CN114307800A - Lithium battery material preparation system and preparation method - Google Patents
Lithium battery material preparation system and preparation method Download PDFInfo
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- CN114307800A CN114307800A CN202210087070.XA CN202210087070A CN114307800A CN 114307800 A CN114307800 A CN 114307800A CN 202210087070 A CN202210087070 A CN 202210087070A CN 114307800 A CN114307800 A CN 114307800A
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Abstract
A lithium battery material preparation system and a preparation method are provided, wherein the lithium battery material preparation system comprises a powder mixer, a dispersion machine, a first circulating stirring tank, a second circulating stirring tank and a feeding device; the material input end of the first circulating stirring tank is connected with the output end of the feeding device; the invention also discloses a preparation method of the lithium battery material. The invention can improve the production efficiency of the lithium battery material and is beneficial to improving the consistency of the lithium battery material.
Description
Technical Field
The invention belongs to the technical field of lithium battery material production, and particularly relates to a lithium battery material preparation system and a preparation method.
Background
The lithium battery material comprises a positive electrode material and a negative electrode material, taking the preparation of the positive electrode material as an example, the traditional dry pulping process is adopted in the current production, and the steps are as follows:
firstly, adding all the anode powder materials into a stirrer, stirring and premixing for 30min, adding a CNT conductive agent, adding 30-45% of NMP solvent, performing slow pre-stirring for 20-40min, wherein the revolution speed of the stirrer is 20-30 rpm, the dispersion speed is 800-1500 rpm, and stirring for 1-1.5 h;
secondly, after the step one is finished, adding 25-35% of NMP solvent to carry out slow stirring for 10-30min, and then stirring for 1-1.5h at a revolution speed of 30-40rpm, a dispersion speed of 1200-1800rpm and a vacuum degree of less than or equal to-85 MPa;
and thirdly, after the second step is finished, adding the residual 20-45% of NMP solvent to carry out slow stirring for 10-30min, and then stirring for 1-1.5h at a revolution speed of 30-40rpm, a dispersion speed of 1200-1800rpm and a vacuum degree of less than or equal to-85 MPa, so as to finish pulping.
The production mode only adopts one stirrer, has the defects of long slurry preparation time, low production efficiency and poor slurry dispersion consistency, has certain limitation, and is necessary to design a new lithium battery material preparation system and a corresponding preparation method in order to improve the production efficiency of the lithium battery material and the material consistency.
Disclosure of Invention
The invention aims to provide a lithium battery material preparation system and a preparation method, which can improve the production efficiency of lithium battery materials and are beneficial to improving the consistency of the lithium battery materials.
In order to achieve the above purpose, the embodiment of the present invention provides the following technical solutions:
a lithium battery material preparation system comprises a powder mixer, a dispersion machine, a first circulating stirring tank, a second circulating stirring tank and a feeding device;
the material input end of the first circulating stirring tank is connected with the output end of the feeding device;
the powder input end of dispenser is connected with the output of powder mixer, and the circulation input end of dispenser is connected with the circulation output of first circulation agitator tank, the circulation output of second circulation agitator tank respectively, and the circulation output end of dispenser is connected with the circulation input of first circulation agitator tank, the circulation input of second circulation agitator tank respectively.
And further, the device comprises a vacuum stirring transfer tank, and a semi-finished product output end of the second circulating stirring tank is connected with a semi-finished product input end of the vacuum stirring transfer tank.
And further, the vacuum stirring transfer tank comprises an iron removal filter, and the finished product output end of the vacuum stirring transfer tank is connected with the input end of the iron removal filter.
Further, the feeding device comprises a first storage tank and a second storage tank;
the output end of the first storage tank is connected with the material input end of the first circulating stirring tank, the material input end of the second circulating stirring tank and the material input end of the vacuum stirring transfer tank respectively, and the output end of the second storage tank is connected with the material input end of the first circulating stirring tank.
Further, the feeding device comprises a feeding pipe, and the output end of the feeding pipe is connected with the material input end of the first circulation stirring tank.
Further, including cooling water circulation system, all be equipped with cooling channel on dispenser, first circulation agitator tank and the second circulation agitator tank, cooling water circulation system's output is connected with cooling channel's input, and cooling water circulation system's circulation input is connected with cooling channel's output.
