Ageing and Water-Based Processing of LiFeMnPO4 Secondary Agglomerates and Its Effects on Electrochemical Characteristics
Ageing and Water-Based Processing of LiFeMnPO4 Secondary Agglomerates and Its Effects on Electrochemical Characteristics
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DOI：
10.3390/en10122135
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发表时间：
2017-12
期刊：
影响因子：
3.2
通讯作者：
Benjamin Starke;Stefan Seidlmayer;O. Dolotko;R. Gilles;Karl-Heinz Pettinger
中科院分区：
文献类型：
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作者：
Benjamin Starke;Stefan Seidlmayer;O. Dolotko;R. Gilles;Karl-Heinz Pettinger
LiFeMnPO4 二次团聚体已在不同温度和湿度条件下老化。然后将老化的原始粉末样品加工成水基和溶剂基阴极。通过中子和 X 射线衍射进行的结构研究表明，老化和水基加工均未显着改变 LiFeMnPO4 二次团聚体的晶体结构。使用全电池进行电化学表征。发现长期循环是相似的，与用于浆料制备的溶剂无关。与溶剂基阴极相比，由于阴极成分分布更均匀，用水基阴极组装的全电池表现出更好的倍率能力。在任何情况下都没有发现初始活性材料老化对电化学性能有任何负面影响。在老化和加工过程中，LiFeMnPO4 受到碳涂层的有效保护，并且由于其只是可逆结合，因此可以通过干燥完全除去水。这一贡献表明，LiFeMnPO4 二次团聚体可以简化活性材料的处理，并且在可持续水基电极制造方面具有很高的潜力。
LiFeMnPO4 secondary agglomerates have been aged under different temperature and moisture conditions. The aged and pristine powder samples were then processed to water- and solvent-based cathodes. Structural studies by means of neutron and X-ray diffraction revealed that neither ageing nor water-based processing significantly modified the crystal structure of LiFeMnPO4 secondary agglomerates. Electrochemical characterization was carried out with full-cells. It was found that long-term cycling is similar independent of the solvent used for slurry preparation. Full-cells assembled with water-based cathodes show a better C-rate capability due to a more homogeneous distribution of cathode constituents compared to solvent-based ones. In no case was any negative effect of initial active material ageing on the electrochemical performance found. During ageing and processing, LiFeMnPO4 is effectively protected by carbon coating and water can be completely removed by drying since it is only reversibly bound. This contribution shows that LiFeMnPO4 secondary agglomerates allow simplified active material handling and have a high potential for sustainable water-based electrode manufacturing.