The rapid development of EV industry, the high rate of lithium-ion batteries is the key to its development, the need for constant development of high rate charge and discharge battery materials. In this paper, the research progress of anode materials, anode materials, separators and electrolytes for high rate Li-ion batteries is reviewed. The development of high rate Li-ion battery materials is prospected.

The chemical power source, or battery, which serves as an energy-carrying device or system, plays a very important role in the development and utilization of new energy resources, either in field of transforming chemical energy stored in materials into electrical energy, or storing the excess electricity as the chemical energy. In this paper, the principle, performance, application as well as history of 12 different types of chemical power sources are reviewed, and the future development directions of these chemical power sources are also prospected based on the current demands of China's mobile power supply and large-scale grid energy storage.

Lithium-ion battery, which has a great successful application in the portable electronics, is believed the most promising power source for electric vehicles and wearable devices. Moreover, it also has a great potential in application of mass energy storage. As the anode material of lithium-ion battery, spinel lithium titanate (Li₄Ti₅O₁₂) has been intensively studied as a promising alternative to graphite, given to its high potential during charging and discharging, excellent cycling stability, and high thermal stability and safety, which are associated with its zero-strain character. In this review, the structure and performance of Li₄Ti₅O₁₂ were introduced briefly. The mechanism of lithium inserting, synthetic and modification methods for Li₄Ti₅O₁₂as anode material for Lithium-ion battery were reviewed, and the effect of synthetic and modification methods on electrochemical performance such as charge and discharge capability, cycle performance of Li₄Ti₅O₁₂was analyzed. The influencing factors and possible mechanism for gassing behavior in battery working process and the suppressing methods are briefly described. Moreover, suggestions on the prospect of the application of electric vehicles (EVs) in China are also put forward in this review.

With the adjusting of Chinese energy structure, the scale of renewable energy such as wind power and photovoltaic is growing rapidly. The scale of new energy vehicles is growing simultaneously, both of which are challenging the traditional energy system. Energy storage technologies can solve these problems, but energy storage industry in China is far from mature. This article overviews the basic situations of energy storage technologies, analyzes the applications and policies of energy storage, finally offer policy support suggestions for Chinese energy storage industry.

Independent microgrid with renewable energy is a suitable and sustainable solution to provide electricity power in areas without electricity. Nowadays microgrid with strong theory still has difficulties to be spread because of the poor operability. In order to solve the barrier of the current microgrid project, this paper proposed a simplified design of an independent hydropower-photovoltaic energy storage microgrid system. According micro sources and load characteristics of the project location, calculating the system power demand is required to get the configuration capacity of photovoltaic、hydropower and other power sources. For maximum the reliability of power system supply, this paper brings forward two key appraisal indicator of the system:the power system shortage rate and energy leakage ratio in order to reasonably coordinate each output of power sources in microgrid system to meet the load requirements in each time period and to ensure the real-time power balance between the load requirements and the output of each power source module in the microgrid. The configuration capacity of the battery storage system in the microgrid system can be calculated based on these two indicators. This article summarizes a set of general design methods for microgrid which provides convenience for engineering designers that engaged in microgrid field.

Lead-acid battery utilized secondary is conform to the characteristics of green industry, effective resource utilization. Secondary utilized lead-acid battery used in mini PV system make the integration of new energy and energy storage technologies better, realize the utilization of resources. It is the practical application of the series standard of "Secondary utilized lead-acid batteries". The research results are used for sewage treatment in rural areas, can effectively integrate resources, excavate the residual capacity of batteries deeply, promote the transformation of scientific research results, realize resource recycling and protect the environment. The system has those characteristics of no power consumption, low cost, quick effect, high integration, easy operation, high flexibility, etc. It is very suitable for sewage treatment in rural areas. The effect of water treatment is stable. The indexes of COD and NH₃-N in water can be effectively controlled which has good application prospect.