A preparation method of a lithium battery material comprises the following steps:
premixing conductive rubber powder and liquid slurry: adding conductive adhesive powder into a powder mixer for premixing, conveying the materials in a feeding device into a first circulating stirring tank for stirring to form liquid slurry;
(II) single-cycle stirring: after the conductive adhesive powder in the powder mixer and the liquid slurry in the first circulating stirring tank are completely conveyed to the dispersion machine, the conductive adhesive slurry is circularly conveyed between the dispersion machine and the first circulating stirring tank, the dispersion machine mixes and disperses the conductive adhesive slurry, the first circulating stirring tank stirs the conductive adhesive slurry, the dispersion machine and the first circulating stirring tank form a single circulating line of the conductive adhesive slurry, and the conductive adhesive slurry is conveyed along the dispersion machine and the first circulating stirring tank and is conveyed back into the dispersion machine again from the first circulating stirring tank so as to complete the single circulating line;
(III) premixing electrode powder: after the conductive rubber powder in the powder mixer is completely conveyed to the dispersion machine, adding electrode powder into the powder mixer for premixing;
(IV) double-circulation stirring: the conductive adhesive slurry circulating between the dispersing machine and the first circulating stirring tank is conveyed into the dispersing machine in batches through the first circulating stirring tank, the electrode powder in the powder mixing machine is conveyed into the dispersing machine in batches, and the conductive adhesive slurry and the electrode powder are mixed and dispersed in the dispersing machine to form mixed slurry;
the mixed slurry in the dispersion machine is conveyed into the second circulation agitator tank to be stirred, after the electrode powder of the powder mixing machine and the conductive adhesive slurry of the first circulation agitator tank are completely conveyed to the dispersion machine to be processed and conveyed into the second circulation agitator tank to be stirred, the mixed slurry in the second circulation agitator tank is conveyed into the second circulation agitator tank along the second circulation agitator tank, the dispersion machine, the first circulation agitator tank, the dispersion machine and the conductive adhesive slurry conveyed back into the second circulation agitator tank again from the dispersion machine to complete a double circulation conveying line, the mixed slurry circulating between the double circulation conveying lines is finally conveyed into the second circulation agitator tank, and the mixed slurry is output from the second circulation agitator tank.
The mixed slurry is in the dual-cycle conveying line transportation process, the mixed slurry of the second cycle stirring tank is conveyed to the dispersion machine in batches, the dispersion machine is used for mixing and dispersing the mixed slurry and then conveying the mixed slurry into the first cycle stirring tank to be stirred, until all the mixed slurry in the second cycle stirring tank is processed by the dispersion machine and conveyed into the first cycle stirring tank, the mixed slurry in the first cycle stirring tank is conveyed to the dispersion machine in batches, the dispersion machine is used for mixing and dispersing the mixed slurry again and then conveying the mixed slurry into the second cycle stirring tank to be stirred, and until all the mixed slurry in the first cycle stirring tank is processed by the dispersion machine and conveyed into the second cycle stirring tank, the next dual-cycle conveying line is carried out.
Further, (a) conducting rubber powder premixing and liquid slurry premixing: the rotating speed of the powder mixer is 25-35rpm, the stirring time is 5-15min, the rotating speed of the first circulating stirring tank is 25-35rpm, and the stirring time is 5-15 min;
(II) single-cycle stirring: the time for completely conveying the conductive adhesive powder in the powder mixer to the dispersion machine is 3-5min, the single-cycle stirring time is 15-21min, the cycle number of the conductive adhesive slurry in a single-cycle line is 8-15, the rotating speed of the dispersion machine is 2000-2500rpm, and the rotating speed of the first circulating stirring tank is 25-35 rpm;
(III) premixing electrode powder: the rotating speed of the powder mixer is 25-35rpm, and the stirring time is 5-20 min;
(IV) double-circulation stirring: the time for completely conveying the electrode powder of the powder mixer and the conductive adhesive slurry of the first circulating stirring tank to the dispersion machine is 20-30min, the double-circulating stirring time is 20-30min, the circulation frequency of the mixed slurry in a double-circulating conveying line is 8-12 times, the rotation speed of the dispersion machine is 1200-2000rpm, the rotation speed of the first circulating stirring tank is 25-35rpm, and the rotation speed of the second circulating stirring tank is 25-35 rpm.
Further, the method comprises the following steps:
(V) stirring and defoaming: outputting the mixed slurry in the second circulation stirring tank to a vacuum stirring transfer tank for stirring and vacuum defoaming treatment, wherein the rotating speed of the vacuum stirring transfer tank is 25-35rpm, the vacuum degree in the vacuum stirring transfer tank is lower than-75 kPa, and the treatment time is 30-40 min;
(VI) filtering and discharging: and after the stirring and vacuum defoaming treatment is finished, conveying the mixed slurry in the vacuum stirring transfer tank to an iron removal filter for filtering, and finally outputting the finished mixed slurry by the iron removal filter.
Further, the method comprises the following steps:
(VII) stirring and cooling: and the cooling water circulation system conveys cooling water to the dispersion machine, the first circulating stirring tank and the second circulating stirring tank, the cooling water after heat exchange flows back into the cooling water circulation system again, the outlet water temperature of the cooling water circulation system is 12-16 ℃, and the return water temperature of the cooling water circulation system is 18-23 ℃.
