Tin-Cobalt Electrode Composite for Higher Sodium-Ion Battery Capacity
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Solution Overview
Problem
Existing batteries using a tin-cobalt alloy as a negative electrode active material face limitations in capacity improvement.
Innovation Solution
An electrode composite material is developed, comprising a tin-cobalt alloy with a higher peak intensity of the CoSn2 phase than the CoSn phase in an XRD spectrum, along with a carbon material, to enhance battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a tin-cobalt alloy is used as a negative electrode active material, then the battery can operate with sodium ions, but the capacity is limited and cannot be sufficiently improved
Solution Approach 1:
The patent changes the phase composition parameters of the tin-cobalt alloy by controlling the peak intensity ratio of CoSn2 phase to CoSn phase in the XRD spectrum. By optimizing this phase ratio parameter, the battery capacity is significantly improved while maintaining good cycle characteristics, resolving the contradiction between capacity improvement and reliability maintenance.
Solution Approach 2:
The patent creates a composite electrode material consisting of tin-cobalt alloy phases (CoSn2 and CoSn) with specific phase ratios. This composite structure combines the advantages of different phases, where CoSn2 provides high capacity and CoSn contributes to structural stability, thereby achieving both improved capacity and maintained cycle characteristics.
2Quantity of substance
If the alloy composition is optimized to increase capacity, then the charge capacity improves, but the phase structure may become unstable
Solution Approach 1:
The patent optimizes the phase composition parameters by controlling the peak intensity ratio of CoSn2 phase to CoSn phase to be within a specific range (1.05 ≤ ratio ≤ 2.50). This parameter optimization ensures that the alloy achieves high charge capacity through increased CoSn2 content while the presence of CoSn phase maintains structural stability, preventing phase decomposition during cycling.
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 composite material significantly improves battery capacity without compromising cycle characteristics, as evidenced by increased charge capacity in sodium ion batteries.
Implementation Method 1
a battery using a tin-cobalt alloy as a negative electrode active material
Implementation Method 2
increase of the capacity... improved the capacity of a battery
Implementation Method 3
a carbon material, wherein the peak intensity of a CoSn2 phase is larger than the peak intensity of a CoSn phase
Data Source
AI summary
An electrode composite material of the present disclosure contains an alloy of tin and cobalt, and a carbon material. In the electrode composite material of the present disclosure, the peak intensity of a CoSn2 phase is larger than the peak intensity of a CoSn phase in an XRD spectrum, and the peak intensity of the CoSn2 phase is larger than the peak intensity of a Sn phase in the XRD spectrum. A sodium ion battery of the present disclosure includes a negative electrode active material layer containing the electrode composite material of the present disclosure, an electrolyte layer containing a sodium ion, and a positive electrode active material layer.