KR20240043616A - Continuous lithium sulfide synthesis reactor using reheat steam for all-solid-state batteries - Google Patents

Abstract

A continuous lithium sulfide synthesis reactor using reheated steam for an all-solid-state battery is disclosed. The continuous lithium sulfide synthesis reactor using reheated steam for an all-solid-state battery according to the present invention includes a reaction unit in which lithium hydroxide, hydrogen sulfide (H ₂ S), and a solvent are supplied and heated to synthesize lithium sulfide (Li ₂ S); A drying unit where lithium sulfide synthesized in the reaction unit is supplied and dried; and a reheat steam supply unit that supplies reheat steam to the second drying unit and the reaction unit to heat the second drying unit and the reaction unit.

Description

Continuous lithium sulfide synthesis reactor using reheat steam for all-solid-state batteries}

The present invention relates to a continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery.

Recently, the need for lithium sulfide as a raw material for solid electrolytes for all-solid-state lithium secondary batteries has increased, and it is used as a raw material in various fields.

All-solid lithium secondary batteries are a form in which the organic liquid electrolyte and separator in currently commercialized lithium secondary batteries are replaced with solid electrolytes. Solid electrolytes have non-flammable or flame-retardant properties, so they are safer than liquid electrolytes.

Solid electrolytes are divided into oxide-based and sulfide-based. Sulfide-based solid electrolytes are mainly used because they have higher lithium ion conductivity and are stable over a wide voltage range compared to oxide-based solid electrolytes.

Since lithium sulfide does not exist as a natural mineral product, it is obtained by synthesis from other lithium compounds. In general, lithium sulfide can be produced by producing lithium hydroxide as a lithium source. For example, the lithium sulfide production method involves producing lithium sulfide by reacting a solid lithium source (for example, lithium hydroxide (LiOH), etc.) with a gaseous sulfur source (for example, hydrogen sulfide (H ₂ S), etc.). Many methods are used.

However, conventional lithium sulfide powder has poor electrochemical performance due to a significant potential barrier during the charging process, but nano-sized lithium sulfide effectively reduces the charging barrier, so a method for synthesizing nano-sized lithium sulfide is required.

In addition, the conventional method for producing lithium sulfide consists of a very complex process to prevent hydrolysis and isolate it from the atmosphere, so it is possible to continuously produce lithium sulfide in a simple but large scale to reduce the manufacturing cost of lithium sulfide for all-solid-state batteries. The development of a continuous lithium sulfide synthesis reactor using reheated steam is necessary.

[Document 1] Japanese Patent Publication No. 9-278423

Therefore, the technical problem to be solved by the present invention is to provide a continuous lithium sulfide synthesis reactor using reheated steam for an all-solid-state battery that can synthesize nano-sized lithium sulfide and can also produce simple and large-scale lithium sulfide continuously. will be.

According to one aspect of the present invention, a reaction unit to which lithium hydroxide, hydrogen sulfide (H ₂ S) and a solvent are supplied and heated to synthesize lithium sulfide (Li ₂ S); a drying unit where the lithium sulfide synthesized in the reaction unit is supplied and dried; And a continuous lithium sulfide synthesis reactor using reheated steam for an all-solid-state battery, which is heated by supplying reheated steam to a drying unit and the reaction unit, can be provided.

The drying unit includes a second main body to which the lithium sulfide is supplied; at least one baffle plate provided inside the main body to move the lithium sulfide, and to pull the lithium sulfide upward and then fall downward as the main body rotates; and a driving unit that rotates the main body, and may further include a jacket unit disposed to surround the main body.

The reaction unit includes a reactor in which the lithium hydroxide, hydrogen sulfide, and the solvent are supplied, mixed with each other to generate a mixed solution, and synthesize the lithium sulfide; A plurality of beads provided inside the reactor to control the particle size of the lithium sulfide; At least one partition protrudes from the inner wall of the reactor and improves the reactivity of the mixed solution and the pulverization of lithium sulfide as the reactor rotates; a screen provided at the outlet of the reactor to prevent the beads from being discharged; And it may include a third driving unit that rotates the reactor.

