【直播】香港城市大学支春义教授：Zinc ion batteries for safe energy storage

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直播信息

报告题目

Zinc ion batteries for safe energy storage

报告人（单位）

支春义（香港城市大学）

报告时间

2022年3月14日（周一）15:00

主办方

电子科技大学材料与能源学院

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报告人介绍

支春义，2004年中科院物理所取得博士学位，随后到日本物质材料研究机构工作，任博士后研究员，研究员（faculty）以及主任研究员（永久职位）。目前在香港城市大学材料科学与工程系任教授。研究方向为可穿戴柔性电存储器件，锌离子电池，水系储能电池等。已发表有关SCI论文超过420篇，他引超过39000次，H因子为105，专利授权80项。编辑著作两本。支春义博士是Nano Research Energy创刊主编，Materials Research Letters和Materials Future副主编。支春义博士是Clarivate Analytics全球高被引科学家（2019-2021材料科学），香港青年科学院青年院士，获得城大校长奖，青年杰出研究奖，NML研究者奖，北京市自然科学一等奖。

报告摘要

Development of energy storage system in the past year focus on improvement of energy density. While the progress is remarkable, safety problems of lithium ion batteries (LIB) have been intensively exposed. On one hand, LIB is not intrinsically safe with very active anode, flammable electrolyte and oxygen-releasing cathode; on the other hand, many application scenarios actually don’t require very high energy density.
We work on aqueous electrolyte batteries to achieve both high energy density and superior safety performance. Although a large number of intercalation cathode materials for aqueous Zn batteries have been reported, limited intercalation capacity precludes achieving a higher energy density. Here we develop a high-performance aqueous Zn battery based on BiSb alloy (Bi_0.5Sb_0.5) using a high-concentrated strong-basic polyelectrolyte. The BiSb cathode delivers large capacity of 512 mAh g^-1 at 0.3 Ag^-1 and superior rate capability of 90 mAh g^-1 even at 20 Ag^-1, and long-term cyclability with capacity retentions of 184 mAh g^-1 after 600 cycles at 0.5 Ag^-1 and 130 mAh g^-1 after 1300 cycles at 1 Ag^-1. Remarkably, even at temperatures as low as -10 and -20 °C, capacities of  210 and 197 mAh g^–1 are reserved at 1 Ag^-1, respectively. Moreover, the prepared pouch Zn//BiSb battery delivers a high energy density of 348 Wh kg^-1_BiSb at 0.3 Ag^-1. 
In addition, we also develop various approaches to stabilize the Zn anode. We accurately quantifying the hydrogen evolution in Zn metal battery by in-situ battery-gas chromatography-mass analysis. Then, we propose an vapor-solid method for an highly electronically insulating (0.11 mS×cm^-1) but high Zn²⁺ ion conductive (80.2 mS×cm^-1) ZnF₂ solid ion conductor with high Zn²⁺ transfer number (0.65) to isolate Zn metal from liquid electrolyte, which can not only prohibit over 99.2 % parasitic hydrogen evolution reaction during cycling but also guide uniform Zn electrodeposition. Meanwhile, Zn@ZnF₂//Zn@ZnF₂ symmetric cell exhibits excellent stability over 2500 h (over 6250 cycles) with 1 mAh×cm^-2 of Zn reversibly cycled at 5 mA×cm^-2, and stable cycling under ultrahigh current density and areal capacity (10 mA×cm^-2, 10 mAh×cm^-2) over 590 h (285 cycles), which far outperforms all reported Zn metal anode in aqueous system. In light of the superior Zn@ZnF₂ anode, the practical-level aqueous Zn@ZnF₂//MnO₂ batteries (~3.2 mAh×cm^-2) shows remarkable cycling stability over 1000 cycles with 93.63 % capacity retained at ~100 % coulombic efficiency. 

关键词：Zinc ion batteries, Zn metal anode stability, high performance cathode, battery safety

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编辑：王茹茹

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