A small lithium battery positive electrode material baking device and method

Abstract

The present invention relates to the field of chemical material technology, and in particular to a small-sized lithium battery positive electrode material roasting device and method. The small-sized lithium battery positive electrode material roasting device comprises a roasting box, a calcining section and a fuel inner sleeve are arranged in the roasting box, the calcining section heats the fuel inner sleeve through a program controller, a driving device is arranged at one end of the fuel inner sleeve, the driving device drives the fuel inner sleeve to rotate circumferentially, and the calcining section is coated with a heat-insulating material layer on the outside of the fuel inner sleeve; a vent pipe is inserted at the other end of the fuel inner sleeve, and the vent pipe extends into the space inside the fuel inner sleeve to form a cooling section; an anti-scalding sleeve is wrapped outside the cooling section; two driving cylinders are arranged in the program controller, and the piston rods of each driving cylinder extend out of the top of the program controller and are hinged to the bottom of the roasting box. The fuel inner sleeve of the roasting device rotates circumferentially during roasting, which improves the reaction efficiency, and tilts into the cooling section after the roasting is completed, which better realizes the rapid cooling of the material in the fuel inner sleeve and improves the roasting preparation efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical materials, and in particular to a device and method for baking positive electrode materials of a small lithium battery. Background Art

[0002] The development of new energy vehicles has brought about the rapid development of power lithium-ion batteries. The roasting furnace that completes the roasting process of battery positive electrode materials is a key equipment in the production process of positive electrode materials. The existing laboratory roasting furnace for lithium battery positive electrode materials has a simple structure and has the following problems: First, the calcination section of the roasting furnace can ensure the heating of the materials inside, but the heating uniformity and roasting efficiency are limited, and the calcination is not sufficient; second, the cooling process after calcination cannot be achieved quickly, which prolongs the generation cycle of the product. In view of the problems existing in the roasting process of existing battery positive electrode materials, it is urgent to develop a roasting device with an improved structure in order to better simplify the operation and improve the roasting efficiency. Summary of the invention

[0003] The present invention provides a small-sized lithium battery positive electrode material roasting device and method. By improving the equipment structure of the roasting process, the fuel inner sleeve is made to rotate circumferentially during the roasting process. At the same time, the entire roasting box body used to support the fuel inner sleeve can swing left and right at a certain frequency during the roasting process, so that the fuel inner sleeve is heated evenly, the reaction efficiency is improved, and the full reaction of the material in the fuel inner sleeve is better achieved, thereby solving the problems existing in the prior art.

[0004] One of the technical solutions adopted by the present invention is:

[0005] A small-sized lithium battery positive electrode material roasting device comprises a roasting box, a calcining section and a fuel inner sleeve sleeved in the calcining section are arranged in the roasting box, the calcining section is controlled by a program controller to heat the fuel inner sleeve, a driving device is arranged at one end of the fuel inner sleeve, the driving device drives the fuel inner sleeve to rotate circumferentially in the calcining section, and the calcining section outside the fuel inner sleeve is coated with a thermal insulation material layer; a vent pipe is inserted into the other end of the fuel inner sleeve, and the vent pipe extends into the space in the fuel inner sleeve to form a cooling section; an anti-scalding sleeve is wrapped on the outside of the fuel inner sleeve corresponding to the cooling section; two driving cylinders arranged at an angle for supporting the roasting box are arranged in the program controller, and the piston rod of each driving cylinder extends out of the top of the program controller and is hinged to the bottom of the roasting box.

[0006] Furthermore, a heat-resistant burning tube is fixedly connected to one end of the fuel inner sleeve, and the driving device drives the heat-resistant burning tube to rotate and thus drives the fuel inner sleeve to rotate.

[0007] Furthermore, the heat-resistant tube is a cast iron or quartz heat-resistant tube.

[0008] Furthermore, the driving device comprises a driving motor, and the driving motor drives the fuel inner sleeve to rotate via gears.

[0009] Furthermore, a first gear is fixedly connected to the outside of the heat-resistant burning tube, a driving motor is fixed to one side of the roasting box, a second gear is fixedly sleeved on the output shaft of the driving motor, and the first and second gears are meshed. Thus, under the drive of the driving motor, the first gear and the second gear are meshed to drive the heat-resistant burning tube to rotate, thereby driving the fuel inner sleeve to move circumferentially in the combustion section.

[0010] Furthermore, the heat-insulating material layer includes a refractory brick layer and an asbestos layer which are sequentially arranged from the inside to the outside in the calcining section of the calcining box. The heat-insulating material can reduce the loss of temperature and has the functions of anti-scalding and supporting.

