Prelithiation of hard carbon and its electrochemical performance

doi:10.19799/j.cnki.2095-4239.2021.0239

Abstract

Abstract:

The positive electrode was a lithium titanate@activated carbon composite material, and the negative electrode was commercial hard carbon. A series of steps were taken to prepare a lithium-ion capacitor (LIC) with pre-inserted lithium hard carbon/lithium titanate@ activated carbon. Pre-intercalating hard carbon with various lithium contents resulted in a variety of pre-inserted lithium hard carbon pole pieces in this thesis. The LIC assembled with the prepared pre-inserted lithium hard carbon pole pieces was then electroporated in a series of steps. The chemical performance test investigated the effect of lithium insertion into the hard carbon pole piece on the specific energy and specific power of LIC. The results showed that doping lithium powder in hard carbon can significantly increase the specific energy of LIC while decreasing its specific power. The assembled LIC when the mass ratio of hard carbon to lithium powder was 3∶1 was one of them. After 2000 cycles of charge and discharge at a current density of 2 A/g, the energy density can reach 29.69 W·h/kg, the power density can reach 7.57 kW/kg, and the capacity retention rate can reach 83.11%.

Key words: pre-embedded lithium, lithium ion capacitor, specific power, specific energy

CLC Number:

TM 911

Qingjiang ZHAO, Guifeng ZHANG. Prelithiation of hard carbon and its electrochemical performance[J]. Energy Storage Science and Technology, 2021, 10(6): 2112-2116.

Figures/Tables 7

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Table 2

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References 7

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样品	S_BET/(m²·g^-1)	S_mic/(m²·g^-1)
钛酸锂	13.1	11.2
活性炭	1194	1030
硬碳	15.1	14.2

充电次数	容量/(mA·h)	充放电效率/%
第1次充电	974.6	88.1
第1次放电	858.6	88.1
第2次充电	970.5	87.7
第2次放电	851.4	87.7
第3次充电	968.3	87.7
第3次放电	849.3	87.7

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