High-Nickel Cathode Core-Shell Doping for Cycle and Thermal Stability
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Solution Overview
Problem
Lithium-ion secondary batteries face challenges in achieving high energy density while maintaining cycling performance and storage performance, particularly with increasing nickel content in high-nickel positive electrode active materials, which affects structural stability and overall battery performance.
Innovation Solution
A modified high-nickel ternary positive electrode material is developed, comprising an inner core doped with Mo, Zr, Ti, Sb, Nb, Te, Mg, Al, Ca, Zn, and Sr, and a surface layer with Co, coated with a Co-containing compound, Al-containing compound, and B-containing compound, enhancing structural stability and reducing side reactions with the electrolyte.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If nickel content in high-nickel positive electrode active materials is increased to achieve high energy density, then energy density is improved, but structural stability deteriorates
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the inner core contains high-nickel ternary material (LiNi0.8Co0.1Mn0.1O2) for high energy density, while the outer shell contains aluminum compound and boron-containing compound for structural stability and protection. This allows different regions of the material to have different compositions optimized for their specific functions.
Solution Approach 2:
The patent uses composite materials by combining high-nickel ternary material with aluminum compound and boron-containing compound to form a composite electrode material. The composite structure integrates the high capacity of nickel-rich material with the stability and protective properties of aluminum and boron compounds.
2Quantity of substance
If nickel content is increased to improve capacity, then capacity is improved, but cycling performance deteriorates
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the inner core contains high-nickel ternary material (LiNi0.8Co0.1Mn0.1O2) for high energy density, while the outer shell contains aluminum compound and boron-containing compound for structural stability and protection. This allows different regions of the material to have different compositions optimized for their specific functions.
Solution Approach 2:
The patent uses composite materials by combining high-nickel ternary material with aluminum compound and boron-containing compound to form a composite electrode material. The composite structure integrates the high capacity of nickel-rich material with the stability and protective properties of aluminum and boron compounds.
3Quantity of substance
If nickel content is increased to improve capacity, then capacity is improved, but storage performance deteriorates
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the inner core contains high-nickel ternary material (LiNi0.8Co0.1Mn0.1O2) for high energy density, while the outer shell contains aluminum compound and boron-containing compound for structural stability and protection. This allows different regions of the material to have different compositions optimized for their specific functions.
Solution Approach 2:
The patent uses composite materials by combining high-nickel ternary material with aluminum compound and boron-containing compound to form a composite electrode material. The composite structure integrates the high capacity of nickel-rich material with the stability and protective properties of aluminum and boron compounds.
4Use of energy by moving object
If high-nickel ternary positive electrode material is used to improve energy density, then energy density is improved, but thermal stability deteriorates
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the inner core contains high-nickel ternary material (LiNi0.8Co0.1Mn0.1O2) for high energy density, while the outer shell contains aluminum compound and boron-containing compound for structural stability and protection. This allows different regions of the material to have different compositions optimized for their specific functions.
Solution Approach 2:
The patent uses composite materials by combining high-nickel ternary material with aluminum compound and boron-containing compound to form a composite electrode material. The composite structure integrates the high capacity of nickel-rich material with the stability and protective properties of aluminum and boron compounds.
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 modified material significantly improves cycling performance, thermal stability, and storage performance by synergistic doping and coating, leading to increased capacity and rate performance of lithium-ion secondary batteries.
Implementation Method 1
the inner core includes a high-nickel ternary positive electrode material matrix, the matrix being doped with M1, M2, and W
Implementation Method 2
the high-nickel ternary positive electrode material matrix is doped with three kinds of ions (namely M1, M2, and W) synergistically
Implementation Method 3
the surface layer of the high-nickel ternary positive electrode material is also doped with Co, so that an amount of high-valent nickel ions contained in the surface layer
Implementation Method 4
the high-nickel ternary positive electrode material is uniformly coated with an inner layer containing a Co compound and an outer layer containing an Al compound and a B-containing compound
Implementation Method 5
interface side reactions between the high-nickel ternary positive electrode material and the electrolyte can be further effectively inhibited
Data Source
AI summary
A modified high-nickel ternary positive electrode material includes an inner core and inner and outer coating layers. The inner core includes a high-nickel ternary positive electrode material matrix, the matrix being doped with M1, M2, and W. M1 is one of Mo, Zr, Ti, Sb, Nb, and Te. M2 is one of Mg, Al, Ca, Zn, and Sr. Chemical formula of the high-nickel ternary positive electrode material matrix is Li1+a[NixCoyMnzM1bM2cWd]O2. 0.65≤x<1, 0≤y<0.3, 0≤z<0.3, 0<a<0.2, 0<b<0.1, 0<c<0.1, 0<d<0.1, x+y+z+b+c+d=1. A surface layer of the inner core is further doped with Co. The inner coating layer is a Co-containing compound. The outer coating layer includes an Al-containing compound and a B-containing compound.