石墨烯在LiFePO_4正极材料中的应用
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摘要
研究石墨烯在磷酸铁锂(LiFePO_4)正极材料的应用。石墨烯的电导率在105S/m左右,常规的超导炭黑的电导率在103S/m左右。正极材料加入6. 0%的石墨烯作为导电剂,在2. 00～3. 65 V充放电,10. 00 C放电容量保持率在第5次循环提高约5. 6%; 80. 0%容量时,5. 00 C循环,寿命延长近一倍;在-20℃时,0. 33 C充放电,容量保持率比加入6. 0%的超导炭黑混合导电剂的磷酸铁锂正极锂离子电池高出13. 0%。
The application of graphene in lithium iron phosphate( LiFePO_4) cathode materials was studied. Graphene conductivity was tested in the 105 S/m or so and the conventional superconducting carbon black in the 103 S/m or so. The battery cathode with6. 0% weight graphene as conductive agent could be improved. The capacity retention was improved by about 5. 6% at 10. 00 C discharge in 2. 00-3. 65 V after 5 th cycles. The cycle life was raised nearly doubled at 80. 0% capacity at 5. 00 C and the capacity retention was improved by 13. 0% at-20 ℃,when cycled at 0. 33 C in 2. 00-3. 65 V,comparing the 6% weight conventional LiFePO_4 cathode Li-ion battery.
The application of graphene in lithium iron phosphate( LiFePO_4) cathode materials was studied. Graphene conductivity was tested in the 105 S/m or so and the conventional superconducting carbon black in the 103 S/m or so. The battery cathode with6. 0% weight graphene as conductive agent could be improved. The capacity retention was improved by about 5. 6% at 10. 00 C discharge in 2. 00-3. 65 V after 5 th cycles. The cycle life was raised nearly doubled at 80. 0% capacity at 5. 00 C and the capacity retention was improved by 13. 0% at-20 ℃,when cycled at 0. 33 C in 2. 00-3. 65 V,comparing the 6% weight conventional LiFePO_4 cathode Li-ion battery.
引文
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[6]许汉良,王林,张帆,等.改善锂离子电池的低温充电性能[J].电池,2017,47(2):93-96.
[2]SU F Y,YOU C,HE Y B,et al. Flexible and planar graphene conductive additives for lithium-ion batteries[J]. J Mater Chem,2010,20(43):9 644-9 650.
[3]HUI B,HUANG F,TANG Y,et al. Study of Li Fe PO4cathode modified by graphene sheets for high-performance lithium ion batteries[J]. Electrochim Acta,2013,88(224):414-420.
[4]WANG Y,FENG Z S,CHEN J J,et al. Synthesis and electrochemical performance of Li Fe PO4/graphene composites by solid-state reaction[J]. Mater Lett,2012,71(11):54-56.
[5]靳尉仁,卢世刚,庞静.导电剂分布状态对锂离子电池性能的影响[J].电池,2010,40(6):297-299.
[6]许汉良,王林,张帆,等.改善锂离子电池的低温充电性能[J].电池,2017,47(2):93-96.