Lithium-Ion Battery Peroxide Ion Stabilization
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Solution Overview
Problem
Lithium-ion batteries with a positive electrode containing lithium oxide having a layered rock-salt structure struggle to stably provide high capacity due to insufficient cycle durability and capacity retention.
Innovation Solution
Incorporating peroxide ions (O22−) in the positive electrode, generated through an oxidation treatment involving low-temperature charge/discharge cycles followed by elevated temperature charging, to enhance the stability and capacity of the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If charge/discharge pre-treatment is performed with controlled charging capacity, then cycle durability is improved and high capacity is provided, but the effect is still insufficient for achieving stable high capacity
Solution Approach 1:
The patent changes the oxidation treatment parameters by performing charge/discharge cycles at elevated temperatures (40-60°C) and controlling the potential range to not exceed 4.6V. This temperature and potential parameter combination enables effective peroxide ion generation while maintaining structural stability, resolving the insufficient capacity stability issue of conventional room-temperature oxidation treatments
Solution Approach 2:
The patent employs strong oxidation conditions by repeating charge/discharge cycles at elevated temperatures within a controlled potential range, which generates peroxide ions (O2 2-) in the lithium oxide positive electrode material. This accelerated oxidation process through thermal activation achieves better capacity stability compared to conventional mild oxidation treatments
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 method effectively stabilizes the lithium-ion battery's capacity, providing higher and more consistent performance compared to batteries without peroxide ions, as confirmed by Raman spectra and X-ray photoelectron spectroscopy.
Implementation Method 1
an oxidation treatment in which a charge/discharge is performed at a temperature of 10° C. or less, and then a charge/discharge is performed at an elevated temperature
Data Source
AI summary
The present invention relates to a lithium-ion battery. The lithium-ion battery comprises a positive electrode containing, as a principal component, a lithium oxide having a layered rock-salt structure and represented by chemical formula: LixM1yM2zO2-d. In this chemical formula, 1.16≦x≦1.32, 0.33≦y≦0.63, 0.06≦z≦0.50, M1 represents a metal ion selected from Mn, Ti and Zr, or a mixture thereof, and M2 represents a metal ion selected from Fe, Co, Ni and Mn, or a mixture thereof. The lithium-ion battery also comprises a negative electrode containing, as a principal component, a material capable of intercalating/deintercalating lithium ions, wherein peroxide ion(s) (O22−) are contained in the positive electrode.