Recent progress in carbon fiber electrodes for structural supercapacitors composites
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摘要: 在能源危机与生态环境持续恶化的大背景下,开发先进储能技术成为各国竞相研究的重点。将碳纤维作为多功能结构电极与聚合物电解质复合,制备兼具储能与结构承载的复合材料结构超级电容器(Structural supercapacitor composites,SSC),有望满足现代装备对高效储能与轻量化结构的双重需求,在新能源汽车、航空航天等领域具有广泛应用前景。碳纤维电极是SSC的重要组件,承担着富集电荷与力学承载的双重任务,应具有高比表面积、优良的力学性能及树脂电解质浸润能力。然而常规碳纤维表面光滑,比表面积小,化学惰性大,不利于电荷的存储及树脂电解质的浸润,限制了高性能SSC的制备与应用,必须对其进行表面改性处理。本文介绍了SSC用碳纤维电极材料的研究现状,重点阐述了刻蚀活化改性、碳基活性材料修饰、纳米金属化合物活性材料修饰、聚苯胺修饰等改性方法,总结了不同碳纤维电极制备方法对SSC储能及力学性能的影响行为与机制,归纳了各自优缺点,并展望了SSC用碳纤维电极研制面临的挑战及发展趋势。Abstract: In the context of energy crisis and continuous deterioration of ecological environment, the development of advanced energy storage technology has become the focus of competing research in global. Structural supercapacitor composites (SSC) with both energy storage and structural bearing capacity are developed by using multifunctional carbon fiber electrode and polymer electrolyte, which is expected to meet the dual demands of modern equipment for efficient energy storage and lightweight structures. Therefore, SSC has a wide application prospect in electric vehicles, aerospace and other fields. Carbon fiber electrode is a key component of SSC, which plays an important role in charge accumulation and mechanical loading. It should have high specific surface area, excellent mechanical properties and good wettability with polymer electrolyte. However, the pristine surface of carbon fiber is smooth and chemically inert, which is not conducive to ion storage and resin electrolyte infiltration in carbon fiber electrodes, and thus limits the preparation and application of high-performance SSC, so surface modification of carbon fiber electrode is necessary. This paper introduces the current research status of carbon fiber electrode materials for SSC, mainly focuses on several important surface modification methods of carbon fiber (such as chemical etching activation, modification with carbon-based active materials, modification with nano metal compounds and polyaniline modification), summarizes the influence of different carbon fiber electrode preparation methods on the energy storage and mechanical properties of SSC and the corresponding mechanisms, and their respective advantages and disadvantages. The challenges and development trend of carbon fiber electrode for SSC are also prospected.
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图 11 SSC制备过程示意图:(a) CF → gCF : 等离子体强化气相沉积技术(rf-PECVD)在裸碳纤维布上生长石墨烯纳米片(GNFs);(b) gCF → UgCF:通过尿素活化石墨烯纳米片沉积过的碳纤维布;(c) CF–(2GFs:SPE)–CF叠放的多功能结构超级电容器(MSS)结构示意图;(d)树脂灌注法制备碳纤维增强聚合物(CFRP)复合材料 MSS 层压板[29]
PEGDGE—Polyethylene glycol diglycidyl ether; IL—Ionic liquid; TETA—Triethylene-tetramine; GFs—Glass fabrics
Figure 11. Schematic illustration of steps used for the fabrication of structural supercapacitor: (a) CF → gCF : direct growth of graphene nanoflakes (GNFs) on bare carbon fiber (CF) fabrics by plasma enhanced vapor deposition technique (rf-PECVD); (b) gCF → UgCF : urea activation of GNFs-coated carbon fiber ( gCF ) fabrics ( UgCF ); (c) CF–(2GFs:SPE)–CF lay-up configuration of multifunctional structural supercapacitor (MSS); (d) Fabrication of carbon fiber reinforced polymer (CFRP) composite-based MSS laminates via the resin infusion method[29]
图 19 (a) ZnO纳米棒修饰WCF的表面微观形貌;((b)~(f)) 在0.18 mol/L KOH水溶液刻蚀2 h、4 h、5 h、5.5 h、6 h得到的ZnO纳米管修饰WCF的微观形貌[34]
Figure 19. (a) Surface micromorphology of ZnO nanorods/WCF; ((b)-(f)) Surface micromorphology of ZnO nanotubes/WCF obtained by etching in 0.18 mol/L KOH aqueous solution for different time (2 h, 4 h, 5 h, 5.5 h and 6 h)[34]
表 1 未改性碳纤维与活化改性碳纤维的比表面积与拉伸强度[22]
Table 1. Specific surface area and tensile strength of as-received and activated carbon fibre[22]
Sample Specific surface
area/
(m2·g-1)Tensile strength/
MPaAs-received 0.21 3300±200 HNO3 activated 0.50 3100±260 Air activated 0.60 1900±220 CO2 activated 1.10 2400±250 KOH activated 23.30 3600±320 表 2 不同改性碳纤维电极的比表面积与比电容[17]
Table 2. Surface area and specific capacitance of carbon fiber electrodes by different modification[17]
Sample CAG loading/wt% BET surface area/(m2·g−1) Specific capacitance/
(F·g−1)As-received – 0.21 0.06 CAG-modified
(press)22.0 163.10 14.30 CAG-modified
(infusion)15.9 118.00 8.70 CAG-modified
(infusion)9.5 80.70 5.90 Notes: CAG—Carbon aerogels; BET—Brunauer-Emmett-Teller. 表 3 不同改性碳纤维电极的性能对比
Table 3. Performance comparison of different modified carbon fiber electrodes
电极材料 电解质 比电容 力学性能 文献 ACF PC/PEGDGE/TBAPF6 3.1 F/g (SSC) 器件压缩强度:28.81 MPa;
器件压缩模量:35.08 MPa[24] WCF/AC15 DGEBA/AG-85/EMIMTFSI 13.12 F/g (SSC) 器件拉伸强度:257.78 MPa;
器件拉伸模量:23.20 MPa[18] GNP-WCF TEABF4/PC 1.44 F/g (小尺寸SSC) 器件拉伸强度:350 MPa;
器件拉伸模量:26 GPa[27] 623 mF/g (大尺寸SSC) CNT-CF 1 mol/L KCl 3.1 F/g (电极) – [30] CD553/SR494/EMITSFI 125 mF/g (SSC) – ZnO-WCF LSP-8020 B/EMITSFI/LiTf/PANI 18.8 F/g (SSC) 器件拉伸强度:325.82 MPa; [34] Cu-CoSe NWs@WCF LPS-8020 B/EMIMBF4/LiTf 28.63 F/g (SSC) 器件拉伸强度:488.89 MPa;
器件拉伸模量:32.65 GPa[10] CF/VG/MnO2 1 mol/L Na2SO4 240 F/g (电极 ) – [12] PEGDGE/EMITSFI/LiTFSI) 30.7 mF/cm2 (SSC) 器件拉伸强度:85.6 MPa CF/PANI LiClO4/DGEBA/PC 20.05 mF/g (SSC) – [42] Notes: PEGDGE—Poly(ethylene glycol) diglycidyl ether; TBAPF6—Tetra-n-butylammonium hexafluorophosphate; DGEBA—Digycidylether of bis-phenol-A; EMIMTFSI—1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide; TEABF4—Tetraethylammonium tetrafluoroborate; LiTf—Lithium trifluoromethanesulfonate; EMIMBF4—1-ethyl-3-methylimidazolium tetrafluoroborate; LiTFSI—Lithium bis((trifluoromethyl)sulfonyl)azanide. -
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