CN110600716A - Positive electrode slurry of high-specific-energy zinc-nickel battery and positive electrode slurry making method - Google Patents
Positive electrode slurry of high-specific-energy zinc-nickel battery and positive electrode slurry making method Download PDFInfo
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Abstract
The application discloses positive electrode slurry of a high-specific-energy zinc-nickel battery and a positive electrode pulping method, belongs to the technical field of zinc-nickel battery preparation processes, and solves the problems that in the prior art, active substances of the zinc-nickel battery are not tightly combined with a substrate, the distribution of the components is not uniform, the active substances are softened and fall off due to small viscosity of the slurry, the consistency of the battery is poor, and the cycle life is short. The positive electrode slurry comprises the following components in percentage by mass: 30-40% of nickel hydroxide, 15-20% of nickel powder, 0.2-1% of naphthalenesulfonic acid formaldehyde condensate, 0.1-0.3% of polytetrafluoroethylene emulsion, 0.5-1% of antimony trioxide, 1-2% of polyaniline, 0.5-1% of sodium perborate, 0.3-0.8% of hydroxypropyl methyl cellulose and the balance of water. The positive electrode slurry and the positive electrode slurry preparation method of the high-specific-energy zinc-nickel battery can be used for preparing the zinc-nickel battery.
Description
Technical Field
The application relates to a zinc-nickel battery preparation process, in particular to anode slurry of a zinc-nickel battery with high specific energy and an anode slurry preparation method.
Background
As the proportion of electric vehicles contributing to vehicle drive increases, the demand for battery energy increases dramatically, especially for full hybrid and plug-in hybrid vehicles, which impose more stringent standards on battery energy.
The emerging high-specific-energy zinc-nickel battery has the obvious advantages of high working voltage, high energy density, no environmental pollution, high safety index, low production cost and the like, and is a secondary battery capable of being recycled. However, the cycle times of the high specific energy zinc-nickel battery are limited, and the development of the high specific energy zinc-nickel battery is greatly restricted.
In the high-specific energy zinc-nickel battery, the active substances are not tightly combined with the matrix, so that the active substances are softened and fall off; meanwhile, since the positive active material generally contains a large amount of components, it is difficult to achieve absolutely sufficient uniform dispersion of the positive active material in the preparation of the slurry, and the uniformity of the battery is poor.
In addition, the subsequent manufacturing process is influenced by the molding state and viscosity of the mixing paste, and the viscosity of the slurry prepared by the prior art is low, so that the slurry prepared by the prior art is only suitable for sheet preparation in a slurry pulling mode, and the prepared pole piece is thin, short in cycle life and poor in consistency.
Disclosure of Invention
In view of the above analysis, the present application aims to provide a positive electrode slurry for a high specific energy zinc-nickel battery and a positive electrode slurry preparation method, which solve the problems in the prior art that the active material and the matrix of the zinc-nickel battery are not tightly bonded, the components are not uniformly distributed, and the slurry viscosity is low, so that the active material is softened and falls off, the battery consistency is poor, and the cycle life is short.
The purpose of the application is mainly realized by the following technical scheme:
the application provides a positive electrode slurry of a high-specific-energy zinc-nickel battery, which comprises the following components in percentage by mass: 30-40% of nickel hydroxide, 15-20% of nickel powder, 0.2-1% of naphthalenesulfonic acid formaldehyde condensate, 0.1-0.3% of polytetrafluoroethylene emulsion, 0.5-1% of antimony trioxide, 1-2% of polyaniline, 0.5-1% of sodium perborate, 0.3-0.8% of hydroxypropyl methyl cellulose and the balance of water.
In one possible design, the specific energy of the zinc-nickel battery is between 90Wh/kg and 120 Wh/kg.
