Carbon-Coated Graphite Particles for Li-Ion Anode Output Control
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Solution Overview
Problem
Conventional carbonaceous substance-coated graphite particles used as negative electrodes in lithium ion secondary batteries often exhibit insufficient output characteristics.
Innovation Solution
The development of carbonaceous substance-coated graphite particles with specific characteristics, including a maximum particle diameter of 30.0 to 90.0 μm, pore volume of 0.009 to 0.164 cm3/g, and pore size distribution, along with optimized carbonaceous coating amounts and particle shapes, enhance the output characteristics when used as negative electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional carbonaceous substance-coated graphite particles are used as negative electrode material, then the basic battery function is achieved, but the output characteristics are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the pore volume (0.03-0.15 cm³/g) and pore size distribution (Pmax 3.0-5.0 nm) of the carbonaceous coatings. These specific parameter ranges optimize both the output characteristics and battery performance, resolving the contradiction between power and reliability.
Solution Approach 2:
The patent uses composite materials by combining graphite particles with carbonaceous substance coatings. This composite structure provides both the basic battery function of graphite and the enhanced output characteristics through the coating's controlled pore structure, simultaneously achieving improved power and reliability.
2Power
If carbonaceous coatings are applied to graphite particles to improve output characteristics, then power is enhanced, but electrolyte reaction may increase
Solution Approach 1:
The patent employs porous materials by creating carbonaceous coatings with controlled pore volumes (0.03-0.15 cm³/g) and specific pore size distributions. The porous structure allows optimized electrolyte access for enhanced power output while the controlled pore dimensions limit excessive electrolyte reaction, thus resolving the contradiction between power enhancement and harmful side reactions.
3Power
If the pore volume of carbonaceous coatings is increased to improve output characteristics, then power is enhanced, but the amount of carbonaceous substance increases
Solution Approach 1:
The patent applies parameter changes by optimizing the pore volume to a specific range (0.03-0.15 cm³/g) rather than simply increasing it. This controlled parameter adjustment achieves enhanced power output characteristics while limiting the amount of carbonaceous substance required, thus resolving the contradiction between power enhancement and material quantity.
Data Source
AI summary
Provided are carbonaceous substance-coated graphite particles that include: graphite particles; and carbonaceous coatings covering at least part of surfaces of the graphite particles, the carbonaceous substance-coated graphite particles have a maximum particle diameter of 30.0 to 90.0 μm, a pore volume Vs of pores with a pore size of 7.8 to 36.0 nm is 0.009 to 0.164 cm3/g, and in a pore size distribution graph with the pore size being plotted on a horizontal axis and a dV/dP value obtained by differentiating the pore volume with the pore size being plotted on a vertical axis, a pore size Pmax with which the dV/dP value is maximized is 2.5 to 5.5 nm.