Mixed LMO Cathode Material for Battery Cycle Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium-ion battery cells for electric vehicles face challenges in achieving improved power capability, cycle life, and reduced cost, particularly in maintaining performance across a wide range of temperatures and during high-temperature cycling.
Innovation Solution
The use of a cathode active material comprising a mixture of lithium metal oxide (LMO) components prepared via spray-drying and co-precipitation techniques, specifically lithium nickel manganese cobalt oxide (NMC), which are combined and bound to a metallic surface, enhancing the material's tap density, surface area, and pore size for improved power retention and cycle life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single LMO component prepared via one technique is used, then the manufacturing process is simple, but the power capability and cycle life are limited
Solution Approach 1:
The patent combines two different LMO components (spray-dried and co-precipitated) into a single cathode active material composition. This merging of components from different preparation techniques creates a synergistic effect that improves power capability and cycle life beyond what either component can achieve alone, while maintaining a manageable manufacturing process through sequential mixing and coating steps
2Quantity of substance
If LMO components with high tap density are used, then the energy density is improved, but the surface area and pore size for ion transport are reduced
Solution Approach 1:
The patent applies local quality by using spray-dried LMO component primarily for the inner layer to provide high tap density and energy density, while using co-precipitated LMO component for the outer layer to provide high surface area and pore structure for ion transport. This spatial differentiation of material properties optimizes both energy density and electrochemical performance simultaneously
3Power
If the cathode material is optimized for high power capability, then the performance at various temperatures is improved, but the manufacturing cost increases
Solution Approach 1:
The patent optimizes the ratio of spray-dried to co-precipitated LMO components to achieve the desired power capability while controlling manufacturing costs. By adjusting compositional parameters and processing conditions (such as coating thickness and drying temperature), the patent achieves high power capability across various temperatures without proportionally increasing manufacturing complexity
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 mixed LMO components result in a more robust cathode active material that enhances power capability at various temperatures, reduces cycle fade, and improves power retention, leading to better overall battery performance.
Implementation Method 1
a first lithium metal oxide (LMO) component prepared via a spray-dry technique
Implementation Method 2
a second LMO component prepared via a co-precipitation technique
Data Source
AI summary
A material includes a first lithium metal oxide (LMO) component formed using a spray-dry technique and a second LMO component formed using a co-precipitation technique. In particular, the LMO components may include lithium nickel manganese cobalt oxide (NMC). The material may further include a binder and a conductive component.