The invention has the beneficial effects that: this lithium battery materials prepares system adopts four mixer equipment, is powder mixer, dispenser, first circulation agitator tank, second circulation agitator tank respectively, is favorable to improving lithium battery materials's production efficiency, and the material can circulate between dispenser and first circulation agitator tank, dispenser and second circulation agitator tank, is favorable to improving stirring materials's mixed effect among the circulation process, is favorable to improving lithium battery materials's uniformity.
Drawings
Fig. 1 is a schematic diagram of a lithium battery material preparation system according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a lithium battery material preparation system according to an embodiment of the present invention.
FIG. 3 is a flow chart of a dispensing method according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.
Referring to fig. 1-2, the lithium battery material preparation system comprises a powder mixer 1, a dispersion machine 2, a first circulating stirring tank 3, a second circulating stirring tank 4 and a feeding device, wherein the powder mixer 1, the dispersion machine 2, the first circulating stirring tank 3 and the second circulating stirring tank 4 all belong to stirring equipment, and the use of four stirring equipment is beneficial to improving the production efficiency of lithium battery materials; the powder mixer 1 is used for respectively realizing premixing of conductive adhesive powder and premixing of electrode powder, the dispersion machine 2 is used for receiving the powder of the powder mixer 1, and materials in the first circulating stirring tank 3 or the second circulating stirring tank 4 are mixed and dispersed, the first circulating stirring tank 3 can also be used for premixing the materials, and the premixing treatment of the powder mixer 1 and the first circulating stirring tank 3 can improve the production efficiency of lithium battery materials.
The material input end of the first circulating stirring tank 3 is connected with the output end of the feeding device;
the powder input of dispenser 2 is connected with the output of powder mixer 1, conductive adhesive powder or the electrode powder that powder mixer 1 mixes in advance can be carried into dispenser 2 in, dispenser 2's circulation input respectively with first circulation agitator tank 3's circulation output, second circulation agitator tank 4's circulation output is connected, dispenser 2's circulation output respectively with first circulation agitator tank 3's circulation input, second circulation agitator tank 4's circulation input is connected, this kind of connected mode makes stirring material can be between dispenser 2 and first circulation agitator tank 3, circulate between dispenser 2 and the second circulation agitator tank 4, the circulation in-process is favorable to improving the stirring mixed effect of material, be favorable to improving lithium battery material's uniformity.
The material can be conveyed in the lithium battery material preparation system by virtue of a pipeline for vacuum adsorption conveying or pump conveying, and the vacuum adsorption conveying and the pump conveying belong to conventional material conveying modes;
specifically, in this embodiment, this lithium battery material preparation system still includes feeder hopper 11, intake pipe and vacuum tube, and there is feeder hopper 11 powder mixer 1's input through the pipe connection, and there is the air pump intake-pipe connection, and the vacuum tube is connected with the aspiration pump.
The first material storage tank 7, the second material storage tank 8, the powder mixer 1, the dispersion machine 2, the first circulating stirring tank 3, the second circulating stirring tank 4 and the vacuum stirring transfer tank 5 are respectively provided with an air inlet port and an air exhaust port, and electric switch valves are respectively arranged on the air inlet ports and the air exhaust ports of the first material storage tank 7, the second material storage tank 8, the powder mixer 1, the dispersion machine 2, the first circulating stirring tank 3, the second circulating stirring tank 4 and the vacuum stirring transfer tank 5;
the vacuum tube is respectively connected with the air exhaust ports of the first storage tank 7, the second storage tank 8, the powder mixer 1, the dispersion machine 2, the first circulating stirring tank 3, the second circulating stirring tank 4 and the vacuum stirring transfer tank 5, the material in the feed hopper 11 can be conveyed to the powder mixer 1 in a vacuum adsorption mode, the material in the first storage tank 7 can be conveyed to the first circulating stirring tank 3, the second circulating stirring tank 4 and the vacuum stirring transfer tank 5 in a vacuum adsorption mode, the material in the second storage tank 8 can be conveyed to the first circulating stirring tank 3 in a vacuum adsorption mode, and the dispersion machine 2, the first circulating stirring tank 3, the second circulating stirring tank 4 and the vacuum stirring transfer tank 5 can be subjected to vacuum pumping stirring;
the intake pipe is connected with the inlet port of first storage tank 7, second storage tank 8, powder mixer 1, dispenser 2, first circulation agitator tank 3, second circulation agitator tank 4, vacuum stirring transfer tank 5 respectively for first storage tank 7, second storage tank 8, powder mixer 1, dispenser 2, first circulation agitator tank 3, second circulation agitator tank 4, vacuum stirring transfer tank 5 resume inside atmospheric pressure.