[0011] Furthermore, two support bearings are arranged at both ends of the combustion section of the roasting box, and the fuel inner sleeve is supported by the support bearings.

[0012] Furthermore, the cylinder body is a hydraulic cylinder or a pneumatic cylinder.

[0013] Furthermore, the cylinder is an electric hydraulic rod. The cooperation of the two electric hydraulic rods has the function of left and right alternation, which can make the material rotate. The left and right tilting can be used to slide to the cooling section for rapid cooling, and the left and right frequency dynamics make the burning more uniform.

[0014] Furthermore, plugs are sealed at both ends of the fuel inner sleeve respectively, a vent pipe is extended into the fuel inner sleeve through an opening on the plug, and an air outlet is arranged on the plug on the other side of the fuel inner sleeve.

[0015] Furthermore, a plug body is arranged at the outer end of the heat-resistant tube, and an air outlet hole is arranged on the plug body.

[0016] Furthermore, a plurality of air holes are arranged on the ventilation pipe.

[0017] Furthermore, the air hole is arranged on the side wall of the ventilation pipe extending into the interior of the fuel inner sleeve.

[0018] Furthermore, the air inlet end of the vent pipe is connected to an external gas cylinder for containing combustion-supporting gas and a cooling fan. During the roasting reaction, the combustion-supporting gas in the gas cylinder is introduced into the fuel inner sleeve through the vent pipe. At the end of the reaction, after the internal material enters the cooling section, the cooling fan continuously delivers cold air into the space of the cooling section through the vent pipe. After the cold air cools the material in the cooling section, it enters the fuel inner sleeve and the heat-resistant burning tube and is discharged from the air outlet at the outer end of the heat-resistant burning tube.

[0019] The second technical solution adopted by the present invention is:

[0020] A method for roasting anode materials of a small lithium battery comprises the steps of roasting using the roasting device as described above.

[0021] The method for calcining the positive electrode material of a small lithium battery comprises the following steps:

[0022] (1) Place the required calcined material into the fuel inner sleeve, and insert plugs into the ports at both ends, and introduce a certain flow of combustion-aiding gas to fill the fuel inner sleeve with the gas in advance;

[0023] (2) Set the required calcination program in the program-controlled instrument, start heating, and turn on the drive device and the cylinder body, so that the two cylinder bodies are alternately driven to achieve the alternating movement of the roasting box tilting and swinging left and right;

[0024] (3) After sintering is completed, the two cylinders work together to automatically tilt the inner sleeve of the sintered material, and the internal material enters the cooling section. The gas is closed, and cold gas is introduced through the vent pipe to achieve rapid cooling.

[0025] (4) The sintered material is taken out, crushed, and sieved to obtain a spherical positive electrode material.

[0026] Furthermore, the calcination device and method are applicable to both ternary materials and lithium iron phosphate materials.

[0027] Beneficial effects of the present invention:

[0028] The roasting device of the present invention improves the equipment structure of the roasting process so that the fuel inner sleeve rotates circumferentially during the roasting process. At the same time, the entire roasting box used to support the fuel inner sleeve can swing left and right at a certain frequency during the calcination process, so that the fuel inner sleeve is heated evenly, the reaction efficiency is improved, and the full reaction of the substance in the fuel inner sleeve is better achieved. By setting a cooling section at one end of the fuel inner sleeve, after the reaction is completed, the reaction product is quickly moved to the cooling section through the tilting movement of the roasting box, and is cooled by the cooling gas and quickly condensed into a solid, which is convenient for the preparation of the positive electrode material of the ternary lithium battery and improves its comprehensive electrochemical performance and processing application performance. The roasting device has a scientific and reasonable structural design, high roasting efficiency, simple operation, and is economical and practical. The roasting device is combined with the subsequent preparation of the positive electrode material of the battery to improve the overall preparation efficiency of the preparation process, which is simple and easy to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the experimental device of the present invention;

[0030] Among them, 1 is a roasting box, 2 is a fuel inner sleeve, 3 is a program controller, 4 is a driving device, 4.1 is a driving motor, 4.2 is a first gear, 4.3 is a second gear, 5 is a ventilation pipe, 6 is a cooling section, 7 is an anti-scalding sleeve, 8 is a driving cylinder, 9 is a heat-resistant burning tube, 10 is a refractory brick layer, 11 is an asbestos layer, 12 is a supporting bearing, 13 is an air outlet, 14 is an air hole, and 15 is a plug. DETAILED DESCRIPTION

[0031] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods in conjunction with the accompanying drawings.

