对于离子电池应用中的新型Wadsley Roth Nb7Ti1.5Mo1.5O25和Ta7Ti1.5Mo1.5O25阳极的结构和电化学见解
A J Green1, E H Driscoll2, Y Lakhdar2
1School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK. p.r.slater@bham.ac.uk.
Dalton transactions (Cambridge, England : 2003)
|September 7, 2023
概括
研究人员开发了一种新的--氧化物阳极,用于高功率的离子电池. 虽然显示出良好的稳定性和高速率性能,可降解单位导致初始容量损失.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 储能 储能 储能 储能 储能 储能
背景情况:
- 基于的阳极由于容量,安全性和稳定性,对高功率的离子电池充满希望.
- 瓦兹利·罗斯酸盐结构以其在电池应用中的潜力而闻名.
研究的目的:
- 发现和描述一种新的Wadsley Roth酸盐系统,Nb7Ti1.5Mo1.5O25,用于离子电池阳极.
- 为了评估其电化学性能,特别是在高电流密度和长期稳定性.
- 为了研究可降解子在这些酸盐系统的电化学行为中的作用.
主要方法:
- 一个新的沃兹利·罗斯酸盐相 (Nb7Ti1.5Mo1.5O25) 的合成和表征.
- 使用半硬币电池进行电化学性能测试,包括初始容量,高电流密度率和循环稳定性.
- 合成和电化学评估一个类似物 (Ta7Ti1.5Mo1.5O25),以了解氧化还原对.
- 探索Nb-Ti-Mo氧化物系统中的组成变化.
主要成果:
- 新的Nb7Ti1.5Mo1.5O25阶段的初始容量为268(9) mA hg-1在0.01 A g-1.1时.
- 观察到最初不可逆转的容量损失,归因于可可还原MoO4单位的捕获.
- 该材料表现出良好的高速率性能 (132(10) mA hg-1在2A g-1时,115(14) mA hg-1在4A g-1时) 和容量保留 (97%在100个循环后在0.2A g-1时).
- 的类型显示出较低的初始容量,但具有类似的容量保留.
- 单相Nb10-2xTixMoxO25样本准备用于1.5 ≤ x ≤ 1.75.
结论:
- 两种新的Wadsley Roth相被成功合成并通过电化学表征.
- 该Nb-Ti-Mo酸盐系统显示出高功率离子电池的潜力,尽管最初不可逆转的容量损失带来了挑战.
- 在四面体位点中存在可还原的存在,对最小化这些结构中的容量损失构成了关键挑战.
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