CN210718614U - Sintering device for high-nickel anode material of high-conductivity lithium ion battery - Google Patents

Sintering device for high-nickel anode material of high-conductivity lithium ion battery Download PDF

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CN210718614U
CN210718614U CN201921244856.8U CN201921244856U CN210718614U CN 210718614 U CN210718614 U CN 210718614U CN 201921244856 U CN201921244856 U CN 201921244856U CN 210718614 U CN210718614 U CN 210718614U
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sintering
chamber
lithium ion
ion battery
cathode material
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毛秦钟
夏阳
钱志挺
张文魁
吴海军
黄辉
陈安琪
王坤
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Zhejiang Haichuang lithium battery technology Co.,Ltd.
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Zhejiang Meidu Haichuang Lithium Electricity Technology Co ltd
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    • Y02E60/10—Energy storage using batteries

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Abstract

The utility model discloses a sintering device of high nickel cathode material of high conductivity lithium ion battery, its technical scheme main points are including the fritting furnace with set up the conveyer belt in the fritting furnace, the fritting furnace include the presintering room and with the exit end spatial connection's of presintering room high temperature sintering room, the exit end of high temperature sintering room is connected with carbon dioxide plasma processing chamber, the inlet end of fritting furnace and carbon dioxide plasma processing chamber is provided with vent pipe respectively, and the tail gas discharge port of fritting furnace and carbon dioxide plasma processing chamber all is provided with tail gas processing apparatus. An object of the utility model is to provide a sintering device of high nickel cathode material of high conductivity lithium ion battery not only can reduce the mixed row degree of high nickel cathode material, improves the cyclicity performance and the life cycle of material, can show the conductivity of promotion material moreover, improves the multiplying power performance of material.