The moisture content of the lithium sulfide discharged from the drying unit may be 1% by weight or less.

It further includes a second jacket unit disposed to surround the reactor, and supplies reheat steam discharged from the first jacket unit to the second jacket unit to heat the reactor, thereby indirectly heating the mixed solution and the lithium sulfide. and can be discharged from the second jacket unit.

The reheat steam supplied from the first jacket unit to the second jacket unit has a temperature of 300 to 350° C. and can be recovered from the second jacket unit to the reheat steam supply unit.

It further includes a cyclone for recovering the lithium hydroxide contained in the vapor discharged from the first body, wherein the lithium hydroxide recovered from the cyclone is re-supplied to the first body, and the lithium hydroxide recovered from the cyclone is re-supplied to the first body. The steam supplied to the reheat steam supply unit may be 150 to 200°C.

Among the steam discharged from the cyclone, it may further include a discharge unit for discharging excess steam by the amount of steam increased in the process of drying the lithium hydroxide in the first body portion and supplying the steam to the reheat steam supply unit.

It further includes a lithium sulfide storage unit in which the lithium sulfide dried and discharged from the drying unit is stored, and the solvent in addition to the lithium sulfide dried and discharged from the drying unit can be recovered to the solvent supply unit.

It further includes a separation unit provided between the drying unit and the reaction unit to separate the solvent from the lithium sulfide and the solvent supplied from the reaction unit to the drying unit, and the solvent separated in the separation unit is It can be recovered into the solvent supply unit.

Embodiments of the present invention can synthesize nano-sized lithium sulfide, and can also produce simple yet large-scale lithium sulfide continuously.

In addition, the embodiment of the present invention can achieve maximum drying effect with minimum energy by using reheat steam for lithium hydroxide as raw material and lithium sulfide as product, thereby saving energy.

In addition, an embodiment of the present invention improves the direct solid-gas reactivity by performing a wet grinding synthesis process in a reaction unit, and at the same time, the particle size of lithium sulfide can be adjusted to nano size, making it possible to establish a commercial synthesis process.

In addition, nano-sized lithium sulfide produced in an embodiment of the present invention is used as a raw material for an all-solid-state battery, and is easy to charge and discharge due to improved electrochemical performance.

In addition, embodiments of the present invention enable an eco-friendly lithium sulfide production process by applying various solvents during synthesis.

Figure 1 is a configuration diagram schematically showing a continuous production system for lithium sulfide used in a solid electrolyte using reheat steam according to the present invention.
Figure 2 is a front view showing a reheat steam injection unit according to the present invention.
Figure 3 is a side cross-sectional view showing the reheat steam injection unit according to the present invention.
Figures 4 and 5 are diagrams showing the operating state of the reaction unit according to the present invention.
Figure 6 is a side cross-sectional view showing the second drying unit according to the present invention.
Figure 7 is a front view showing a second drying unit according to the present invention.

In order to fully understand the present invention, its operational advantages, and the objectives achieved by practicing the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the attached drawings. The same reference numerals in each drawing indicate the same member.

Figure 1 is a schematic configuration diagram showing a system including a reactor for continuous production of lithium sulfide used in a solid electrolyte using reheat steam according to the present invention, Figure 2 is a front view showing a reheat steam injection unit according to the present invention, Figure 3 is a side cross-sectional view showing the reheat steam injection unit according to the present invention, Figures 4 and 5 are operation state diagrams of the reaction unit according to the present invention, Figure 6 is a side cross-sectional view showing the second drying unit according to the present invention, Figures 7 is a front view showing the second drying unit according to the present invention.