[0032] Example 1

[0033] The small lithium battery positive electrode material roasting device comprises a roasting box 1, a calcining section and a fuel inner sleeve 2 sleeved in the calcining section are arranged in the roasting box, the calcining section is controlled by a program controller 3 to heat the fuel inner sleeve 2, a driving device 4 is arranged at one end of the fuel inner sleeve, the driving device drives the fuel inner sleeve to rotate in the circumferential direction of the calcining section, and the calcining section outside the fuel inner sleeve is coated with a heat-insulating material layer; a vent pipe 5 is inserted at the other end of the fuel inner sleeve, and the vent pipe extends into the space in the fuel inner sleeve to form a cooling section 6; an anti-scalding sleeve 7 is wrapped on the outer side of the fuel inner sleeve 2 corresponding to the cooling section; two driving cylinders 8 arranged at an angle for supporting the roasting box are arranged in the program controller, and the piston rod of each driving cylinder extends out of the top of the program controller and is hinged with the bottom of the roasting box 1; the cylinder is a hydraulic cylinder or a pneumatic cylinder. The driving of each cylinder can be controlled separately by a controller arranged on the program controller.

[0034] A heat-resistant burning tube 9 is fixedly connected to one end of the fuel inner sleeve, and the driving device 4 drives the heat-resistant burning tube to rotate and then drives the fuel inner sleeve to rotate in the roasting box. The driving device includes a motor box, and a driving motor 4.1 is arranged in the motor box. The driving motor drives the fuel inner sleeve to rotate through gears; that is, a first gear 4.2 is fixedly connected to the outside of the heat-resistant burning tube 9, and the driving motor is fixed to one side of the roasting box. A second gear 4.3 is fixedly sleeved on the output shaft of the driving motor, and the first and second gears are meshed. In this way, under the drive of the driving motor, the first gear and the second gear are meshed to drive the heat-resistant burning tube to rotate, and then drive the fuel inner sleeve to move circumferentially in the combustion section. Of course, the driving device can also adopt other transmission structures for the driving method of the fuel inner sleeve.

[0035] The heat-insulating material layer comprises a refractory brick layer 10 and an asbestos layer 11 which are arranged in sequence from the inside to the outside of the calcining section of the calcining box.

[0036] Two support bearings 12 are arranged at both ends of the combustion section of the roasting box, and the fuel inner sleeve is supported by the support bearings.

[0037] A plug 15 for plugging is respectively arranged at the outer end of the fuel inner sleeve and the outer end of the heat-resistant burning tube. The vent pipe 5 extends into the fuel inner sleeve through the opening arranged on the plug 15. An air outlet 13 is arranged on the plug of the heat-resistant burning tube.

[0038] A plurality of air holes 14 are provided on the ventilation pipe 9. The air holes are provided on the side wall of the ventilation pipe extending into the fuel inner sleeve. By providing a plurality of air holes on the ventilation pipe at the cooling section, the cold air can be better dispersed in the cooling space of the cold section after entering the ventilation pipe, thereby ensuring that the product in the cooling section can achieve a rapid cooling treatment effect.

[0039] The air inlet end of the vent pipe 5 is connected to a gas cylinder and a cold air blower, so as to respectively supply combustion-aiding gas for baking reaction and cold air delivered by the cold air blower during cooling in different baking operation stages.

[0040] Example 2

[0041] The small lithium battery positive electrode material roasting method adopts the following operating steps:

[0042] (1) Nickel cobalt manganese hydroxide, a precursor of a ternary lithium battery, is prepared from nickel cobalt manganese sulfate in a certain ratio, and then an appropriate amount of the precursor and finely ground LiOH powder (molar ratio of 1:2) are weighed, wherein the lithium source is in excess of 5% to compensate for the lithium lost during the sintering process;

[0043] (2) Pre-mix the accurately weighed precursor and LiOH powder, which can be mixed by manual mortar or high-speed ball mill, and put them into the fuel inner sleeve 2 after mixing evenly. Use the plug 15 to seal the port of the fuel inner sleeve and the port of the heat-resistant burning tube 9. A certain flow of combustion-aiding gas (pure oxygen or air) is introduced through the ventilation pipe connected to the plug at the end of the fuel inner sleeve, and the fuel inner sleeve is filled with the gas in advance;

[0044] (3) Set the required calcination program in the program control instrument 3 and start heating. The heat treatment parameters are 2-5℃·min -1 The heating rate was 2-5℃·min. The temperature was raised to 500℃, then kept at this temperature for 4h. -1 The heating rate was increased to 850°C and kept at this temperature for 20 hours;

