A new dual-ion hybrid energy storage system with energy density comparable to that of ternary lithium ion batteries,Journal of Materials Chemistry A

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A new dual-ion hybrid energy storage system with energy density comparable to that of ternary lithium ion batteries
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2020/01/03 , DOI: 10.1039/c9ta12660k
Shenggong He _{1,

2,

3,

4,

5} , Shaofeng Wang _{1,

2,

3,

4,

5} , Hedong Chen _{1,

2,

3,

4,

5} , Xianhua Hou _{1,

2,

3,

4,

5} , Zongping Shao _{6,

7,

8,

9,

10}

Affiliation

Supercapacitors that store energy through dual electrochemical layer capacitance or surface faradaic redox reactions are characterized by their fast charging/discharging capability, high power densities, and long cycling lifetime. However, the low energy density of supercapacitors seriously inhibits their practical applications. Herein, a dual-ion hybrid energy storage system using expanded graphite (EG) as the anion-intercalation supercapacitor-type cathode and graphite@nano-silicon@carbon (Si/C) as the cation intercalation battery-type anode is designed for efficient energy storage. The Si/C anode, synthesized by interfacial adhesion between nanosilicon and graphite with the help of pitch, demonstrates high specific capacity, remarkable cycling stability, and enhanced rate capability. Meanwhile, the EG cathode, which stores energy based on electrochemical double layer capacitance through its unique faradaic pseudocapacitive negative anion intercalation behaviour, demonstrates high energy densities of 462.9–356.5 W h kg⁻¹ at power densities of 403–7130 W kg⁻¹. The resulting Si/C//EG hybrid system delivered highly attractive energy densities of 252–222.6 W h kg⁻¹ at power densities of 215–5420 W kg⁻¹, which are superior to those of conventional electrochemical double layer capacitors and lithium-ion capacitors, making the dual-ion hybrid system a new type of energy storage device capable of achieving fast and efficient energy storage.

中文翻译：

一种新型双离子混合储能系统，其能量密度可与三元锂离子电池相媲美

通过双电化学层电容或表面法拉第氧化还原反应存储能量的超级电容器具有快速充电/放电能力，高功率密度和长循环寿命的特点。然而，超级电容器的低能量密度严重地限制了它们的实际应用。在此，为有效地设计使用膨胀石墨（EG）作为阴离子插层超级电容器型阴极和石墨@纳米硅@碳（Si / C）作为阳离子插层电池型阳极的双离子混合储能系统，能源储备。通过纳米硅和石墨之间的界面粘合并借助沥青合成的Si / C阳极具有高比容量，出色的循环稳定性和增强的倍率性能。同时，EG阴极^-1，功率密度为403-7130 W kg^-1。所产生的Si / C // EG混合系统递送252-222.6 W时公斤的极具吸引力的能量密度^-1在215-5420功率密度W¯¯千克^-1，这是优于传统电化学双层电容器和锂的离子电容器，使双离子混合系统成为一种新型的能量存储设备，能够实现快速高效的能量存储。

更新日期：2020-02-10

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