The application also provides a positive electrode pulping method of the high-specific-energy zinc-nickel battery, which is used for the positive electrode slurry of the high-specific-energy zinc-nickel battery, and the positive electrode pulping method comprises the following steps:
step 1: weighing nickel hydroxide, water, nickel powder, a naphthalenesulfonic acid formaldehyde condensate, a polytetrafluoroethylene emulsion, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose according to a proportion;
step 2: stirring and mixing nickel hydroxide, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose, and adding water during stirring to obtain a mixture;
and step 3: stirring and mixing nickel powder, the mixture and a naphthalenesulfonic acid formaldehyde condensate, and adding water in the stirring process to obtain primary mixed slurry;
and 4, step 4: and stirring and mixing the polytetrafluoroethylene emulsion and the primary mixed slurry to obtain the anode slurry.
The step 2 comprises the following steps:
step 21: dividing nickel hydroxide into two parts, wherein the first part of nickel hydroxide is 1/3-1/2 of the total amount of nickel hydroxide;
step 22: sequentially adding antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose into the first part of nickel hydroxide, and stirring and mixing to obtain a primary mixture;
step 23: and adding the second part of nickel hydroxide into the primary mixture, and stirring and mixing to obtain a mixture.
In one possible design, in the step 2, the stirring speed is 60Rpm to 150Rpm, and the stirring time is 5min to 15 min.
In one possible design, in the step 3, the stirring speed is 120Rpm to 400Rpm, and the stirring time is 20min to 50 min.
In one possible design, the water is added for a period of time of 1-5 min in step 3.
In one possible design, in the step 3, ultrasonic oscillation is further included after stirring and mixing, the ultrasonic oscillation time is 1-5 h, and the water bath temperature is 30-100 ℃.
In one possible design, step 4, the polytetrafluoroethylene emulsion is slowly added to the primary mixed slurry, and mixed with stirring.
In one possible design, in the step 4, the stirring speed is 180Rpm to 300Rpm, and the stirring time is 5min to 30 min.
Compared with the prior art, the application can realize at least one of the following beneficial effects:
a) the positive electrode slurry of the high-specific-energy zinc-nickel battery can solve the problem that the active material is not tightly combined with a matrix and further the active material is softened and falls off due to uneven mixing of the positive electrode material of the existing high-specific-energy zinc-nickel battery, and the electrode charging acceptance capacity, the cycle life and the charging and discharging conversion efficiency are improved.
b) In the positive electrode slurry of the high-specific-energy zinc-nickel battery, the naphthalenesulfonic acid-formaldehyde condensate belongs to one of sulfonated aromatic polymers, has a sulfonated group, is attached to nickel powder as a dispersing agent, can form a polymerized conductive layer on the surface of nickel hydroxide to prevent a passivation layer from being formed, and has a unique long-chain structure which is beneficial to wrapping particles, so that the binding force among all components of the paste is effectively improved on the basis of not influencing the conductive performance of active substances.
c) In the positive electrode slurry of the high-specific-energy zinc-nickel battery, the polytetrafluoroethylene emulsion is used as the binder, the structural stability of the additive and the nickel powder in the slurry can be kept, the hydroxypropyl methyl cellulose is used as the thickening agent, the viscosity of the slurry can be increased, the active substances can be kept at proper viscosity by matching the polytetrafluoroethylene emulsion with the hydroxypropyl methyl cellulose, and the time for coating plate forming is shortened.
d) The antimony trioxide is added into the positive electrode slurry of the high-specific-energy zinc-nickel battery, so that the effect of a nucleating agent can be achieved, and the initial capacity of the positive plate is increased; due to the existence of Sb, a passivation layer is effectively prevented from being formed between the matrix made of foamed nickel and the active substance, the active substance is prevented from falling off from the grid, the early capacity attenuation of the battery is prevented, meanwhile, the contact resistance between the active substance and the matrix is reduced, and the charging conversion efficiency of the battery is improved.
e) In the positive electrode slurry of the high-specific-energy zinc-nickel battery, the sodium perborate is added, hydrogen peroxide and sodium borate can be generated through reaction in a paste mixing process, active oxygen released by decomposition of hydrogen peroxide and strong oxidizing property of hydrogen peroxide are beneficial to accelerating and improving the oxidation degree of lead powder, the curing time is reduced, and a stable active substance network structure is beneficial to formation; meanwhile, hydrogen ion content in the lead paste can be improved by hydrogen peroxide ionization.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description.
