Composite Lithium Anode with Joule-Heated Carbon-Metal Layer
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Solution Overview
Problem
The reversibility and life of lithium ion batteries are reduced due to the growth of lithium dendrites and changes in the volume of the anode during charging and discharging, leading to reduced energy density and shortened battery life.
Innovation Solution
A method of manufacturing a composite anode for lithium ion batteries involves forming a carbon-modified layer, adding a metal catalyst precursor solution, forming a carbon-metal catalyst composite layer through Joule heating, and impregnating lithium metal to create an impregnation layer with a predetermined thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is impregnated into the anode to increase capacity, then energy density is improved, but lithium dendrite growth occurs reducing reversibility and battery life
Solution Approach 1:
A carbon layer is introduced as an intermediary between the lithium metal and the electrolyte. This carbon layer allows lithium ions to pass through while preventing direct contact between lithium metal and the electrolyte, thereby suppressing dendrite formation and improving battery reversibility and life while maintaining high energy density
Solution Approach 2:
The anode is designed as a composite structure combining lithium metal impregnated in a carbon-containing layer. This composite structure integrates the high capacity of lithium metal with the protective and conductive properties of carbon, achieving both high energy density and improved reliability
2Reliability
If the anode volume expansion is reduced to improve stability, then battery life is improved, but electrodeposition density decreases reducing energy density
Solution Approach 1:
The carbon layer is designed with specific local properties - it has controlled thickness and carbon content to provide local protection against volume expansion while maintaining sufficient porosity and conductivity for high lithium electrodeposition density, thus achieving both improved battery life and high energy density
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
This approach results in a composite anode with improved lithium electrodeposition density and reversibility, leading to a lithium ion battery with high capacity and enhanced life stability.
Implementation Method 1
forming a carbon-modified layer by first heat treating a carbon-supplying layer so that a surface of the carbon-supplying layer is modified
Implementation Method 2
performing Joule heating under a specific condition to obtain a carbon-metal catalyst composite layer
Data Source
AI summary
A method of manufacturing a composite anode for a lithium ion battery and a composite anode for a lithium ion battery manufactured thereby. According to the method provide herein, since a metal catalyst precursor is reduced using Joule heating to obtain a carbon-metal catalyst composite layer, composite anode for a lithium ion battery having a large area in a short period of time can be provided, which is excellent in terms of economic feasibility. Further, since it is possible to manufacture a composite anode for a lithium ion battery with the improved lithium electrodeposition density and reversibility of lithium ions, a composite anode for a lithium ion battery having high capacity and improved life stability can be obtained.