Abstract: Graphene/layered double hydroxides (Gr/LDH) nanocomposites have recently became one of the eye-catching material in the field of energy storage material science because of its superior properties such as large specific surface areas,high power density,stable mechanical properties and the adjustability of its composition.The properties and preparation methods of Gr/LDH were primarily summarized.Research progress of Gr/LDH in application of supercapacitor was reviewed.The widely used preparation methods of Gr/LDH were hydrothermal synthesis,co-precipitation synthesis,exfoliation-restacking synthesis,the self-assembly synthesis and so on.According to improving the preparation methods,micro morphological characteristics of Gr/LDH can be optimized and showed a wide range of application in the supercapacitor electrode materials.
 Lee S H,Lee D H,Lee W J,et al.Tailored assembly of carbon nanotubes and graphene[J].Advanced Functional Materials,2011,21(8):1338-1354.  Huang Z,Wang S,Wang J,et al.Exfoliation-restacking synthesis of CoAl-layered double hydroxide nanosheets/reduced graphene oxide composite for high performance supercapacitors[J].Electrochim Acta,2015,152(2):117-125.  Peng W J,Li H Q,Liu Y Y,et al.Effect of oxidation degree of graphene oxide on the electro-chemical performance of CoAl-layered double hydroxide/graphene composites[J].Applied Materials Today,2017,7(8):201-211.  Jia Y,Zhang L Z,Gao G P,et al.A heterostructure coupling of exfoliated Ni-Fe hydroxide nanosheet and defective graphene as a bifunctional electrocatalyst for overall water splitting[J].Advanced Materials,2017,29(17):1-8.  Samuei S,Fakkar J,Rezvani Z,et al.Synthesis and characterization of graphene quantum dots/CoNiAl layered double-hydroxide nanocomposite:application as a glucose sensor[J].Analytical Biochemistry,2017,521(3):31-39.  Abellan G,Martí-Gastaldo C,Ribera A,et al.Hybrid materials based on magnetic layered double hydroxides:a molecular perspective[J].Acc Chem Res,2015,48(6):1601-1611.  Berner S,Araya P,Govan J,et al.Cu/Al and Cu/Cr based layered double hydroxide nanoparticles as adsorption materials for water treatment[J].Journal of Industrial and Engineering Chemistry,2018,59(3)134-140.  Zhu J Y,Zhu J L,Zhang H,et al.Calcined layered double hydroxides/reduced graphene oxide composites with improved photocatalytic degradation of paracetamol and efficient oxidation-adsorption of As(Ⅲ)[J].Applied Catalysis B:Environmental,2018,225(6):550-562.  Daud M M,Kamal M S,Shehzad F,et al.Graphene/layered double hydroxides nanocomposites:a review of recent progress in synthesis and applications[J].Carbon,2016,104(8):241-252.  Li M,Cheng P,Wang J,et al.The growth of nickel-manganese and cobalt-manganese layered double hydroxides on reduced graphene oxide for supercapacitor[J].Electrochimica Acta,2016,206(20):108-115.  Sarfraz M,Shakir I.Recent advances in layered double hydroxides as electrode materials for high-performance electrochemical energy storage devices[J].Journal of Energy Storage,2017,13(10):103-122.  Tiruneh S N,Kang S N,Ngoc Q T,et al.Enhanced electrochemical performance of lamellar structured CoNi(OH)2/reduced graphene oxide(rGO) via hydrothermal synthesis[J].RSC Advance,2016,53(6):4764-4769.  Huang L,Liu B C,Hou H J,et al.Facile preparation of flower-like NiMn layered double hydroxide/reduced graphene oxide microsphere composite for high-performance asymmetric supercapacitors[J].Journal of Alloys and Compounds,2018,730(1):71-80.  Huang Z C,Wang S L,Wang J P,et al.Exfoliation-restacking synthesis of CoAl-layered double hydroxide nanosheets/reduced graphene oxide composite for high performance supercapacitors[J].Electrochimica Acta,2015,152(2):117-125.  