基于Ti3C2/CoS2复合负极的具有优异倍率性能和循环稳定性的高度可逆锂离子电池,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

基于Ti3C2/CoS2复合负极的具有优异倍率性能和循环稳定性的高度可逆锂离子电池
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-09-12 , DOI: 10.1021/acsami.3c09605
Shuhao Tian ₁ , Di Wang ₁ , Zhe Liu ₁ , Guo Liu ₂ , Qi Zeng ₁ , Xiao Sun ₁ , Hongcen Yang ₁ , Cong Han ₁ , Kun Tao ₂ , Shanglong Peng ₁

Affiliation

过渡金属硫化物(TMS) CoS ₂因其高比容量、高电化学活性和低成本而被认为是新一代锂离子电池(LIB)的理想负极材料。然而，CoS ₂在参与电池内部转化反应时容易发生体积膨胀和结构塌陷，限制了其实际应用。_{在分析了CoS 2}作为LIBs负极材料的失效机理后，引入了纳米工程材料的概念。CoS ₂颗粒是纳米级的并且通过在碱处理的二维Ti ₃ C ₂ Mxene导电网络上构造复合结构来稳定化。_{实验和理论计算均表明，Ti 3} C ₂ /CoS ₂复合材料的界面上通过含氧官能团形成了特殊的Ti-O-Co键。具有可调节电子特性的Ti-O-Co键合可以有效提高负极材料的利用率、电子电导率和离子扩散率，从而增强器件的氧化还原反应动力学。当Ti ₃ C ₂ /CoS ₂复合材料用作锂离子电池负极材料时，在0.1 A g ^{–1下循环100次后仍具有405.8 mAh g}^–1的高比容量。^{在1 A g –1}的大电流下运行1000次循环后，容量保持率仍接近100%。^{此外，在高活性材料负载量（10.58 mg cm –2}）和低电解质/活性材料比（10 μL mg ^–1 ）条件下实现了高循环稳定性。这项工作为商业化锂离子电池负极材料的开发提供了新思路。

"点击查看英文标题和摘要"

Highly Reversible Lithium-Ion Battery with Excellent Rate Performance and Cycle Stability Based on a Ti3C2/CoS2 Composite Anode

Transition metal sulfide (TMS) CoS₂ is considered an ideal anode material for new-generation lithium-ion batteries (LIBs) because of its high specific capacity, high electrochemical activity, and low cost. However, CoS₂ is prone to volume expansion and structural collapse when it participates in the internal conversion reaction of the battery, which limits its practical application. After analyzing the failure mechanism of CoS₂ as the anode material of LIBs, the concept of nanoengineered materials is introduced here. CoS₂ particles are nanosized and stabilized by constructing a composite structure on an alkali-treated two-dimensional Ti₃C₂ Mxene conductive network. Both experiments and theoretical calculations show that special Ti–O–Co bonds are formed at the interface of the Ti₃C₂/CoS₂ composite through oxygen-containing functional groups. Ti–O–Co bonding with adjustable electronic characteristics can effectively promote the utilization rate of anode materials, electronic conductivity, and ionic diffusivity and thus enhance the redox reaction kinetics of the device. When the Ti₃C₂/CoS₂ composite is used as the anode material for LIBs, it still provides a high specific capacity of 405.8 mAh g^–1 after 100 cycles at 0.1 A g^–1. After running for 1000 cycles at a high current of 1 A g^–1, the capacity retention is still close to 100%. Also, high cycle stability under the condition of highly active material loading (10.58 mg cm^–2) and low electrolyte/active material ratio (10 μL mg^–1) is achieved. This work provides a new idea for the development of commercial LIBs as anode materials.

更新日期：2023-09-12

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南