Core-Shell Dry Electrode Film for High-Temperature Cycling Stability
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Solution Overview
Problem
Lithium batteries face challenges in achieving high energy density and miniaturization while maintaining high-temperature cycling performance due to the use of solvents in electrode manufacturing, which can lead to side reactions and reduced battery capacity.
Innovation Solution
A dry electrode film with a core-shell structure incorporating elements from Period 2 of the Periodic Table, such as beryllium (Be), boron (B), and fluorine (F), is developed, which reduces side reactions and improves high-temperature cycling performance by inhibiting electrolyte interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a slurry containing solvent is used to manufacture the electrode, then the electrode manufacturing process is easier, but a large quantity of solvent is consumed and side reactions occur reducing battery capacity
Solution Approach 1:
The patent removes the solvent component from the electrode manufacturing slurry, transitioning from a wet process to a dry process. The electrode active material is applied directly to the current collector without solvent, eliminating solvent consumption and the harmful side reactions that occur during drying and storage.
Solution Approach 2:
The patent changes the physical state parameter of the electrode manufacturing process from wet (slurry form) to dry (powder form). This parameter change eliminates the need for solvent removal through drying and prevents solvent-related side reactions, while maintaining electrode manufacturing feasibility through direct compression and sintering processes.
2Device complexity
If conventional electrodes are used, then manufacturing is simpler, but high-temperature cycling performance deteriorates due to side reactions
Solution Approach 1:
The patent introduces a protective coating layer as an intermediary between the electrode active material and the electrolyte. This coating prevents direct contact and harmful side reactions at high temperatures, improving cycling performance while adding minimal structural complexity.
Solution Approach 2:
The patent uses composite electrode structures combining multiple materials with complementary properties. The electrode consists of active material particles embedded in a binder matrix, with optional protective coatings, creating a composite structure that enhances thermal stability and cycling performance.
3Volume of moving object
If energy density is increased for miniaturization, then device size is reduced, but heat management becomes more difficult at elevated temperatures
Solution Approach 1:
The patent employs porous electrode structures and porous separators that provide thermal pathways for heat dissipation. The porous architecture increases surface area for heat exchange while maintaining high energy density through efficient space utilization, enabling better thermal management in compact batteries.
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 dry electrode film enhances lithium battery performance by preventing side reactions and maintaining high energy density and stability at elevated temperatures, with optimal elemental content between 1 wt% to 4 wt% as determined by XPS analysis.
Implementation Method 1
the shell includes an element of Period 2 of the Periodic Table of the Elements of (e.g., at least one element selected from among) beryllium (Be), boron (B), and/or fluorine (F)... improves high-temperature cycling performance by including a dry electrode active material containing an element of Period 2
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A dry electrode film, and a dry electrode and a lithium battery that include the same are provided. The dry electrode film includes a dry electrode active material and a dry binder, wherein the dry electrode active material includes a core and a shell conforming to a surface of the core, the shell includes at least one element selected from among beryllium (Be), boron (B), and fluorine (F), and in an X-ray photoelectron spectroscopy (XPS) spectrum of a surface of the dry electrode active material, a content (e.g., amount) of the at least one element of is about 1 wt% to about 4 wt%.