Li2NiCoMnTiO4 Cathode Material for Lithium Battery Capacity
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Solution Overview
Problem
Conventional lithium batteries with cathode active materials containing only one metal element, such as Mn, exhibit low charge-discharge capacity due to insufficient lithium ion diffusion paths, limiting their ability to diffuse a sufficient amount of lithium ions.
Innovation Solution
A cathode active material with a rock salt type crystal structure, represented by the composition Li2Ni1-x-yCoxMnyTiO4, where x and y are real numbers satisfying 0.1<x<0.8 and 0.1<y<0.8, incorporating nickel, cobalt, and manganese to enhance lithium diffusivity and increase charge-discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional cathode active materials containing only one metal element (such as Mn) are used, then the structure is simple, but the lithium ion diffusion paths are insufficient and charge-discharge capacity is low
Solution Approach 1:
The patent applies composite materials by combining multiple metal elements (Ni, Co, Mn, Ti) in a single cathode active material composition Li2Ni1-x-yCoxMnymTiO4. This composite approach creates synergistic effects where each metal element contributes different properties: Ni provides high capacity, Co enhances stability, Mn improves diffusion paths, and Ti strengthens the crystal structure. The result is a material with superior lithium ion diffusion capability and charge-discharge capacity compared to single-metal materials.
Solution Approach 2:
The patent applies local quality by assigning specific functional roles to different metal elements within the cathode material. Each metal element is positioned in the crystal lattice to perform its specialized function: Ni atoms occupy specific sites for electron transfer, Co atoms stabilize the local structure, Mn atoms create diffusion channels, and Ti atoms reinforce the overall framework. This localized functional distribution optimizes the overall performance.
2Speed
If cathode active materials with insufficient lithium ion diffusion paths are used, then the manufacturing process is simple, but the lithium ion diffusion efficiency is low
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the crystal structure parameters of the cathode material. By modifying the rock salt type crystal structure with specific metal element ratios (controlled by parameters x, y, z in the formula Li2Ni1-x-yCoxMnymTiO4), the patent optimizes the lithium ion diffusion paths. The crystal lattice parameters are tuned to create wider and more connected diffusion channels, enabling faster lithium ion transport while maintaining structural stability during charge-discharge cycles.
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 ternary cathode active material with nickel, cobalt, and manganese significantly increases lithium battery discharge capacity by providing more efficient lithium ion diffusion paths, exceeding the capacity of conventional batteries.
Implementation Method 1
Lithium ions (Li+) generated by the reaction of the formula (I) are transferred by electro-osmosis from the anode side to the cathode side
Implementation Method 2
a reaction represented by the following formula (I) proceeds at the anode, upon discharge: LixC6→6C+xLi++xe−
Data Source
AI summary
The present invention is to provide a cathode active material configured to increase, when used in a lithium battery, the discharge capacity of the lithium battery higher than conventional lithium batteries, and a lithium battery including the cathode active material. Presented is a cathode active material for lithium batteries, wherein the cathode active material is represented by the following composition formula (1) and has a rock salt type crystal structure including formula (1): Li2Ni1-x-yCoxMnyTiO4 wherein x and y are real numbers that satisfy x>0, y>0 and x+y<1.