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Weak Acid Solutions04:02

Weak Acid Solutions

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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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在高性能3.2V水性离子电池中定制Li3N含有补充梯度固体电解质介相.

Fengcheng Tang1, Zhuoni Zhao1, Fangkun Li2

  • 1School of Metallurgy and Environment, National Energy Metal Resources and New Materials Key Laboratory, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha, 410083, PR China.

Advanced materials (Deerfield Beach, Fla.)
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概括

研究人员开发了一种新方法,在水性离子电池 (ALIB) 中创建稳定的化 (Li3N) 固体电解质介相 (SEI). 这一突破通过防止水解和改善界面稳定性,使得更高的电压和更长的电池寿命成为可能.

关键词:
胺是辅溶剂中的一种溶剂.水性离子电池的水性离子电池互补的梯度梯度是相辅相成的化的化的化.这是一个过度潜在的潜力.

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科学领域:

  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 水性离子电池 (ALIB) 在工作电压 (<3V) 和接口稳定性方面面临限制.
  • 化 (Li3N) 是非水性电池中高压固体电解质间相 (SEI) 的关键成分,易于在水性电解质中溶解,阻碍其在ALIB中的使用.
  • 现有的ALIBs遭受不稳定的电极/电解质介面和在更高电压下发生的演变反应.

研究的目的:

  • 为了克服ALIBs中低工作电压和不稳定的介面相的局限性.
  • 为了使含有Li3N的补充梯度SEI在水性介质中进行前所未有的构建.
  • 推进高压,长期稳定的ALIBs的发展.

主要方法:

  • 采用了一种双方向的策略,涉及不对称的胺共溶剂 (N-甲基胺,NMF) 和超潜在驱动的界面工程.
  • 应用适当的超电位 (0.3V) 来驱动形成含有Li3N的补充梯度SEI.
  • 研究了LiF/Li3N SEI的潜在三步形成机制,涉及TFSI,NMF和H2O的顺序分解.

主要成果:

  • 成功构建了一个强大的互补梯度SEI,由外部LiF层和内部稳定的Li3N层组成,通过在水性介质中的内部自我保护.
  • 量身定制的SEI结构显示出协同作用的化学稳定性和快速形成动态,有效地抑制了进化反应.
  • Mn2O4 干 Li4Ti5O12 电池表现出极好的循环稳定性,在 2C 时保持 700 个循环,在 5C (3.2 V) 时保持 2000 个循环的容量.

结论:

  • 制定了一种新的策略,用于稳定含有Li3N的电极/电解质介面在水性电池中.
  • 证明了推进高压和长期稳定的ALIB的独特途径.
  • 开发的方法为下一代水性能源存储系统提供了一个有希望的方法.