Method for manufacturing lithium ion battery cell by using nano silicon material
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A lithium-ion, nano-silicon technology, applied in circuits, electrical components, battery electrodes, etc., can solve problems affecting battery cycle stability, electrode material pulverization, etc.
Active Publication Date: 2022-07-22
安徽国洁新能源科技有限公司
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[0004]However, the silicon anode material has a relatively obvious volume expansion effect during the charging and discharging process, the volume change of silicon particles is relatively large (>300%), and the...
Method used
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Embodiment 1
[0034] Preparation of modified carbon black:
[0035]Add 6 g of sodium methylene dinaphthalene sulfonate into 1000 mL of deionized water, stir to dissolve, add 250 g of ground conductive carbon black (passed through a 100-mesh sieve), disperse under ultrasonic conditions for 25 min, and then add 25 g of polyethylene glycol, Raise the temperature to 75°C, stir and mix for 120 minutes, filter and dry to obtain modified carbon black.
Embodiment 2
[0037] Preparation of modified carbon black:
[0038] Add 6 g of sodium methylene dinaphthalene sulfonate into 1000 mL of deionized water, stir to dissolve, then add 250 g of ground conductive carbon black (passed through a 100-mesh sieve), disperse under ultrasonic conditions for 30 min, and then add 25 g of polyethylene glycol, Raise the temperature to 80°C, stir and mix for 120 minutes, filter and dry to obtain modified carbon black.
Embodiment 3
[0040] To prepare the conductive adhesive:
[0041] S1. Add 102g of polyoxypropylene glycol and 67g of trimethylolpropane polyethylene glycol monomethyl ether into a three-necked flask equipped with a reflux condenser and a thermometer, and dehydrate in a vacuum at 105°C for 1h;
[0042] S2. Add 22g of modified carbon black prepared in Example 1 and 154g of isophorone diisocyanate, heat up to 90°C, react for 3h, cool down to 40°C, add 8g of chain extender, react at 80°C for 2h, and then again Cool down to 40°C, add 0.6g dibutyltin dilaurate, heat up to 70°C, continue the reaction for 4h, cool down to below 50°C, and discharge;
[0043] S3, adding 0.4 times the mass of water under stirring at 350 r / min to emulsify, and then adding 0.1 times the mass of 2,2-dimethylolpropionic acid for post-expansion to obtain a polyurethane emulsion;
[0044] S4. 51 g of tragacanth gum is added to 90 g of polyurethane emulsion under stirring at 350 r / min, and mixed evenly to obtain a conductiv...
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Abstract
The invention discloses a method for manufacturing a lithium ion battery cell by using a nano silicon material, which belongs to the field of lithium ion batteries, and comprises the following steps: preparing a negative electrode by using a self-made conductive binder; preparing a positive electrode; and winding the positive electrode, the negative electrode and the diaphragm to obtain a pole group, and then putting the pole group into a shell, injecting liquid and sealing to obtain the lithium ion battery cell. According to the invention, through the self-made conductive binder, a spatial three-dimensional polymer network structure is formed on the surfaces of the binder nano silicon particles, so that the silicon negative electrode material has relatively strong mechanical properties, and the stability of the silicon negative electrode material in charging/discharging operation is remarkably improved; the conductive carbon black is uniformly bonded and dispersed in the binder, so that not only can the addition amount of free carbon black in the positive electrode slurry be reduced, but also a three-dimensional conductive network system can be formed, and excellent conductivity can be realized with a small amount, thereby effectively improving the capacity and power of a lithium battery cell.
Description
technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for making lithium ion batteries by using nano-silicon materials. Background technique [0002] Lithium-ion batteries have the advantages of high energy, long service life, high power tolerance, low self-discharge ratio, light weight, and environmental protection. They are widely used in various fields; at present, lithium batteries are widely used in digital products, power tools. , electric bicycles and electric vehicles, their energy density is increasing with the advancement of various material technologies and processes. The battery cell is the core part of the lithium-ion battery, which is divided into three types: aluminum shell battery, soft-pack battery (also known as polymer battery), and cylindrical battery. The structure of the lithium ion cell is mainly divided into five parts, namely the positive and negative pole pieces, the separator, the...
Claims
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