Lithium Vanadium Oxide Anode Composition for Conductivity Balance
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Solution Overview
Problem
Lithium vanadium oxides have poor electron conductivity, leading to difficulties in achieving sufficient battery capacity when used as a negative electrode active material, and increasing the amount of conductive additives compromises ion conductivity and active material quantity.
Innovation Solution
A negative electrode material comprising lithium vanadium oxide, a sulfide solid electrolyte, and a conductive additive, with specific volume ratios to balance electron and ion conductivity, enhancing battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of conductive additive is increased to improve electron conductivity, then electron conductivity is improved, but ion conductivity decreases and battery capacity decreases
Solution Approach 1:
The patent introduces a coating layer as an intermediary substance between the lithium vanadium oxide particles and the conductive additive. This coating layer, composed of specific materials like LiNbO3, Li2SiO3, or their mixtures, mediates the interaction between the active material and conductive additive, allowing for reduced conductive additive content while maintaining electron conductivity. The coating layer provides conductive pathways and improves interfacial contact, enabling the system to achieve good electron conductivity without compromising battery capacity through excessive conductive additive addition.
2Quantity of substance
If the amount of electrolyte is decreased to increase active material content, then battery capacity is improved, but ion conductivity decreases
Solution Approach 1:
The patent employs a thin coating layer as a flexible interface between the active material particles and the electrolyte. This coating layer, with controlled thickness and composition, provides sufficient ionic pathways while minimizing the electrolyte volume required. The coating materials (LiNbO3, Li2SiO3, or their mixtures) form thin films that maintain ion conductivity without occupying excessive volume, thereby allowing higher active material content while preserving adequate ion transport channels.
3Quantity of substance
If the proportion of active material is increased to improve battery capacity, then battery capacity is improved, but electron conductivity decreases
Solution Approach 1:
The patent creates a composite structure where lithium vanadium oxide particles are coated with a specific layer (LiNbO3, Li2SiO3, or their mixtures). This composite material approach combines the high capacity characteristics of lithium vanadium oxide with the conductive properties of the coating materials. The composite structure ensures that even with high active material content, the electron conductivity is maintained through the conductive coating layer, which provides electron transport pathways at the particle surfaces and interfaces.
Data Source
AI summary
A negative electrode material 1000 of the present disclosure includes a negative electrode active material 111, a sulfide solid electrolyte 100, and a conductive additive 110. The negative electrode active material 111 includes a lithium vanadium oxide, a proportion of a volume of the negative electrode active material 111 to a sum of the volume of the negative electrode active material 111 and a volume of the sulfide solid electrolyte 100 is 40% or more and 80% or less, and a proportion of a volume of the conductive additive 110 to a sum of the volume of the negative electrode active material 111, the volume of the sulfide solid electrolyte 100, and the volume of the conductive additive 110 is more than 4.4% and 15% or less.