锂嵌入型化合物-氢气电池

可充电氢气电池作为一种新兴的电池体系在大规模能源储存领域显示出富有前景的电化学性能. 锂嵌入型化合物作为一大类的锂离子电池正极材料能够很好地用作可充电氢气电池的正极. 本文开发了 2种新型锂嵌入型化合物-氢气电池. 通过使用钴酸锂与磷酸铁锂2种正极材料分别与氢气负极在硫酸锂 水系电解液中进行匹配, 得到了钴酸锂-氢气电池与磷酸铁锂-氢气电池. 钴酸锂-氢气电池展现出约1.27 V 的放电电位, 约97 mA·h·g^-1的比容量及10C的高倍率; 磷酸铁锂-氢气电池展现出约0.66 V的放电电位， 约125 mA·h·g^-1的比容量以及10C的高倍率. 虽然, 钴酸锂-氢气电池和磷酸铁锂-氢气电池因为使用了未经优化的、 不稳定的锂嵌入型化合物正极材料而导致全电池容量衰减, 但这2种电池经过氢气负极的再循环利用均表现出优异的恢复能力. 本文结果证明了氢气电池的化学稳定性及其在未来长寿命电池中具有的大规模能源储存潜力.

Lithium Intercalation Compounds-Hydrogen Gas Batteries

Rechargeable hydrogen gas batteries as a category of emerging battery system show promising electrochemical performance for large-scale energy storage applications. As a large group of cathode materials for lithium-ion batteries， lithium intercalation compounds can be adopted as excellent cathodes for the rechargeable hydrogen gas batteries. In this work， two lithium intercalation compounds-H₂ batteries were studied using LiCoO₂（LCO） and LiFePO₄（LFP） as cathodes in combination with hydrogen gas anode in a Li₂SO₄ aqueous electrolyte， naming LCO-H₂ and LFP-H₂ batteries， respectively. The LCO-H₂ battery shows a high discharge potential of ca. 1.27 V with a capacity of ca. 97 mA·h·g^-1， and a good rate of 10C. In addition， the LFP-H₂ battery shows a discharge potential of ca. 0.66 V with a capacity of ca. 125 mA·h·g^-1， and a good rate of 10C. Although the LCO-H₂ and LFP-H₂ batteries show capacity decay due to the intrinsic instability of the untreated lithium intercalation compound cathodes， both of the two batteries exhibit excellent recoverable capacities by recycling the hydrogen gas anode， demonstrating the robustness of the hydrogen gas battery chemistry for future long lifetime batteries with potentials for grid-scale energy storage.