Description

Sintering device for high-nickel anode material of high-conductivity lithium ion battery
Technical Field
The utility model relates to a sintering device of high nickel cathode material of high conductivity lithium ion battery, more specifically the theory that says so, it relates to lithium ion battery cathode material sintering device field.
Background
In order to improve the competitiveness of new energy automobiles, the requirements of the market on the capacity, the cycle performance and the rate capability of the lithium ion battery are gradually increased. The high-nickel anode material has higher discharge capacity, can meet the requirement of people on the endurance of new energy vehicles at present, and is considered to be the next generation of lithium ion power battery anode material. However, the conductivity of the high nickel cathode material is poor, which results in poor rate performance of the battery; secondly, because the radiuses of lithium ions and divalent nickel ions are relatively close, the high-nickel cathode material is easy to generate a lithium-nickel mixed discharge phenomenon in the sintering process, so that the capacity of the material is reduced and the cycle performance is reduced.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a sintering device of high nickel cathode material of high conductivity lithium ion battery not only can reduce the mixed row degree of high nickel cathode material, improves the cyclicity performance and the life cycle of material, can show the electric conductive property who improves high nickel material moreover, promotes the multiplying power performance of material.
In order to achieve the above purpose, the utility model provides a following technical scheme: the sintering device comprises a sintering furnace and a conveyor belt arranged in the sintering furnace, wherein the sintering furnace comprises a pre-sintering chamber and a high-temperature sintering chamber connected with the outlet end of the pre-sintering chamber, the outlet end of the high-temperature sintering chamber is connected with a carbon dioxide plasma processing chamber, the air inlet ends of the sintering furnace and the carbon dioxide plasma processing chamber are respectively provided with a ventilation pipeline, and the tail gas outlet ports of the sintering furnace and the carbon dioxide plasma processing chamber are respectively provided with a tail gas processing device.
In order to better distribute the requirement of different gases of each sintering chamber without influencing other sintering chambers, the ventilation pipeline preferably comprises a double-passage gas pipeline arranged at the gas inlet end of the high-temperature sintering chamber and a single-passage gas pipeline respectively arranged at the gas inlet ends of the pre-sintering chamber and the carbon dioxide plasma processing chamber.
In order to better control the volume ratio of gas entering and more effectively convert a part of oxygen into ozone, the double-gas-passing pipeline preferably comprises two pipelines arranged in parallel, each pipeline is provided with a flow meter, and an ozone generator is arranged on any pipeline.
In order to improve the sintering quality, preferably, the pipelines of the single-gas pipeline and the double-gas pipeline are respectively provided with a gas filtering device.
In order to control the gas inlet and outlet more conveniently, preferably, the pipelines of the single-way gas pipeline and the double-way gas pipeline are respectively provided with a vent valve.
For better control of the gas, preferably, the single-gas line and the double-gas line are respectively provided with a pressure gauge and a flowmeter.
In order to improve the stability and consistency of the material, preferably, the pre-sintering chamber and the high-temperature sintering chamber are respectively connected with a temperature sensor.
In order to control a better sintering effect, the temperature of the pre-sintering chamber is preferably 300-700 ℃, the temperature of the high-temperature sintering chamber is preferably 700-860 ℃, and the temperature of the carbon dioxide plasma treatment chamber is preferably 30-700 ℃.
In order to balance the air pressure and achieve the environment-friendly circulation effect, preferably, a tail gas discharge port of the sintering furnace is provided with a tail gas valve, and a pressure gauge and a flowmeter are arranged between the tail gas valve and the tail gas treatment device.
The utility model has the advantages that: sintering under the ozone atmosphere can reduce the sintering time of the material, save energy and improve the productivity of the material; the consumption of sintering gas is reduced, and the sintering cost of the material is reduced; the lithium-nickel mixed-arrangement degree of the high-nickel ternary cathode material can be reduced, and the consistency and the stability of the material are improved. After sintering, plasma carbon dioxide treatment is carried out, so that the content of residual alkali on the surface can be reduced, the conductivity of the material can be improved, and the rate capability of the material can be obviously improved.
Drawings
FIG. 1: is a top view of the preparation device of the utility model;
FIG. 2: is a side view of the preparation device of the utility model;
FIG. 3: is a structural diagram of a double-air pipeline of the preparation device of the utility model;
FIG. 4: is a structural diagram of a single vent pipe of the preparation device of the utility model;
FIG. 5: is a structure diagram of the tail gas absorption device of the utility model;
FIG. 6: the positive electrode material prepared in example 1 of the present invention was prepared at 100 mA g-1A charge-discharge cycle curve at current density;
in the figure: 1. a pre-sintering chamber; 2. a high-temperature sintering chamber; 3. a carbon dioxide plasma processing chamber; 4. a single vent line; 5. a double vent line; 6. a tail gas discharge port; 7. a tail gas treatment device; 8. a temperature sensor; 9. a vent line; 10. a conveyor belt; 11. a vent valve; 12. a gas filtering device; 13. a flow meter; 14. an ozone generator; 15. a booster pump; 16. a pressure gauge; 17. tail gas valve.
Detailed Description
The technical solution of the present invention is further illustrated by the following embodiments and accompanying drawings.
As shown in fig. 1 to 5, the sintering device for the high-nickel cathode material of the high-conductivity lithium ion battery comprises a sintering furnace and a conveyor belt 10 arranged in the sintering furnace, wherein the sintering furnace comprises a pre-sintering chamber 1 and a high-temperature sintering chamber connected with the outlet end of the pre-sintering chamber 1, the outlet end of the high-temperature sintering chamber is connected with a carbon dioxide plasma processing chamber 3, the air inlet ends of the sintering furnace and the carbon dioxide plasma processing chamber 3 are respectively provided with a vent pipeline 9, and the tail gas outlet 6 of the sintering furnace and the carbon dioxide plasma processing chamber 3 are respectively provided with a tail gas processing device 7.
