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相关概念视频

Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
667
Ion-Exchange Chromatography01:09

Ion-Exchange Chromatography

786
Ion-exchange chromatography, or IEC, is a technique for separating ions based on their affinity for the stationary phase. The stationary phase is a cross-linked polymer resin with covalently attached ionic functional groups. The functional groups can be either positively charged (cation exchangers) or negatively charged (anion exchangers). A cation exchanger consists of a polymeric anion and active cations, while an anion exchanger is a polymeric cation with active anions. The choice of...
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相关实验视频

Updated: Sep 16, 2025

Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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通过使用用于离子电池的电化学活性碳醇聚合物分离器实现了相间工程.

Bingning Wang1,2, Lihong Gao1, Zhenzhen Yang1

  • 1Chemical Sciences and Engineering Division, Argonne National Laboratory, 9700 South Cass Avenue, Lemont, IL 60439, USA.

Polymers
|July 12, 2025
PubMed
概括

电活性碳醇聚合物通过在分离器上形成保护界面来提高离子电池的性能. 这种修改提高了循环稳定性,并减少了-丰富的多层氧化物//石墨细胞中的过渡金属溶解.

关键词:
碳醇是碳醇的一种物质.完整的细胞全细胞.离子电池是一种离子电池.富含 - 的丰富的.聚合物的氧化聚合物.分离器的修改分离器的修改

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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
  • 聚合物科学 聚合物科学

背景情况:

  • 在离子电池中,分离器通常是惰性的.
  • 以前的工作使用了电活性聚合物进行过电保护或酸清理.
  • 这项研究探讨了电活性聚合物在相间工程中的新应用.

研究的目的:

  • 调查使用电活性碳醇聚合物作为分离器涂层的情况.
  • 为了提高-丰富的多层氧化物//石墨全细胞的循环性能.
  • 了解相间形成的机制及其对电池性能的影响.

主要方法:

  • 商用Celgard 2325分离器涂上共聚合物9--9H-碳酸- (PCP) 和聚9-乙烯基碳酸 (PVC).
  • 进行电化学表征,包括循环电压测量和dQ/dV分析.
  • 进行核磁共振和尸体分析.

主要成果:

  • 在第一个充电周期期间观察到碳醇聚合物的不可逆转氧化.
  • 证明了碳醇聚合物积极参与相间形成.
  • 鉴定了改造细胞中改善的循环性能,归因于更高质量的固体电解质介面 (SEI) 和阴极电解质介面 (CEI).

结论:

  • 分离器上的电活性碳醇聚合物涂层可以显著提高离子电池循环性能.
  • 该机制涉及聚合物氧化和有益无机SEI和CEI层的形成.
  • 这些接相有效地缓解过渡金属溶解,并改善细胞的整体稳定性.