Positive Electrode Oxide Blend for Battery Cycle and Storage Stability
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Solution Overview
Problem
Conventional non-aqueous electrolyte secondary batteries require improvements in charge-discharge cycle characteristics and storage characteristics for enhanced performance, particularly in on-board and power storage applications.
Innovation Solution
The battery incorporates a positive electrode with a mixture layer comprising a first lithium-transition metal composite oxide (LixNi1−y−zCoyMzO2) and a second lithium-transition metal composite oxide (LiaNi2−a−bMebO2), along with a separator featuring a surface layer of inorganic particles and a binder, to enhance cycle and storage characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional positive electrode active materials are used, then the battery structure is simple, but the charge-discharge cycle characteristics and storage characteristics are insufficient
Solution Approach 1:
The patent employs composite materials by combining a first lithium-transition metal composite oxide (LixNi1-y-zCoyMzO2) and a second lithium-transition metal composite oxide (LiaNi2-a-bMebO2) in the positive electrode mixture layer. This composite structure improves charge-discharge cycle characteristics and storage characteristics while maintaining a manageable electrode composition.
2Reliability
If conventional positive electrode active materials are used, then the manufacturing process is simple, but the storage characteristics are poor
Solution Approach 1:
The patent employs composite materials by combining a first lithium-transition metal composite oxide (LixNi1-y-zCoyMzO2) and a second lithium-transition metal composite oxide (LiaNi2-a-bMebO2) in the positive electrode mixture layer. This composite structure improves storage characteristics while the manufacturing process remains feasible through conventional mixing and coating methods.
3Reliability
If the positive electrode uses only one type of lithium-transition metal composite oxide, then the electrode composition is simple, but the capacity maintenance is poor
Solution Approach 1:
The patent employs composite materials by combining a first lithium-transition metal composite oxide (LixNi1-y-zCoyMzO2) and a second lithium-transition metal composite oxide (LiaNi2-a-bMebO2) in the positive electrode mixture layer. This composite structure improves capacity maintenance while maintaining a relatively simple electrode active material composition.
4Reliability
If conventional separators are used, then the battery structure is simple, but side reactions occur reducing performance
Solution Approach 1:
The patent introduces a separator as an intermediary component between the positive and negative electrodes. This separator prevents direct contact between electrodes, inhibiting side reactions and improving performance stability while maintaining a simple overall battery structure.
Data Source
AI summary
This non-aqueous electrolyte secondary battery, which is one example of an embodiment, comprises: a positive electrode that has a positive electrode mixture layer; a negative electrode; a separator that is interposed between the positive electrode and the negative electrode; and a non-aqueous electrolyte. The positive electrode mixture layer contains a first lithium-and-transition-metal composite oxide represented by general formula LixNi1−y−zCoyMzO2 (in the formula, 0.8≤x≤1.2, 0≤y≤0.2, 0<z≤0.5, and M is at least one metal element excluding Li, Ni, and Co), and a second lithium-and-transition-metal composite oxide represented by general formula LiaNi2−a−bMebO2 (in the formula, 0<a≤0.5, 0≤b≤0.5, and Me is at least one metal element excluding Li and Ni). The separator has: a base material; and a surface layer that includes inorganic particles and a binder, and is formed on the surface of the base material facing toward the positive electrode.