Referring to Figures 1 to 7, in the continuous production system 100 of lithium sulfide used in a solid electrolyte using reheat steam according to the present invention, pulverized lithium hydroxide, hydrogen sulfide (H ₂ S), and a solvent are supplied and heated. A reaction unit 130 that synthesizes lithium sulfide (Li2S), a drying unit 150 in which the lithium sulfide synthesized in the reaction unit 130 is supplied and dried, a second drying unit 150, and a reaction unit 130. It includes a reheat steam supply unit 160 that supplies reheat steam to heat it.

Referring to Figures 2 and 3, the reheat steam injection unit 117 includes a reheat steam supply unit 117a having a plurality of reheat steam flow paths to which a reheat steam nozzle 117f is coupled at one end, and a reheat steam nozzle 117f. ) includes a reheat steam injection plate (117b) formed by being introduced, and a reheat steam main nozzle (117c) coupled to the reheat steam flow path and formed on the central axis of the reheat steam injection plate (117b).

In addition, the reheat steam injection unit 117 includes a reheat steam curved member 117d that guides the reheat steam to be sprayed to the center of the first body 111 along the end circumference of the reheat steam injection plate 117b, and a reheat steam It may further include a reheat steam vortex forming member 117e formed between the curved member 117d and the end of the reheat steam injection plate 117b to induce a vortex flow in the injected reheat steam.

The spray pressure of the nozzle is preferably between 100mmH ₂ O and 500mmH ₂ O. This injects high-pressure reheat steam directly onto the lithium hydroxide introduced into the first main body 111. Small particles and dust generated at this time are scattered and discharged to the cyclone 180, so they must be used by changing to low-pressure reheat steam. Because it does.

And the lithium hydroxide introduced into the first main body 111 can be indirectly heated and dried. To this end, the present embodiment further includes a first body portion 111 and a first jacket unit 170 disposed to surround the second body portion 151 of the second drying unit 150, which will be described later.

The first jacket unit 170 surrounds the first body 111 and the second body 151 and forms a heating space between the outer walls of the first body 111 and the second body 151. A first housing (not shown), a first inlet (not shown) provided at the upper part of the first housing through which reheat steam supplied from the reheat steam supply unit 160 flows, and a first inlet (not shown) provided at the lower part of the first housing. 1 It is disposed opposite to the inlet and includes a first outlet (not shown) through which reheated steam passing through the heating space is discharged.

A plurality of spray nozzles (not shown) are provided in the heating space between the first body 111 and the second body 151 and the first housing in the longitudinal direction of the first body 111 and the second body 151. ) may be installed at least one reheat steam injection pipe (not shown). The reheat steam supplied from the reheat steam supply unit 160 is supplied to the reheat steam injection pipe through the first inlet and then is injected into the heating space from a plurality of injection nozzles. The reheat steam sprayed into the interior of the first housing from the plurality of injection nozzles may be at a temperature of 550 to 600°C.

The reheat steam supplied from the reheat steam supply unit 160 flows in through the first inlet, is injected through the reheat steam injection pipe, passes through the heating space provided inside the first housing, and then passes through the first outlet provided at the bottom of the first housing. is discharged through

When the reheat steam heats the heating space of the first housing and heats the outer surface of the first body 111 and the second powder portion, the internal temperature of the first body 111 and the second body 151 is increased by heat transfer. is raised and the lithium hydroxide introduced into the first body 111 and the lithium sulfide introduced into the second body 151 are indirectly heated and dried.

The lithium hydroxide introduced into the first body 111 is directly heated and dried by the reheat steam injection unit 117 and indirectly heated and dried by the reheat steam supplied to the first jacket unit 170. In this embodiment, the moisture content of lithium hydroxide dried and discharged from the first body portion 111 is 0.0001 to 1% by weight (wt%).