This paper researched on the temperature field characteristics of LiFePO₄ power battery used in electric vehicles (EV) at various discharge ratio, by ANSYS software based on emulated calculation and finite element method. The results showed that the highest temperature of the batteries were 34.3629℃ for 1C, 53.7926℃ for 2C, 83.3099℃ for 3C, respectively. Water-cooling was the best way to cool the battery. This paper provided basis for the design and temperature field test of battery.

Nitrate molten salts have earned a lot of fame in concentrating solar power plants due to its better thermophysical properties. Thermal storage capacity of a molten salt can be improved by increasing its specific heat capacity. This study investigate the influence on the specific heat capacity by adding alumina nanoparticles and carbon nanotubes to the eutectic mixture of lithium nitrate, potassium nitrate and sodium nitrate by percentage ratios of 52:30:18. Alumina and CNTs were added with concentration of 0.06%, 0.5%, 1%, 2% for each. Molten salt based nanofluid was developed by using direct synthesis method i-e nanoparticles were added in the salts mixture followed by ultra-sonication and evaporation. The microstructures were observed using scanning electron microscope (SEM) to reveal the dispersion of the nanoparticles. SEM analysis shows that as the concentration of nanoparticles increases it starts to agglomerates and form clusters. This type of agglomeration affects the specific heat capacity of nanofluid. Specific heat capacity was measured using the differential scanning calorimeter (DSC). The DSC results of alumina based nanofluid shows the 1.44 times enhancement of specific heat capacity at solid state (110℃) and 3.48 times at liquid state (140℃). Similarly, for CNTs there is 5.07 times enhancement of specific heat capacity at solid state (110℃) and 4.17 times at liquid state (140℃). These DSC results are shown at 1% concentration of nanoparticles after this concentration the C_p for the nanofluid decreased. This research discussed the mechanisms involved in enhancement of specific heat capacity of nanofluid. It is concluded that high specific energies related with the high specific surface area of the nanoparticles can be responsible for the observed enhancement in the specific heat capacity.

With the development of people's high requirement of energy storage devices, the development of secondary batteries with high energy density has attracted wide attention. The high theoretical capacity and low electrochemical potential of the Li electrode make it an ideal anode for high-energy-density batteries. However, significant challenges including dendrite growth and low Columbic efficiency still hinder the practical applications of rechargeable lithium metal batteries. The formation and growth of Li dendrites during charging process (Li depositing on anode side) and the low Columbic efficiency resulted from the high reactivity of lithium metal with the electrolyte solvents and salt anions. The continuous growth of Li dendrites is undesirable because it may penetrate the polymer separator and cause internal short circuit, leading to cell failure and safety issues such as fire and even explosion. Since the 1990s, with the development of observation and testing technology, researchers' attention has extended to the in-suit growth of lithium dendrites. What's more, it also provided an effective way for the regulation of lithium dendrites. Through the physical characterization of lithium batteries, the growth mechanism and influencing factors were obtained via exploring the growth behavior of lithium dendrite, which is helpful to propose new methods to improve the safety, utilization and cycle life of lithium anode. In this paper, the research progress of physical observation of metallic lithium electrode is reviewed, the state-of-the-art physical representation methods are summarized and its further development are predicted.

Based on the rapid rise of lithium industry, the market demand of lithium ion battery electrolyte is expanding, and the traditional electrolyte production process can not meet the existing development needs. It is particularly important to seek new ways to optimize the process and combine traditional production technology to further improve the production capacity and quality of the electrolyte. On how to improve production efficiency, shorten production cycle and reduce energy consumption, further analysis and discussion are made on the basis of experience and experimental results in practical application.

To meet the demand of solar thermal power generation system working at high efficiency, this paper studies the charge and discharge performance of a new mixed molten salt (NaNO₃:KNO₃:LiNO₃=2:3:5). The Fluent simulation results indicate that the final melted zone is located at the corner of the bottom of the tank. In order to prevent melted dead spots in this area during engineering applications, a melting device should be added. The simulation results were verified by charge and discharge experiments. The experimental results show that the molten salt in the tank gradually melts from top to bottom during the heating process, and the molten salt always has temperature stratification. But the process of cooling solidification has no stratification.

