Mo Doping and Electrochemical Activation Co-Induced Vanadium Composite as High-Rate and Long-Life Anode for Ca-Ion Batteries

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外文摘要：Calcium-ion batteries have been considered attractive candidates for large-scale energy storage applications due to their natural abundance and low redox potential of Ca2+/Ca.However,current calcium ion technology is still hampered by the lack of high-capacity and long-life electrode materials to accommodate the large Ca2+(1.00 Å).Herein,an amorphous vanadium structure induced by Mo doping and in-situ electrochemical activation is reported as a high-rate anode material for calcium ion batteries.The doping of Mo could destroy the lattice stability of VS4 material,enhancing the flexibility of the structure.The following electrochemical activation further converted the material into sulfide and oxides co-dominated composite(defined as MoVSO),which serves as an active material for the storage of Ca2+during cycling.Consequently,this amorphous vanadium structure exhibits excellent rate capability,achieving discharge capacities of 306.7 and 149.2 mAh g-1 at 5 and 50 A g-1 and an ultra-long cycle life of 2000 cycles with 91.2％capacity retention.These values represent the highest level to date reported for calcium ion batteries.The mechanism studies show that the material undergoes a partial phase transition process to derive MoVSO.This work unveiled the calcium storage mechanism of vanadium sulfide in aqueous electrolytes and accelerated the development of high-performance aqueous calcium ion batteries.

外文关键词：

calcium-ion batterieselectrochemical activationphase transformationvanadium sulfide

作者：

Hongchen Pan、Chunfang Wang、Minling Qiu、Yaxin Wang、Cuiping Han、Ding Nan

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作者单位：

College of Chemistry and Chemical Engineering Inner Mongolia University,Hohhot 010021,China

Songshan Lake Materials Laboratory,Dongguan,523808,China

The State Key Laboratory of Powder Metallurgy,Central South University,Changsha 410083,China

Faculty of Materials Science and Engineering/Institute of Technology for Carbon Neutrality,Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen,518055,China

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基金：

Open Research Found of Songshan Lake Materials LaboratoryGuangdong Basic and Applied Basic Research FoundationInner Mongolia Major Science and Technology ProjectAlashan League's Project of Applied Technology Research and Development FundLocal Science and Technology Development Project of the Central Government

项目编号：

2021SLABFN042022A15150109202020ZD0024AMYY2020-012022ZY0011

出版年：

2024

DOI：

10.1002/eem2.12690

能源与环境材料(英文)

ISSN：

年,卷(期)：2024.7(5)