Solvent-Free Manufacturing of Electrodes for Lithium-ion Batteries - lithium ion battery manufacturers

Lithium-ion battery electrodes are manufactured using a new completely dry powder spraying process.
Solvent for conventional slurry-
The casting electrode has been completely removed.
Due to the time required for the slurry and the solvent evaporation process with high resource requirements, the thermal activation time is greatly shortened
Manufacturing of casting electrodes replaced by hot rolling process.
It has been found that the thermal activation time takes only a few seconds to induce the mechanical binding of the thermoplastic polymer with the remaining active electrode particles.
The removal of solvent and the drying process allows for large-scale Li-
In the automotive energy storage system and other markets, the production of ion batteries will be more economical and feasible.
By understanding the surface energy of various powders that control the mixing of powders and the distribution of adhesives, dry-
The particles deposited on the collector indicate that the bonding strength is greater than that of the slurry-
Casting electrode, 148.
Compared to 84, 8kpa kpa. 3u2009kPa.
The electrochemical test shows that the new electrode is better than the conventional slurry treatment electrode due to the different distribution of adhesive.
In the BeadBug micro-tube homogenizer (benchmark science), dry cathode materials LCO (MTI), Super C65 carbon black (Timcal), and polypartial benzene (m for 30 minutes at 2800 RPM.
For a cathode made with NMC (Umicore), the same mixing parameters are used.
Details about mixing and mixing time effects can be found in.
After mixing, add the powder to the fluidized bed spray chamber.
When the inlet pressure of the carrier gas is set to 20 psi, the fluid bed chamber is fed into a spray system with an electrostatic voltage set to 25 kv.
The distance from the deposition head to the grounded aluminum current collector remains constant at 1. 5 in.
The surface morphology of deposited materials was studied using Helios NanoLab dual beams with emission current of 11 pa and 5 kv acceleration voltage.
Details about spray behavior in spray setup configuration, thickness control, and material composition can be found in.
According to the following equation, the pore rate of the sprayed (or cast) electrode is determined by considering the theoretical density of the mixture (active material, carbon black and adhesive.
Where T is the thickness of the electrode laminate (no aluminum foil collector), S is the weight of the laminate for each area, W, W, W is the weight percentage of the active material, Poly diammonium adhesive and C65 in the electrode lamination material, while D and D are LCO (or Li [NiCoMn] O), respectively) the real density of Poly disodium and C65.
The theoretical density of LCO (or NMC) active materials is 5. 1 (or 4. 68), 1. 78, and 2.
They are 25g cm.
Assuming that the weight fraction and density of each material are not changed due to the manufacturing process, all void degrees are calculated.
In general, about 30% of the electrodes have good electrical properties.
For early mechanical bonding tests, the coating current collector is placed on the hot plate for 1 hour at 250 °c.
The hot roller is used for heat activation and for increasing the density of electrode materials.
The bottom roller temperature is set to 190 °c and the top roller temperature changes from 100 °c to 175 °c.
Feeding rate of 30, 120 and 225/min. were used. A Mark-
10 Series 4 force gauge paired with Mark-
10 ES10 manual handwheel test brackets for determining the bonding strength of the coated electrode material.
In order to test the length, the coating current collector is installed on the base of the test stand, and the center of the coating area is directly under the force gauge. A 0. 5 in.
Diameter flat head (Mark-
10) attach to the force gauge with a double sided tape (7mm × 12mm) attached to the flat head.
The force gauge is lowered until the flat head touches the substrate and is compressed to 50 n.
After compression, the force gauge is lifted at a speed of 1 rotation in 20 seconds until the tape connected to the flat head is decoupled from the coating area.
By merging the known contact area of the tape, the maximum pulling force is recorded and converted to the maximum strength.
Dry Spray electrode chemical test of Li foil in Swagelok battery with stainless steel
Steel current collector.
A collector is covered by a piece of Li foil and two Celgard 2500 micro-hole membrane separators are placed on the Li foil.
Then, center a piece of cathode material on the separator and seal the battery to ensure a good contact between the cathode and another collector.
The battery was prepared with 1 µm LiPF6 in ethylene carbonate (EC), Diester carbonate (December) and Diester carbonate (DMC) (1:1:1) as electrolyte.
Each battery uses the galvanostat/potentistat/impedance analyzer (Bio-logic VMP3).
The battery is charged to 4 for rate performance.
2 V and discharge to 2.
5 u2009 v is like 0 at various rates. 1u2009C, 0. 2u2009C, 0.
5 u2009 C 1 u2009 C 2 u2009 C 3 u2009 C and 5 u2009 C.
The battery is charged to 4 for bike performance.
2 V and discharge to 2. 5u2009V at 0. 5u2009C.
Constant current charge and discharge are used for all tests.
The electrical impedance spectrum was measured from 0.
The 10-inch mV AC signal is used from 1-inch Hz to 200 KHz.