In this embodiment, reheat steam is directly sprayed on the lithium hydroxide introduced into the first body 111 to improve drying efficiency, and the reheat steam is supplied to the first jacket unit 170 to dry the first body 111. It increases the drying efficiency of the lithium hydroxide introduced inside and circulates only clean vapor. In addition, reheat steam is supplied to the first jacket unit 170 to dry the lithium hydroxide introduced into the first body 111 and the lithium sulfide introduced into the second body 151 in one form. Can be integrated into a jacket unit.

And the reheat steam discharged from the first outlet is supplied and circulated to the second jacket unit 175 surrounding the reaction unit 130, which will be described later. The reheat steam discharged from the first outlet and supplied to the second jacket unit 175 may have a temperature of 300 to 350°C.

The grinding unit 120 according to this embodiment serves to grind the lithium hydroxide that is heated, dried, and discharged from the first body portion 111.

The grinding unit 120 includes a grinder (not shown) that grinds lithium hydroxide, and in the grinding unit 120, the lithium hydroxide can be grinded to 100 nm to 100 ㎛. This is to improve the reaction rate in synthesizing lithium sulfide in the reaction unit 130 and to enable the particle size of the synthesized lithium sulfide to be adjusted to nano size.

If the lithium hydroxide pulverized in the pulverizing unit 120 exceeds the average particle size standard, the pulverized lithium hydroxide can be separated according to predetermined particle size conditions so that it can be re-supplied to the pulverizer and pulverized. Meanwhile, the lithium hydroxide pulverized in the pulverizing unit 120 is supplied to the reaction unit 130.

The reaction unit 130 according to this embodiment serves to synthesize lithium sulfide (Li ₂ S) by receiving lithium hydroxide, hydrogen sulfide (H ₂ S), and a solvent. Lithium hydroxide is supplied from the grinding unit 120, hydrogen sulfide is supplied from the hydrogen sulfide supply unit 193, and the solvent is supplied from the solvent supply unit 195. Additionally, the solvent supply unit 195 may additionally supply a catalyst to the reaction unit 130. That is, a solvent may be supplied from the solvent supply unit 195 to the reaction unit 130, or a solvent and a catalyst may be supplied.

The reaction unit 130 performs a wet grinding synthesis process to improve direct solid-gas reactivity and at the same time adjust the particle size of lithium sulfide to nano size.

Referring to Figures 4 and 5, the reaction unit 130 is a reactor 131 in which lithium hydroxide, hydrogen sulfide, and a solvent are supplied, a catalyst is selectively supplied, and they are mixed together to produce a mixed solution and synthesize lithium sulfide, and a reactor ( 131), a plurality of beads 137 are provided to control the particle size of lithium sulfide, and they are provided to protrude from the inner wall of the reactor 131 and determine the reactivity of the mixed solution and the pulverization of lithium sulfide according to the rotation of the reactor 131. It includes at least one partition wall 133 that promotes, a screen provided on the outlet side of the reactor 131 to prevent the beads 137 from being discharged, and a third driving unit 135 that rotates the reactor 131. .

As shown in FIG. 4, lithium hydroxide, hydrogen sulfide, and a solvent are supplied inside the reactor 131 and mixed with each other to generate a mixed solution. Additionally, lithium hydroxide, hydrogen sulfide, solvent, and catalyst may be supplied and mixed with each other to create a mixed solution inside the reactor 131. And the reactor 131 is heated by the second jacket unit 175, which will be described later, and provides a space for synthesizing lithium sulfide.

In addition, a plurality of beads 137 are provided inside the reactor 131 so that the particle size of lithium sulfide can be nano-sized. Any bead 137 can be used as long as it does not react when lithium hydroxide and hydrogen sulfide react to produce lithium sulfide.

The third driving unit 135 includes a roller that is in close contact with the outer wall of the reactor 131 and rotates the reactor 131. The reactor 131 is rotated by the third driving unit 135, and in order to improve the reactivity of the mixed solution and the pulverization of lithium sulfide according to the rotation of the reactor 131, at least the inner wall of the reactor 131 protrudes toward the center. One partition wall 133 is provided.

