Grounded Jet Mill for Sulfide Electrolyte Static Control

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Solution Overview

Problem

Conventional jet mills used for pulverizing sulfide-based solid electrolytes face issues with static electricity generation, leading to particle agglomeration and reduced pulverization efficiency.

Innovation Solution

A jet mill design that grounds the upper and lower portions of the milling main body to remove static electricity, combined with the use of an ionizer in the raw material supply pipe to prevent particle accumulation due to static charges.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a conventional jet mill is used to pulverize sulfide-based solid electrolyte, then particle size control is achieved, but static electricity causes particle agglomeration and sticking to the milling main body

Engineering Contradiction:

Improveparticle size controlVSAvoidstatic electricity

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent extracts and removes the harmful static electricity from the milling environment by introducing an ionizer that generates ions to neutralize charged particles. The ionizer is positioned to blow ions into the milling chamber, actively removing static electricity that causes particle agglomeration and sticking, thereby resolving the contradiction between achieving particle size control and eliminating static electricity harmful effects.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces ions as an intermediary substance to mediate between the charged particles and the milling environment. The ionizer generates positive and negative ions that act as intermediaries to neutralize the static charge on pulverized particles, preventing agglomeration and sticking while allowing the pulverization process to continue effectively.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If ball mill is used for solid electrolyte pulverization, then particle size can be reduced, but processing time becomes excessively long and carbon compounds form

Engineering Contradiction:

Improveparticle sizeVSAvoidprocessing time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent replaces the mechanical ball mill system with a jet mill system that uses high-velocity gas flow for pulverization. Instead of relying on mechanical impact from grinding balls over extended periods, the jet mill uses pneumatic energy to accelerate particles and achieve size reduction in a fraction of the time, eliminating the time loss and carbon compound formation associated with prolonged mechanical milling.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the fundamental pulverization parameter from mechanical force to pneumatic kinetic energy. By using high-velocity gas streams to accelerate and collide particles, the system achieves rapid size reduction without the time-consuming mechanical grinding process, thereby resolving the contradiction between achieving fine particle size and minimizing processing time.

Inventive Principle:

Principle #35Parameter changes

3Object-generated harmful factors

If ionizer is added to remove static electricity, then particle agglomeration is prevented, but device complexity increases

Engineering Contradiction:

Improveparticle agglomerationVSAvoiddevice structure

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The patent integrates the ionizer function into the existing jet mill structure, allowing the same device to perform both pulverization and static electricity removal functions. The ionizer is positioned to utilize the existing gas flow path, enabling multi-functionality without requiring completely separate systems, thereby reducing the impact on device complexity while effectively preventing particle agglomeration.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively prevents particle agglomeration and sticking to the milling main body, facilitating better particle size control and increasing pulverization efficiency and productivity.

Implementation Method 1

a predetermined ionizer is installed in the raw material supply pipe to supply the raw material to the raw material input holes of the upper plate and supply ionized air together

Methodology Applied

Scientific EffectIonization: Ionisation

Implementation Method 2

grounding upper and lower portions of the milling main body to remove static electricity inside the milling main body

Methodology Applied

Scientific EffectElectrostatic neutralization: Electrostatic Induction

Data Source

PatentUS20250099971A1Jet mill and method of pulverizing sulfide-based solid electrolyte using the same

Publication Date: 2025.03.27 ECOPRO BM CO LTD

AI summary

In a jet mill capable of removing static electricity according to the present disclosure, a raw material is fed into a hollow milling main body through a predetermined raw material supply pipe from a raw material supply unit, the raw materials are pulverized by collision with each other due to a strong jet air sprayed from an air nozzle installed in the milling main body when the raw materials fed into the above milling main body fill the milling main body to a certain height or higher, and upper and lower portions of the milling body are grounded to remove static electricity inside the milling main body.