Detailed Description
Preferred embodiments of the present application are described in detail below.
The application provides a positive electrode slurry of a high-specific-energy zinc-nickel battery, which comprises the following components in percentage by mass: 30-40% of nickel hydroxide, 15-20% of nickel powder, 0.2-1% of naphthalenesulfonic acid formaldehyde condensate, 0.1-0.3% of polytetrafluoroethylene emulsion, 0.5-1% of antimony trioxide, 1-2% of polyaniline, 0.5-1% of sodium perborate, 0.3-0.8% of hydroxypropyl methyl cellulose and the balance of water (such as pure water).
Compared with the prior art, the positive electrode slurry of the high-specific-energy zinc-nickel battery can solve the problem that the active material is not tightly combined with the matrix and further the active material is softened and falls off due to uneven mixing of the positive electrode material of the conventional high-specific-energy zinc-nickel battery, and the electrode charging acceptance capacity, the cycle life and the charging and discharging conversion efficiency are improved, wherein in the prior art, the specific energy of the zinc-nickel battery is usually 50 Wh/kg-70 Wh/kg, and the specific energy of the zinc-nickel battery can reach more than 90, for example 90 Wh/kg-120 Wh/kg, by adopting the positive electrode slurry.
Specifically, the naphthalene sulfonic acid formaldehyde condensate belongs to one of sulfonated aromatic polymers, has a sulfonated group, is attached to nickel powder as a dispersant, can form a polymerized conductive layer on the surface of nickel hydroxide to prevent the formation of a passivation layer, and has a unique long-chain structure which is beneficial to coating particles, so that the binding force among the components of the paste is effectively improved on the basis of not influencing the conductive performance of an active substance.
The polytetrafluoroethylene emulsion is used as a binder, can keep the structural stability of additives and nickel powder in the slurry, the hydroxypropyl methyl cellulose is used as a thickening agent, can increase the viscosity of the slurry, and the active substances can keep proper viscosity by matching the polytetrafluoroethylene emulsion and the hydroxypropyl methyl cellulose, so that the time for forming a coated plate is shortened.
The antimony trioxide is added to play a role of a nucleating agent, so that the initial capacity of the positive plate is increased; due to the existence of Sb, a passivation layer is effectively prevented from being formed between the matrix made of foamed nickel and the active substance, the active substance is prevented from falling off from the grid, the early capacity attenuation of the battery is prevented, meanwhile, the contact resistance between the active substance and the matrix is reduced, and the charging conversion efficiency of the battery is improved.
The addition of the sodium perborate can react to generate hydrogen peroxide and sodium borate in the paste mixing process, active oxygen released by hydrogen peroxide decomposition and strong oxidizing property of the hydrogen peroxide are beneficial to accelerating and improving the oxidation degree of lead powder, reducing the curing time and forming a stable active substance network structure, and in addition, due to the increase of deep oxidation, the binding force between an active substance and a grid is also enhanced, the binding force of the active substance is increased in the charging and discharging processes of a polar plate, and the active substance is ensured not to be loose and fall off; meanwhile, hydrogen ion content in the lead paste can be improved by hydrogen peroxide ionization.
The application also provides a positive electrode pulping method of the high-specific-energy zinc-nickel battery, which comprises three steps of dry mixing, primary mixing and secondary mixing, and specifically comprises the following steps:
step 1: weighing nickel hydroxide, water, nickel powder, a naphthalenesulfonic acid formaldehyde condensate, a polytetrafluoroethylene emulsion, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose according to a proportion.