Meanwhile, when lithium sulfide is synthesized inside the reactor 131, lithium sulfide and a solvent or lithium sulfide and a solvent and a catalyst may be supplied to the separation unit 140 through the outlet of the reactor 131. At this time, a screen is provided on the outlet side of the reactor 131 to prevent the beads 137 provided inside the reactor 131 from being discharged toward the separation unit 140.

The separation unit 140 is provided between the reactor 131 of the reaction unit 130 and the second drying unit 150, which will be described later. The separation unit 140 separates the solvent from the lithium sulfide supplied from the reaction unit 130 to the second drying unit 150, or the lithium sulfide supplied from the reaction unit 130 to the second drying unit 150. Separate the solvent and catalyst from the solvent and catalyst. The solvent or solvent and catalyst separated in the separation unit 140 are recovered in the solvent supply unit 195.

And in this embodiment, the solvent supplied to the reactor 131 from the solvent supply unit 195 is dimethyl ether (DME), tetrahydrofuran (THF), ethylene glycol, and dimethyl. Dimethyl Sulfoxide (DMSO), Benzene, Toluene, Acetonitrile, Propylene carbonate (PC), Dichloromethane (DCM), Xylene, Tetrahydro Tetrahydropyran, aliphatic hydrocarbon, caprolactam, N-methylcaprolactam, N-methyl-2-pyrrolidone, NMP ) and may be one or more selected from the group consisting of tetramethylurea.

Meanwhile, the solvent supplied to the reactor 131 from the solvent supply unit 195 can be an eco-friendly solvent, and the eco-friendly solvents include gamma-valerolactone (GVL) and deep eutectic solvent (DES). And it may be one or more types selected from the group consisting of ionic liquids. Here, the gamma-valerolactone can be extracted from at least one selected from aliphatic compounds, urea compounds, lactam compounds, and biomass, and the eutectic solvent is a mixture of choline chloride and urea, choline It may be at least one selected from the group consisting of a mixture of chloride and glycerol and a mixture of choline chloride and acetic acid, and the ionic liquid is 1-ethyl-3-methylimidazolium (1-ethyl- 3-methylimidazolium), 1-butyl-3-methylimidazolium, 1-octyl-3-methylimidazolium, 1-decyl-3 -methylimidazolium (1-decyl-3-methylimidazolium), 1-dodecyl-3-methylimidazolium, tetrafluoroborate (BF ₄ ), hexafluoro Phosphate (hexafluorophosphate, PF ₆ ), bis-trifluoromethanesulfonimide (NTf ₂ ), trifluoromethanesulfonate (OTf), dicyanamide (N(CN) ₂ ) , hydrogen sulphate (HSO ₄ ), ethyl sulphate (EtOSO ₃ ), tributyl(tetradecyl)phosphonium and trihexyl(tetradecyl). It may be one or more types selected from the group consisting of phosphonium). Lithium sulfide can be produced in an environmentally friendly manner by using the above-mentioned eco-friendly solvent when synthesizing lithium sulfide.

The reaction conditions for synthesizing lithium sulfide inside the reactor 131 are as follows.

[Chemical equation]

2LiOH + H ₂ S -> Li ₂ S + 2H ₂ O

[Theoretical calculation]

1.1 kg LiOH = 45.93 mol

H ₂ S 22.96 mol = 783.09 g = 508.83L

Xylene 989.62 kg

[Theoretical weight ratio]

LiOH : H ₂ S : Xylene = 1: 0.71: 899.66

[Actual Weight Ratio]

LiOH : H ₂ S : Xylene = 1: 7.69 :899.66

[Weight ratio range]

LiOH: H ₂ S: Xylene = 1: 0.71 ~ 7.69: 10 ~ 1000

[Pressure range]

0 bar ~ 15 bar

[Temperature range]

200~250℃

As described above, in order to heat the reactor 131, the present embodiment further includes a second jacket unit 175 disposed to surround the reactor 131.