Zhong Y Y,Liao Y Q,Gao A M,et al.Supercapacitive behavior of electrostatic self-assembly reduced graphene oxide/CoAl-layered double hydroxides nanocomposites[J].Journal of Alloys and Compounds,2016,669(16):146-155.  Padmini M,Kiran S K,Narayanan L,et al.High-performance solid-state hybrid energy-storage device consisting of reduced graphene-oxide anchored with NiMn-layered double hydroxide[J].Electrochimica Acta,2017,236(14):359-370.  Kim Y,Cho E S,Park S J,et al.One-pot microwave-assisted synthesis of reduced graphene oxide/nickel cobalt double hydroxide composites and their electrochemical behavior[J].Journal of Industrial and Engineering Chemistry,2016,33(1):108-114.  Qu J,He X M,Chen M,et al.A facile mechanochemical approach to synthesize Zn-Al layered double hydroxide[J].Journal of Solid State Chemistry,2017,250(6):1-5.  Wang W C,Zhang N,Shi Z Y,et al.Preparation of Ni-Al layered double hydroxide hollow microspheres for supercapacitor electrode[J].Chemical Engineering Journal,2018,338(8):55-61.  Du M,Yin X S,Tang C H,et al.Takovite-derived 2-D Ni/Al double hydroxide monolayer and graphene hybrid electrodes for electrochemical energy storage applications with high volumetric capacitance[J].Electrochimica Acta,2016,190(4):521-530.  Gao L B,Zhang H T,James U S,et al.Mechanically stable ternary heterogeneous electrodes for energy storage and conversion[J].Nanoscale,2018,10(5):2613-2622.  Xu J M,Liao K,Song K X,et al.Fast in situ synthesis of CoFe layered double hydroxide onto multi-layer graphene for electrochemical capacitors[J].Journal of Solid State Electrochemistry,2018,262(6):181-185.  Xiao Y H,Su D C,Wang X Z,et al.Ultrahigh energy density and stable supercapacitor with 2D NiCoAl layered double hydroxide[J].Electrochimica Acta,2017,253(31):324-332.  Bai X,Liu Q,Liu J Y,et al.All-solid state asymmetric supercapacitor based on NiCoAl layered double hydroxide nanopetals on robust 3D graphene and modified mesoporous carbon[J].Chemical Engineering Journal,2017,328(22):873-883.  Hao X Q,Jiang Z Q,Tian X N,et al.Facile assembly of Co-Ni layered double hydroxide nanoflakes on carbon nitride coated N-doped graphene hollow spheres with high electrochemical capacitive performance[J].Electrochimica Acta,2017,253(31):21-30.  Hatui G,Nayak G C,Udayabhanu G.One pot solvothermal synthesis of sandwich-like Mg-Al layered double hydroxide anchored reduced graphene oxide:An excellent electrode material for supercapacitor[J].Electrochimica Acta,2016,219(33):214-226.  Zheng C H,Yao T,Xu T R,et al.Growth of ultrathin NiCoAl layered double hydroxide on reduced graphene oxide and supercapacitive performance of the resulting composite[J].Journal of Alloys and Compounds,2016,(678):93-101.  Lee I,Gyoung H J,Soyeon A,et al.Facile synthesis of 3D MnNi-layered double hydroxides (LDH)/graphene composites from directly graphites for pseudocapacitor and their electrochemical analysis[J].Applied Surface Science,2018,429(3):196-202.  Du Q H,Su L,Hou L Y,et al.Rationally designed ultrathin Ni-Al layered double hydroxide and graphene heterostructure for high-performance asymmetric Supercapacitor[J].Journal of Alloys and Compounds,2018,740(11):1051-1059.  Chu X Y,Deng T,Zhang W,et al.Architecture of Co-layered double hydroxide nanocages/graphene composite electrode with high electrochemical performance for supercapacitor[J].Journal of Energy Chemistry,2018,27(2):507-512.  Shahrokhian S,Rahimi S,Mohammadi R.Nickel-cobalt layered double hydroxide ultrathin nanosheets coated on reduced graphene oxide nonosheets/nickel foam for high performance asymmetric supercapacitors[J].International Journal of Hydrogen Energy,2018,43(4):2256-2267.