Step 2: dry mixing: stirring and mixing nickel hydroxide, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose to obtain a mixture. The nickel hydroxide and the additive are fully mixed by dry mixing, and the unique long-chain structure of the naphthalene formaldehyde condensate is attached to the mixed material and the nickel hydroxide, so that particles are wrapped, and the nickel hydroxide which is not easy to disperse and the mixed material are uniformly distributed in the anode slurry.
And step 3: primary mixing: and stirring and mixing the nickel powder, the mixture and the naphthalene sulfonic acid formaldehyde condensate at a high speed, and adding water in the stirring process to obtain primary mixed slurry. The nickel powder, the mixture and the naphthalenesulfonic acid-formaldehyde condensate are added and mixed simultaneously, a stirring mode is adopted in the process, the long chain of the naphthalenesulfonic acid-formaldehyde condensate is attached to the mixture (components of the mixture, such as nickel hydroxide), the hydrophobicity of the mixture is changed, then the mixture is mixed with water, the naphthalenesulfonic acid-formaldehyde condensate is attached more tightly through ultrasonic vibration, and the primary mixed slurry is distributed uniformly.
And 4, step 4: and (3) secondary mixing: and mixing the polytetrafluoroethylene emulsion with the primary mixed slurry to obtain the anode slurry.
Specifically, the step 2 includes the following steps:
step 21: the method comprises the following steps of dividing nickel hydroxide into two parts, wherein the first part of nickel hydroxide is 1/3-1/2 of the total amount of nickel hydroxide, and mixing the nickel hydroxide twice, so that the nickel hydroxide is favorably dispersed;
step 22: sequentially adding antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose into the first part of nickel hydroxide, and stirring and mixing to obtain a primary mixture;
step 23: and adding a second part of nickel hydroxide into the primary mixture, and uniformly mixing to obtain a mixture.
In order to achieve the purpose of preliminary premixing and improve the mixing uniformity of the antimony trioxide, the polyaniline, the sodium perborate and the hydroxypropyl methyl cellulose, in the step 2 (step 22), the stirring speed is 60Rpm to 150Rpm, and the stirring time is 5min to 15 min. By adopting the stirring speed and the stirring time, the antimony trioxide, the polyaniline, the sodium perborate and the hydroxypropyl methyl cellulose can be fully contacted and uniformly mixed, so that the purpose of preliminary premixing is achieved.
It should be noted that, after dry mixing, there may be ununiform mixing between the components, and in order to further improve the mixing uniformity of the components, in the step 3, the stirring speed is 120 to 400Rpm, and the stirring time is 20 to 50 min. By adopting the stirring speed and the stirring time, compared with the stirring speed and the stirring time of dry mixing, the stirring speed of one-time mixing is higher, and the stirring time is longer, so that each component which is not completely and uniformly mixed in the dry mixing process can achieve better mixing effect through high-speed long-time stirring, and meanwhile, the naphthalene formaldehyde condensate is gradually mixed and attached to the nickel hydroxide and the nickel powder to prepare for subsequent mixing with water.
In order to reduce the impact of water flow on the nickel powder, the mixture and the naphthalene sulfonic acid formaldehyde condensate, in the step 3, the adding time of water is 1-5 min. The water is slowly added into the nickel powder, the mixture and the naphthalenesulfonic acid-formaldehyde condensate, so that the impact of water flow on the nickel powder, the mixture and the naphthalenesulfonic acid-formaldehyde condensate can be reduced, the separation among the fully combined components can be further reduced, and meanwhile, the slow addition of the water can also promote the hydration of the nickel hydroxide to form a hydrated compound.
In order to form a primary slurry with a more compact structure, in the step 3, ultrasonic oscillation is required after mixing and stirring, the ultrasonic oscillation time is 1-5 h, and the water bath temperature is 30-100 ℃. The naphthalenesulfonic acid formaldehyde condensate attached to the nickel hydroxide gradually adsorbs other additives by ultrasonic oscillation, so that a primary slurry with a compact structure is formed.
