A new method for making a cylinder-cone filter washing and drying device for producing lithium difluorophosphate


As a new type of mobile portable power supply, lithium-ion batteries have higher specific capacity and discharge voltage than traditional lead-acid batteries and alkaline batteries, and have less environmental pollution. At present, lithium-ion batteries are mainly used as portable mobile power sources, mobile phone batteries, and are widely used in electric vehicles, automobiles, etc. as power batteries. Due to the strong support of national policies and the accumulation of lithium-ion battery technology in recent years, the lithium-ion battery industry has achieved tremendous development, and will continue to develop due to policy encouragement and technological progress.

However, there are still many defects in lithium-ion batteries at present. In the development of lithium salts, traditional lithium hexafluorophosphate cannot meet the use of lithium-ion batteries under extreme conditions. The lithium difluorophosphate proposed in the present invention can improve the high and low temperature performance of lithium ion batteries, significantly improve the cycle stability at minus 20°C, and can form a more stable SEI film under high temperature conditions, which can effectively prevent the electrolyte Corrodes electrodes and current collectors, thereby improving the high and low temperature performance of lithium-ion batteries. In addition, lithium difluorophosphate has better stability than lithium hexafluorophosphate, and its resistance to water and oxygen is significantly stronger than lithium hexafluorophosphate.

Therefore, lithium difluorophosphate has great industrial value as a new type of lithium salt additive.

Lithium-ion batteries have high energy density and have been widely used in small electronic products. Therefore, lithium-ion batteries are required to have high capacity, long life, high rate performance and safety. The composition of commonly used electrolytes in commercial lithium-ion batteries is: solvents are cyclic carbonates such as ethylene carbonate and propylene carbonate, and chain carbonates such as diethyl carbonate and dimethyl carbonate. Electrolytes with different compositions It will greatly cause the difference in battery performance.

At present, there are many production methods of lithium difluorophosphate. For example, lithium difluorophosphate is prepared by reacting lithium hexafluorophosphate with water. This method is not easy to control the reaction process, and there are many by-products, which is very unfavorable to production. In addition, lithium hexafluorophosphate and lithium carbonate are used in the market to prepare lithium difluorophosphate in an aprotic solvent, but only a non-aqueous solution of lithium difluorophosphate can be obtained by this method, and high-purity lithium difluorophosphate cannot be obtained, which is very unfavorable. The promotion of lithium difluorophosphate, moreover, there will be more or less some organic impurities and lithium fluoride in the salt solution, and these impurities may have an adverse effect on the performance of the battery.

To sum up, the existing preparation method of lithium difluorophosphate has complicated process and many by-products, which is very unfavorable for the industrialization and promotion of lithium difluorophosphate. Moreover, the separate operation of filtration, washing and drying in the existing lithium difluorophosphate processing process is very troublesome, and the processing of lithium difluorophosphate is relatively rough. In view of the above problems, it is urgent to carry out an innovative design on the original lithium difluorophosphate filter washing and drying device.

Wuxi ZhangHua Machinery Co., Ltd. took a fancy to this potential market. After several years of research and exploration by its own engineer team, it finally successfully developed a cylindrical cone filter washing and drying device for lithium difluorophosphate with independent intellectual property rights to solve the above problems. Problems of rough processing and cumbersome handling are raised in the background art.

Cylindrical cone filter washing and drying device for lithium difluorophosphate Equipment structure and principle:

Cylindrical cone filter washing and drying device for lithium difluorophosphate, including shell, first motor, washing bin, third filter screen and discharge port, the bottom side of the shell is provided with a support seat, and the first motor is located on the support The outer side of the top of the seat, and a filter bin is arranged in the middle of the support seat, a feed inlet is reserved above the filter bin, and the interior of the filter bin is connected with the second motor through a support frame, and the lower side of the second motor is installed with a Rotating shaft, the bottom end of the rotating shaft is equipped with a second filter screen, and the first filter screen is arranged above the second filter screen, the washing compartment is located below the filter compartment, and a passageway is reserved above the right side of the washing compartment The water outlet, the third filter is located in the middle of the washing compartment, and the third filter is connected to the third motor, the third motor is located at the upper end of the right side support base, and above and below the washing compartment are installed Electric telescopic plate, and a drying bin is arranged below the washing bin, an air pump is fixed above the right side of the drying bin, and heating wires are arranged on both sides of the drying bin, and the discharge port is located at the bottom of the drying bin.

Preferably, the filter bin, washing bin and drying bin form a rotating structure with respect to the support base, and the rotation angle of the filtering bin, washing bin and drying bin is 0-360°.

Preferably, the filter bin and the drying bin are conical in design, and the size of the filtering bin and the drying bin are equal.

Preferably, the second motor and the first filter form a rotating structure, and the first filter and the rotating shaft are of an integrated structure.

Preferably, the leak hole diameter of the first filter screen is larger than the leak hole diameter of the second filter screen, and the area of ​​the first filter screen is smaller than that of the second filter screen.

Preferably, the hole diameter of the third filter screen is smaller than the hole diameter of the second filter screen, and the size diameter of the third filter screen is equal to the cross-sectional inner diameter of the washing chamber.

Cylindrical cone filter washing and drying device for lithium difluorophosphate Outstanding advantages:

Compared with the prior art, the beneficial effect of the utility model is: the lithium difluorophosphate uses a cylindrical cone filter washing and drying device, which realizes the integration of filtration, washing and drying, and is easy to operate, and is suitable for processing lithium difluorophosphate It is also more refined, saving manpower, improving processing efficiency and production quality. The function of the first motor drives the device to rotate, which is convenient for washing and drying lithium difluorophosphate. The function of the second motor drives the first filter screen and The rotation of the second filter screen facilitates finer filtration of lithium difluorophosphate, and avoids the accumulation of lithium difluorophosphate, which affects the filtering speed. The function of the third motor facilitates the rotation of lithium difluorophosphate and the replacement of positions. It is convenient to dry the washed lithium difluorophosphate.


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