Similar Soft Carbon Anode with Controlled Interlayer Spacing
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Solution Overview
Problem
Existing battery anode materials, such as soft carbon, hard carbon, and graphite, fail to achieve excellent physical properties due to limitations in layer spacing, particle size, and superposition conditions.
Innovation Solution
A method to manufacture an anode material with similar soft carbon by using isotropic coke, calcining, grinding, and heat-treating it between 2100°C to 2600°C to achieve a specific interlayer spacing and particle size, resulting in a material with improved graphitization and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional soft carbon, hard carbon, or graphite are used as anode materials, then the material structure is formed with conventional layer spacing, but the discharge capacity ratio and charge capacity ratio at high rates are limited
Solution Approach 1:
The patent changes the interlayer spacing parameter from conventional values to a specific range of 0.33798 nm to 0.33695 nm through controlled graphitization at 2100-2600°C. This parameter optimization enables high-rate charging (0.2 C to 10 C) while maintaining excellent capacity retention (88%-100%), resolving the contradiction between charging rate and interlayer spacing control precision.
2Reliability
If soft carbon with interlayer spacing of 0.370 nm to 0.400 nm is used, then the material has larger layer spacing, but the capacity retention at high temperature and cycling performance deteriorates
Solution Approach 1:
The patent optimizes the interlayer spacing parameter to 0.33798 nm to 0.33695 nm, which is smaller than conventional soft carbon (0.370-0.400 nm). This optimized parameter achieves excellent capacity retention of 99% to 90% after 200 to 600 cycles at 45°C, directly resolving the contradiction between reliability and high-temperature stability.
3Productivity
If conventional anode materials are used, then the particle size and superposition condition are limited by material conditions, but the overall physical properties and performance cannot be optimized
Solution Approach 1:
The patent controls particle size within 2 μm to 15 μm through grinding and classification processes, combined with optimized graphitization temperature (2100-2600°C). This parameter optimization achieves discharge capacity ratio of 100% to 97% at discharge rates of 0.2 C to 10 C, resolving the contradiction between productivity and manufacturing ease.
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 resulting anode material exhibits high-rate rapid charging capabilities, excellent storage performance at high and low temperatures, and a long charge-discharge cycle life, surpassing the performance of traditional anode materials.
Implementation Method 1
heating the isotropic coke through calcination
Implementation Method 2
heated to the heat treatment range from 2100 degrees Celsius to 2600 degrees Celsius to form a type of said similar soft carbon
Implementation Method 3
heated to the heat treatment range from 2100 degrees Celsius to 2600 degrees Celsius
Data Source
AI summary
The invention is a manufacture of the anode material with similar soft carbon and an application thereof, which includes: using the isotropic coke to be heated through calcining; using the isotropic coke after calcining and heating, and then crushing the isotropic coke into particulate form, using the isotropic coke in particulate form and heating it under the heat treatment range of 2100 degrees Celsius to 2600 degrees Celsius to form the similar soft carbon; and using the similar soft carbon after mixing and sieving, the similar soft carbon is used the particle mean size 2 μm to 15 μm as the anode material.