Lithium-Ion Electrode Active Material Morphology Control
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Solution Overview
Problem
Current processes for producing lithium-ion battery electrode active materials often result in undesirable lumps and aggregates, affecting morphology and processability, leading to reduced cycle life and capacity retention.
Innovation Solution
A process involving a mixture of a precursor mixed oxide (Li1+xTM1−xO2) with a lithium compound and bromine or iodine, followed by heat treatment at 700 to 1000°C, to produce electrode active materials with improved morphology and reduced lumps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional thermal treatment is used to form electrode active material, then the material is produced, but lumps and aggregates form causing poor morphology and reduced processability
Solution Approach 1:
An organic compound containing halogen atoms (bromine or iodine) is introduced as an intermediary substance during thermal treatment. This intermediary prevents direct aggregation of metal oxide particles by interfering with particle-particle interactions, thereby eliminating lumps and aggregates while maintaining production efficiency
Solution Approach 2:
The invention changes the chemical environment parameters by introducing organic compounds with specific halogen atoms during thermal treatment. This parameter change modifies the surface chemistry and interaction forces between particles, preventing unwanted aggregation and improving morphology without requiring additional mechanical processing steps
2Manufacturing precision
If de-agglomeration steps are added to remove lumps, then morphology improves, but process complexity and production time increase
Solution Approach 1:
The organic compound with halogen atoms performs the dual function of both thermal treatment agent and anti-agglomeration additive. The material self-regulates its morphology during the standard thermal treatment process without requiring separate de-agglomeration equipment or additional processing steps, thereby maintaining simple process architecture while achieving excellent morphology
3Manufacturing precision
If de-agglomeration steps are added to remove lumps, then flowability improves, but productivity decreases
Solution Approach 1:
The organic compound is introduced before thermal treatment begins, performing preliminary anti-agglomeration action during the heating process itself. This prevents lump formation in the first place, ensuring excellent flowability is achieved inherently during production rather than requiring subsequent de-agglomeration steps, thereby maintaining high productivity
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 process yields electrode active materials with excellent morphology, narrow particle diameter distribution, and enhanced electrochemical performance, eliminating the need for de-agglomeration steps and improving specific capacity and capacity retention.
Implementation Method 1
Subjecting said mixture to heat treatment at a temperature in the range of from 700 to 1000° C.
Implementation Method 2
During the thermal treatment a solid state reaction takes place, and the electrode active material is formed.
Implementation Method 3
Contacting a mixture of (A) a precursor of a mixed oxide according to general formula Li1+xTM1−xO2... with (C) Br2, I2, or at least one compound selected from carbon perhalides... (b) Subjecting said mixture to heat treatment
Data Source
AI summary
Process for making an electrode active material for a lithium ion battery, said process comprising the following steps: (a) Contacting a mixture of (A) a precursor of a mixed oxide according to general formula Li1+xTM1−xO2, wherein TM is a combination of two or more transition metals selected from Mn, Co and Ni, optionally in combination with at least one more metal selected from Ba, Al, Ti, Zr, W, Fe, Cr, K, Mo, Nb, Mg, Na and V, and x is in the range of from zero to 0.2, and (B) at least one lithium compound, with (C) Br2, I2, or at least one compound selected from carbon perhalides selected from the bromides and iodides, and interhalogen compounds comprising bromine or iodine, and (b) Subjecting said mixture to heat treatment at a temperature in the range of from 700 to 1000° C.