Magnetic impurity filtering system used for producing lithium battery material

A technology of magnetic impurity and filtration system, applied in the fields of magnetic separation, solid separation, chemical instruments and methods, etc., can solve the problems of reducing the specific capacity and energy density of lithium battery materials, large content of magnetic impurities, and improving the self-discharge rate of finished batteries.

Inactive Publication Date: 2015-04-22
吴坚
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Lithium battery materials such as lithium iron phosphate, etc., in the production process, the positive electrode material slurry usually needs to be dried, because the slurry contains magnetic impurities such as iron phosphide (Fe2P), ferric oxide (Fe2O3) and elemental iron. The powder obtained after drying often also contains magnetic impurities, which eventually lead to excessive magnetic impurities in lithium battery products. The existence of these impurities will increase the self-discharge rate of the finished battery and reduce the specific capacity and energy density of lithium battery materials. , especially the side reactions such as the dissolution of impurity iron in the electrolyte will also affect the service life of the battery

Method used

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  • Magnetic impurity filtering system used for producing lithium battery material
  • Magnetic impurity filtering system used for producing lithium battery material
  • Magnetic impurity filtering system used for producing lithium battery material

Examples

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Embodiment 1

[0023] Such as figure 1 As shown, a magnetic impurity filtration system for the production of lithium battery materials described in the first embodiment of the present invention includes a feed port 1 and a discharge port 2, and a Two groups of filter tubes 3 are connected by a reversing pipeline 4 in the shape of "I" between adjacent filter tubes 3, and valves 5a are respectively provided on the four branch pipes 41 of the reversing pipeline 4; the two ends of the filter tubes 3 Valves 5b are respectively provided, and each set of filter tubes 3 includes at least one magnetic filter device 31 . The setting of the magnetic filter device can effectively filter the magnetic impurities in the slurry. The setting of multiple sets of filter tubes ensures a more thorough filtering effect. At the same time, considering that the magnetic filter device needs to be cleaned and replaced regularly, the reversing pipeline and the corresponding valve settings , to achieve flexible control...

Embodiment 2

[0035] Such as figure 2 As shown, the difference between the second embodiment and the first embodiment is that three sets of filter tubes 3 are arranged between the feed port 1 and the discharge port 2 . The working principle is the same as that of the first embodiment, only the change in the number of reversing pipelines to be operated will not be repeated.

Embodiment 3

[0037] Such as image 3 As shown, the difference between the third embodiment and the first two embodiments is that four sets of filter tubes 3 are arranged between the feed port 1 and the discharge port 2 . The working principle is the same as that of the first embodiment, only the change in the number of reversing pipelines to be operated will not be repeated.

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Abstract

The invention relates to a magnetic impurity filtering system used for producing a lithium battery material. The magnetic impurity filtering system comprises a feeding hole and a discharging hole, wherein at least two groups of filtering pipes are arranged between the feeding hole and the discharging hole; the adjacent filtering pipes are connected by a reversing pipeline; the reversing pipeline comprises four branch pipes and a main pipe connected with the four branch pipes; each branch pipe is provided with a valve; the four branch pipes are connected with the two ends of the adjacent filtering pipes respectively; each filtering pipe comprises a magnetic filtering device; and valves are arranged at the two ends of each filtering pipe respectively. Slurry enters from the feeding hole, sequentially passes through each magnetic filtering device and then flows out from the discharging hole, so that magnetic impurities in the slurry are effectively filtered; the plurality of groups of filtering pipes are arranged so that the filtering effect is more complete; meanwhile, the reversing pipelines and the valves are arranged so that the flowing direction of the slurry is flexibly controlled; and the appointed filtering pipe is temporarily closed at any time and the corresponding magnetic filtering device is cleaned and replaced under the condition of not affecting the integral running of the system, so that higher production efficiency is guaranteed.

Description

technical field [0001] The invention relates to a magnetic impurity filtering system, in particular to a magnetic impurity filtering system used in the production process of lithium battery materials before the drying of positive electrode material slurry. Background technique [0002] Lithium battery materials such as lithium iron phosphate, etc., in the production process, the positive electrode material slurry usually needs to be dried, because the slurry contains magnetic impurities such as iron phosphide (Fe2P), ferric oxide (Fe2O3) and elemental iron. The powder obtained after drying often also contains magnetic impurities, which eventually lead to excessive magnetic impurities in lithium battery products. The existence of these impurities will increase the self-discharge rate of the finished battery and reduce the specific capacity and energy density of lithium battery materials. , Especially the side reactions such as the dissolution of impurity iron in the electroly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03C1/02
Inventor 杭艳杨柯许世国崔伟超
Owner 吴坚
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