Method for evaluating dispersity of material in lithium ion battery pole piece
A lithium-ion battery, decentralized technology, applied in the field of lithium-ion batteries, can solve problems such as low safety factor, high cost, and complicated operation, and achieve the effects of high accuracy, fast testing, and low safety risk
Active Publication Date: 2020-12-11
HUBEI JINQUAN NEW MATERIALS CO LTD +1
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Problems solved by technology
[0007] Aiming at the problems of complex operation, high cost, and low safety factor in evaluating material dispersibility in the lithium-ion battery industry, the purpose of the present invention is to provide a method for evaluating material dispersibility in lithium-ion battery pole pieces
Method used
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Embodiment 1
[0055] A method for evaluating the dispersion of materials in lithium-ion battery negative electrode sheets:
[0056] S1. Stick the four corners of 100mm×186mm PET insulating film on the surface of 300mm×186mm copper foil, and then coat the evenly stirred negative electrode slurry (graphite: SP: CMC: SBR=95.7:1.5:1.2:1.6) on one side Spread on copper foil and PET insulating film, the coating width is 144mm, and the coating surface density is 68g / m 2 , bake at a certain speed through a six-section oven with fixed wind frequency and temperature field settings;
[0057] S2. Take the pole piece after drying, remove the part coated on the PET insulating film, cut it into a strip-shaped sample of 15mm×60mm, and record the weight in m a1 ;
[0058] S3. After selecting the CS10 grinding head as the test grinding head and installing it at the designated position of the friction and wear testing machine, grind the grinding head to a new surface on the sandpaper, and set the parameters...
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Abstract
The invention relates to a method for evaluating the dispersity of a material in a lithium ion battery pole piece. The slurry is coated on the surface of the foil and then baked, the baking process ofthe lithium ion battery pole piece can be simulated, the dispersion state of each component in the powder on the dried pole piece is close to the actual condition of the pole piece in the productionprocess of the lithium ion battery, then sampling is performed, and the powder wear rate of the slurry coating side and the powder wear rate close to the foil side are obtained through friction and test. According to the method for evaluating the dispersity of the material in the lithium ion battery pole piece, the cohesiveness between pole piece powder and powder is represented through a frictionand wear testing machine, operation and equipment are simple, testing is rapid, data can be quantified, and the safety risk is extremely low; in addition, after the powder of the pole piece is stripped by the stripping device, the wear rate of the powder close to the current collector side is tested and compared with the wear rate of the powder on the surface of the pole piece to evaluate the dispersion condition of each component in the powder at different positions of the pole piece, the method is simple and convenient, and the result is visual and reliable.
Description
technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for evaluating the dispersibility of materials in pole pieces of lithium-ion batteries. Background technique [0002] Lithium-ion batteries have outstanding advantages such as high energy density, environmental friendliness, high power density, long service life, wide operating temperature range, and low self-discharge rate, and are widely used in the new energy industry. The raw materials used for the positive electrode of lithium-ion batteries include positive active materials, PVDF, carbon nanotube conductive liquid, conductive agent (SP or KS-6, etc.) and solvent NMP, etc. The negative electrode slurry components mainly include graphite, conductive agent, CMC and SBR, etc. Among them, the carbon nanotube conductive liquid and the conductive agent can improve the conductivity of the pole piece. PVDF, CMC and SBR are respectively used as the b...
Claims
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Patent Timeline
Login to View More IPC IPC(8): G01N27/04G01N5/00G01N19/04
CPCG01N27/043G01N5/00G01N19/04Y02E60/10
Inventor 张欢刘范芬伍山松吕正中
Owner HUBEI JINQUAN NEW MATERIALS CO LTD