高振实密度空心 Ni3Se4 作为无碳硫固定剂实现锂硫电池的高容量和重量容量,ACS Applied Materials & Interfaces

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高振实密度空心 Ni3Se4 作为无碳硫固定剂实现锂硫电池的高容量和重量容量
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-05-25 , DOI: 10.1021/acsami.2c01951
Yuan Yao _{1,

2} , Caiyun Chang _{1,

2} , Hao Sun _{2,

3} , Di Guo _{1,

2} , Rongrong Li ₂ , Xiong Pu _{1,

2,

4,

5} , Junyi Zhai _{1,

2,

4}

Affiliation

尽管锂硫电池的实际重量能量密度已经超过了传统的锂离子电池，但由于碳质材料的低密度，体积能量密度仍然相形见绌。在此，设计了具有各种结构的中空极性硒化镍（Ni ₃ Se ₄）并将其用作无碳硫固定剂。_{其中，Ni 3} Se ₄等空心海胆具有高孔隙率（0.39 cm ³ g ^-1）和大比表面积（82.7 m ² g ^-1) 表现出丰富的吸附和电催化位点，保证了锂硫电池具有优异的电化学性能。相应地，Ni ₃ Se ₄基硫电极表现出优异的倍率耐久性（2.0 C 下为 581 mAh g ^-1_复合材料）和优异的循环稳定性（在 1.0 C 下 1000 次循环中每循环 0.042% 的超低褪色率）。更重要的是，由于较高的振实密度（Ni ₃ Se ₄ /S：1.57 g cm ^–3 vs super P/S：0.7 g cm ^–3），Ni ₃ Se ₄基正极的体积比容量同样高为 1699 mAh cm ^{–3 –}_复合材料在 0.1 C，几乎是碳质电极的 2.8 倍。因此，合理的过渡金属硒化物结构设计具有良好的导电性、明确的催化剂和吸附以及高振实密度的协同作用，为实现锂硫电池的高重量和体积能量密度提供了一条有希望的途径。

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Hollow Ni3Se4 with High Tap Density as a Carbon-Free Sulfur Immobilizer to Realize High Volumetric and Gravimetric Capacity for Lithium–Sulfur Batteries

Despite that the practical gravimetric energy density of lithium sulfur batteries has exceeded that of the traditional lithium-ion battery, the volumetric energy density still pales due to the low density of carbonaceous materials. Herein, hollow polar nickel selenide (Ni₃Se₄) with various architectures was designed and employed as a carbon-free sulfur immobilizer. Among them, hollow sea urchins like Ni₃Se₄ with high porosity (0.39 cm³ g^–1) and large specific surface area (82.7 m² g^–1) exhibit abundant adsorptive and electrocatalytic sites, which pledge excellent electrochemical performances of the Li–S battery. Correspondingly, the Ni₃Se₄-based sulfur electrode presents excellent rate endurability (581 mAh g^–1_–composite at 2.0 C) and superior cycle stability (ultralow fading rate of 0.042% per cycle during the 1000 cycles at 1.0 C). More importantly, thanks to the higher tap density (Ni₃Se₄/S: 1.57 g cm^–3 vs super P/S: 0.7 g cm^–3), the volumetric specific capacity of Ni₃Se₄-based cathodes is as high as 1699 mAh cm^–3_–composite at 0.1 C, which is almost 2.8 times that of the carbonaceous electrode. Hence, rational transition metal selenide architecture design with synergistic function of good conductivity, well-defined catalyst and adsorption, as well as high tap density provide a promising route toward high gravimetric and volumetric energy density of Li–S batteries.

更新日期：2022-05-25

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