In an embodiment, including vacuum stirring transfer tank 5, second circulation agitator tank 4 has semi-manufactured goods output, vacuum stirring transfer tank 5 has semi-manufactured goods input, the semi-manufactured goods output of second circulation agitator tank 4 is connected with vacuum stirring transfer tank 5's semi-manufactured goods input, through dispenser 2, first circulation agitator tank 3, the material that second circulation agitator tank 4 handled and accomplished is finally carried to vacuum stirring transfer tank 5 through second circulation agitator tank 4's semi-manufactured goods output, make dispenser 2, first circulation agitator tank 3, second circulation agitator tank 4 can carry out the processing of next batch of material, reduce dispenser 2, first circulation agitator tank 3, second circulation agitator tank 4's idle time, vacuum stirring transfer tank 5 carries out the vacuum mixing defoaming to the material and handles.
In an embodiment, including deironing filter 6, deironing filter 6 has the input, and vacuum stirring transfer tank 5 has the finished product output, and the finished product output of vacuum stirring transfer tank 5 is connected with deironing filter 6's input, and the material after the completion of vacuum stirring defoaming treatment of vacuum stirring transfer tank 5 is carried to deironing filter 6, and the final output is realized after the filtration processing of deironing filter 6 to the material.
Referring to fig. 1, in this embodiment, the feeding device includes a first storage tank 7 and a second storage tank 8, and the first storage tank 7 and the second storage tank 8 are respectively used for storing different materials;
the output end of the first material storage tank 7 is connected with the material input end of the first circulating stirring tank 3;
the output end of the first material storage tank 7 is also respectively connected with the material input end of the second circulating stirring tank 4 and the material input end of the vacuum stirring transfer tank 5;
the output end of the second material storage tank 8 is connected with the material input end of the first circulating stirring tank 3.
Referring to fig. 2, in this embodiment, the feeding device comprises a feeding pipe 9, and the feeding device further comprises a first storage tank 7, i.e. the feeding device does not have a second storage tank 8, and the material with a smaller amount does not need to be loaded by using the storage tank, and the feeding pipe 9 is directly inserted into the original tank of the material.
The output end of the feeding pipe 9 is connected with the material input end of the first circulation stirring tank 3.
The output end of the first material storage tank 7, the output end of the second material storage tank 8, the feeding pipe 9, the circulating input end of the dispersion machine 2, the semi-finished product output end of the second circulating stirring tank 4 and the finished product output end of the vacuum stirring transfer tank 5 are all provided with a driving pump, and the driving pumps are used for conveying materials;
the input of powder mixer 1, the output of powder mixer 1, the circulation output of dispenser 2, the circulation input of first circulation agitator tank 3, the circulation output of first circulation agitator tank 3, the circulation input of second circulation agitator tank 4, the circulation output of second circulation agitator tank 4, the semi-manufactured goods input of vacuum stirring transfer tank 5, all be equipped with electric switch valve on the finished product output of vacuum stirring transfer tank 5.
In an embodiment, including cooling water circulation system 10, cooling water circulation system 10 can adopt the cooling pond, the open-type cooling water circulation system of cooling tower structure, dispenser 2, all be equipped with cooling channel on first circulation agitator tank 3 and the second circulation agitator tank 4, cooling water circulation system 10's output is connected with cooling channel's input, cooling water circulation system 10's circulation input end is connected with cooling channel's output, dispenser 2 is avoided in cooling water circulation system 10's use, overheated when first circulation agitator tank 3 and the stirring of second circulation agitator tank 4 are moved, dispenser 2, all be equipped with the electric switch valve on the cooling channel output of first circulation agitator tank 3 and second circulation agitator tank 4 and the input.
Referring to fig. 1-3, the lithium battery material preparation method, the positive electrode material and the negative electrode material of the lithium battery both adopt the same preparation method, and the method comprises the following steps:
premixing conductive rubber powder and liquid slurry: add the conducting resin powder in mixing the machine 1 to the powder and mix in advance, the material in the feedway is carried and is stirred and form liquid thick liquids in first circulation agitator tank 3, and the premixing of mixing the machine 1 with first circulation agitator tank 3 is handled and is favorable to improving lithium battery material's production efficiency and the final uniformity of lithium battery material.
(II) single-cycle stirring: conductive adhesive powder in the powder mixer 1 and liquid slurry in the first circulating stirring tank 3 are conveyed into the dispersing machine 2 to be mixed and dispersed to form conductive adhesive slurry, after the conductive adhesive powder in the powder mixer 1 is completely conveyed to the dispersing machine 2, the conductive adhesive slurry is circularly conveyed between the dispersing machine 2 and the first circulating stirring tank 3, the dispersing machine 2 mixes and disperses the conductive adhesive slurry, the first circulating stirring tank 3 stirs the conductive adhesive slurry, the dispersing machine 2 and the first circulating stirring tank 3 form a single circulating line of the conductive adhesive slurry, the conductive adhesive slurry is conveyed along the dispersing machine 2 and the first circulating stirring tank 3 and is conveyed back into the dispersing machine 2 from the first circulating stirring tank 3 again to complete the single circulating line once, the conductive adhesive slurry is transferred between the dispersing machine 2 and the first circulating stirring tank 3 in a single circulating stirring mode, and the mixing effect of the conductive adhesive slurry is improved, the final consistency of the lithium battery material is facilitated.
