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锂离子电池负极材料磷化锰的制备及其电化学性能
  • 期刊名称:南开大学学报(自然科学版)
  • 时间:0
  • 页码:78-82
  • 语言:中文
  • 分类:O646[理学—物理化学;理学—化学]
  • 作者机构:[1]南开大学新能源材料化学研究所,天津300071
  • 相关基金:国家自然科学基金(20873072); 教育部“长江学者和创新团队发展计划”(IRT0927)
  • 相关项目:锂离子电池"三明治"型非晶态Si基薄膜电极的研究
中文摘要:

采用高能球磨与高温固相合成相结合的方法制备了锂离子电池负极材料磷化锰.X射线衍射(XRD)结果表明,不同投料比的球磨结果相同,没有任何合金相生成.球磨后的混合物焙烧后,当投料时磷含量达到40%(Mn:P=1.5:1)以上时,焙烧后所生成的相基本相同,均为MnP和Mn_2P相.恒流充放电结果显示,当Mn/P投料摩尔比为1:1时,焙烧后的材料具有较好的电化学性能.其首周放电容量为703.1 mAh/g,平台在0.18 V附近,首周充电容量为512.9 mAh/g,20周后容量衰减为152.4 mAh/g.

英文摘要:

Manganese phosphide anode materials were prepared by a convenient high-energy ball-milling technique followed by a high-temperature solid-phase synthesis process.X-ray diffraction(XRD) results showed that no phosphides were formed after ball-milling the mixtures of Mn and P powders with different molar ratios.When the phosphorus content reached over 40%(Mn:P= 1.5:1),the obtained manganese phosphide powders after sintering for each mixture with different Mn/P ratios were composed of MnP and Mn_2P phases.Galvanostatic charge-discharge test results indicated that the manganese phosphide obtained at Mn:P= 1:1 had the best electrochemical performance.Its initial discharge and charge capacity reached 703.1 mAh/g and 512.9 mAh/g,respectively.The discharge plateau was close to 0.18 V.After 20 cycles,the discharge capacity was decayed to 152.4 mAh/g.

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