Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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The effect of precursor solution pH on the energy storage performance of 𝛼-MnO2 cathode for zinc-ion batteries synthesized via hydrothermal method

Zn 이온 배터리용 양극 𝛼-MnO2의 수열 합성 시 전구체 용액의 pH가 에너지 저장 성능에 미치는 영향

  • Sang-Eun Chun (School of Materials Science and Engineering, Kyungpook National University)
  • 전상은 (경북대학교 첨단소재공학부)
  • Received : 2024.08.12
  • Accepted : 2024.08.23
  • Published : 2024.08.31
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Abstract

𝛼-MnO2 as a cathode material for Zn-ion batteries allows insertion and extraction of Zn ions within its tunnel structure during charge and discharge. The morphology and crystal structure of 𝛼-MnO2 particles critically determine their electrochemical behavior and energy storage performance. In this study, 𝛼-MnO2 was synthesized from precursor solutions under varying pH conditions using a hydrothermal method. The effects of pH values on the morphology, crystal structure, and electrochemical performance were systematically analyzed. The analysis revealed that materials synthesized at higher pH levels exhibited elongated and narrow nanorods with a lower specific surface area. In contrast, those formed at lower pH levels showed shorter, thicker nanorods with a higher specific surface area. This increased surface area at a lower pH enhanced the specific capacitance by providing a greater electrode/electrolyte interfacial area. By contrast, the material synthesized at higher pH conditions demonstrated superior rate capability, attributed to its crystal structure with wider lattice spacings. Wide lattice parameters in the material synthesized at higher pH conditions facilitated easier ion transport than at lower pH levels. Consequently, the study confirms that adjusting the pH of the precursor solution can optimize the electrochemical properties of 𝛼-MnO2 for Zn-ion batteries.

Keywords

Acknowledgement

이 성과는 2022년도 과학기술정보통신부의 재원으로 한국연구재단의 지원을 받아 수행된 연구임(NRF-2022R1A2C1009922).

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