A rechargeable all-solid-state sodium peroxide (Na2O2) battery with low overpotential
A rechargeable all-solid-state sodium peroxide (Na2O2) battery with low overpotential
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DOI：
10.1088/1361-6463/abdc95
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发表时间：
2021-04
期刊：
影响因子：
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通讯作者：
Chenggong Jiang;B. Mao;Fangyuan Diao;Qingtian Li;Z. Wen;P. Si;Hui Zhang;Zhi Liu
中科院分区：
文献类型：
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作者：
Chenggong Jiang;B. Mao;Fangyuan Diao;Qingtian Li;Z. Wen;P. Si;Hui Zhang;Zhi Liu
Na-O2电池由于其固有的高理论能量密度而受到关注。几种Na-O2体系可以产生具有不同电化学性能的放电产物。例如，超氧化钠（NaO 2）电池具有低过电位，而过氧化钠（Na 2 O2）电池具有高容量。由于难以形成纯Na 2 O2放电产物，Na 2 O2电池的研究相对较少。纯Na_2O_2电池系统对于充分探索Na-O_2电池中Na_2O_2的形成和分解以及评估其潜力是非常理想的。Na 2 O2电池的这种模型也应该与原位表征兼容。为此，我们构建了一个简单的可充电全固态Na 2 O2电池。以纳米多孔金膜为阴极，Na-β″-Al 2 O3为固体电解质，组装了一种能产生并分解Na 2 O2的Na-O2电池。全固态Na-O2电池是进行原位常压X射线光电子能谱（APXPS）研究的简单模型。电池可在低过电位（<450 mV）下循环。对APXPS和拉曼光谱的定性和定量分析表明，Na 2 O2是充放电过程中的主要产物，其在充放电过程中发生了转化。对这种全固态Na_2O_2电池的操作性研究有助于全面开发Na-O_2电池的潜力。
Na–O2 batteries have been attracting attention owing to their intrinsically high theoretical energy density. Several Na–O2 systems can produce various discharge products with different electrochemical performances. For example, sodium superoxide (NaO2) batteries have a low overpotential, and sodium peroxide (Na2O2) batteries have a high capacity. Studies of Na2O2 batteries are relatively scarce, owing to the difficulty of forming pure Na2O2 discharge products. A pure Na2O2 battery system is highly desirable for fully exploring the formation and decomposition of Na2O2 in Na–O2 batteries and evaluating their potential. This model of a Na2O2 battery should also be compatible with in situ characterization. To this end, we constructed a simple rechargeable all-solid-state Na2O2 battery. Using a nanoporous gold film as the cathode and Na–β″-Al2O3 as a solid electrolyte, we assembled a Na–O2 battery that can produce and decompose Na2O2. The all-solid-state Na–O2 battery is a simple model for conducting in situ ambient-pressure x-ray photoelectron spectroscopy (APXPS) investigations. The battery can be cycled at a low overpotential (≈450 mV). Qualitative and quantitative analyses of the APXPS and Raman results demonstrated that Na2O2 was the main discharge product and its transformation occurred during the charge and discharge periods. The operando investigation of this type of all-solid-state Na2O2 battery can help in the comprehensive exploration of the potential of Na–O2 batteries.