In order to further improve the mixing uniformity and the binding force of each component in the positive electrode slurry, in the step 4, the polytetrafluoroethylene emulsion can be slowly added into the primary mixed slurry, the mixture is uniformly stirred, other additives and nickel hydroxide are uniformly mixed at the moment, and the polytetrafluoroethylene emulsion is slowly added, so that the mixing uniformity and the binding force of each component in the positive electrode slurry can be ensured to the greatest extent. Specifically, in the step 4, the stirring speed is 180 to 300Rpm, and the stirring time is 5 to 30 min.
Example one
The positive electrode slurry of the high specific energy zinc-nickel battery of the embodiment comprises the following components in percentage by mass: 30% of nickel hydroxide, 16% of nickel powder, 0.7% of naphthalene sulfonic acid formaldehyde condensate, 0.3% of polytetrafluoroethylene emulsion, 0.5% of antimony trioxide, 1.9% of polyaniline, 0.6% of sodium perborate, 0.7% of hydroxypropyl methyl cellulose and the balance of water.
The positive electrode pulping method comprises the following steps:
step 1: weighing nickel hydroxide, water, nickel powder, a naphthalenesulfonic acid formaldehyde condensate, a polytetrafluoroethylene emulsion, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose according to a proportion.
Step 2: the method comprises the steps of dividing nickel hydroxide into two parts, wherein the first part of nickel hydroxide is 1/3 of the total amount of the nickel hydroxide, sequentially adding antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose into the first part of nickel hydroxide, stirring and mixing at the rotating speed of 60Rpm for 10min to obtain a primary mixture, adding the second part of nickel hydroxide into the primary mixture, and uniformly mixing to obtain a mixture.
And step 3: and stirring and mixing the nickel powder, the mixture and the naphthalenesulfonic acid formaldehyde condensate at a high speed of 120Rpm for 40min, adding water during stirring, wherein the adding duration of the water is 4min, and ultrasonically oscillating for 1.5h at the water bath temperature of 95 ℃ to obtain primary mixed slurry.
And 4, step 4: and slowly adding the polytetrafluoroethylene emulsion into the primary mixed slurry, and stirring and mixing for 30min at 180Rpm to obtain the anode slurry.
The zinc-nickel battery of this example was assembled into an 8Ah sealed zinc-nickel battery according to the prior art zinc-nickel battery assembly method, and the specific energy of the zinc-nickel battery was 93 Wh/kg.
Example two
The positive electrode slurry of the high specific energy zinc-nickel battery of the embodiment comprises the following components in percentage by mass: 37% of nickel hydroxide, 19% of nickel powder, 0.3% of naphthalene sulfonic acid formaldehyde condensate, 0.1% of polytetrafluoroethylene emulsion, 0.9% of antimony trioxide, 1.2% of polyaniline, 1.0% of sodium perborate, 0.3% of hydroxypropyl methyl cellulose and the balance of water.
The positive electrode pulping method comprises the following steps:
step 1: weighing nickel hydroxide, water, nickel powder, a naphthalenesulfonic acid formaldehyde condensate, a polytetrafluoroethylene emulsion, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose according to a proportion.
Step 2: dividing nickel hydroxide into two parts, wherein the first part of nickel hydroxide is 1/2 of the total amount of nickel hydroxide, sequentially adding antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose into the first part of nickel hydroxide, stirring and mixing at the rotating speed of 90Rpm for 15min to obtain a primary mixture, adding the second part of nickel hydroxide into the primary mixture, and uniformly mixing to obtain a mixture.
And step 3: and stirring and mixing the nickel powder, the mixture and the naphthalenesulfonic acid formaldehyde condensate at a high speed of 350Rpm for 20min, adding water in the stirring process, wherein the adding duration of the water is 1min, and ultrasonically oscillating for 5h at the water bath temperature of 35 ℃ to obtain primary mixed slurry.