With the improvement of automation degree of power station and substation, it is very important to provide DC power system for communication, dispatch, control and lighting of substation and substation. DC system provides important power guarantee for power control and operation, and is the basic guarantee for power system control and protection. If the DC power supply system is unreliable power loss, it will lead to the substation all communication, dispatch, control, protection, lighting in a state of paralysis, can not guarantee the safe and stable operation of the substation, in the substation substation power supply accident blackout, the whole power station loses controllability and protection, it is very easy to cause power grid accidents, power supply. Safe and stable operation of network brings potential risks. DC power supply is the heart of substation, battery is the last barrier of power supply, the current state grid company has no production capacity of lithium iron phosphate battery.

Phase change materials have high efficiency in energy storage. The phase change material and the building material matrix are combined to form a kind of heat storage enclosure structure. This enclosure structure can play the function of phase change heat storage, reduce the fluctuation of indoor temperature, enhance the thermal comfort of the building, and reduce the energy consumption of the building operation more effectively, thus realizing the building energy saving.In this paper,the advantages and disadvantages of current existing phase change energy storage materials,the application of phase change materials in different enclosure structures,the influence of phase change energy storage enclosure on indoor thermal environment and its influence on energy consumption of building operation,the economy of phase change energy storage enclosure's application and so on were analyzed,the disadvantages and prospects for development of phase change energy storage enclosure in engineering application are presented.

Tube heat exchangers are widely used in the field of phase change heat storage because of their firm structure, large heat transfer area and strong adaptability to the use of materials. However, due to the low thermal conductivity of most phase change materials, the heat transfer performance of the heat exchanger is poor, so improving the heat storage efficiency of the phase change heat storage is a hot spot at home and abroad. In this paper, the two-dimensional unsteady simulation optimization was conducted to study the influences of the shape of the heat exchanger structure, the number of fins and the center distance on the thermal storage performance. And the change trend of temperature and liquid phase ratio of phase change materials during melting process is explored. The results show that the heat storage performance of square heat exchanger is better than that of the circular heat exchanger. Compared with the heat storage heat exchanger without fins, the heat storage performance of the heat storage heat exchanger is improved significantly, and the melting time of phase change material is shortened by 66%. Within a certain range, the pressure drop increases as the center distance decreases, but the heat storage performance increases accordingly.

The container type energy storage system as a new form of engineering, can greatly save time limit for a project, which compared with the traditional way of site construction. Reliable thermal design, is the foundation that the battery system is reliable and safe operation. Based on the finite element analysis software, the different thermal design scheme selection is analyzed, and the reliability of the thermal design is validate, in view of the complex lithium battery energy storage system.

The electric heat storage technology is a new technology to adapt to the environmental protection demand of coal-to-electricity project and the development trend of clean heating. The heat storage materials at various temperature levels exist, how to select and prepare materials according to the demand, and then design the system structure of the electric energy storage system becomes the key research content. In this paper, through the study of thermal performance characteristics, a heat storage material temperature system is analyzed and proposed. Based on the application characteristics of high temperature heat storage materials, a design method of resistive heat storage system using special magnesia brick was proposed and its characteristics were analyzed.

The recycling of lithium-ion power batteries is one of the focuses of the current energy storage industry. To understand the recycling status of lithium battery, We comprehensively analyzes the lithium-ion power battery recycling technology from application trend, global distribution areas, major domestic and foreign applicants, global and domestic key technologies and other issues. The results show that although the lithium-ion power battery recycling technology is currently the target of the global competition, especially in China, the patent applications of all enterprises are small and the technical layout is scattered. Overall, the lithium-ion battery recycling technology is still feeling its way. At the stage, the industry outlook is unknown. Therefore, it is expected to provide some reference for the future layout and development of lithium-ion power batteries recycling.

Microgrid is a new network structure. The system unit composed of micro power supply, load, energy storage system and control device can realize self-protection control and energy management autonomous system. It can be connected with external power grid or run in isolation. It can not only meet the power supply needs of users, but also meet the three requirements of cold, heat and electricity. The need for joint supply.