A kind of lithium-ion battery silicon-based negative electrode composite binder and its preparation method and application
A lithium-ion battery, silicon-based negative electrode technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low viscosity and unsuitability of polyionic liquids
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Embodiment 1
[0032] Embodiment 1 prepares polyionic liquid (PIL / TFSI)
[0033] (1) Acetic acid (4mL) and 2,2'-(ethylenedioxy)bis(ethylamine) (4.89g, 33mmol) were dissolved in deionized water (10mL) to obtain solution A, which was added to a round bottom flask, The round bottom flask was placed in an ice-water bath; then formaldehyde (2.5ml) and glyoxal (4.85ml) were mixed in advance to obtain solution B, and solution B was added dropwise to the above round bottom flask under stirring to obtain solution C;
[0034] (2) After the dropwise addition, transfer the round-bottomed flask to an oil bath, condense and reflux the solution C at 100°C for 1 hour, then cool the entire reaction device at room temperature, and distill under reduced pressure at 80°C to remove excess solvent and reactant, and washed several times with acetone to obtain the product PIL / AcO with a yield of 81%. ;
[0035] (3) Dissolve 2g LiTFSI in 100mL water to obtain a LiTFSI solution, dissolve 1g PIL / AcO prepared in step...
Embodiment 2
[0044] Example 2 with PAAH 0.8 – Li 0.2 Preparation of Lithium Batteries with Composite Binder of PIL / TFSI
[0045] Weigh PAAH according to the mass ratio of 3:1 0.8 – Li 0.2 (average molecular weight 450,000) and PIL / TFSI, dissolve it in DMSO solvent, heat and evaporate to remove the solvent, and obtain a composite binder; then nano-silicon particles, conductive agent carbon black (Super-P) and composite binder The binder is dispersed in NMP with a mass ratio of 8:1:1, and a uniform slurry is formed by grinding and stirring, and coated on the copper foil. Then place the pole pieces in a drying oven, dry them at 80°C for 36 hours, cut them into circular electrode pieces with a diameter of 1 cm, and store them in a glove box. A lithium sheet was used as the counter electrode to assemble a 2032 button cell. Among them, the electrolyte uses 1M LiPF 6 It is an EC / DMC / DEC solution with a volume ratio of lithium salt of 1:1:1. The assembled battery is left to stand for 12 hour...
Embodiment 3
[0046] Example 3 with PAAH 0.8 – Li 0.2 Preparation of Lithium Batteries with Composite Binder of PIL / TFSI
[0047] Weigh PAAH according to the mass ratio of 2:1 0.8 – Li 0.2 (average molecular weight 450,000) and PIL / TFSI, dissolve it in NMP solvent, heat and evaporate to remove the solvent, and obtain a composite binder; then nano-silicon particles, conductive agent carbon black (Super-P) and composite bond The agent is dispersed in NMP with a mass ratio of 8:1:1, and a uniform slurry is formed by grinding and stirring, and coated on copper foil. Then place the pole piece in a drying oven, dry it at 80°C for 36h, then cut it into a circular electrode piece with a diameter of 1cm, and store it in a glove box. A lithium sheet was used as the counter electrode to assemble a 2032 button cell. Among them, the electrolyte uses 1M LiPF 6 It is an EC / DMC / DEC solution with a volume ratio of lithium salt of 1:1:1. The assembled battery is left to stand for 12 hours, and the batt...
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