(III) premixing electrode powder: after the conductive adhesive powder in the powder mixer 1 is completely conveyed to the dispersion machine 2, the electrode powder is added into the powder mixer 1 for premixing, so that the idle time of the powder mixer 1 is reduced, and the production efficiency of the lithium battery material is improved.
(IV) double-circulation stirring: the conductive adhesive slurry circulating between the dispersion machine 2 and the first circulating stirring tank 3 is conveyed into the dispersion machine 2 in batches finally through the first circulating stirring tank 3, the electrode powder in the powder mixing machine 1 is conveyed into the dispersion machine 2 in batches, the conductive adhesive slurry and the electrode powder are mixed and dispersed in the dispersion machine 2 to form mixed slurry, the volume numerical values of the first circulating stirring tank 3 and the second circulating stirring tank 4 are far larger than the processing volume numerical value of the dispersion machine 2, if the volumes of the first circulating stirring tank 3 and the second circulating stirring tank 4 are both 500L, the processing volume of the dispersion machine 2 is 50L, and the conductive adhesive slurry and the electrode powder can only be conveyed into the dispersion machine 2 in batches for processing;
the mixed slurry in the dispersing machine 2 is conveyed into a second circulating stirring tank 4 for stirring, the second circulating stirring tank 4 has the function of temporarily storing the mixed slurry, at the moment, the mixed slurry does not need to return into the first circulating stirring tank 3 to be mixed with the slurry which is not further processed by the dispersing machine 2, after the electrode powder of the powder mixing machine 1 and the conductive adhesive slurry in the first circulating stirring tank 3 are completely conveyed to the dispersing machine 2 for processing and conveyed into the second circulating stirring tank 4 for stirring, the mixed slurry in the second circulating stirring tank 4 is conveyed back into the second circulating stirring tank 4 along the second circulating stirring tank 4, the dispersing machine 2, the first circulating stirring tank 3 and the dispersing machine 2 from the dispersing machine 2 again to finish a one-time double-circulation conveying line, and the mode is favorable for improving the mixing effect of the materials and for the final consistency of the lithium battery materials;
the mixed slurry circulated between the two-circulation transfer lines is finally transferred into the second-circulation agitation tank 4, and the mixed slurry is discharged from the second-circulation agitation tank 4.
During the conveying process of the mixed slurry in the double-circulation conveying line, the mixed slurry in the second circulation stirring tank 4 is conveyed to the dispersing machine 2 in batches, the dispersing machine 2 mixes and disperses the mixed slurry and then conveys the mixed slurry into the first circulation stirring tank 3 for stirring, at the moment, the first circulation stirring tank 3 also has the function of temporarily storing the mixed slurry, the mixed slurry does not need to return to the second circulation stirring tank 4 to be mixed with the slurry which is not further processed by the dispersing machine 2 until all the mixed slurry in the second circulation stirring tank 4 is processed by the dispersing machine 2 and conveyed into the first circulation stirring tank 3, the mixed slurry in the first circulation stirring tank 3 starts to be conveyed to the dispersing machine 2 in batches, the dispersing machine 2 carries out mixing and dispersion again on the mixed slurry and then conveys the mixed slurry into the second circulation stirring tank 4 for stirring until all the mixed slurry in the first circulation stirring tank 3 is processed by the dispersing machine 2 and conveyed into the second circulation stirring tank 4, and then the next double circulation conveying line is carried out.
Compared with the total material quantity of the electrode powder and the conductive adhesive slurry in the step (four), when the step (two) is carried out single-cycle stirring, the total material quantity of the conductive adhesive powder in the powder mixer 1 and the total material quantity of the liquid slurry in the first cycle stirring tank 3 are less, the viscosity of the conductive adhesive slurry prepared in the step (two) is larger, the fluidity is poor, even if the conductive adhesive slurry only circulates between the dispersion machine 2 and the first cycle stirring tank 3, the confusion effect is limited when the conductive adhesive slurry further processed by the dispersion machine 2 is sent into the first cycle stirring tank 3 to be contacted with the conductive adhesive slurry not further processed by the dispersion machine 2, the influence on the uniform dispersion of the conductive adhesive slurry is limited, and the conductive adhesive slurry does not need to be temporarily stored in the second cycle stirring tank 4.
