首页> 外文期刊>Advanced energy materials >Healable Structure Triggered by Thermal/Electrochemical Force in Layered GeSe2 for High Performance Li-Ion Batteries
【24h】

Healable Structure Triggered by Thermal/Electrochemical Force in Layered GeSe2 for High Performance Li-Ion Batteries

机译:高性能锂离子电池层状GeSe2中热/电化学力触发的可修复结构

获取原文
获取原文并翻译 | 示例
           

摘要

The metal sulfide or selenides have attracted increasing attention for high-energy lithium-ion batteries due to their unique layer structure flexibility, higher conductivity, and lower voltage polarization than metal oxides. However, low initial coulomb efficiency (ICE), serious structure destruction, and irreversible bonding chemistry are still big challenges for their practical application. Herein, layer GeSe2 and its carbon composite are synthesized by high-energy ball milling and it is surprisingly found that crystalline c-GeSe2 possesses higher reversible capacity and better rate performances than their amorphous counterparts. More specially, the broken GeSe bondings upon lithiation are also observed to regenerate after delithiation. These unusual phenomena are investigated by both experimental tools and theoretical calculations. Compared to other typical MX2 (M = Mo, W, X = S, Se), the electronegativity of Ge is more close to selenium and the formation energy of GeSe bonding is much smaller. Thus, a mild driven force such as thermoheating at low temperature can recover the ordered layer structure, helping to heal the high conductivity and unimpeded Li diffusion pathways for crystalline GeSe2. Similarly, electrochemical delithium force also triggers the rebuilding of GeSe bonding upon Li-extraction, boosting GeSe2/C with large capacity (1050 mA h g(-1)), ultrahigh ICE (94%), and cycling stability.
机译:由于金属硫化物或硒化物具有独特的层结构柔韧性,较高的导电性和比金属氧化物低的电压极化,因此已引起高能锂离子电池越来越多的关注。然而,低的初始库仑效率(ICE),严重的结构破坏和不可逆的键合化学仍然是其实际应用的巨大挑战。本文中,GeSe2层及其碳复合材料是通过高能球磨合成的,令人惊讶地发现,结晶c-GeSe2比其非晶态对应物具有更高的可逆容量和更好的倍率性能。更具体地,在锂化之后还观察到断裂的GeSe键断裂在锂化之后再生。通过实验工具和理论计算研究了这些异常现象。与其他典型的MX2(M = Mo,W,X = S,Se)相比,Ge的电负性更接近硒,GeSe键的形成能小得多。因此,适度的驱动力(例如在低温下进行热加热)可以恢复有序的层结构,有助于修复高电导率和不受阻碍的晶体GeSe2的Li扩散途径。类似地,电化学脱锂力还会在锂提取时触发GeSe键的重建,从而以大容量(1050 mA h g(-1)),超高ICE(94%)和循环稳定性增强GeSe2 / C。

著录项

  • 来源
    《Advanced energy materials》 |2018年第18期|1703635.1-1703635.12|共12页
  • 作者单位

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China;

    Wuhan Univ Sci & Technol, State Key Lab Refractories & Met, Wuhan 430081, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China;

    Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Sch Mat Sci & Engn, Wuhan 430074, Hubei, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    GeSe2; healable structures; high coulomb efficiencies; layered structures; lithium-ion batteries;

    机译:GeSe2;可修复结构;高库仑效率;分层结构;锂离子电池;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号