Lithium Cathode Additive Composition to Reduce Gelation and Gas
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Solution Overview
Problem
Conventional positive electrode additives in lithium secondary batteries cause irreversible capacity loss, gelation, and gas generation due to excessive lithium byproducts, leading to instability and reduced electrochemical performance.
Innovation Solution
A positive electrode additive comprising a lithium metal oxide with controlled Li content, Al doping, and a B-containing oxide coating is introduced to stabilize the electrochemical properties by minimizing Li byproducts and preventing gelation and gas generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional positive electrode additive (e.g., Li2NiO2) including excessive Li is used to satisfy Li consumption of non-carbon-based negative electrode active material, then Li consumption is satisfied, but Li byproduct abnormally increases the viscosity of positive electrode material and causes gelation
Solution Approach 1:
The patent changes the chemical composition parameters of the positive electrode additive by doping Al and B elements into the Li2NiO2 structure. This modifies the material properties to reduce Li byproduct generation while maintaining excessive Li content for satisfying negative electrode Li consumption. The doped structure prevents gelation by controlling the chemical reactivity and stability of the additive.
Solution Approach 2:
The patent creates a composite material structure by incorporating Al and B elements into the Li2NiO2 matrix. This composite approach combines the high Li content capability of Li2NiO2 with the stabilizing effects of Al and B doping, achieving both Li consumption satisfaction and gelation prevention through synergistic material properties.
2Quantity of substance
If a conventional positive electrode additive including excessive Li is used, then Li consumption is satisfied, but Li byproduct causes gas generation during charging/discharging
Solution Approach 1:
The patent modifies the chemical composition parameters by doping Al and B elements into Li2NiO2, which changes the thermal and chemical stability characteristics. This parameter change suppresses the decomposition reactions that generate gas during charging/discharging while preserving the excessive Li content needed for non-carbon-based negative electrodes.
3Quantity of substance
If a conventional positive electrode additive including excessive Li is used, then Li consumption is satisfied, but Li byproduct increases the swelling phenomenon of cell, thereby reducing cycles
Solution Approach 1:
The patent changes the compositional parameters of the additive by incorporating Al and B doping into Li2NiO2. This modification reduces Li byproduct formation and swelling phenomena, thereby improving cycle stability and reliability while maintaining the capability to satisfy Li consumption of high-capacity negative electrodes.
4Object-generated harmful factors
If Al doping and B coating are simultaneously introduced to reduce Li byproduct, then gelation and gas generation are reduced, but the complexity of preparing the positive electrode additive increases
Solution Approach 1:
The patent merges the Al doping step and B coating step into a single integrated preparation process. By combining these two modifications into one additive material (Li2NiO2-doped with Al and B), the patent reduces the number of separate processing steps while achieving both gelation and gas generation reduction simultaneously.
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 additive reduces irreversible capacity loss, gelation, and gas generation, enhancing the stability and performance of lithium secondary batteries.
Implementation Method 1
Al doping
Implementation Method 2
B coating
Implementation Method 3
electrochemical properties
Data Source
AI summary
The present invention relates to a positive electrode additive for a lithium secondary battery and a positive electrode material including the same, and more particularly, to a positive electrode additive for a lithium secondary battery, which enables stable maintenance of the electrochemical properties of a lithium secondary battery by reducing irreversible capacity loss of a negative electrode and reductions in gelation and gas generation, caused by a conventional positive electrode additive, and a positive electrode material including the same.