Battery Carbon Black Purification for Low-Nickel Conductivity
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Solution Overview
Problem
Conventional carbon black produced for secondary batteries has high purity but lacks suitable characteristics for conductive materials, leading to defects and inefficiencies in battery performance.
Innovation Solution
Carbon black with an oil absorption amount of 150 mL/100 g to 400 mL/100 g and a nickel content of 50 ppb or less, produced using a cylindrical cracking furnace and purification with a magnet to achieve a BET specific surface area of 35 m2/g to 400 m2/g, suitable for use as a conductive material in secondary batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If carbon black is produced by conventional high-purity production method, then purity is improved, but conductive characteristics for secondary batteries deteriorate
Solution Approach 1:
The patent changes the production parameters by using a cylindrical cracking furnace with specific temperature conditions (1000-1500°C) and controlling the composition of raw material gas (acetylene concentration 5-50 vol%), which produces carbon black with both high purity and excellent conductive characteristics suitable for secondary batteries
Solution Approach 2:
The patent replaces conventional mechanical purification methods with magnetic field-based purification using a magnet to remove nickel-containing particles. This substitution achieves higher purity (nickel content ≤50 ppb) while preserving the conductive characteristics of the carbon black
2Reliability
If nickel content is reduced to 50 ppb or less, then defect rate is improved, but production complexity increases
Solution Approach 1:
The patent extracts and removes nickel-containing magnetic particles from the carbon black production process by introducing a magnet into the purification step. This targeted extraction achieves nickel content ≤50 ppb without requiring complex multi-stage purification systems
Solution Approach 2:
The patent uses the magnetic properties of nickel-containing particles as a distinguishing parameter to separate them from carbon black particles. By applying a magnetic field during purification, the system efficiently removes nickel impurities while maintaining simple production流程和high defect rate reduction
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 carbon black effectively reduces nickel-based defects, enhances lithium ion supply, and improves dispersibility and conductivity, resulting in improved battery performance with reduced defects.
Implementation Method 1
a purification step of removing a magnetic foreign matter from the carbon black with a magnet
Data Source
AI summary
Carbon black in which an oil absorption amount is 150 mL/100 g or more and 400 mL/100 g or less and a nickel content that is measured by induced coupled plasma-mass spectrometry is 50 ppb or less.