Experimental Case: Artificial Graphite Pitch Liquid Coating on LC-50 — Fast-Charge Anode Trial Validated

LC-50 Liquid Coating System trial — artificial graphite pitch coating run

Artificial graphite powder for fast-charge lithium-ion anodes was carbon-coated using the LC-50 Liquid Coating System with a low-temperature pitch at a dosage of 3–6 wt%. Conventional dry-route coating at the customer’s facility produced non-uniform wall thickness and carried high energy overhead. In this trial, pitch was heated to 120–150°C, atomized, and delivered continuously via spray nozzle at 2–15 g/s onto graphite particles in active circulation, forming a uniform, controllable carbon shell in a single vessel. The customer conducted downstream performance testing, confirmed all targets were met, and placed a purchase order.

Challenge

Fast-charge graphite anodes operate under high lithium-ion flux during charge cycles. A carbon coating layer is required to stabilize the solid electrolyte interphase and reduce side reactions at the particle surface. For fast-charge applications, that layer must be thin, continuous, and consistent across every particle — local gaps or thick spots degrade rate capability and cycle life directly.

Conventional dry-route coating mixes solid pitch powder with graphite under mechanical force. Wall thickness is difficult to control because pitch distribution depends on particle-to-particle contact rather than liquid coverage. The high softening points of standard pitch grades also demand elevated process temperatures, raising energy costs per batch.

These two constraints — uncontrolled wall thickness and high energy consumption — are the primary pain points for customers scaling up fast-charge anode production.

Solution

The LC-50 Liquid Coating System resolves the dry-route limitations by delivering pitch in an atomized liquid state. Pitch is pre-melted externally and sprayed at a controlled flow rate onto graphite particles circulating inside the coating chamber. Coverage becomes a function of spray parameters rather than mechanical blending — enabling wall thickness that is both uniform and adjustable.

Material

Parameter	Value
Material	Artificial graphite (fast-charge anode grade)
Modifier	Low-temperature pitch
Pitch dosage (wt% of graphite)	3–6%

Equipment

Parameter	Value
System	LC-50 Liquid Coating System
Chamber total volume	122 L
Batch processing capacity	≤60 L
Drive motor	75 kW, variable-frequency controlled
Main shaft speed	987 rpm
Spray module operating temperature	120–150°C
Atomized spray rate	2–15 g/s

Procedure

The LC-50 was prepared and confirmed at operating temperature before the trial began. Rotor and spray sequences were managed through the integrated PLC and touchscreen control panel.

1. Feed: Artificial graphite was manually charged into the coating chamber through the top inlet port.
2. Low-speed premix: We set the rotor to low speed to circulate the graphite bed and bring it to a homogeneous, active state before spray introduction.
3. Spray coating: With low-speed circulation maintained, we activated the spray module. Pitch pre-heated to 120–150°C was atomized and delivered at 2–15 g/s into the particle stream — liquid contact at particle surfaces begins coating immediately.
4. High-speed coating and consolidation: After spray completion, we increased rotor speed. Higher centrifugal force drives the liquid pitch film to spread evenly and bond to each graphite particle under mechanical pressure.
5. Discharge: Once the coating cycle was complete, the pneumatically actuated outlet valve was opened and coated graphite was discharged for downstream carbonization.

Achievement

The coated graphite showed a uniform, continuous carbon shell on visual and microscopic inspection. In-chamber spray coating eliminated the bare-patch and thick-spot defects associated with the customer’s previous dry-route process.

The customer proceeded with downstream performance evaluation independently. All fast-charge targets were confirmed met, and the customer subsequently placed a purchase order for the LC-50 system — validating the trial result for their production application.

Item	Dry-Route Coating (Customer Baseline)	LC-50 Liquid Coating Trial
Pitch delivery method	Solid blending under mechanical force	Atomized spray at 120–150°C
Wall thickness control	Particle-contact dependent — difficult to control	Adjustable via spray rate (2–15 g/s)
Energy requirement	High (standard-grade pitch, high softening point)	Reduced (low-temperature pitch)
Coating uniformity	Non-uniform; bare patches observed	Uniform, continuous layer confirmed
Customer validation	Baseline	All targets met; purchase order placed

Tags

#ArtificialGraphite #PitchCarbonCoating #FastChargeAnode #LowTemperaturePitch #LithiumIonBattery

#TaixianLC50 #LiquidCoatingSystem #LC50

#InChamberSprayCoating #SingleVesselModification #DryRouteSurfaceModification

#HosokawaAlternative #NETZSCHAlternative #NaraAlternative

#BatteryMaterials #AnodeMaterials #SEIStabilization #EnergyStorage #GraphiteCoating