A method for forming pole pieces of aqueous ion batteries based on polytetrafluoroethylene binder

A technology of polytetrafluoroethylene and ion batteries, which is applied in the direction of electrode forming, battery electrodes, batteries, etc., can solve the problem that it is difficult to accurately control the quality and thickness of pole pieces, it is difficult to adopt dry pressing molding process for thick pole pieces, and it is difficult to obtain battery consistency Guarantee and other issues, to achieve significant practical value, good application prospects, and improve the effect of electrochemical performance

Active Publication Date: 2021-08-31
BENAN ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the thick pole piece design, the choice of PTFE as the binder has a series of advantages that other binders do not have, such as making the pole piece powder have a fiber network structure, high porosity, high compressibility, excellent Acid and alkali corrosion resistance, no aging, resistance to kneading and denaturation, not easy to drop powder, high tensile strength and other characteristics, but it is very challenging to realize the industrialized mass production of pole pieces
PTFE is used as the binder system of water-based ion batteries, and 60% PTFE emulsion is commonly used as the electrode binder. The difficulty is that irreversible condensation usually occurs during the stirring and mixing process, resulting in poor fluidity of the slurry and poor mixing uniformity. , secondly, due to the difficulty in solving the problem of poor powder fluidity caused by PTFE, it is difficult to adopt a dry pressing molding process for the production of thick pole pieces. It is difficult to accurately control the quality and thickness of the electrode sheet by rolling and forming, and it is difficult to control the ratio of positive and negative electrodes of the battery, which has a great impact on battery performance, and it is difficult to guarantee the consistency of the battery.
Therefore, there are few literature reports on the large-scale industrial production of thick battery pole piece design using PTFE as the binder of aqueous ion batteries.

Method used

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  • A method for forming pole pieces of aqueous ion batteries based on polytetrafluoroethylene binder
  • A method for forming pole pieces of aqueous ion batteries based on polytetrafluoroethylene binder
  • A method for forming pole pieces of aqueous ion batteries based on polytetrafluoroethylene binder

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Embodiment 1

[0045] 60g of positive electrode ceramic powder λ-MnO 2 , Inorganic carbon source 10g carbon black, 15g activated carbon, 10g natural graphite powder as raw material, use deionized water as solvent, control the solid content of powder to be 30wt.%, use zirconia as ball milling beads, material-ball ratio 1: 5. The high speed of the coarse mill is 120 rpm / min for 2 hours to obtain a uniform slurry. Continue to add 5wt.% PTFE binder (different amounts of binder added have different effects on pores, see Table 1), further ball mill at 300 rpm for 5 hours, and pour out the slurry. Filter the obtained slurry with plate-and-frame filter press equipment to obtain a filter cake, and further oven-dry the obtained filter cake, set the temperature at 110°C, and place it for 12 hours to obtain a dry block material, and dry the obtained The material is mechanically granulated, and sieved by vibration with a 3mm mesh to obtain a granular powder with uniform particle size, which is convenien...

Embodiment 2

[0052] 70g of positive electrode ceramic powder LiMn 2 o 4 , Inorganic carbon source 5g carbon black, 5g activated carbon, 10g artificial graphite powder is raw material, uses deionized water as solvent, the solid content of control powder is 30wt.%, uses zirconia as ball milling beads, material-ball ratio 1: 6. Coarse mill high-speed 200 rpm / min ball mill for 4 hours to obtain uniform slurry. Continue to add 10wt.% PTFE binder, further ball mill at 250 rpm for 3 hours, and pour out the slurry. Filter the obtained slurry with plate-and-frame filter press equipment to obtain a filter cake, and further oven-dry the obtained filter cake, set the temperature at 110°C, and place it for 12 hours to obtain a dry block material, and dry the obtained The material is granulated by a swinging granulator, vibrating and sieved with a 1mm mesh to obtain a granular powder with uniform particle size, which is convenient for further electrode sheet forming, and the obtained granular powder i...

Embodiment 3

[0055] 60g negative electrode ceramic powder NaTi 2 (PO4) 3 , 10g of carbon black as an inorganic carbon source, 15g of natural graphite powder as raw materials, using deionized water as a solvent, controlling the solid content of the powder to 60wt.%, using zirconia as ball milling beads, the ratio of material to ball is 1:3, coarse grinding Machine high speed 100 rpm / min ball mill for 5h to obtain uniform slurry. Continue to add 15wt.% PTFE binder, further ball mill at 300 rpm for 2 hours, and pour out the slurry. Filter the obtained slurry with plate-and-frame filter press equipment to obtain a filter cake, and further oven-dry the obtained filter cake, set the temperature at 110°C, and place it for 12 hours to obtain a dry block material, and dry the obtained The material is mechanically granulated, and sieved by vibration with a 2mm mesh to obtain a granular powder with uniform particle size, which is convenient for further electrode sheet forming. The obtained granular...

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Abstract

The invention relates to a pole piece forming method of a water-based ion battery based on a polytetrafluoroethylene binder, comprising: step 1) using ceramic powder and an inorganic carbon source conductive agent as raw materials for the electrode of the water-based ion battery, and using water as the Solvent, add polytetrafluoroethylene as a binder, and ball mill to obtain a uniform slurry; step 2) filter the obtained slurry to obtain a filter cake, and further dry the obtained filter cake to obtain a dry powder; step 3) The obtained dry powder is granulated and sieved to obtain a granular powder with uniform particle size; Step 4) The obtained granular powder is prepared in batches for battery pole pieces by dry pressing. The present invention adopts the method of ball milling to make slurry and joint granulation, and the obtained powder is in the form of granules, which greatly improves the fluidity problem of the powder caused by the binder, and makes the forming of the pole piece easy to control, so it is suitable for dry pressing. Produce thick pole pieces.

Description

technical field [0001] The invention relates to a pole piece forming method based on polytetrafluoroethylene (PTFE) binder as a water-based ion battery, in particular to a method of mixing by ball milling, conventional drying and granulation, combined with automatic weighing by powder automatic tablet forming machine The system control and batch pole piece production process belong to the field of ceramic powder materials. Background technique [0002] Low-cost electric energy storage systems are currently being rapidly developed under the impetus of the new energy field. It is estimated that the global annual market demand for batteries is about 15 billion US dollars. In terms of industrial batteries, such as: for UPS, power quality regulation , Backup batteries, etc., the total market volume can reach 5 billion US dollars. In the United States, Europe and Asia, a group of high-performance storage battery companies are being established to produce power system energy stora...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/04H01M10/36H01M4/02
CPCH01M4/02H01M4/0433H01M4/623H01M10/36H01M2004/021H01M2220/10Y02E60/10
Inventor 曾诗蒙刘宇贺诗阳张永献贺健夏骥张娜李录平
Owner BENAN ENERGY
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