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<p>Stack pressure is a key factor for the electrochemical performances of all-solid-state lithium metal batteries (ASSLMBs). Optimizing the stack pressure is important for promoting the interfacial performances of garnet-type ceramic electrolyte (Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub>) with Li metal anode. In this work, ASSLMBs assembled with Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> electrolytes are investigated under various stack pressures. Experimental results show that 3&#xa0;MPa stack pressure is the optimal choice. The Li/Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub>/LiFePO<sub>4</sub> battery under 3&#xa0;MPa achieves a discharge capacity of 129.2 mAh g<sup>− 1</sup> after 100 charge/discharge cycles with a capacity retention rate of 82.1%. The mechanism by which stack pressure affects the interface performance of Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> electrolyte with Li anode is analyzed. A moderate stack pressure enlarges the contact area between Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> electrolyte and Li anode through elastic deformation, reducing the interface resistance. Additionally, it facilitates the plastic flow of Li anode via stress yield, minimizing the contact loss of Li anode during charge/discharge process. This work presents the significance of exerting a moderate stack pressure to optimize interfacial performance between Li<sub>6.4</sub>La<sub>3</sub>Zr<sub>1.4</sub>Ta<sub>0.6</sub>O<sub>12</sub> electrolyte and Li anode.</p>

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Optimization of stack pressure on interfacial performance of Li6.4La3Zr1.4Ta0.6O12 electrolyte with lithium anode for all-solid-state batteries

  • 期刊论文

  • 发表日期：

    2026年2月27日

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  • Zhijie Zhang,
  • Jian Cao,
  • Xueling Zhang,
  • Huan Li,
  • Xingjiang Liu,
  • Qiang Xu

摘要

Stack pressure is a key factor for the electrochemical performances of all-solid-state lithium metal batteries (ASSLMBs). Optimizing the stack pressure is important for promoting the interfacial performances of garnet-type ceramic electrolyte (Li6.4La3Zr1.4Ta0.6O12) with Li metal anode. In this work, ASSLMBs assembled with Li6.4La3Zr1.4Ta0.6O12 electrolytes are investigated under various stack pressures. Experimental results show that 3 MPa stack pressure is the optimal choice. The Li/Li6.4La3Zr1.4Ta0.6O12/LiFePO4 battery under 3 MPa achieves a discharge capacity of 129.2 mAh g− 1 after 100 charge/discharge cycles with a capacity retention rate of 82.1%. The mechanism by which stack pressure affects the interface performance of Li6.4La3Zr1.4Ta0.6O12 electrolyte with Li anode is analyzed. A moderate stack pressure enlarges the contact area between Li6.4La3Zr1.4Ta0.6O12 electrolyte and Li anode through elastic deformation, reducing the interface resistance. Additionally, it facilitates the plastic flow of Li anode via stress yield, minimizing the contact loss of Li anode during charge/discharge process. This work presents the significance of exerting a moderate stack pressure to optimize interfacial performance between Li6.4La3Zr1.4Ta0.6O12 electrolyte and Li anode.