Facile Preparation and Lithium Storage Properties of TiO₂@Graphene Composite Electrodes with Low Carbon Content

Abstract

Over the past decade, TiO2 /graphene composites as electrodes for lithium ion batteries have attracted a great deal of attention for reasons of safety and environmental friendliness. However, most of the TiO2 /graphene electrodes have large graphene content (9-40 %), which is bound to increase the cost of the battery. Logically, reducing the amount of graphene is a necessary part to achieve a green battery. The synthesis of TiO2 nanosheets under solvothermal conditions without additives is now demonstrated. Through mechanical mixing TiO2 nanosheets with different amount of reduced graphene (rGO), a series of TiO2 @graphene composites was prepared with low graphene content (rGO content 1, 2, 3, and 5 wt %). When these composites were evaluated as anodes for lithium ion batteries, it was found that TiO2 +3 wt % rGO manifested excellent cycling stability and a high specific capacity (243.7 mAh g(-1) at 1 C; 1 C=167.5 mA g(-1) ), and demonstrated superior high-rate discharge/charge capability at 20 C.

Recent progress on Ag/TiO2 photocatalysts: photocatalytic and bactericidal behaviors

“…3. Modifying with graphene and its derivatives: graphene with its unique structure, high electron mobility, and attractive features prevents the charges recombination through the modification of the valence and conduction band levels (Guo and Zhen 2016;Tang et al 2018;Chakhtouna et al 2021). 4.…”

Hierarchical N‐Rich Carbon Sponge with Excellent Cycling Performance for Lithium‐Sulfur Battery at High Rates

“…Such channels facilitateL i + diffusiona nd accommodate www.chemeurj.org intermediate products to buffer volumee xpansiond uring discharge/charge processes. [34,35] From TEM observations (Figure 2b,c), it can be seen that the hierarchical structure consists of graphene-likel ayersw ith dense pores,a nd resembles a sponge. The elasticityo fs uch as ponge-like structure should be beneficial for immobilizing LiPSs.…”

“…The loose and porous nanosheets connect with each other and form channels. Such channels facilitate Li + diffusion and accommodate intermediate products to buffer volume expansion during discharge/charge processes . From TEM observations (Figure b,c), it can be seen that the hierarchical structure consists of graphene‐like layers with dense pores, and resembles a sponge.…”