And 4, step 4: and slowly adding the polytetrafluoroethylene emulsion into the primary mixed slurry, and stirring and mixing for 9min at 300Rpm to obtain the anode slurry.
The zinc-nickel battery of the embodiment is assembled into a sealed zinc-nickel battery of 8Ah according to the method for assembling the zinc-nickel battery in the prior art, and the specific energy of the zinc-nickel battery is 99 Wh/kg.
EXAMPLE III
The positive electrode slurry of the high specific energy zinc-nickel battery of the embodiment comprises the following components in percentage by mass: 39% of nickel hydroxide, 15% of nickel powder, 0.9% of naphthalene sulfonic acid formaldehyde condensate, 0.3% of polytetrafluoroethylene emulsion, 0.6% of antimony trioxide, 1.0% of polyaniline, 0.5% of sodium perborate, 0.8% of hydroxypropyl methyl cellulose and the balance of water.
The positive electrode pulping method comprises the following steps:
step 1: weighing nickel hydroxide, water, nickel powder, a naphthalenesulfonic acid formaldehyde condensate, a polytetrafluoroethylene emulsion, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose according to a proportion.
Step 2: dividing nickel hydroxide into two parts, wherein the first part of nickel hydroxide is 1/3 of the total amount of nickel hydroxide, sequentially adding antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose into the first part of nickel hydroxide, stirring and mixing at the rotating speed of 150Rpm for 5min to obtain a primary mixture, adding the second part of nickel hydroxide into the primary mixture, and uniformly mixing to obtain a mixture.
And step 3: and stirring and mixing the nickel powder, the mixture and the naphthalenesulfonic acid formaldehyde condensate at a high speed of 200Rpm for 50min, adding water during stirring, wherein the adding duration of the water is 5min, and ultrasonically oscillating for 1.5h at the water bath temperature of 95 ℃ to obtain primary mixed slurry.
And 4, step 4: and slowly adding the polytetrafluoroethylene emulsion into the primary mixed slurry, and stirring and mixing for 30min at 180Rpm to obtain the anode slurry.
The zinc-nickel battery of the embodiment was assembled into a sealed zinc-nickel battery of 8Ah according to the method of assembling the zinc-nickel battery in the prior art, and the specific energy of the zinc-nickel battery was 110 Wh/kg.
Example four
The positive electrode slurry of the high specific energy zinc-nickel battery of the embodiment comprises the following components in percentage by mass: 31% of nickel hydroxide, 20% of nickel powder, 1.0% of naphthalene sulfonic acid formaldehyde condensate, 0.15% of polytetrafluoroethylene emulsion, 1.0% of antimony trioxide, 2.0% of polyaniline, 0.5% of sodium perborate, 0.4% of hydroxypropyl methyl cellulose and the balance of water.
The positive electrode pulping method comprises the following steps:
step 1: weighing nickel hydroxide, water, nickel powder, a naphthalenesulfonic acid formaldehyde condensate, a polytetrafluoroethylene emulsion, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose according to a proportion.
Step 2: dividing nickel hydroxide into two parts, wherein the first part of nickel hydroxide is 1/2 of the total amount of nickel hydroxide, sequentially adding antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose into the first part of nickel hydroxide, stirring and mixing at the rotating speed of 80Rpm for 12min to obtain a primary mixture, adding the second part of nickel hydroxide into the primary mixture, and uniformly mixing to obtain a mixture.
And step 3: and stirring and mixing the nickel powder, the mixture and the naphthalenesulfonic acid formaldehyde condensate at a high speed of 400Rpm for 25min, adding water in the stirring process, wherein the adding duration of the water is 3min, and ultrasonically oscillating for 3.0h at the water bath temperature of 45 ℃ to obtain primary mixed slurry.
And 4, step 4: and slowly adding the polytetrafluoroethylene emulsion into the primary mixed slurry, and stirring and mixing for 20min at 250Rpm to obtain the anode slurry.