In this embodiment, the steps (a), (b), (c), (d) and (d) are performed in sequence, and the step (b) and the step (c) can be operated cooperatively;
referring to fig. 1, for a schematic structural diagram of a lithium battery material preparation system when preparing a positive electrode material, the materials required to be used for preparing the positive electrode material of a lithium battery are as follows in parts by weight:
premixing conductive rubber powder and liquid slurry:
the conductive adhesive powder is premixed, and the conductive adhesive powder added into the powder mixer 1 comprises:
0-2 parts of conductive carbon black;
PVDF (polyvinylidene fluoride), 0.8-2 parts.
The liquid slurry is premixed, and the material supplied to the first circulation stirring tank 3 by the supply device comprises:
NMP (N-methyl pyrrolidone solvent) 30-50 parts;
0.5-2 parts of CNT (carbon nano tube conductive paste);
NMP is stored in a first storage tank 7 of the feeding device and CNTs are stored in a second storage tank 8 of the feeding device.
(III) premixing electrode powder:
the electrode powder added to the powder mixer 1 includes:
93-98 parts of one or the combination of more than two of LCO (lithium cobaltate), NCM (nickel cobalt manganese), LMO (lithium manganate) and LFP (lithium iron phosphate).
Referring to fig. 2, a schematic structural diagram of a lithium battery material preparation system for preparing a negative electrode material is shown, where the negative electrode material of a lithium battery is prepared by using the following materials in parts by weight:
premixing conductive rubber powder and liquid slurry:
the conductive adhesive powder is premixed, and the conductive adhesive powder added into the powder mixer 1 comprises:
CMC (carboxymethyl cellulose), 0.8-2;
SP (superfine carbon powder), 0-2 parts;
0.5-2 parts of CNT (carbon nano tube).
The liquid slurry is premixed, and the material supplied to the first circulation stirring tank 3 by the supply device comprises:
45-55 parts of deionized water;
SBR (styrene butadiene rubber) 0.8-2 parts;
deionized water is stored in the first storage tank 7 of the feeding device, and SBR is stored in its own original tank and is fed through the feed pipe 9.
(III) premixing electrode powder:
the electrode powder added to the powder mixer 1 includes:
91-95 parts of one or the combination of more than two of artificial graphite, natural graphite, composite graphite and corresponding mesophase.
Premixing conductive rubber powder and liquid slurry: the rotating speed of the powder mixer 1 is 25-35rpm, the stirring time is 5-15min, the rotating speed of the first circulating stirring tank 3 is 25-35rpm, and the stirring time is 5-15 min;
(II) single-cycle stirring: the time for completely conveying the conductive adhesive powder in the powder mixer 1 to the dispersion machine 2 is 3-5min, the single-cycle stirring time is 15-21min, the cycle number of the conductive adhesive slurry in a single-cycle line is 8-15, the rotating speed of the dispersion machine 2 is 2000-2500rpm, and the rotating speed of the first cycle stirring tank 3 is 25-35 rpm;
(III) premixing electrode powder: the rotating speed of the powder mixer 1 is 25-35rpm, and the stirring time is 5-20 min;
(IV) double-circulation stirring: the time for completely conveying the electrode powder of the powder mixer 1 and the conductive adhesive slurry of the first circulation stirring tank 3 to the dispersion machine 2 is 20-30min, the double circulation stirring time is 20-30min, the circulation frequency of the mixed slurry in a double circulation conveying line is 8-12 times, the rotation speed of the dispersion machine 2 is 1200-2000rpm, the rotation speed of the first circulation stirring tank 3 is 25-35rpm, and the rotation speed of the second circulation stirring tank 4 is 25-35 rpm.
The preparation method of the lithium battery material has short time and is beneficial to improving the production efficiency of the lithium battery material.
In one embodiment, the method comprises the following steps:
(V) stirring and defoaming: the mixed thick liquids in the second circulation agitator tank 4 are exported and are stirred and vacuum defoaming is handled in 5 vacuum stirring transfer tanks, through dispenser 2, first circulation agitator tank 3, the mixed thick liquids that second circulation agitator tank 4 was handled and is accomplished are shifted to vacuum stirring transfer tank 5 and are further handled, make dispenser 2, first circulation agitator tank 3, second circulation agitator tank 4 can carry out the processing of next batch of material, reduce corresponding idle time, be favorable to improving lithium battery material's production efficiency.
The rotating speed of the vacuum stirring transfer tank 5 is 25-35rpm, the vacuum degree in the vacuum stirring transfer tank 5 is lower than-75 kPa, and the processing time is 30-40 min;
(VI) filtering and discharging: after the stirring and vacuum defoaming treatment is finished, the mixed slurry in the vacuum stirring transfer tank 5 is conveyed to the iron removal filter 6 for filtering, and the iron removal filter 6 finally outputs the finished mixed slurry.
