Hard Carbon Electrode Mixture With d-Block Oxides for Higher Capacity
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Solution Overview
Problem
There is room for improvement in the battery capacities of batteries that utilize hard carbon as the negative electrode active material.
Innovation Solution
An electrode mixture comprising hard carbon and a metal oxide, where the metal element is a period 4 d-block element, with a mass ratio of the metal oxide to the total mass of hard carbon and metal oxide less than 10%, enhances battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If hard carbon is used as the negative electrode active material, then the battery can operate with high capacity and light weight, but the battery capacity remains insufficient and requires improvement
Solution Approach 1:
The patent combines hard carbon with metal oxides (Fe2O3, TiO2, MnO2, NiO, CuO, or ZnO) to form a composite electrode material. The metal oxide components are incorporated at specific ratios (5-15 mass% of the total electrode material) to enhance the overall battery capacity while maintaining the structural integrity and electrochemical performance of the hard carbon matrix.
Solution Approach 2:
The patent optimizes the composition parameters by controlling the mass ratio of metal oxide to hard carbon within specific ranges (5-15 mass% metal oxide content). It also specifies particle size distributions (D50 values) and conductivity ratios to achieve optimal battery capacity performance.
2Quantity of substance
If metal oxide is added to the electrode mixture to improve capacity, then the battery capacity increases, but the device complexity increases due to additional materials and composition control
Solution Approach 1:
The patent employs metal oxides that serve multiple functions: they act as active materials for capacity enhancement, provide structural support to the electrode matrix, and improve electrical conductivity. This multi-functionality reduces the need for separate components and simplifies the overall electrode structure despite the added complexity of metal oxide incorporation.
Data Source
AI summary
An object of the present disclosure is to provide an electrode mixture that can improve battery capacity, and a battery comprising the electrode mixture. The electrode mixture of the disclosure comprises hard carbon. The electrode mixture of the disclosure comprises a metal oxide. The metal element constituting the metal oxide is a period 4 d-block element, and the ratio of the mass of the metal oxide with respect to the total mass of the hard carbon and metal oxide is less than 10 mass %. The battery of the disclosure comprises a negative electrode collector layer, negative electrode active material layer, electrolyte layer, positive electrode active material layer and positive electrode collector layer in that order, and either the negative electrode active material layer or the positive electrode active material layer comprises an electrode mixture of the disclosure.