石榴石电解质上CO2和H2O的动态演变,通过环境压力X射线光谱仪阐明
Nian Zhang1,2, Guoxi Ren2, Lili Li3
1Shanghai Synchrotron Radiation Facility, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, 201204, China.
Nature communications
|March 30, 2024
概括
石榴石类型的兰氧化 (LLZO) 固体电解质在空气中降解. 在现场的X射线光谱显示,CO2形成了一个自我限制的Li2CO3层,而H2O在更高的压力下加剧了降解.
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
- 表面科学是一门学科.
背景情况:
- 石榴石型Li6.5La3Zr1.5Ta0.5O12 (LLZO) 是所有固态电池的一个有前途的固体电解质.
- 在环境空气中LLZO的表面降解限制了其实际应用.
- 缺乏现场表征方法阻碍了对LLZO表面反应的理解.
研究的目的:
- 在不同的气体环境中使用现场技术研究LLZO表面的动态演变.
- 为了确定在LLZO表面退化过程中形成的特定含物种.
- 阐明LLZO空气稳定的机制和初始表面层的作用.
主要方法:
- 环境压力X射线光谱仪被用于现场分析.
- 发明并使用了共振奥格尔光谱的环境压力映射.
- 在各种气体环境 (例如,CO2,H2O) 中研究了LLZO表面演变.
主要成果:
- 环境压力共振的奥格尔光谱学成功地区分了各种物种 (LiOH,Li2O,Li2CO3) 和晶格氧.
- 二氧化碳与LLZO的反应形成了一个热力学上有利的,自我限制的Li2CO3层.
- 与LLZO的H2O反应较慢,但随着压力增加,Li+/H+交换被光谱学证实.
结论:
- 这项研究揭示了二氧化碳和H2O在LLZO表面的不同反应路径.
- 最初的表面层在确定LLZO电解质的空气稳定性方面发挥着关键作用.
- 在现场开发的技术为研究能源材料降解机制提供了新的方法.
相关概念视频
Volatilization
385
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
385
Atomic Absorption Spectroscopy: Atomization Methods
421
Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
421
Atomic Spectroscopy: Effects of Temperature
330
Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...
330
Constant Pressure Calorimetry
85.2K
Calorimetry is a technique used to measure the amount of heat involved in a chemical or physical process or to measure the heat transferred to or from a substance. The heat is exchanged with a calibrated and insulated device called the calorimeter. Calorimetry experiments are based on the assumption that there is no heat exchange between the insulated calorimeter and the external environment. The well-insulated calorimeters prevent the transfer of heat between the calorimeter and its external...
85.2K
Energetics of Solution Formation
6.7K
The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Formation of the solution requires the solute–solute and solvent–solvent...
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Formation of the solution requires the solute–solute and solvent–solvent...
6.7K
Gravimetry: Inorganic And Organic Precipitating Agents
1.3K
In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...
1.3K


