Lithium-Ion Battery Anode Electric-Field Alignment for Fast Charging
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Solution Overview
Problem
Conventional methods for preparing lithium ion battery anodes fail to achieve high conductivity, energy density, and rate capability simultaneously without increasing production costs.
Innovation Solution
A method involving coating an anode slurry on a current collector and applying point discharge to align conductive agents and active materials within an electric field, followed by drying, to form a conductive structure that enhances conductivity and energy density without increasing raw material costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphene or carbon nanotubes are added to enhance rate capacity and conductivity, then conductivity and rate capability are improved, but production costs increase and active substance proportion decreases
Solution Approach 1:
The patent applies electric field parameter changes during the coating process to orient conductive agents and active materials in a specific direction, enhancing conductivity without adding expensive materials. The electric field strength and direction are controlled to achieve optimal particle arrangement, resolving the contradiction between conductivity improvement and active substance proportion maintenance.
Solution Approach 2:
The patent replaces mechanical mixing methods with an electric field-based orientation system. Instead of relying on random distribution through mechanical mixing, conductive agents and active materials are oriented using electric field forces, achieving superior conductivity with the same material composition, thus maintaining active substance proportion while improving rate capability.
2Reliability
If conventional mixing methods are used to prepare anode slurry, then manufacturing simplicity is maintained, but conductivity and rate capability are insufficient
Solution Approach 1:
The patent applies electric field orientation as a preliminary action during the slurry coating process, before drying and battery assembly. This preliminary orientation of conductive agents and active materials ensures high conductivity is built into the structure from the start, avoiding the need for complex post-processing steps to enhance conductivity.
Solution Approach 2:
The patent introduces controllable electric field parameters (strength, direction, duration) into the coating process. By adjusting these parameters, the orientation degree of conductive particles can be optimized, achieving high conductivity without requiring complex additional processing steps, thus balancing performance improvement with process simplicity.
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 method effectively enhances the conductivity, energy density, and rate capability of lithium ion batteries, allowing for rapid charging efficiency up to 4C without increasing production costs.
Implementation Method 1
performing point discharge on the current collector including the anode slurry layer, to cause the anode active material and the conductive agent to arrange in direction of an electric field
Data Source
AI summary
The present disclosure provides an anode and a preparing method therefor, and a lithium ion battery. The method for preparing an anode includes: coating anode slurry on a surface of a current collector to obtain a current collector including an anode slurry layer, where the anode slurry includes a conductive agent, an anode active material, an adhesive and a solvent; and performing point discharge on the current collector including the anode slurry layer, to cause the anode active material and the conductive agent to arrange in direction of an electric field, and then drying to obtain the anode. By means of the above method, the conductivity, energy density and rate capability of a battery can be enhanced without increasing the cost of raw materials and formulations.