Boron (B) and phosphorus (P) dual-doped carbon microspheres (BPC) were successfully synthesized from onium salts by a facile one-step pyrolysis method. When employed as the anode material for sodium (Na)-ion batteries (NIBs), the resulting BPC delivers a reversible capacity of 221.9 mAh g⁻¹ at 50 mA g⁻¹. Impressively, the BPC can still deliver a capacity of 102 mAh g⁻¹ after 1500 cycles at 1 A g⁻¹ with the capacity retention up to 78%. The high performance of the BPC can be attributed to the significantly increased defects and dilated interlayer distance induced by synergistically B and P co-doping.

中文翻译：

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鎓盐衍生的B和P双掺杂碳微球作为高性能钠离子电池的负极材料

采用简便的一步法热解法成功地从鎓盐中合成了硼（B）和磷（P）双掺杂碳微球（BPC）。当作为阳极材料为钠（Na） -离子电池（钞）中使用，所得到的BPC提供的221.9毫安g的可逆容量^{- 1}在50mA克^{- 1}。令人印象深刻的BPC仍可递送的102毫安g的容量^{- 1} 1 A G后1500个循环^{- 1}与容量保持高达78％。BPC的高性能可归因于B和P协同掺杂共同引起的缺陷显着增加和层间距离增大。