The ventilation pipeline comprises a double-passage gas pipeline 5 arranged at the gas inlet end of the high-temperature sintering chamber 2 and a single-passage gas pipeline 4 respectively arranged at the gas inlet ends of the pre-sintering chamber 1 and the carbon dioxide plasma processing chamber 3.
The ventilation pipeline is divided into a single ventilation pipeline 4 and a double ventilation pipeline 5, the single ventilation pipeline 4 is used for introducing single gas, and the double ventilation pipeline 5 can introduce two different gases or mixed gas of the two different gases.
The double-ventilation pipeline 5 comprises two pipelines arranged in parallel, each pipeline is provided with a flowmeter 13, and any pipeline is provided with an ozone generator 14.
For the double gas pipelines 5, each pipeline is provided with a flowmeter 13 for detecting the flow rate of each pipeline and the volume ratio of gas introduced into each pipeline, and the volume ratio of different gases introduced into each pipeline can be controlled by adjusting the flowmeters 13; also, one of the lines is fitted with an ozone generator 14 for converting a portion of the oxygen to ozone.
And the pipelines of the single ventilation pipeline 4 and the double ventilation pipeline 5 are respectively provided with a gas filtering device 12 for absorbing solid particles, water vapor and the like in gas.
And the pipelines of the single ventilation pipeline 4 and the double ventilation pipeline 5 are respectively provided with a ventilation valve 11.
The single vent pipeline 4 and the double vent pipeline 5 are respectively provided with a pressure gauge 16, a flowmeter 13 and a booster pump 15 controlled to be closed by the pressure gauge 16 and the flowmeter 13.
Each vent pipe is provided with a pressure gauge 16, a flowmeter 13 and a booster pump 15 for detecting the pressure and flow rate of the introduced gas, and the pressure and flow rate of the introduced gas can be controlled by adjusting the booster pump 15, and when the pressure and flow rate of the introduced gas are lower than a certain value, the booster pump 15 is automatically started.
The pre-sintering chamber 1 and the high-temperature sintering chamber 2 are respectively connected with a temperature sensor 8.
The temperature of the pre-sintering chamber 1 is 300-700 ℃, the temperature of the high-temperature sintering chamber 2 is 700-860 ℃, and the temperature of the carbon dioxide plasma treatment chamber 3 is 30-700 ℃.
The high-temperature sintering furnace comprises a pre-sintering chamber 1, a high-temperature sintering chamber 2 and a carbon dioxide plasma treatment chamber 3, wherein the temperatures are controlled to be 300-700 ℃, 700-860 ℃ and 30-700 ℃ respectively. Thermocouples are arranged in the pre-sintering chamber 1 and the high-temperature sintering chamber 2 to monitor the temperature in the sintering furnace, so that the furnace is kept at a certain temperature, and the stability and consistency of materials are improved.
The high-temperature sintering furnace has good temperature control and heat preservation performance and excellent corrosion resistance, and ensures that the material is sintered at an accurate temperature.
And a tail gas valve 17 is arranged at a tail gas outlet 6 of the sintering furnace, and a pressure gauge 16 and a flow meter 13 are arranged between the tail gas valve 17 and the tail gas treatment device 7 and are used for balancing the gas pressure and absorbing incompletely reacted gases such as ozone, carbon dioxide and the like.
The molecular formula of the high nickel anode material which can be used for preparing the device is LiNi x y(1--)Co x M y O2X + y is less than or equal to 0.7, and M is one of Mn and Al.
By adopting the technical scheme, the method has the advantages that,
example 1
Nickel-rich nickel positive electrodePrecursor Ni of electrode material0.8Co0.1Mn0.1(OH)2And lithium salt lioh2O is mixed according to a molar ratio of 1: 1.05, placing the mixture into a high-temperature sintering furnace, sealing, checking the air tightness of the device, ensuring that valves of all pipelines are in a closed state, arranging an air vent at the lower end of a sintering chamber, and arranging an air outlet at the upper end of the sintering chamber. And opening a ventilation valve 11 of the pre-sintering chamber 1, introducing air, and preserving heat for 2 hours at 500 ℃ to perform pre-sintering. After the pre-sintering is finished, the vent valve 11 of the pre-sintering chamber 1 is closed, the material is pushed into the sintering chamber, meanwhile, the oxygen valve of the sintering chamber is opened, oxygen is introduced, and the material is sintered for 12 hours at 760 ℃. Wherein, after the sintering chamber reaches the maximum sintering temperature, the ozone generator 14 is opened, and oxygen containing ozone is introduced for sintering for 1 hour. And when the sintering enters a cooling stage, closing the ozone valve, after the material is cooled to room temperature, pushing the material into a carbon dioxide plasma generator, controlling the reaction time to be 1 h, and collecting the high-nickel anode material. (gas flow rates were all set to 2L h-1) Preparing the obtained high-nickel positive electrode material, Super P and PVDF into slurry according to the ratio of 90:5:5, coating the slurry on an aluminum foil, drying and rolling to obtain a positive electrode piece, and assembling the CR2025 type half-cell by taking a lithium piece as a counter electrode. The battery is at 100 mA g-1The charge-discharge cycle curve at current density is shown in fig. 6.
Examples 2 to 9
On the basis of example 1, the positions of the air vent and the air outlet were changed. The cycling performance of the button cell assembled by the high nickel anode material obtained under different conditions is shown in table 1 (the charge-discharge current density is 100 mA g)-1)。
Figure DEST_PATH_IMAGE002A
It can be seen from examples 2 to 9 that under the condition that other conditions are not changed, the positions of the air vent and the air outlet are changed, and when the positions of the air vent and the air outlet are both at the upper part of the sintering furnace, the capacity retention rate is the highest, so that the better cycle performance of the corresponding material is achieved.
Examples 10 to 13
On the basis of example 1, the carbon dioxide plasma treatment time was changed to 10 min, 20 min, 30min and 50 min, respectively. The cycling performance of the button cell assembled by the high nickel anode material obtained under different conditions is shown in table 2 (the charge-discharge current density is 100 mA g)-1)。
TABLE 2 Cyclic Properties of materials for different carbon dioxide plasma treatment times
Figure DEST_PATH_IMAGE004
It can be seen from examples 10 to 13 that under the condition that other conditions are not changed, the carbon dioxide plasma processing time is changed, and when the carbon dioxide plasma processing time is 30min, the capacity retention rate is the highest, so that the better cycle performance of the corresponding material is achieved.
It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (9)

