Effective Carbon Pores to Improve the Electrochemical Performance of Phosphorus as an Anode for Sodium Ion Batteries
Effective Carbon Pores to Improve the Electrochemical Performance of Phosphorus as an Anode for Sodium Ion Batteries
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DOI：
10.1021/acsaem.1c02605
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发表时间：
2021-11
影响因子：
6.4
通讯作者：
Y. Komine;K. Urita;Hiroo Notohara;I. Moriguchi
中科院分区：
文献类型：
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作者：
Y. Komine;K. Urita;Hiroo Notohara;I. Moriguchi
本文提出碳孔是磷钠离子电池中稳定电化学反应的关键反应位点。磷由于与钠离子的三电子反应而表现出较高的理论容量（2596 mA h/g），是一种显著的sib负极材料。但由于磷的电导率低，且在充放电过程中体积变化大导致容量衰减，导致反应效率较低。在较大的介孔或大孔碳中引入的磷在首次充电过程中表现出2445 mA h/g的高容量，而在微孔或小介孔碳中引入的磷容量不超过1100 mA h/g，循环性也较差。这一结果清楚地表明，孔径接近或大于50 nm的碳孔是稳定磷与钠离子合金化-脱合金反应的有效反应空间。
We propose here that carbon pores provide key reaction sites for stable electrochemical reactions in phosphorus sodium ion batteries (SIBs). Phosphorus showing a high theoretical capacity (2596 mA h/g) due to a three-electron reaction with sodium ions is a remarkable negative material for SIBs. However, both low electrical conductivity of phosphorus and the capacity fading due to a large volume change during the charge–discharge process lead to a low reaction efficiency. The phosphorus introduced into relatively large mesoporous or macroporous carbons showed a high capacity of 2445 mA h/g at the first charge process, whereas capacities are no more than 1100 mA h/g in microporous or small mesoporous carbons in which the cyclability is also poor. This result clearly indicates that the carbon pores with a pore size close to or above 50 nm are effective reaction spaces for stabilization of the alloying–dealloying reaction of phosphorus with sodium ions.