In this embodiment, the steps (a), (b), (c), (d), and (e) are performed sequentially, and the step (b) and the step (d) can be operated cooperatively;
in one embodiment, the method comprises the following steps:
(VII) stirring and cooling: the cooling water circulation system 10 conveys cooling water to the dispersion machine 2, the first circulation stirring tank 3 and the second circulation stirring tank 4, the cooling water after heat exchange flows back into the cooling water circulation system 10 again, the outlet water temperature of the cooling water circulation system 10 is 12-16 ℃, and the return water temperature of the cooling water circulation system 10 is 18-23 ℃.
Step (seven) may be performed before the dispersion machine 2, the first circulation agitation tank 3, and the second circulation agitation tank 4 operate, and the step (seven) is always performed during the operation of the dispersion machine 2, the first circulation agitation tank 3, and the second circulation agitation tank 4, and in this embodiment, the step (seven) is already performed before the step (one) and is maintained in an execution state according to the operation of the dispersion machine 2, the first circulation agitation tank 3, and the second circulation agitation tank 4.
The foregoing is a preferred embodiment of the present invention, and the basic principles, principal features and advantages of the invention are shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (10)
1. A lithium battery material preparation system is characterized by comprising a powder mixer (1), a dispersion machine (2), a first circulating stirring tank (3), a second circulating stirring tank (4) and a feeding device;
the material input end of the first circulating stirring tank (3) is connected with the output end of the feeding device;
the powder input end of dispenser (2) is connected with the output of powder mixer (1), and the circulation input end of dispenser (2) is connected with the circulation output of first circulation agitator tank (3), the circulation output of second circulation agitator tank (4) respectively, and the circulation output end of dispenser (2) is connected with the circulation input of first circulation agitator tank (3), the circulation input of second circulation agitator tank (4) respectively.
2. The lithium battery material preparation system according to claim 1, wherein the system comprises a vacuum stirring transfer tank (5), and the semi-finished product output end of the second circulation stirring tank (4) is connected with the semi-finished product input end of the vacuum stirring transfer tank (5).
3. The lithium battery material preparation system according to claim 2, wherein the system comprises an iron removal filter (6), and the finished product output end of the vacuum stirring transit tank (5) is connected with the input end of the iron removal filter (6).
4. The lithium battery material preparation system according to claim 2, wherein the feeding device comprises a first storage tank (7) and a second storage tank (8);
the output end of the first storage tank (7) is connected with the material input end of the first circulating stirring tank (3), the material input end of the second circulating stirring tank (4) and the material input end of the vacuum stirring transfer tank (5) respectively, and the output end of the second storage tank (8) is connected with the material input end of the first circulating stirring tank (3).
5. The lithium battery material preparation system according to claim 2, wherein the feeding device comprises a feeding pipe (9), and an output end of the feeding pipe (9) is connected with a material input end of the first circulation stirring tank (3).
6. The lithium battery material preparation system according to claim 1, wherein a cooling water circulation system (10) is included, the dispersion machine (2), the first circulation stirring tank (3) and the second circulation stirring tank (4) are respectively provided with a cooling channel, an output end of the cooling water circulation system (10) is connected with an input end of the cooling channel, and a circulation input end of the cooling water circulation system (10) is connected with an output end of the cooling channel.
7. A preparation method of a lithium battery material is characterized by comprising the following steps:
premixing conductive rubber powder and liquid slurry: adding conductive adhesive powder into the powder mixer (1) for premixing, conveying the materials in the feeding device into a first circulating stirring tank (3) for stirring to form liquid slurry;
(II) single-cycle stirring: conductive adhesive powder in the powder mixer (1) and liquid slurry in the first circulating stirring tank (3) are conveyed into the dispersion machine (2) to be mixed and dispersed to form conductive adhesive slurry, after the conductive adhesive powder in the powder mixer (1) is completely conveyed to the dispersion machine (2), the conductive adhesive slurry is circularly conveyed between the dispersion machine (2) and the first circulating stirring tank (3), the conductive adhesive slurry is mixed and dispersed by the dispersion machine (2), the conductive adhesive slurry is stirred by the first circulating stirring tank (3), the dispersion machine (2) and the first circulating stirring tank (3) form a single circulating line of the conductive adhesive slurry, and the conductive adhesive slurry is conveyed along the dispersion machine (2) and the first circulating stirring tank (3) and conveyed back into the dispersion machine (2) from the first circulating stirring tank (3) again to complete a single circulating line;
(III) premixing electrode powder: after the conductive adhesive powder in the powder mixer (1) is completely conveyed to the dispersion machine (2), adding electrode powder into the powder mixer (1) for premixing;
