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Capacity Decay Mechanism of the LCO + NMC532/Graphite Cells Combined with Post-Mortem Technique

Author

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  • Linjing Zhang

    (National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Jiaotong University, Beijing 100044, China)

  • Jiuchun Jiang

    (National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Jiaotong University, Beijing 100044, China)

  • Weige Zhang

    (National Active Distribution Network Technology Research Center, Beijing Jiaotong University, Beijing 100044, China
    Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Jiaotong University, Beijing 100044, China)

Abstract

Lithium ion batteries are widely used in portable electronics and transportations due to their high energy and high power with low cost. However, they suffer from capacity degradation during long cycling, thus making it urgent to study their decay mechanisms. Commercial 18650-type LiCoO 2 + LiNi 0.5 Mn 0.3 Co 0.2 O 2 /graphite cells are cycled at 1 C rate for 700 cycles, and a continuous post-mortem analysis is performed. Based on these tests, the decay mechanism of the cells is finally proposed. The changes of differential capacity curves of the full cells show that the loss of active materials, loss of lithium ions and cell polarization are the main factors contributing to capacity loss. Non-fully charging of the electrodes is also one of the reasons, but only takes up a minor portion. Impedance results indicate that the charge transfer resistance becomes larger during cycling, especially at low state of charge. Morphology and surface chemistry analysis demonstrates that the electrode particles after cycling exhibit some minor cracks and some additional layers are formed on surfaces of both the cathode and anode electrodes. All of these effects may contribute to the impedance increase, and consequently lead to degradation of the full cells. Thus, a good protection of the surface of the cathode and anode shows great potential to improve the capacity maintenance and prolong the cycle life of the cells.

Suggested Citation

  • Linjing Zhang & Jiuchun Jiang & Weige Zhang, 2017. "Capacity Decay Mechanism of the LCO + NMC532/Graphite Cells Combined with Post-Mortem Technique," Energies, MDPI, vol. 10(8), pages 1-16, August.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:8:p:1147-:d:107017
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    References listed on IDEAS

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    1. M. Armand & J.-M. Tarascon, 2008. "Building better batteries," Nature, Nature, vol. 451(7179), pages 652-657, February.
    2. J.-M. Tarascon & M. Armand, 2001. "Issues and challenges facing rechargeable lithium batteries," Nature, Nature, vol. 414(6861), pages 359-367, November.
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    Cited by:

    1. Cornelius Satria Yudha & Soraya Ulfa Muzayanha & Hendri Widiyandari & Ferry Iskandar & Wahyudi Sutopo & Agus Purwanto, 2019. "Synthesis of LiNi 0.85 Co 0.14 Al 0.01 O 2 Cathode Material and its Performance in an NCA/Graphite Full-Battery," Energies, MDPI, vol. 12(10), pages 1-14, May.
    2. Kriegler, Johannes & Hille, Lucas & Stock, Sandro & Kraft, Ludwig & Hagemeister, Jan & Habedank, Jan Bernd & Jossen, Andreas & Zaeh, Michael F., 2021. "Enhanced performance and lifetime of lithium-ion batteries by laser structuring of graphite anodes," Applied Energy, Elsevier, vol. 303(C).
    3. Cornelius Satria Yudha & Soraya Ulfa Muzayanha & Mintarsih Rahmawati & Hendri Widiyandari & Wahyudi Sutopo & Muhammad Nizam & Sigit Puji Santosa & Agus Purwanto, 2020. "Fast Production of High Performance LiNi 0.815 Co 0.15 Al 0.035 O 2 Cathode Material via Urea-Assisted Flame Spray Pyrolysis," Energies, MDPI, vol. 13(11), pages 1-17, June.
    4. Francesca Pistorio & Davide Clerici & Francesco Mocera & Aurelio Somà, 2022. "Review on the Experimental Characterization of Fracture in Active Material for Lithium-Ion Batteries," Energies, MDPI, vol. 15(23), pages 1-47, December.

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