The second jacket unit 175 is provided in a second housing (not shown) that surrounds the reactor 131 and forms a heating space between the outer walls of the reactor 131, and in the lower part of the second housing, and includes a first jacket unit ( A second inlet (not shown) through which the reheated steam supplied from 170) flows in, and a second outlet (not shown) provided on the upper part of the second housing and disposed opposite to the second inlet and through which the reheated steam that has passed through the heating space is discharged. includes poetry).

As described above, reheat steam discharged from the first outlet of the first jacket unit 170 is supplied to the second housing surrounding the reactor 131. The reheat steam discharged from the first outlet and supplied to the heating space of the second housing may have a temperature of 300 to 350°C. Reheat steam is supplied to the second housing to heat the reactor 131, thereby indirectly heating the mixed liquid and lithium sulfide. And the reheat steam discharged from the second outlet of the second jacket unit 175 is recovered to the reheat steam supply unit 160. The reheat steam discharged from the second outlet and supplied to the reheat steam supply unit 160 may have a temperature of 150 to 200°C.

Lithium sulfide, solvent, catalyst, etc. synthesized inside the reactor 131 are supplied to the second drying unit 150 through the separation unit 140.

The second drying unit 150 according to this embodiment serves to dry lithium sulfide.

The second drying unit 150 may be configured as a cylindrical rotary kiln that rotates at a predetermined speed.

Referring to FIGS. 8 and 9, the second drying unit 150 is provided with a second main body 151 to which lithium sulfide is supplied and inside the second main body 151 to move the lithium sulfide. It includes at least one second baffle plate 153 that pulls lithium sulfide upward and then drops it downward as the unit 151 rotates, and a second drive unit 155 that rotates the second main body 151. do.

The second main body 151 is rotated clockwise or counterclockwise by the second driving unit 155. Lithium sulfide climbing the inner wall of the second main body 151 falls downward from the inside of the second main body 151 as its angle of repose collapses. The second main body 151 may be installed at an angle, and the inlet of the second main body 151 may be located higher than the outlet.

Lithium sulfide, etc. discharged from the reaction unit 130 and passing through the separation unit 140 is supplied to the inside of the second main body 151, and while the second main body 151 is rotated, lithium sulfide is supplied to the second main body 151. It is rotated inside (151) and dried as it moves toward the outlet.

Additionally, at least one second baffle plate 153 is provided inside the second body portion 151 to facilitate movement of lithium sulfide. The second baffle plate 153 is provided to protrude from the inner wall of the second main body 151 toward the center, and an end portion of the second baffle plate 153 is formed to be inclined. That is, a second inclined portion 154 is formed at the end of the second baffle plate 153. The second baffle plate 153 has the advantage of facilitating the movement of lithium sulfide introduced into the second body portion 151.

The second baffle plate 153 pulls lithium sulfide from the lower part of the second main body 151 to the upper part as the second main body 151 rotates and then causes it to fall downward at a certain position.

Lithium sulfide repeats falling at a certain position due to the rotation of the second main body 151 and the second baffle plate 153. This is called a cascade effect because it looks similar to falling waterfall. do.

When lithium sulfide repeats the upward and falling motion, the surface of lithium sulfide is exposed, and as described above, lithium sulfide is indirectly heated by the second reactor 131 heated by the first jacket unit 170. heated and dried. Meanwhile, the second driving unit 155 includes a roller that is in close contact with the outer wall of the second main body 151 and rotates the second main body 151.

In this embodiment, the moisture content of lithium sulfide dried and discharged from the second body portion 151 is 0.0001 to 1% by weight (wt%).

As described above, lithium sulfide dried and discharged from the second drying unit 150 is stored in the lithium sulfide storage unit 197. In addition to the lithium sulfide that is dried and discharged from the second drying unit 150, the solvent or solvent and catalyst are recovered to the solvent supply unit 195.

