Secondary Battery Swelling Control via Electrolyte Additives
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Solution Overview
Problem
Current secondary batteries do not adequately address the issue of swelling characteristics, which is a critical performance parameter that requires further improvement.
Innovation Solution
A secondary battery configuration that includes a lithium-nickel composite oxide positive electrode, with specific XPS spectra and intensity ratios, and an electrolytic solution containing boron, sulfur, and fluorine compounds to suppress decomposition reactions and enhance electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic solutions and positive electrode materials are used, then basic battery function is achieved, but swelling characteristic is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the composition ratios of multiple additives in the electrolytic solution. Specifically, it controls the content of cyclic carbonate (15-30 vol%), chain carbonate (70-85 vol%), lithium salt (0.5-2 mol/L), boric acid compound (0.01-0.1 mol/L), and S=O group-containing compound (0.01-0.1 mol/L). This systematic parameter optimization resolves the contradiction by achieving superior swelling characteristics through precise compositional control while maintaining reasonable device complexity.
Solution Approach 2:
The patent employs composite materials by combining multiple additives in the electrolytic solution: cyclic carbonate, chain carbonate, lithium salt, boric acid compound, and S=O group-containing compound. This composite electrolyte formulation works synergistically to improve swelling characteristics. Additionally, the positive electrode uses a composite oxide containing nickel, cobalt, and aluminum in specific ratios, further enhancing battery performance while controlling swelling.
2Use of energy by moving object
If lithium-nickel composite oxide is used as positive electrode active material, then energy density is improved, but decomposition reaction and gas generation occur
Solution Approach 1:
The patent uses the boric acid compound and S=O group-containing compound as intermediaries that form protective films on the positive electrode surface. These intermediary layers prevent direct contact between the lithium-nickel composite oxide and the electrolytic solution, thereby suppressing decomposition reactions and gas generation while allowing the high-energy-density material to function effectively.
Solution Approach 2:
The patent converts the harmful decomposition reactions into beneficial effects by using the decomposition products of the boric acid compound and S=O group-containing compound to form stable protective films on the electrode surface. These films, which initially result from controlled decomposition, actually prevent further harmful decomposition and gas generation, thus converting harm into benefit.
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 proposed configuration achieves a superior swelling characteristic by stabilizing the positive electrode and preventing gas generation during charging and discharging, leading to improved battery performance.
Implementation Method 1
The positive electrode includes a lithium-nickel composite oxide. A first O1s spectrum, a second O1s spectrum, a B1s spectrum, a S2p spectrum, a F1s spectrum, and a Ni3p spectrum are detectable by a surface analysis of the positive electrode by X-ray photoelectron spectroscopy.
Implementation Method 2
A first O1s spectrum, a second O1s spectrum, a B1s spectrum, a S2p spectrum, a F1s spectrum, and a Ni3p spectrum are detectable by a surface analysis of the positive electrode by X-ray photoelectron spectroscopy.
Data Source
AI summary
A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes a lithium-nickel composite oxide. A first O1s spectrum, a second O1s spectrum, a b1s spectrum, a S2p spectrum, a F1s spectrum, and a Ni3p spectrum are detectable by a surface analysis of the positive electrode by X-ray photoelectron spectroscopy. The first O1s spectrum has a peak within a range of binding energy that is greater than or equal to 528 eV and less than or equal to 531 eV. The second O1s spectrum has a peak within a range of binding energy that is greater than 531 eV and less than or equal to 535 eV.