在高压超级电容器中加气的起源和演变的整个景观
Qian Sun1,2, Zonglin Yi1, Yafeng Fan1,2
1CAS Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
ACS applied materials & interfaces
|November 16, 2023
概括
高压超级电容器 (SC) 中的气体产生是一个关键问题. 这项研究揭示了残留水和功能组导致气体,新物种表明3.0V的故障.
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:
- 使用乙基电解质 (基于AN的SC) 的超级电容器提供高压 (3.0V) 性能.
- 高压运行期间的气体产生是一个重大挑战,限制了设备的寿命和可靠性.
- 在高电压下基于AN的SC中气体演变的精确机制仍然不完全理解.
研究的目的:
- 综合调查基于AN的SC在高电压 (2.7V和3.0V) 上运行的气体生成的起源和演变机制.
- 在现实的条件下,确定在SC老化过程中导致气体产生的关键因素.
- 为了确定气体物种作为基于3.0VAN的SC的潜在故障标志.
主要方法:
- 在22450型圆柱形电池上进行了浮动测试,使用商业AN基电解质.
- 分析了在2.7V和3.0V的老化过程中产生的气体物种.
- 用密度函数理论 (DFT) 的计算来支持实验结果.
主要成果:
- 剩余水和含氧的功能组 (基,基) 被确定为产生气体的主要来源.
- 独特的气体物种,包括CO2,NH3和基,在电池故障后仅在3.0V时被检测到.
- 该研究提供了实验证据和理论计算,阐明了气体产生机制.
结论:
- 这些发现为基于AN的SC在高电压下的故障机制提供了基本的见解.
- 在3.0V的特定气体演变是设备故障的关键指标.
- 这项研究为改进基于3.0 V AN的SC的故障评估和寿命设计提供了指导.
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