Electrochemical Na Insertion and Solid Electrolyte Interphase for Hard-Carbon Electrodes and Application to Na-Ion Batteries
Electrochemical Na Insertion and Solid Electrolyte Interphase for Hard-Carbon Electrodes and Application to Na-Ion Batteries
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DOI：
10.1002/adfm.201100854
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发表时间：
2011-10-21
影响因子：
19
通讯作者：
Fujiwara, Kazuya
中科院分区：
文献类型：
--
作者：
Komaba, Shinichi;Murata, Wataru;Fujiwara, Kazuya
近年来，锂离子电池在汽车上的应用引起了人们越来越多的兴趣。据证实，锂资源在南美洲分布不均，从1991年首次实际应用到现在，锂原材料的成本大约翻了一番，而且由于全球对锂离子蓄电池的需求，成本还在不断上升。由于钠的电化学当量和标准电位仅次于锂，因此钠基储能对实现无锂高能高压电池具有重要意义。然而，据我们所知，用于电池的电化学钠插入材料还没有成功的报道；主要的挑战是负极及其钝化。在本研究中，我们实现了硬碳和层状NaNi0.5Mn0.5O2电极在碳酸丙烯酯电解液中的高容量和良好的可逆性插钠性能。研究了硬质炭的结构变化和钝化，以研究可逆钠嵌入。具有环保和成本友好性的3伏二次钠离子电池，Na+-羽毛球硬碳/NaNi0.5Mn0.5O2电池，作为下一代二次电池，具有稳定的循环性能，是锂离子电池的替代品。
Recently, lithium-ion batteries have been attracting more interest for use in automotive applications. Lithium resources are confirmed to be unevenly distributed in South America, and the cost of the lithium raw materials has roughly doubled from the first practical application in 1991 to the present and is increasing due to global demand for lithium-ion accumulators. Since the electrochemical equivalent and standard potential of sodium are the most advantageous after lithium, sodium based energy storage is of great interest to realize lithium-free high energy and high voltage batteries. However, to the best of our knowledge, there have been no successful reports on electrochemical sodium insertion materials for battery applications; the major challenge is the negative electrode and its passivation. In this study, we achieve high capacity and excellent reversibility sodium-insertion performance of hard-carbon and layered NaNi0.5Mn0.5O2 electrodes in propylene carbonate electrolyte solutions. The structural change and passivation for hard-carbon are investigated to study the reversible sodium insertion. The 3-volt secondary Na-ion battery possessing environmental and cost friendliness, Na+-shuttlecock hard-carbon/NaNi0.5Mn0.5O2 cell, demonstrates steady cycling performance as next generation secondary batteries and an alternative to Li-ion batteries.