Search

As high theoretical capacity and excellent electrical conductivity, Co9S8 as a promising electrode material in lithium-ion batteries (LIBs) has attracted wide attention. In the present work, a simple vaporpressured induced route is developed for fabricating spherical-like Co9S8/N, S-codoped carbon nanocomposites (Co9S8/NSC), in which Co9S8 nanoparticles with an average size of 100 nm are encapsulated into N, S-codoped carbon matrix, by pyrolysis of mixture of cobalt isooctanoate dissolved into dimethylformamide and thiourea in a sealed vessel for the first time. As anode for LIBs, the Co9S8/NSC shows an excellent reversible capacity, a superior rate performance, and a long cycling stability. For example, a high capacity of 975.3 mA h g-1 can be achieved after 100 cycles at 0.1 A g-1. When cycled at 1 A g-1, it also maintains a high specific capacity of 791.5 mA h g-1 after 1000 cycles. Besides, it also shows a superior rate performance (329.8 mAh g-1 at 20 A g-1). Such superior performances may arise from its structural advantages that the smaller Co9S8 nanoparticles encapsulated into N, S-codoped carbon could enhance active sites, electrical conductivity, and structural stability.

In recent years, major emergencies show new trends and characteristics. The reform of the national emergency management system has continued to deepen, and the demand for emergency power supply has continued to increase. Thus it is urgent for the power system company to improve the company’s emergency management system, the ability to deal with urgent, difficult, and difficult tasks. This article analyzes the situation facing the modernization of the company’s emergency system, and puts forward the overall ideas and key measures to support emergency management reform and capacity improvement with the principle of “integration, normalization, socialization”.1

In recent years, the energy revolution has become a key in city development and leading economy. This article analyzes the current situation of energy development and city. Firstly, this article analyzes four aspects of problem of coordinated development. Then, this article has classified the city into two major systems. Finally, the correlation between energy and city is analyzed. Not only energy acts as a breakthrough in city development, but also the evolution of urban spatial form affects energy supply patterns.

In recent years, the concepts and practices of smart cities and “Internet plus” smart energy have mushroomed, greatly promoting the development and application of customer-side energy Internet business and stimulating users’ diversified and personalized demand for interactive services of intelligent power utilization. Intelligent power utilization, as the core of the interactive service system, serves as a bridge between power supply departments and customers. Its construction has a direct impact on the efficiency, economic operation and orderly electricity consumption of power grids. In the context of the increasingly intelligent power grid and complex load structure, this paper analyzed the development trend of energy Internet and adopted SWOT to reveal the strengths, weaknesses, opportunities and challenges of power grid enterprises in developing energy Internet, explore their development ideas on energy Internet businesses, and facilitate their development of energy Internet.

This article builds a model of energy-city development correlation, and factors for energy systems to drive city development. It also analyzes the corresponding indicators and determines the intercorrelation between the indicators. In the end, the article collects and categorizes energy, industry, environment, and other representative indicators from prefecture-level cities in China, and analyzes the factors affecting energy and city development based on the panel data regression model.