Sulfur‐Implanted Carbon Dots‐Embedded Graphene as Ultrastable Anode for Li‐Ion Batteries,Energy Technology

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Sulfur‐Implanted Carbon Dots‐Embedded Graphene as Ultrastable Anode for Li‐Ion Batteries
Energy Technology ( IF 3.6 ) Pub Date : 2020-12-23 , DOI: 10.1002/ente.202000899
Ramesh Gottam ₁ , Xiangxin Zhang _{1,

2} , Jiang Chen ₃ , Xilai Xue _{1,

3} , Yining Zhang _{1,

2,

3,

4}

Affiliation

Sulfur doping in carbonaceous materials is an effective approach to improve the performance of Li‐ion batteries (LIBs). Herein, sulfur‐implanted carbon dots‐embedded graphene (S‐CDs/rGO) as an anode material for LIBs is reported. A facile method is used to prepare S‐CDs/rGO by annealing the mixture of benzyl disulfide (BDS) and graphene oxide (GO). Herein, BDS serves as both the sulfur source and precursor of CDs. S‐CDs/rGO as an anode material for LIB delivers initial specific capacities of 938.8 mAh g⁻¹ (first cycle) and 598.6 mAh g⁻¹ (second cycle) at a current density of 100 mA g⁻¹. S‐CDs/rGO exhibits superior cycling performance with good capacity retentions of 78.8% (500 cycles), 61.5% (2000 cycles), and 75.7% (2000 cycles) at higher current densities of 1000, 2000, and 3000 mA g⁻¹, respectively. Moreover, the full cell assembly of the prepared S‐CDs/rGO as an anode and commercial LiFePO₄ as a cathode in the voltage range of 1.5–3.9 V delivers a high reversible capacity of 203.3 mAh g⁻¹ after extensive 1000 cycles at 500 mA g⁻¹ with 51.8% retention (a low fading rate of 0.049% per cycle), rendering it as a promising anode material for application in high‐performance LIBs.

中文翻译：

硫植入碳点嵌入石墨烯作为锂离子电池的超稳定阳极

碳质材料中的硫掺杂是提高锂离子电池（LIB）性能的有效方法。本文报道了硫注入的碳点嵌入石墨烯（S-CDs / rGO）作为LIB的阳极材料。一种简便的方法是通过对二硫化苄基（BDS）和氧化石墨烯（GO）的混合物进行退火来制备S-CD / rGO。在此，BDS既是CD的硫源又是其前体。S-CDs / rGO作为LIB的负极材料，在100 mA g ^-1的电流密度下可提供938.8 mAh g ^-1（第一个周期）和598.6 mAh g ^-1（第二个周期）的初始比容量。S‐CD / rGO具有出色的循环性能，在1000、2000和3000 mA g ^-1的更高电流密度下，具有良好的容量保持率，分别为78.8％（500个循环），61.5％（2000个循环）和75.7％（2000个循环）。，分别。此外，准备好的S-CDs / rGO的全电池组件在1.5-3.9 V的电压范围内作为阳极，商用LiFePO ₄作为阴极，在500次广泛的1000次循环后可提供203.3 mAh g ^-1的高可逆容量。mA g ^-1保留51.8％（每周期0.049％的低衰减率），使其成为高性能LIB的有希望的阳极材料。

更新日期：2021-02-05

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