Cathode Material Composition for Low-Impedance Li-Ion Interfaces
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Solution Overview
Problem
The compatibility between cathode materials and electrolytes in lithium ion batteries is suboptimal, leading to interfacial impedances that affect lithiation and de-lithiation, thereby impacting rate and cycle performance.
Innovation Solution
A cathode material with a specific chemical formula Li6NiaCobMncM1xM2yM3zO2+r is developed, with controlled parameters such as oil absorption value, specific surface area, and tap density to enhance compatibility with electrolytes, reducing interface impedance and improving energy density and rate performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional cathode materials with various chemical groups in the surface coating layer are used, then the material can be manufactured with standard processes, but the compatibility with electrolyte is poor resulting in high interfacial impedance and affected lithiation/de-lithiation performance
Solution Approach 1:
The patent applies parameter changes by precisely controlling the chemical composition parameters (a, b, c, x, y, z) within specific ranges to optimize the cathode material formula Li6NiaCobMncM1xM2yM3zO2+r. This systematic parameter optimization improves electrolyte compatibility and reduces interfacial impedance while maintaining manufacturability through standard battery material synthesis processes
Solution Approach 2:
The patent uses composite materials by incorporating multiple metal elements (Ni, Co, Mn, and additional elements M1, M2, M3) in the cathode material formula. This multi-element composite approach creates a synergistic effect that enhances electrolyte compatibility and reduces interfacial impedance while maintaining processability through established composite material synthesis methods
2Reliability
If the surface property of the cathode material is optimized to improve compatibility with electrolyte, then lithiation and de-lithiation performance is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the surface coating layer composition within the formula Li6NiaCobMncM1xM2yM3zO2+r, where parameters a, b, c, x, y, z are controlled within specific ranges. This parameter optimization enhances lithiation and de-lithiation performance while avoiding complex multi-step surface treatment processes, maintaining manufacturing simplicity
3Power
If high energy density and fast charging performance are achieved through material optimization, then battery performance is improved, but the production cost increases
Solution Approach 1:
The patent applies parameter changes by optimizing the cathode material formula Li6NiaCobMncM1xM2yM3zO2+r within specific compositional ranges to achieve high energy density and fast charging performance. This parameter optimization enables improved battery performance using cost-effective synthesis methods and standard manufacturing processes, avoiding expensive complex fabrication techniques
Data Source
AI summary
A cathode material, a cathode slurry and a lithium ion battery provided. The cathode material has a general chemical formula of LiσNiaCobMncM1xM2yM3zO2+r, where 0.80≤σ≤1.20, a+b+c+x+y+z=1, 0.6≤a≤1.0, 0.0≤b≤0.10, 0.0≤c≤0.3, 0<x<0.3, 0<y<0.3, 0<z<0.3, −0.2<r<0.3, M1, M2, and M3 each independently include at least one of Al, Co, Zr, B, Ti, Ca, Ce, Zn, Cr, Mg, Y, La, Sr, Ba, W, Mo, Nb, Si and Sb, and M1, M2, and M3 are not identical to each other; the cathode material has an initial Coulombic efficiency denoted as E, an oil absorption value denoted as P mL/100 g, and a span of volume particle size distribution denoted as S, where S=(D90−D10)/D50. The cathode material satisfies the following relational expression: 1.0≤E*(P−20)+S≤8. In the technical solution provided, while improving the processability of the cathode material, the cathode material also achieves both high energy density and rate performance.