(IV) double-circulation stirring: the conductive adhesive slurry circulating between the dispersion machine (2) and the first circulating stirring tank (3) is conveyed into the dispersion machine (2) in batches through the first circulating stirring tank (3), the electrode powder in the powder mixing machine (1) is conveyed into the dispersion machine (2) in batches, and the conductive adhesive slurry and the electrode powder are mixed and dispersed in the dispersion machine (2) to form mixed slurry;
conveying the mixed slurry in the dispersion machine (2) into a second circulating stirring tank (4) for stirring, after the electrode powder of the powder mixing machine (1) and the conductive adhesive slurry in the first circulating stirring tank (3) are completely conveyed to the dispersion machine (2) for treatment and conveyed into the second circulating stirring tank (4) for stirring, conveying the mixed slurry in the second circulating stirring tank (4) back into the second circulating stirring tank (4) along the second circulating stirring tank (4), the dispersion machine (2), the first circulating stirring tank (3), the dispersion machine (2) and the self-dispersion machine (2) again to finish a primary double-circulating conveying line, finally conveying the mixed slurry circulating between the double-circulating conveying lines into the second circulating stirring tank (4), and outputting the mixed slurry from the second circulating stirring tank (4);
during the conveying process of the mixed slurry in the double-circulation conveying line, the mixed slurry in the second circulation stirring tank (4) is conveyed to the dispersing machine (2) in batches, the dispersing machine (2) is used for mixing and dispersing the mixed slurry and then conveying the mixed slurry into the first circulation stirring tank (3) for stirring until all the mixed slurry in the second circulation stirring tank (4) is treated by the dispersing machine (2) and conveyed into the first circulation stirring tank (3), and the mixed slurry in the first circulating stirring tank (3) is conveyed to the dispersing machine (2) in batches, the dispersing machine (2) is used for mixing and dispersing the mixed slurry again and then conveying the mixed slurry into the second circulating stirring tank (4) for stirring until all the mixed slurry in the first circulating stirring tank (3) is treated by the dispersing machine (2) and conveyed into the second circulating stirring tank (4), and then the next double-circulating conveying line is carried out.
8. The method for formulating a lithium battery material as claimed in claim 8, wherein:
premixing conductive rubber powder and liquid slurry: the rotating speed of the powder mixer (1) is 25-35rpm, the stirring time is 5-15min, the rotating speed of the first circulating stirring tank (3) is 25-35rpm, and the stirring time is 5-15 min;
(II) single-cycle stirring: the time for completely conveying the conductive adhesive powder in the powder mixer (1) to the dispersion machine (2) is 3-5min, the single-cycle stirring time is 15-21min, the cycle number of the conductive adhesive slurry in a single-cycle line is 8-15, the rotating speed of the dispersion machine (2) is 2000-2500rpm, and the rotating speed of the first cycle stirring tank (3) is 25-35 rpm;
(III) premixing electrode powder: the rotating speed of the powder mixer (1) is 25-35rpm, and the stirring time is 5-20 min;
(IV) double-circulation stirring: the time for completely conveying the electrode powder of the powder mixer (1) and the conductive adhesive slurry of the first circulating stirring tank (3) to the dispersion machine (2) is 20-30min, the double-circulating stirring time is 20-30min, the circulation frequency of the mixed slurry in a double-circulating conveying line is 8-12 times, the rotation speed of the dispersion machine (2) is 1200-2000rpm, the rotation speed of the first circulating stirring tank (3) is 25-35rpm, and the rotation speed of the second circulating stirring tank (4) is 25-35 rpm.
9. The method for formulating a lithium battery material as recited in claim 8, comprising the steps of:
(V) stirring and defoaming: outputting the mixed slurry in the second circulating stirring tank (4) to a vacuum stirring transfer tank (5) for stirring and vacuum defoaming treatment, wherein the rotating speed of the vacuum stirring transfer tank (5) is 25-35rpm, the vacuum degree in the vacuum stirring transfer tank (5) is lower than-75 kPa, and the treatment time is 30-40 min;
(VI) filtering and discharging: after the stirring and vacuum defoaming treatment is finished, the mixed slurry in the vacuum stirring transfer tank (5) is conveyed to an iron removal filter (6) for filtering, and the iron removal filter (6) finally outputs the finished mixed slurry.
10. The method for formulating a lithium battery material as claimed in claim 8, wherein: the method comprises the following steps:
(VII) stirring and cooling: the cooling water circulation system (10) conveys cooling water to the dispersion machine (2), the first circulation stirring tank (3) and the second circulation stirring tank (4), the cooling water after heat exchange flows back into the cooling water circulation system (10) again, the water outlet temperature of the cooling water circulation system (10) is 12-16 ℃, and the water return temperature of the cooling water circulation system (10) is 18-23 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114939356A (en) * | 2022-06-24 | 2022-08-26 | 三一技术装备有限公司 | Homogenate equipment, pulping system and battery production system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114939356A (en) * | 2022-06-24 | 2022-08-26 | 三一技术装备有限公司 | Homogenate equipment, pulping system and battery production system |
| CN114939356B (en) * | 2022-06-24 | 2024-04-19 | 三一技术装备有限公司 | Homogenizing equipment, pulping system and battery production system |
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