Rechargeable Manganese Dioxide||Hard Carbon Lithium Batteries in an Ether Electrolyte
Rechargeable Manganese Dioxide||Hard Carbon Lithium Batteries in an Ether Electrolyte
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DOI：
10.1149/1945-7111/ad3415
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发表时间：
2024-03-31
影响因子：
3.9
通讯作者：
Lin，Feng
中科院分区：
文献类型：
--
作者：
Xia，Dawei;Rosenberg，Keith;Lin，Feng
地球资源丰富、具有成本效益的电极材料对于可持续充电电池和全球脱碳至关重要。二氧化锰（MnO 2）和硬碳都具有很高的结构和化学可调性，使它们成为电池的优良电极候选物。在此，我们阐明了在锂化学中电解质对商业电解二氧化锰的循环性能的影响。我们利用同步加速器X射线分析来辨别循环期间Mn的化学状态和局部结构特征，以及量化对电极上的Mn沉积。通过使用基于醚的电解质，而不是传统的碳酸盐电解质，我们规避形成的表面Mn（II）层和Mn溶解从Li x MnO 2。因此，我们实现了一个令人印象深刻的100%的容量保持MnO 2在300个循环后，在C/3。为了制造贫锂金属的全电池，我们引入了硬碳作为阳极，它与基于醚的电解质兼容。商用硬碳在0.1 A g− 1时的比容量为1230 mAh g− 1，没有平台，表明表面吸附机制。生成的二氧化锰||硬碳全电池表现出稳定的循环和高库仑效率。我们的研究提供了一个有前途的解决方案，使用广泛可用的氧化锰和硬碳材料开发具有成本效益，可扩展和安全的储能解决方案。
Earth-abundant, cost-effective electrode materials are essential for sustainable rechargeable batteries and global decarbonization. Manganese dioxide (MnO 2) and hard carbon both exhibit high structural and chemical tunability, making them excellent electrode candidates for batteries. Herein, we elucidate the impact of electrolytes on the cycling performance of commercial electrolytic manganese dioxide in Li chemistry. We leverage synchrotron X-ray analysis to discern the chemical state and local structural characteristics of Mn during cycling, as well as to quantify the Mn deposition on the counter electrode. By using an ether-based electrolyte instead of conventional carbonate electrolytes, we circumvent the formation of a surface Mn (II)-layer and Mn dissolution from Li x MnO 2. Consequently, we achieved an impressive∼ 100% capacity retention for MnO 2 after 300 cycles at C/3. To create a lithium metal-lean full cell, we introduce hard carbon as the anode which is compatible with ether-based electrolytes. Commercial hard carbon delivers a specific capacity of∼ 230 mAh g− 1 at 0.1 A g− 1 without plateau, indicating a surface-adsorption mechanism. The resulting manganese dioxide|| hard carbon full cell exhibits stable cycling and high Coulombic efficiency. Our research provides a promising solution to develop cost-effective, scalable, and safe energy storage solutions using widely available manganese oxide and hard carbon materials.