High-Ni Cathode Material Manufacturing Without Nickel Sulphate
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Solution Overview
Problem
The high processing cost and energy consumption associated with manufacturing positive electrode active materials for lithium-ion batteries using nickel sulphate, which requires purification and has a low nickel content, leading to increased greenhouse gas emissions and complex manufacturing steps.
Innovation Solution
A method involving the use of metal nickel powder, partially oxidized and mixed with lithium and other metal compounds, to produce a high-Ni content positive electrode active material with a layered structure, eliminating the need for acid dissolution and coprecipitation, thereby reducing energy consumption and greenhouse gas emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If nickel sulphate is used as a raw material for manufacturing positive electrode active material, then the manufacturing process can be established, but the processing cost increases and the manufacturing steps become complex
Solution Approach 1:
The invention extracts and eliminates the unnecessary intermediate steps of acid dissolution and coprecipitation from the conventional manufacturing process. By directly using metal nickel powder as the raw material, the process removes the complex nickel sulphate preparation steps while retaining the essential function of producing high-purity positive electrode active material.
Solution Approach 2:
Instead of following the conventional path of converting metal nickel to nickel sulphate and then to hydroxide through multiple steps, the invention inverts the approach by directly using metal nickel powder in the solid-state reaction process, thereby simplifying the manufacturing流程 while achieving the same or better results.
2Productivity
If nickel sulphate is used as a raw material, then the process can be completed, but the volume to be handled increases and transport cost increases
Solution Approach 1:
The invention changes the physical and chemical parameters of the raw material from nickel sulphate (aqueous solution or hydrate with low Ni content) to metal nickel powder (high purity, high density). This parameter change reduces the volume to be handled by approximately 70-80% while maintaining or improving the nickel content in the final product.
Solution Approach 2:
The invention uses metal nickel powder as a direct replacement for the multi-step nickel sulphate process, effectively making the intermediate compounds obsolete. This shortens the manufacturing cycle and reduces the volume of materials that need to be transported and handled at each stage.
3Ease of manufacture
If nickel sulphate is used as a raw material, then the manufacturing can proceed, but energy consumption increases and greenhouse gas emissions increase
Solution Approach 1:
The invention extracts and removes the energy-intensive acid dissolution and coprecipitation steps from the manufacturing process. By using metal nickel powder directly, the process eliminates the need for large amounts of acid and the subsequent neutralization and precipitation steps, thereby reducing energy consumption and greenhouse gas emissions.
Solution Approach 2:
The invention converts the potential harm of using simple metal nickel powder (which might be considered too simple or direct) into a benefit by demonstrating that this straightforward approach actually reduces overall energy consumption and environmental impact compared to the complex conventional process.
4Reliability
If high purity refined nickel is used to avoid impurities, then the quality of positive electrode active material is improved, but the processing cost increases
Solution Approach 1:
The invention extracts the essential function of using high-purity nickel while removing the complex processing steps (acid dissolution, coprecipitation) that increase cost. By using high-purity metal nickel powder directly, the process maintains material purity while simplifying the manufacturing process and reducing costs.
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
This method decreases the volume and energy required for manufacturing, simplifies the process, and significantly reduces greenhouse gas emissions while maintaining high capacity and discharge characteristics.
Implementation Method 1
the metal nickel powder is at least partially oxidized or a step for oxidizing the metal nickel powder is included
Data Source
AI summary
A method for manufacturing a positive electrode active material for a lithium-ion secondary battery, the method including: a step for firing mixed powder in which metal nickel powder, a compound containing Li, and a compound containing a metal element M other than Li and Ni are mixed to yield a positive electrode active material for a lithium-ion secondary battery, the positive electrode active material having a layered structure, wherein the amount of Ni in the total amount of metal elements contained in the positive electrode active material for a lithium-ion secondary battery is equal to or greater than 60% in terms of the atomic ratio, and the nickel powder is at least partially oxidized or a step for oxidizing said powder is included.