Amorphous Inorganic Binder for Low-Temperature Battery Electrodes
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Solution Overview
Problem
Current lithium ion batteries face challenges in improving discharge capacity at low calcination temperatures, particularly below 600 degrees C, where existing methods often result in insufficient film strength and increased resistance.
Innovation Solution
The use of an amorphous inorganic binder, specifically oxides of bismuth (Bi), zinc (Zn), boron (B), silicon (Si), and vanadium (V), with a weight ratio of 25:75 to 75:25 with the positive electrode active material, calcined at a temperature greater than or equal to the glass transition point but no more than 600 degrees C, enhances the discharge capacity and reduces resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic binders such as PVdF, PTFE, or SBR are used in lithium ion batteries, then the electrode structure is maintained, but the discharge capacity is limited and production costs increase
Solution Approach 1:
The invention changes the chemical composition parameters of the binder from organic materials to specific inorganic compounds (Bi2O3, ZnO, B2O3, SiO2, V2O5 with alkali/alkali earth metals), which fundamentally alters the binding mechanism and enables both structural stability and improved discharge capacity through inorganic-inorganic interfaces
Solution Approach 2:
The invention creates a composite binder system combining multiple inorganic oxides (Bi2O3-ZnO-B2O3, Bi2O3-SiO2-B2O3, ZnO-SiO2-B2O3, etc.) that synergistically provide structural binding while facilitating lithium ion transport, thereby resolving the contradiction between structure maintenance and capacity enhancement
2Productivity
If inorganic binders are used to replace organic binders, then discharge capacity can be improved, but calcination temperature must be increased to 750-1100 degrees C, increasing energy consumption
Solution Approach 1:
The invention changes the calcination temperature parameter from conventional 750-1100 degrees C to a lower range of 600-800 degrees C by optimizing the inorganic binder composition, specifically using eutectic mixtures that melt or become active at lower temperatures, thereby reducing energy consumption while maintaining discharge capacity improvements
Solution Approach 2:
The invention introduces alkali metal oxides (Li2O, Na2O, K2O) and alkali earth metal oxides (CaO, SrO, BaO) as intermediary components that lower the melting points and activation temperatures of the inorganic binder system, enabling effective binding at reduced calcination temperatures and thus reducing energy consumption
3Temperature
If lithium phosphate is used as a sintering auxiliary agent, then sintering can be achieved at 1000 degrees C or less, but the process complexity increases and manufacturing precision is compromised
Solution Approach 1:
The invention changes the sintering temperature parameter to an optimized range of 600-800 degrees C through careful selection of inorganic oxide compositions, achieving complete binder activation and electrode densification at this lower temperature range, thereby simplifying the manufacturing process and improving density uniformity without requiring complex high-temperature control
Solution Approach 2:
The invention applies local quality by ensuring the inorganic binder composition is uniformly distributed at the particle level throughout the electrode precursor, creating localized binding zones that activate at the lower sintering temperature, which prevents overheating and maintains uniform electrode density, thereby improving manufacturing precision
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 improves discharge capacity while maintaining film strength and reducing resistance, thereby enhancing the overall performance and efficiency of lithium ion batteries.
Implementation Method 1
The amorphous inorganic binder (B) is calcinated at a temperature, which temperature is more than or equal to a glass transition point of the amorphous inorganic binder (B) and 600 °C or less
Data Source
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Figure 4
AI summary
A battery is provided including a positive electrode, a negative electrode, and an electrolyte layer between the positive electrode and the negative electrode. At least one of the positive electrode and the negative electrode includes at least one kind of an inorganic binder that includes an oxide of at least one kind of element selected from the group including bismuth (Bi), zinc (Zn), boron (B), silicon (Si) and vanadium (V).