Non-Aqueous Alkali Metal Cell Doping to Reduce Micro Short Circuits
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Solution Overview
Problem
Current non-aqueous alkali metal electricity storage elements face challenges in achieving high input/output characteristics, durability at elevated temperatures, and preventing micro short circuits, particularly during high load charge/discharge cycles.
Innovation Solution
A method involving pressurization and heating of the cell before or during the doping step, controlled voltage and current application, and efficient doping of negative electrodes with alkali metal ions, along with the use of a non-aqueous electrolytic solution injected under atmospheric pressure, to enhance the decomposition of alkali metal compounds and reduce micro short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high load charge/discharge cycles are performed at elevated temperatures, then output characteristics are improved, but micro short circuits occur and durability deteriorates
Solution Approach 1:
The patent applies preliminary heating to the electricity storage element before high load charge/discharge cycles at elevated temperatures. This pre-heating treatment stabilizes the internal structure and prevents micro short circuits that would otherwise occur during subsequent high-temperature operation, thereby maintaining both output characteristics and durability.
2Productivity
If alkali metal compounds are used in positive electrode precursor, then production efficiency is improved, but micro short circuits occur during decomposition
Solution Approach 1:
The patent applies preliminary heating to decompose alkali metal compounds in the positive electrode precursor before assembly or during initial charging. This controlled decomposition prevents micro short circuits while maintaining production efficiency by eliminating harmful residues that would cause defects.
Solution Approach 2:
The patent controls temperature parameters during heating to optimize the decomposition of alkali metal compounds. By adjusting heating temperature and duration, the patent achieves complete decomposition without causing micro short circuits, thus resolving the contradiction between production efficiency and reliability.
3Productivity
If non-aqueous electrolytic solution is injected under atmospheric pressure, then solution injection efficiency is improved, but gas generation occurs during decomposition
Solution Approach 1:
The patent extracts or removes gas generated during decomposition through venting mechanisms or by performing decomposition under controlled atmospheric conditions. This allows efficient solution injection under atmospheric pressure while preventing gas accumulation that would cause safety issues or reduce productivity.
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 non-aqueous alkali metal electricity storage elements with improved input/output characteristics, elevated temperature durability, and reduced micro short circuit rates, thereby enhancing production efficiency and safety.
Implementation Method 1
a non-aqueous electrolytic solution comprising a lithium salt
Implementation Method 2
the positive electrode active material oxidatively decomposes to release the alkali metal ions
Implementation Method 3
the negative electrode active material intercalates the alkali metal ions
Implementation Method 4
a heating step of heating the non-aqueous alkali metal electricity storage element precursor
Implementation Method 5
a pressurization step of pressurizing the non-aqueous alkali metal electricity storage element precursor from outside
Data Source
AI summary
Provided herein is a method for producing a non-aqueous alkali metal electricity storage element, comprising a voltage application step of applying a voltage to a non-aqueous alkali metal electricity storage element precursor comprising a positive electrode precursor, a negative electrode, a separator, and a non-aqueous electrolytic solution, housed in a casing, wherein a positive electrode active material layer of the positive electrode precursor comprises a positive electrode active material and an alkali metal compound other than the positive electrode active material.