As one of the most important components of new energy technology

energy storage plays an increasingly important role in today

s society and is the current research hotspot;accelerating the innovation and development of energy storage technology is the key to solve the future development of new energy industry in accordance with market demands.As a new type of energy storage device

supercapacitor has many advantages

such as large capacity

high power density

fast charging speed

long cycle life

wide temperature range

maintenance free

safety and environmental protection

etc.However

its low energy density lim

its its large-scale application

and it needs to be optimized and improved.At present

all kinds of transition metal oxides have been paid attention to because of their high specific capacitance.They are used as electrode materials in supercapacitors.By means of oxidation-reduction reaction to store and release a large amount of energy

the energy density can be greatly improved.All kinds of transition metal oxides

such as RuO

2

MnO

2

NiO etc

have their own advantages and disadvantages.In this paper

various preparation methods of different transition metal oxides are introduced

and a variety of solutions are proposed for their disadvantages

such as low conductivity and poor cycle stability.In addition

the electrochemical properties of some mixed transition metal oxides and their composites with various high conductivity carbon nanomaterials are also introduced

and the current research directions of transition metal oxides are summarized.