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<p>Hard carbon is promising anode for high performance lithium-ion batteries at low temperature. However, the lithium storage mechanism in hard carbon at low temperature remains unclear with no consensus. Herein, the evolution of lithium storage mechanism in hard carbon synthesized over a wide pyrolysis temperature range of 800–1100&#xa0;°C is investigated. The cyclic&#xa0;voltammetry&#xa0;tests reveal that the HC-1000 anode exhibits the highestpseudo-capacitive contribution at low temperature among various hard carbon anodes. Due to the highest pseudo-capacitive contribution, the HC-1000 anode displays highest specific capacity and excellent cycle performance at low temperature. This work provides new perspective for improving low temperature performance through developing hard carbon anode with pseudo-capacitive storage mechanism.</p>

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Revealing evolution of lithium storage mechanism in hard carbon for designing advanced low temperature li-ion batteries

  • 期刊论文

  • 发表日期：

    2025年4月14日

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  • Jianqiang Guo,
  • Heng Guo,
  • Yizhi Zhu

摘要

Hard carbon is promising anode for high performance lithium-ion batteries at low temperature. However, the lithium storage mechanism in hard carbon at low temperature remains unclear with no consensus. Herein, the evolution of lithium storage mechanism in hard carbon synthesized over a wide pyrolysis temperature range of 800–1100 °C is investigated. The cyclic voltammetry tests reveal that the HC-1000 anode exhibits the highestpseudo-capacitive contribution at low temperature among various hard carbon anodes. Due to the highest pseudo-capacitive contribution, the HC-1000 anode displays highest specific capacity and excellent cycle performance at low temperature. This work provides new perspective for improving low temperature performance through developing hard carbon anode with pseudo-capacitive storage mechanism.