Coated Lithium-Manganese Rich Cathode for Voltage Decay Control
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Solution Overview
Problem
Lithium-manganese rich materials used in lithium-ion batteries undergo structural transformation during cyclic processes, leading to voltage decay and reduced energy density, hindering their commercial application.
Innovation Solution
A lithium-manganese rich material comprising a matrix with a specific chemical formula and a coating layer, where the matrix is represented by Li1.2+x[(Mn1-a-b-cCOaNibMc)1-dM′d]0.8−xO2 and the coating layer by Liu(Li1-v-γNvN′γ)O2, with a weight ratio of matrix to coating layer ranging from 100:0.01 to 100:10.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium-manganese rich material is used as cathode material, then high specific capacity (>250 mAh/g) is achieved, but structural transformation from layered to spinel structure occurs during cyclic process causing voltage decay
Solution Approach 1:
The cathode material is divided into two functional parts: a lithium-manganese rich matrix providing high capacity and a surface coating layer preventing structural transformation. This segmentation allows each part to fulfill its specific function independently, resolving the contradiction between high capacity and structural stability.
Solution Approach 2:
The invention creates a composite material system combining the lithium-manganese rich layered structure with a protective coating layer. This composite structure maintains the high specific capacity of the matrix while the coating prevents Jahn-Teller distortion and spinel transformation, thereby resolving the contradiction between capacity and stability.
2Quantity of substance
If lithium-manganese rich material is used, then high specific capacity is achieved, but energy density is reduced due to voltage decay
Solution Approach 1:
By segmenting the material into capacity-providing matrix and performance-preserving coating, the invention maintains high specific capacity while preventing voltage decay, thereby preserving energy density throughout the battery's cycle life.
Solution Approach 2:
The coating layer is applied in advance to the matrix surface before battery operation. This preliminary protective action prevents structural transformation and voltage decay from occurring, ensuring that high energy density is maintained throughout the cycling process.
3Quantity of substance
If lithium-manganese rich material is used, then high specific capacity is achieved, but commercial application becomes difficult due to voltage decay and reduced energy density
Solution Approach 1:
The segmented structure with protective coating isolates the lithium-manganese rich matrix from detrimental environmental interactions, preventing voltage decay and maintaining reliable performance characteristics required for commercial battery applications.
Solution Approach 2:
The composite material system combines the high-capacity lithium-manganese rich phase with a stable coating phase, creating a reliable cathode material that maintains consistent voltage and energy density, thereby enabling commercial application.
Data Source
AI summary
The present disclosure discloses a lithium-manganese rich material and a preparation method and a use thereof.