| 陈海辉,邱新平.尖晶石锰酸锂电池容量衰减的机理探析[J].井冈山大学自然版,2015,(4):34-42,74 |
| 尖晶石锰酸锂电池容量衰减的机理探析 |
| MECHANISM ANALYSIS ON CAPACITY FADING OF SPINEL LITHIUM MANGANESE OXIDE CELL |
| 投稿时间：2015-01-06 修订日期：2015-03-07 |
| DOI：10.3969/j.issn.1674-8085.2015.04.007 |
| 中文关键词: 容量衰减 锰沉积 锰酸锂 锂离子电池 |
| 英文关键词: capacity fade manganese deposition lithium manganese oxide lithium-ion batteries |
| 基金项目:江西省科技支撑计划项目(20122BBE500047、20123BBG70204);江西省教育厅科技计划项目(KJLD12080,2013年度访学项目) |
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| 中文摘要: |
| 尖晶石型锰酸锂的容量衰减是限制其大规模应用的瓶颈问题。现有观点认为二价锰离子在阳极上还原成金属锰,催化电解质分解、毒化固体电解质界面(SEI)膜,造成了锰酸锂体系锂离子电池的容量衰减。但最新研究确定锰元素是以二价的锰沉积在阳极上,并没有被还原成金属锰。本研究介绍国内外锰系锂离子电池容量衰减的研究进展,并在“沉积阳极上的锰氧化态是+2价”这个新发现的基础上,结合分析其它文献的实验数据,归纳总结出 “二价锰离子与阳极SEI膜中的活性锂离子进行离子交换而沉积在阳极上,阻碍、堵塞活性锂离子的自由进出,从而引起锂离子电池容量衰退”新观点。 |
| 英文摘要: |
| The capacity fade of spinel lithium manganese oxide cell is a bottleneck challenge for its large-scale application. It is traditionally thought that Mn(II) ions at the anode is reduced to the metallic manganese that helps for catalyzing electrolyte decomposition. This could poison and damage the solid electrolyte interface (SEI) film leading to the capacity fade in Li-ion batteries. But the latest research has identified that the manganese deposited on the anode is +2 valent, and is not reduced to the metallic manganese. Research progresses of capacity fade of manganese lithium ion batteries in the world were introduced in this paper, based on the new discovery “manganese deposited on anode is +2 valent” and the results obtained from the literature, a new mechanism has been purposed that Mn(II) is exchanged with active Li-ion in anode SEI film, then deposited at the anode, which hinders and/or blocks the intercalation/de-intercalation of lithium ions, then leads to the capacity fade in Li-ion batteries. |
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