0039] (2) Add PTFE aqueous solution and an appropriate amount of zinc-nickel battery electrolyte (30 wt.% KOH solution) to the mixed powder, and fully stir to form a soft and elastic powder; the added zinc-nickel battery electrolyte It can be followed: for every 0.7g of Bi powder in step (1), add 0.3 mL of electrolyte.

[0040](3) Use a roller press to press the dough into a film with a film thickness of 0.04 mm. After the film is formed, cut the film into a size of 100×80 mm for later use, or cut the size according to requirements; during the molding process, The me...

Embodiment 2

[0051] The difference between this embodiment and the above-mentioned embodiment 1 lies in: the ratio of each component in step (1).

[0052] (1) Bi powder with a particle size of 100 nm, Zn powder with a particle size of 800 mesh, potassium polyacrylate particles, and gas-phase Al 2 o 3 , 60 wt.% PTFE aqueous solution was weighed and prepared at 8:7:2:1:2, and then other components except PTFE aqueous solution were placed in the mortar, and the powder was fully mixed by mechanical stirring and grinding. The components are evenly dispersed;

[0053] Subsequent steps (2) to (8) are consistent with those in Example 1. In the (5) step (5) of the zinc-nickel battery assembled with the diaphragm, the charge-discharge cycle test was carried out under the test conditions of a rate of 4C and a depth of discharge of 70%. After the cycle, the voltage dropped below 1.25 V, and the discharge voltage platform showed a steady downward trend, but there was no obvious short circuit phenome...

Embodiment 3

[0055] The difference between this embodiment and the above-mentioned embodiment 1 lies in: the ratio of each component in step (1).

[0056] (1) Bi powder with a particle size of 100 nm, Zn powder with a particle size of 800 mesh, potassium polyacrylate particles, and gas-phase Al 2 o 3 , 60 wt.% PTFE aqueous solution was weighed and prepared at 5:8:2:3:2, and then other components except PTFE aqueous solution were placed in the mortar, and the powder was fully mixed by mechanical stirring and grinding. The components are evenly dispersed;

[0057] Subsequent steps (2) to (8) are consistent with those in Example 1.

[0058] In the (5) step (5) of the zinc-nickel battery assembled with the diaphragm, the charge-discharge cycle test was carried out under the test conditions of a rate of 4C and a depth of discharge of 70%. After the cycle, the voltage dropped to around 1.20 V, and the discharge voltage plateau showed a steady downward trend, but there was no obvious short cir...

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Abstract

The invention discloses a secondary battery, a multifunctional diaphragm and a preparation method. The secondary battery includes a multifunctional diaphragm, and the multifunctional diaphragm is mainly composed of a main conductive agent, a secondary conductive agent, an auxiliary agent, a water retaining agent, and a binder, and The film was prepared by physical rolling method. The multifunctional separator of the present invention can effectively perform multiple functions in secondary batteries to improve the cycle life and calendar life of the battery: 1) inhibit the deformation, dendrite growth, active material shedding and other problems that are common in zinc negative electrodes in secondary batteries; 2) Due to its conductive properties, the multi-functional separator can become an extension of the zinc negative electrode, increasing the area of ​​the effective conductive network of the electrode; 3) The multi-functional separator has strong water retention, which can inhibit the common electrolyte of the battery under the semi-open system. 4) Inhibit the hydrogen evolution reaction of the battery. For zinc-nickel batteries, it can also effectively recombine the oxygen precipitated inside the battery to prevent excessive oxygen recombination at the negative electrode.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a secondary battery, a multifunctional diaphragm and a preparation method. Background technique [0002] At present, the battery technologies for energy storage applications are mainly lithium batteries and lead-acid batteries. Compared with lithium-ion batteries, which have great safety hazards and high costs, lead-acid batteries, as a representative of water-based batteries, have the advantages of intrinsic safety and low cost. , has been widely used. At present, the separators commonly used in secondary batteries are mainly glass fiber, filter paper and polypropylene separators, but these separators have a single component and can only achieve simple physical insulation of the positive and negative electrodes. At present, research is devoted to improving traditional diaphragms, such as modified diaphragms obtained by modifying phosphate and sulfonate com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M50/449H01M50/446H01M50/403H01M10/30
CPCH01M50/449H01M50/446H01M50/403H01M10/30Y02E60/10
Inventor 赵泽泉钟澄胡文彬宋永江刘丝靓
Owner TIANJIN UNIV
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