[0045] During this period, the driving device 4 and the cylinder body are turned on, and the two cylinder bodies arranged at an angle are alternately driven to realize the alternating movement of the roasting box 1 tilting and swinging left and right, and at the same time, the inner sleeve of the fuel moves circumferentially, so as to ensure the uniformity and completeness of the reaction during the sintering process;

[0046] (4) After the baking and sintering is completed, with the cooperation of the two cylinders, the piston rod of the left cylinder is in an extended state, and the piston rod of the right cylinder is retracted, so that the inner sleeve 2 of the burning material is automatically tilted and rotated toward the cooling section 6, and the internal material slides into the cooling section, the combustion-aiding gas is closed, and cold air is introduced through the cold air blower connected to the ventilation pipe to achieve rapid cooling; after the internal material enters the cooling section, the cold air blower connected to the ventilation pipe continuously transports cold air into the space of the cooling section through the ventilation pipe. After the cold air cools the material in the cooling section, it enters the fuel inner sleeve and the heat-resistant burning tube and is discharged from the air outlet at the outer end of the heat-resistant burning tube;

[0047] (5) After cooling, the sintered material is taken out and crushed into a block in a mortar, and then sieved through a 300-mesh sieve to obtain a spherical positive electrode material.

[0048] The above specific implementation manner cannot be used as a limitation on the protection scope of the present invention. For those skilled in the art, any substitution, improvement or change made to the implementation manner of the present invention falls within the protection scope of the present invention.

[0049] The matters not described in detail in the present invention are all known technologies to those skilled in the art.

Claims

1. A small lithium battery positive electrode material baking device, characterized in that: It comprises a roasting box, in which a calcining section and a fuel inner sleeve sleeved in the calcining section are arranged, the calcining section is controlled by a program controller to heat the fuel inner sleeve, a driving device is arranged at one end of the fuel inner sleeve, the driving device drives the fuel inner sleeve to rotate in the circumferential direction of the calcining section, and the calcining section outside the fuel inner sleeve is covered with a heat-insulating material layer; a vent pipe is inserted at the other end of the fuel inner sleeve, the vent pipe extends into the space inside the fuel inner sleeve to form a cooling section, and a plurality of air holes are arranged on the vent pipe; an anti-scalding sleeve is wrapped around the outer side of the fuel inner sleeve corresponding to the cooling section; two driving cylinders arranged at an angle for supporting the roasting box are arranged in the program controller, and the piston rod of each driving cylinder extends out of the top of the program controller and is hinged to the bottom of the roasting box; A heat-resistant burning tube is fixedly connected to one end of the fuel inner sleeve, and the driving device drives the heat-resistant burning tube to rotate and thus drives the fuel inner sleeve to rotate; A plug body is arranged at the outer end of the heat-resistant burning tube, and an air outlet hole is arranged on the plug body; The plug bodies are sealed at both ends of the fuel inner sleeve, the vent pipe is extended into the fuel inner sleeve through the opening provided on the plug body, and an air outlet hole is provided on the plug body on the other side of the fuel inner sleeve; The method for roasting a small lithium battery positive electrode material using the roasting device comprises the following steps: (1) Place the required calcined material into the fuel inner sleeve, and insert plugs into the ports at both ends, and introduce a certain flow of combustion-aiding gas to fill the fuel inner sleeve with the gas in advance; (2) Set the required calcination program in the program controller and start heating. The heat treatment parameters are 2-5℃⋅min -1 The heating rate was 2-5℃⋅min. The temperature was raised to 500℃, then kept at this temperature for 4h. -1 The heating rate is increased to 850℃, kept at this temperature for 20h, and the driving device and the cylinder are turned on, and the alternating movement of the left and right tilting and swinging of the baking box is realized by the alternating driving of the two cylinders; (3) After sintering is completed, the inner sleeve of the fuel is automatically tilted and rotated with the cooperation of the two cylinders, and the internal material enters the cooling section. The gas is closed and cold gas is introduced through the vent pipe to achieve rapid cooling; (4) The sintered material is taken out, crushed, and sieved to obtain a spherical positive electrode material.

2. The small-sized lithium battery positive electrode material baking device according to claim 1, characterized in that: The driving device comprises a driving motor, and the driving motor drives the fuel inner sleeve to rotate via a gear.

3. The small-sized lithium battery positive electrode material baking device according to claim 1, characterized in that: The heat-insulating material layer comprises a refractory brick layer and an asbestos layer which are arranged in sequence from the inside to the outside in the calcining section of the calcining box.

4. The small-sized lithium battery positive electrode material baking device according to claim 1, characterized in that: Two support bearings are arranged at both ends of the combustion section of the roasting box body, and the fuel inner sleeve is supported by the support bearings.

Images