Spinel Lithium-Manganese Positive Electrode Manganese Elution Control
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries using spinel-type lithium-manganese-based composite oxides experience significant capacity deterioration upon repeated charging and discharging, despite previous attempts to address this issue with combinations of materials.
Innovation Solution
A positive electrode configuration incorporating a lithium-manganese-based composite oxide with a spinel-type crystal structure, combined with a lithium-nickel-based composite oxide and lithium phosphate, where the lithium-nickel-based composite oxide includes aluminum as an additive, and the content ratios of these components are optimized to enhance capacity deterioration resistance and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spinel-type lithium-manganese-based composite oxide is used as the positive electrode active material, then thermal stability and low cost are achieved, but significant capacity deterioration occurs upon repeated charging and discharging
Solution Approach 1:
The patent applies composite materials by combining spinel-type lithium-manganese-based composite oxide with lithium phosphate and lithium-nickel-based composite oxide to form a multi-component positive electrode active material system. This composite structure leverages the thermal stability and cost advantages of the spinel-type lithium-manganese-based composite oxide while incorporating lithium phosphate to suppress manganese elution and improve capacity deterioration resistance through synergistic effects among the components
Solution Approach 2:
Lithium phosphate serves as an intermediary substance in the composite positive electrode active material. It acts as a mediator that suppresses the harmful elution of manganese from the spinel-type lithium-manganese-based composite oxide during charging and discharging cycles, thereby protecting the electrode structure and improving capacity deterioration resistance without compromising the inherent advantages of the spinel-type material
2Reliability
If conventional techniques are used to combine spinel-type lithium-manganese-based composite oxide with lithium-nickel-based composite oxide, then some capacity deterioration is addressed, but sufficient suppression of capacity deterioration cannot be achieved
Solution Approach 1:
The patent creates a three-component composite material system consisting of spinel-type lithium-manganese-based composite oxide, lithium phosphate, and lithium-nickel-based composite oxide. This composite structure provides sufficient suppression of capacity deterioration through the synergistic interaction among all three components, with lithium phosphate playing a key role in suppressing manganese elution, while maintaining manageable material composition complexity through defined content ratio ranges
3Reliability
If the content ratio of lithium-nickel-based composite oxide is increased to improve capacity deterioration resistance, then higher capacity deterioration resistance is achieved, but initial resistance increases
Solution Approach 1:
The patent applies parameter changes by optimizing the content ratio of lithium-nickel-based composite oxide within a specific range (5-30 mass%) relative to the total positive electrode active material. This controlled parameter adjustment achieves sufficient capacity deterioration resistance while preventing excessive initial resistance increase. Additionally, the patent optimizes the lithium phosphate content ratio (0.2-10 mass%) to enhance capacity deterioration resistance through manganese elution suppression, thereby improving overall battery performance within defined compositional parameters
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 proposed configuration significantly improves capacity deterioration resistance and reduces initial resistance in non-aqueous electrolyte secondary batteries, while also reducing costs and improving thermal stability, by forming a coating film that suppresses manganese elution during charging.
Implementation Method 1
forming a coating film that suppresses manganese elution during charging
Implementation Method 2
an active material capable of occluding and releasing ions, which serve as charge carriers
Data Source
AI summary
Provided is a positive electrode using a spinel-type lithium-manganese-based composite oxide, which can impart, to a non-aqueous electrolyte secondary battery, excellent capacity deterioration resistance upon repeated charging and discharging. The positive electrode disclosed herein includes a positive electrode current collector and a positive electrode active material layer supported by the positive electrode current collector. The positive electrode active material layer includes a lithium-manganese-based composite oxide having a spinel-type crystal structure and including Mn, a lithium-nickel-based composite oxide including Li and Ni, and lithium phosphate.