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Based on the special three-dimensional interlayered frame, transition metal oxalatesTransition metal oxalates (TMOxs) exhibit excellent lithiumLithium storage ability. However, the inevitable introduction of crystal waterCrystal water during preparation and difficulty in obtaining 100% anhydrous material limit their commercial application. Herein, in view of the discrepancy of solubility products (Ksp), we fabricated the hydrated TMOxs with various morphologiesMorphologies by a simple solvothermal process. Owning to the interface lithiumLithium storage, metal catalysis and crystal waterCrystal water effects, CuC2O4·xH2O and NiC2O4·xH2O electrodes exhibit excellent electrochemical performance among all TMOxs materials. Among them, CuC2O4·xH2O shows higher electrochemical activity and better variable specific capacity of 638 mAh g−1 after cycling 100 times at 2 A g−1. In addition, the presence of crystal waterCrystal water also promotes the formation of low-resistance SEI film on the CuC2O4·xH2O and NiC2O4·xH2O electrodes, thereby increasing the ICE of the electrodes. This work provides a novel and systematic point for TMOxs anode materials toLithium-ion battery understand the beneficial and disadvantageous role of crystal waterCrystal water on lithiumLithium storage.

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Controversial Role of Crystal Water for Transition Metal Oxalates on Lithium Storage Behavior

  • 会议论文

  • 发表日期：

    2025年

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  • Keqi Chen,
  • Keyu Zhang,
  • Rui Yan,
  • Guangping Zi,
  • Minghao Ye,
  • Yanmei Miu,
  • Junxiao Chen,
  • Bin Yang,
  • Yaochun Yao

摘要

Based on the special three-dimensional interlayered frame, transition metal oxalatesTransition metal oxalates (TMOxs) exhibit excellent lithiumLithium storage ability. However, the inevitable introduction of crystal waterCrystal water during preparation and difficulty in obtaining 100% anhydrous material limit their commercial application. Herein, in view of the discrepancy of solubility products (Ksp), we fabricated the hydrated TMOxs with various morphologiesMorphologies by a simple solvothermal process. Owning to the interface lithiumLithium storage, metal catalysis and crystal waterCrystal water effects, CuC2O4·xH2O and NiC2O4·xH2O electrodes exhibit excellent electrochemical performance among all TMOxs materials. Among them, CuC2O4·xH2O shows higher electrochemical activity and better variable specific capacity of 638 mAh g−1 after cycling 100 times at 2 A g−1. In addition, the presence of crystal waterCrystal water also promotes the formation of low-resistance SEI film on the CuC2O4·xH2O and NiC2O4·xH2O electrodes, thereby increasing the ICE of the electrodes. This work provides a novel and systematic point for TMOxs anode materials toLithium-ion battery understand the beneficial and disadvantageous role of crystal waterCrystal water on lithiumLithium storage.