The zinc-nickel battery of the present example was assembled into an 8Ah sealed zinc-nickel battery according to the prior art zinc-nickel battery assembly method, and the specific energy of the zinc-nickel battery was 115 Wh/kg.
The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application.
Claims (10)
1. The positive electrode slurry of the high-specific-energy zinc-nickel battery is characterized by comprising the following components in percentage by mass: 30-40% of nickel hydroxide, 15-20% of nickel powder, 0.2-1% of naphthalenesulfonic acid formaldehyde condensate, 0.1-0.3% of polytetrafluoroethylene emulsion, 0.5-1% of antimony trioxide, 1-2% of polyaniline, 0.5-1% of sodium perborate, 0.3-0.8% of hydroxypropyl methyl cellulose and the balance of water.
2. The positive electrode slurry for a high specific energy zinc-nickel battery according to claim 1, wherein the specific energy of the zinc-nickel battery is 90Wh/kg to 120 Wh/kg.
3. The positive electrode pulping method for the high-specific-energy zinc-nickel battery, which is used for preparing the positive electrode pulp for the high-specific-energy zinc-nickel battery as claimed in claim 1 or 2, and comprises the following steps:
step 1: weighing nickel hydroxide, water, nickel powder, a naphthalenesulfonic acid formaldehyde condensate, a polytetrafluoroethylene emulsion, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose according to a proportion;
step 2: stirring and mixing nickel hydroxide, antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose, and adding water during stirring to obtain a mixture;
and step 3: stirring and mixing nickel powder, the mixture and a naphthalenesulfonic acid formaldehyde condensate, and adding water in the stirring process to obtain primary mixed slurry;
and 4, step 4: and stirring and mixing the polytetrafluoroethylene emulsion and the primary mixed slurry to obtain the anode slurry.
4. The positive electrode pulping method of the high-specific-energy zinc-nickel battery according to claim 3, wherein the step 2 comprises the following steps:
step 21: dividing nickel hydroxide into two parts, wherein the first part of nickel hydroxide is 1/3-1/2 of the total amount of nickel hydroxide;
step 22: sequentially adding antimony trioxide, polyaniline, sodium perborate and hydroxypropyl methyl cellulose into the first part of nickel hydroxide, and stirring and mixing to obtain a primary mixture;
step 23: and adding a second part of nickel hydroxide into the primary mixture, and stirring and mixing to obtain a mixture.
5. The positive electrode pulping method of the high-specific-energy zinc-nickel battery according to claim 3, wherein in the step 2, the stirring speed is 60Rpm to 150Rpm, and the stirring time is 5min to 15 min.
6. The positive electrode pulping method of the high-specific-energy zinc-nickel battery according to claim 3, wherein in the step 3, the stirring speed is 120Rpm to 400Rpm, and the stirring time is 20min to 50 min.
7. The positive electrode pulping method of the high-specific-energy zinc-nickel battery according to claim 3, wherein in the step 3, the adding time of water is 1-5 min.
8. The positive electrode pulping method of the high-specific-energy zinc-nickel battery according to claim 3, wherein in the step 3, the step of stirring and mixing further comprises ultrasonic oscillation, the ultrasonic oscillation time is 1-5 h, and the water bath temperature is 30-100 ℃.
9. The positive electrode pulping method of the high specific energy zinc-nickel battery according to claims 3 to 8, wherein in the step 4, polytetrafluoroethylene emulsion is slowly added into the primary mixed slurry, and is stirred and mixed.
10. The positive electrode pulping method of the high specific energy zinc-nickel battery according to claim 9, wherein in the step 4, the stirring speed is 180Rpm to 300Rpm, and the stirring time is 5min to 30 min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910988935.8A CN110600716B (en) | 2019-10-17 | 2019-10-17 | Positive electrode slurry of high-specific-energy zinc-nickel battery and positive electrode slurry making method |
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