As such, the present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and changes can be made without departing from the spirit and scope of the present invention. Accordingly, such modifications or variations should be considered to fall within the scope of the claims of the present invention.

100: Continuous production system of lithium sulfide
110: first drying unit 120: grinding unit
130: reaction unit 140: separation unit
150: second drying unit 160: reheat steam supply unit
170: first jacket unit 175: second jacket unit
180: Cyclone 185: Discharge unit
191: Lithium hydroxide supply unit 193: Hydrogen sulfide supply unit
195: Solvent supply unit 197: Lithium sulfide storage unit

Claims (10)

A reaction unit to which lithium hydroxide, hydrogen sulfide (H ₂ S) and a solvent are supplied and heated to synthesize lithium sulfide (Li ₂ S);
a drying unit where the lithium sulfide synthesized in the reaction unit is supplied and dried; and
A continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery, which is heated by supplying reheat steam to a drying unit and the reaction unit.
According to paragraph 1,
The drying unit is,
a second body to which the lithium sulfide is supplied;
at least one baffle plate provided inside the main body to move the lithium sulfide, and to pull the lithium sulfide upward and then fall downward as the main body rotates; and
It includes a driving unit that rotates the main body,
A continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery, further comprising a jacket unit arranged to surround the main body.
According to paragraph 2,
The reaction unit is,
A reactor in which the lithium hydroxide, the hydrogen sulfide, and the solvent are supplied, mixed with each other to generate a mixed solution, and synthesize the lithium sulfide;
A plurality of beads provided inside the reactor to control the particle size of the lithium sulfide;
At least one partition protrudes from the inner wall of the reactor and improves the reactivity of the mixed solution and the pulverization of lithium sulfide as the reactor rotates;
a screen provided at the outlet of the reactor to prevent the beads from being discharged; and
A continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery, including a third driving unit that rotates the reactor.
According to paragraph 1,
A continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery in which the moisture content of the lithium sulfide discharged from the drying unit is 1% by weight or less.
According to paragraph 3,
It further includes a second jacket unit disposed to surround the reactor,
The reheat steam discharged from the first jacket unit is supplied to the second jacket unit to heat the reactor, thereby indirectly heating the mixed liquid and the lithium sulfide, and the reheat steam discharged from the second jacket unit is the reheat steam. Continuous lithium sulfide synthesis reactor using reheated steam for all-solid-state batteries recovered from the supply unit.
In clause 7,
The reheat steam supplied from the first jacket unit to the second jacket unit is 300 to 350°C,
The reheat steam recovered from the second jacket unit to the reheat steam supply unit is a continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery at 150 to 200°C.
According to paragraph 2,
It further includes a cyclone for recovering the lithium hydroxide contained in the vapor discharged from the first body portion,
The lithium hydroxide recovered from the cyclone is re-supplied to the first main body, and the steam supplied from the cyclone to the reheat steam supply unit is a continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery at 150 to 200 ° C. .
In clause 7,
Reheating for an all-solid-state battery further includes a discharge unit for discharging excess steam by an amount increased by the steam flow rate during the process of drying the lithium hydroxide in the first body portion among the steam discharged from the cyclone and supplying the steam to the reheat steam supply unit. Continuous lithium sulfide synthesis reactor using steam.
According to paragraph 1,
It further includes a lithium sulfide storage unit in which the lithium sulfide dried and discharged from the drying unit is stored,
In addition to the lithium sulfide that is dried and discharged from the drying unit, the solvent is recovered in the solvent supply unit. A continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery.
According to clause 9,
It further includes a separation unit provided between the drying unit and the reaction unit to separate the solvent from the lithium sulfide and the solvent supplied from the reaction unit to the drying unit,
A continuous lithium sulfide synthesis reactor using reheat steam for an all-solid-state battery in which the solvent separated from the separation unit is recovered to the solvent supply unit.