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A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
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Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
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对于耐用固态电池的空隙抑制石榴电解质.

Seokjae Hong1,2,3, Kwang Ho Shin4, Kyoung Sun Kim1,2

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控制填充石榴石固体电解质 (SE) 中的内在空缺是稳定的全固态电池 (ASSB) 的关键. 这项研究优化了含量,以抑制空缺,提高性能和稳定性.

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富含/氧的烧结方式所有固态电池都是固态电池.石榴石 固体电解质 石榴石 固体电解质界面稳定性 界面稳定性本质的空缺是存在的.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 电化学 电化学 电化学
  • 固态化学 固态化学

背景情况:

  • 立方石榴石固体电解质 (SE) 由于其高离子导电性和金属稳定性,对全固态电池 (ASSB) 是有前途的.
  • 在石榴石SE中形成的内在和氧空缺,在烧结过程中形成,导致接口问题和短路.

研究的目的:

  • 在Li$_{6.5}$La$_{3}$Zr$_{1.5}$Ta$_{0.5}$O$_{12}$ (LLZTO) 中量化内在的空缺.
  • 制定一项战略,抑制空缺职位,并创建填充石榴石SE,以提高ASSB的绩效.

主要方法:

  • 在烧结过程中调节绿色颗粒和床粉中的含量.
  • 空位度和占用量的表征.
  • 对称和混合细胞的电化学测试.

主要成果:

  • 实现了空位抑制,填充的LLZTO,其Li占用率> 6.5 pfu和O空位< 0.02 pfu.
  • 经过优化后的SE.的化学和空气稳定性得到了改进.
  • 呈现出高临界电流密度 (在30°C时为1.00 mA cm$^{-2}$,在60°C时为1.75 mA cm$^{-2}$).

结论:

  • 控制内在空缺对于提高石榴石电解质的结构和电化学完整性至关重要.
  • 优化填充的LLZTO显示出极好的循环稳定性 (>3000小时在对称细胞中,2000个周期在混合细胞中,90%的保留率).
  • 这项工作促进了石榴石SE在ASSB中的实际应用.