用于离子电池的透调整的分层氧化物阴极
Shu Li1, Lichen Wu1, Hongwei Fu1
1School of Physics and Electronics, Hunan University, Changsha, 410082, P. R. China.
Small methods
|September 15, 2023
概括
基于的阴极材料的度调整通过抑制有害的Mn3+ Jahn-Teller扭曲来提高离子电池 (PIB) 的性能. 这一策略改善了离子动力学和容量保留,用于先进的储能应用.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于的分层氧化物是离子电池 (PIB) 的有希望的阴极材料,因为它们的成本低,容量高.
- 然而,不可逆转的相变和Mn3+ Jahn-Teller扭曲限制了它们的电化学性能,导致它们的动力学和容量减弱.
研究的目的:
- 通过采用调策略来解决 PIB 中基于的阴极的局限性.
- 研究不同成分对K0.45MnxCo(1-x)/4Mg(1-x)/4Cu(1-x)/4Ti(1-x)/4O2.的电化学性质的影响.
主要方法:
- 合成和特征低,中,和高变体的K0.45MnxCo(1-x)/4Mg(1-x)/4Cu(1-x)/4Ti(1-x)/4O2 (x = 0.8,0.6,0.4) 的合成和特征.
- 在PIB中合成的阴极材料的电化学性能评估,包括容量,速率能力和循环稳定性.
- 对Jahn-Teller扭曲的调抑制及其对K+离子传输和体积变化的影响的分析.
主要成果:
- 中等度K0.45Mn0.6Co0.1Mg0.1Cu0.1Ti0.1O2阴极与低度和高度对应物相比,显示出优越的电化学性能.
- 这种中等的材料表现出抑制的Jahn-Teller扭曲,导致增强的K+离子运输和减少体积变化.
- 使用这种阴极的全电池在50 mA g-1下实现了100 mAh g-1的高容量,具有出色的速率能力 (65.8 mAh g-1在500 mA g-1) 和循环稳定性 (350 个循环后67.8 mAh g-1).
结论:
- 透调节是一种有效的策略,可以优化基阴极材料对离子电池的性能.
- 中等构成K0.45Mn0.6Co0.1Mg0.1Cu0.1Ti0.1O2为开发高性能PIB提供了一个有前途的途径.
- 这种方法为设计超越离子电池技术的先进阴极材料提供了新的途径.
相关概念视频
03:00Electrolysis
26.6K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
26.6K
03:06Alkali Metals
19.4K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
Table 1: Properties of the alkali metals
19.4K
03:26Electron Configuration of Multielectron Atoms
42.5K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
42.5K
01:15Potentiometry: Membrane Electrodes
624
Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
624
01:25MOS Capacitor
830
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
830
01:19Ionic Strength: Effects on Chemical Equilibria
1.5K
The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
In this solution, the primary...
1.5K