A Highly Reversible Aqueous Ammonium‐Ion Battery based on α‐MoO3/Ti3C2Tz Anodes and (NH4)xMnO2/CNTs Cathodes. Issue 3 (18th January 2023)

• Record Type: Journal Article
• Authors: Yang, Li; Zheng, Wei; Halim, Joseph; Rosen, Johanna; Sun, ZhengMing; Barsoum, Michel W.
• Is Part Of: Batteries & supercaps. Volume 6:Issue 3(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-01-18
• Subjects: α-MoO3 -- aqueous ammonium-ion batteries -- energy and power densities -- MnO2 birnessite -- MXene -- self-discharge; Electrochemistry -- Periodicals; Electrodes -- Periodicals; Electric batteries -- Periodicals; 621.31242
• DOI: 10.1002/batt.202200432
• Languages: English
• ISSNs: 2566-6223

Abstract

Abstract: Aqueous ammonium‐ion batteries (AAIBs) are appealing due to their relatively low cost and good rate performance. In general, AAIBs are environmentally friendlier than their non‐aqueous counterparts. However, it is still a challenge to achieve highly reversible AAIBs with decent voltages and energy/power densities. Herein, we report on a full‐cell configuration using α‐MoO3 /Ti3 C2 T z films as anodes, and (NH4 ) x MnO2 /CNTs films as cathodes in a 1 M ammonium acetate (NH4 Ac) electrolyte. At 2 V, the operating cell voltage, OCV, is one of the highest reported for AAIBs. A maximum energy density of ∼32 Wh kg −1 (∼54 Wh L −1 ) at 0.2 A g −1 and a maximum power density of ∼10 kW kg −1 (∼17 kW L −1 ) at 10 A g −1 are attained. When the full cells are cycled 2, 000 times at 1 A g −1 they retain ∼73 % of their initial capacity. When cycling at 10 A g −1, ∼96 % of capacity is retained after 43, 500 cycles. After 10 h, self‐discharge reduces the OCV to ∼72 % of its original value. This work provides a roadmap for developing high performance AAIBs with high voltages and high energy/power densities. Before this is possible it is imperative that the self‐discharge rate be substantially reduced. Abstract : Aqueous ammonia ion batteries (AAIBs) using α‐MoO3 /Ti3 C2 T z films as anodes, and (NH4 ) x MnO2 /CNTs films as cathodes in a 1 M ammonium acetate electrolyte were reported. At 2 V, the operating cell voltage is one of the highest reported for AAIBs. A maximum energy density of ∼32 Wh kg −1 (∼54 Wh L −1 ) at 0.2 A g −1 and a maximum power density of ∼10 kW kg −1 (∼17 kW L −1 ) at 10 A g −1 are attained.