Boron-Doped Carbon Negative Electrode for Li-Ion Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing negative electrode materials for lithium-ion batteries face challenges in achieving improved input characteristics without reducing discharge capacity density, particularly in graphite materials, where the proportion of boron in specific chemical states is not optimally controlled.
Innovation Solution
A negative electrode material is developed with a carbon material incorporating boron from a diboride source, where the ratio of the B1s peak area at 187.0-188.5 eV to the total B1s peak area is 50% or more, optimizing boron's chemical state to reduce electron density and enhance input characteristics without compromising discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If boron is added to carbon material to improve input characteristic, then input characteristic is improved, but discharge capacity density is reduced
Solution Approach 1:
The invention changes the chemical state parameter of boron by controlling the B1s peak area ratio to be 50% or more at binding energy of 187.0-188.5 eV. This specific parameter change optimizes the balance between improving input characteristic and maintaining discharge capacity density, resolving the contradiction by finding the optimal chemical state configuration of boron in the carbon material.
2Power
If boron content is increased to enhance input characteristic, then input characteristic is improved, but discharge capacity is reduced
Solution Approach 1:
Instead of simply increasing boron content, the invention changes the chemical state distribution parameter by controlling the B1s peak area ratio. This approach improves input characteristic while avoiding the reduction in discharge capacity that would result from merely increasing total boron content, thereby resolving the contradiction through parameter optimization rather than quantity increase.
3Power
If boron is incorporated into carbon material, then input characteristic is improved, but discharge capacity density is compromised
Solution Approach 1:
The invention optimizes the chemical state parameter of boron (B1s peak area ratio ≥50% at 187.0-188.5 eV binding energy) to achieve a configuration where boron incorporation improves input characteristic while maintaining discharge capacity density. This parameter optimization resolves the contradiction by finding the optimal chemical state that benefits both performance aspects.
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 optimized boron distribution in the carbon material improves the input characteristic of the negative electrode without reducing the discharge capacity density, leading to higher discharge capacity and improved battery performance.
Implementation Method 1
the boron source being a diboride. In a B1s spectrum of the carbon material which is measured by XPS, the ratio of the area of a peak that occurs at a binding energy of 187.0 eV or more and 188.5 eV or less to the total area of peaks that occur at a binding energy of 184.0 eV or more and 196.5 eV or less is 50% or more
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A negative electrode material includes a carbon material including boron. In a B 1 s spectrum of the carbon material which is measured by X-ray photoelectron spectroscopy, the ratio of the area of a peak that occurs at a binding energy of 187.0 eV or more and 188.5 eV or less to the total area of peaks that occur at a binding energy of 184.0 eV or more and 196.5 eV or less is 50% or more.