1. The utility model provides a sintering device of high nickel cathode material of high conductivity lithium ion battery, includes the fritting furnace and sets up conveyer belt (10) in the fritting furnace, its characterized in that: the sintering furnace comprises a pre-sintering chamber (1) and a high-temperature sintering chamber (2) connected with the outlet end of the pre-sintering chamber (1), and the outlet end of the high-temperature sintering chamber (2) is connected with a carbon dioxide plasma processing chamber (3); and the air inlet ends of the sintering furnace and the carbon dioxide plasma processing chamber (3) are respectively provided with a ventilation pipeline (9), and the tail gas outlet ports (6) of the sintering furnace and the carbon dioxide plasma processing chamber (3) are respectively provided with a tail gas processing device (7).
2. The sintering device for the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 1, characterized in that: the ventilation pipeline (9) comprises a double-channel ventilation pipeline (5) arranged at the air inlet end of the high-temperature sintering chamber (2) and a single-channel ventilation pipeline (4) respectively arranged at the air inlet ends of the pre-sintering chamber (1) and the carbon dioxide plasma processing chamber (3).
3. The sintering device for the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 2, characterized in that: the double-ventilation pipeline (5) comprises two pipelines which are arranged in parallel, each pipeline is provided with a flowmeter (13), and any pipeline is provided with an ozone generator (14).
4. The sintering device of the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 3, characterized in that: and the pipelines of the single ventilation pipeline (4) and the double ventilation pipeline (5) are respectively provided with a gas filtering device (12).
5. The sintering device of the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 3, characterized in that: and the pipelines of the single ventilation pipeline (4) and the double ventilation pipeline (5) are respectively provided with a ventilation valve (11).
6. The sintering device for the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 2, characterized in that: and the single ventilation pipeline (4) and the double ventilation pipeline (5) are respectively provided with a pressure gauge (16) and a flowmeter (13).
7. The sintering device for the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 2, characterized in that: the pre-sintering chamber (1) and the high-temperature sintering chamber (2) are respectively connected with a temperature sensor (8).
8. The sintering device for the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 1, characterized in that: the temperature of the pre-sintering chamber (1) is 300-700 ℃, the temperature of the high-temperature sintering chamber (2) is 700-860 ℃, and the temperature of the carbon dioxide plasma treatment chamber (3) is 30-700 ℃.
9. The sintering device for the high-nickel cathode material of the high-conductivity lithium ion battery according to claim 1, characterized in that: and a tail gas valve (17) is arranged at a tail gas outlet (6) of the sintering furnace, and a pressure gauge (16) and a flow meter (13) are arranged between the tail gas valve (17) and the tail gas treatment device (7).
CN201921244856.8U 2019-08-02 2019-08-02 Sintering device for high-nickel anode material of high-conductivity lithium ion battery Active CN210718614U (en)

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Address after: 312300 No. 5 Weiqi East Road, Hangzhou Bay Economic and Technological Development Zone, Shangyu District, Shaoxing City, Zhejiang Province

Patentee after: Zhejiang Haichuang lithium battery technology Co.,Ltd.

Address before: 312369 No. 5, Weiqi East Road, Hangzhou Bay Economic and Technological Development Zone, Shangyu District, Shaoxing City, Zhejiang Province

Patentee before: ZHEJIANG MEIDU HAICHUANG LITHIUM ELECTRICITY TECHNOLOGY Co.,Ltd.