What is a dry electrode mixing machine?

In the manufacture of solid-state battery electrodes, dry processes have attracted attention because they do not rely on solvents. The dry electrode mixing machine is one of the key pieces of equipment, as it determines whether the powder is mixed evenly, whether the binder can be fully fiberized, and whether the subsequent calendering film formation is stable.

I. What is a Solid-State Battery Dry Electrode Mixing Machine?

A solid-state battery dry electrode mixing machine is mainly used to uniformly mix and fiberize active materials, conductive agents, and binders such as PTFE without adding solvents, forming a dry powder mixture that lays the foundation for subsequent calendering and film formation. Unlike traditional wet mixing, its core is not just "mixing", but using high-speed rotation, shearing force and centrifugal force to stretch the PTFE binder into a three-dimensional fiber network, thereby improving the bonding ability between powders.

From a process perspective, dry electrode mixing machine requires balancing mixing uniformity, temperature control, and material protection. Especially for materials with high viscosity, fibrous texture, or large particle size differences, the equipment structure, rotation speed, and temperature control method will all affect the final mixing effect.

II. Why Dry Mixing deserves attention

In dry electrode manufacturing, insufficient mixing may lead to powder agglomeration, inadequate fiberization, or decreased electrode uniformity; excessive mixing may also affect the material state. Therefore, the equipment usually needs to have features such as adjustable speed, controllable temperature, and easy cleaning.

Taking Mikrouna's dry electrode mixing machine as an example, its effective mixing capacity is 2.5L. The material tank is made of SUS304 stainless steel with an inner diameter of φ280mm and a depth of 215mm, and is equipped with a jacket for cooling/heating. The mixing speed is 0-2540r/min for the paddle and 0-39r/min for the material tank. The mixing paddle motor is driven by a 3kW servo, and the opening and closing of the tank is driven by a 1.5kW hydraulic drive. The temperature control range is 15-50℃, it supports PLC programming, and the noise level is controlled at ≤85dB at a distance of 1 meter from the equipment.

III. How to interpret equipment parameters

When inspecting a dry electrode mixing machine, one cannot simply look at whether the rotation speed is high or low. Mixing capacity determines the single batch processing volume, the material and surface condition of the hopper affect the efficiency of cleaning and formula changing, jacket temperature control is related to the stability of the PTFE fiberization process, and vacuum options are related to easily oxidized materials. Structures such as multi-layered paddles and tipping discharge buckets can also affect mixing dead zones and ease of maintenance.

In actual selection, mikrouna's dry electrode mixing machine support on-demand customization, and the configuration can be adjusted according to process requirements such as formulation, temperature control, and vacuum. If enterprises have different capacity or production cycle requirements, they can also evaluate and adapt solutions according to specific scenarios.

IV. Application Scenarios and Selection Strategies

Dry electrode mixing machine can be used for mixing dry powder materials for lithium-ion/solid-state battery electrodes, and can also be used for dry mixing of high-uniformity functional powder materials in the chemical industry. When selecting a product, it is recommended to focus on the following: material characteristics, single batch capacity, temperature control range, whether vacuum is required, cleaning and production changeover frequency, and automation control requirements. For solid-state battery experimental and pilot production lines, parameter adjustability and ease of cleaning are often more important than simply pursuing large production capacity.

V. Conclusion

The solid-state battery dry mixer is not simply a powder mixing device, but a crucial process linking material formulation and electrode film formation.