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(Fe0.5Ni0.5)0.96S with Bimetallic Cation Vacancy Defect as an Efficient Catalyst for Regulating the Reaction Kinetics of Li2S
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-11-26 , DOI: 10.1021/acsaem.3c02117
Hongling Guo 1 , Haixia Kuang 1 , Jihui Zhang 1 , Weiliang Liu 1 , Jinshui Yao 1 , Mei Li 1 , Jiaxi Cui 2 , Yuanhao Wang 3 , Manman Ren 1
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-11-26 , DOI: 10.1021/acsaem.3c02117
Hongling Guo 1 , Haixia Kuang 1 , Jihui Zhang 1 , Weiliang Liu 1 , Jinshui Yao 1 , Mei Li 1 , Jiaxi Cui 2 , Yuanhao Wang 3 , Manman Ren 1
Affiliation
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Recently, defect-engineered modified materials with abundant active sites are considered promising hosts of sulfur cathodes in lithium sulfur batteries (LSBs). Here, a multifunctional (Fe0.5Ni0.5)0.96S-reduced graphene oxide composite (NFS-rGO) has been fabricated by the combination of highly conductive rGO and bimetallic cation vacancy structure and was utilized as a sulfur host. The bimetallic cation vacancies provide plentiful active sites for the adsorption and accelerated conversion of lithium polysulfides (LiPSs). The rGO afforded a highly conductive network and inhibited the aggregation of (Fe0.5Ni0.5)0.96S nanoparticle. After sulfur loading, the NFS-rGO/S exhibited satisfactory electrochemical performances, and it presented a high capacity of 729.3 mAh g–1 at 3 C and a lower capacity attenuation rate of 0.066% per cycle during 700 cycles at 1 C. In addition, the galvanostatic intermittent titration technique and Li2S deposition results indicated that the nucleation barrier of Li2S is effectively reduced, and the polarization is also alleviated. This work provided a simple preparation technique for the fabrication of bimetallic cation vacancy materials and offered a foundation for application of such materials in LSBs.
中文翻译：
具有双金属阳离子空位缺陷的 (Fe0.5Ni0.5)0.96S 作为调节 Li2S 反应动力学的有效催化剂
最近，具有丰富活性位点的缺陷工程改性材料被认为是锂硫电池（LSB）中硫正极的有前途的主体。这里，通过结合高导电性rGO，制备了多功能（Fe 0.5 Ni 0.5 ） 0.96 S-还原氧化石墨烯复合材料（NFS-rGO）和双金属阳离子空位结构并被用作硫主体。双金属阳离子空位为多硫化锂（LiPS）的吸附和加速转化提供了充足的活性位点。 rGO提供了高导电网络并抑制了(Fe 0.5 Ni 0.5 ) 0.96 S纳米颗粒的聚集。负载硫后，NFS-rGO/S表现出令人满意的电化学性能，在3 C下表现出729.3 mAh g –1 的高容量，在700次循环中，每循环的容量衰减率较低，为0.066%。 1 C.此外，恒电流间歇滴定技术和Li 2 S沉积结果表明，Li 2 S的成核势垒得到有效降低，极化也得到缓解。该工作为双金属阳离子空位材料的制备提供了一种简单的制备技术，并为此类材料在LSB中的应用奠定了基础。
更新日期：2023-11-26
中文翻译：
具有双金属阳离子空位缺陷的 (Fe0.5Ni0.5)0.96S 作为调节 Li2S 反应动力学的有效催化剂
最近，具有丰富活性位点的缺陷工程改性材料被认为是锂硫电池（LSB）中硫正极的有前途的主体。这里，通过结合高导电性rGO，制备了多功能（Fe 0.5 Ni 0.5 ） 0.96 S-还原氧化石墨烯复合材料（NFS-rGO）和双金属阳离子空位结构并被用作硫主体。双金属阳离子空位为多硫化锂（LiPS）的吸附和加速转化提供了充足的活性位点。 rGO提供了高导电网络并抑制了(Fe 0.5 Ni 0.5 ) 0.96 S纳米颗粒的聚集。负载硫后，NFS-rGO/S表现出令人满意的电化学性能，在3 C下表现出729.3 mAh g –1 的高容量，在700次循环中，每循环的容量衰减率较低，为0.066%。 1 C.此外，恒电流间歇滴定技术和Li 2 S沉积结果表明，Li 2 S的成核势垒得到有效降低，极化也得到缓解。该工作为双金属阳离子空位材料的制备提供了一种简单的制备技术，并为此类材料在LSB中的应用奠定了基础。
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