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Secondary battery, multifunctional diaphragm and preparation method

A secondary battery, multi-functional technology, applied in the direction of nickel storage battery, alkaline storage battery, battery pack components, etc., can solve the problems of inability to fully suppress, active material falling off, serious side reactions, etc., to achieve the suppression of electrolyte loss, Prevent excessive oxygen recombination of the negative electrode and improve cycle life

Active Publication Date: 2021-09-21
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 comprises the multifunctional diaphragm, the multifunctional diaphragm is mainly composed of a main conductive agent, an auxiliary conductive agent, an auxiliary agent, a water-retaining agent and a binder, and the multifunctional diaphragm is prepared into a film by adopting a physical rolling method. The multifunctional diaphragm disclosed by the invention can effectively play multiple functions in the secondary battery so as to prolong the cycle life and calendar life of the battery: 1) the problems of deformation, dendritic crystal growth, active substance falling and the like commonly existing in a zinc negative electrode in the secondary battery are inhibited; 2) the multifunctional diaphragm has a conductive characteristic, so that the multifunctional diaphragm can be an extension of a zinc negative electrode, and the area of an effective conductive network of the electrode is increased; 3) the multifunctional diaphragm has strong water-retaining property so as to restrain the problem of serious electrolyte loss generally existing in a battery in a semi-open system, 4) the multifunctional diaphragm can restrain the hydrogen evolution reaction of the battery, and for a zinc-nickel battery, oxygen separated out from the interior of the battery can be effectively compounded so as to prevent excessive oxygen recombination of a 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 Applications(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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