Reconstructing titanic acid charging lithium battery ‘How fast, provincial, save the future

Reconstructing titanic acid charging lithium battery 'How fast, provincial, save the future

Zhangbei Fengguang storage demonstration project located in Zhangjiakou, Hebei, went into the national style storage demonstration power station in Zhangbei County, and can see a tall white wind turbine and sparkling blue on a green grassland. Color photovoltaic plate. Here is the largest wind-pricing demonstration project in my country, using the world’s first scenery of the scenery and technology route, which is a new energy comprehensive demonstration project of collective electricity, photovoltaic, energy storage device and intelligent transmission “four integration”.

. This power station can “store” difficult to predict, difficult control, difficult to schedule “, and translate into high-quality reliable green power input grid, and can run in” smooth fluctuations “and” peaks ” Flexible switches between patterns, in the absence of external grid power supply, the energy storage power station can keep the power grid normal operation through internal startup ability..

Development of energy storage technology is one of the key core technologies that promote new energy power generations and improve power grid safety stability. In various types of electrochemical energy storage technology, the lithium titanate ion battery has the characteristics of long cycle life, good safety performance. It is good to fit the application scenario of grid energy storage, but the high cost of the lithium titanate ion battery is Not conducive to scale storage.

In this regard, my country’s Electric Power Science Research Institute jointly established “the development and application technology development and application of low-cost titanate, lithium-ion batteries in the energy storage” project group. After years of research, the project team proposed a titanate-based ion battery system and production process reconstruction principles and technical methods for energy storage applications on the basis of the original titanate-free ion battery, and developed as assessed. Micrometer titanate.

The energy storage of the project has maintained a long life characteristic characteristic with a lithium-acid-based ion battery, and the cost is greatly reduced.. In the 2017 Beijing Science and Technology Awards, the project won the second prize.

The new energy of the new energy is considered to be the new energy of the new energy.. As a forward-looking technology that promotes the development of new energy industries, the energy storage industry will play a huge use in new energy grids, new energy vehicles, smart grids, microgrid, distributed energy systems, home energy storage systems.

. “The reason for developing energy is because photovoltaic and wind power generation are intermittent, unstable, so the cooperation of energy storage systems can supply stable and reliable electricity..

“Yang Kai, director of my country Electric Power Research Institute Body Research Office, told reporters. With large-scale energy storage technology, it can promote the development of renewable energy, improve the security and stability of grid, improve power supply, and effectively relieve the use of electricity supply and demand. The large-scale energy storage system runs through all aspects of electricity system, losing, distribution, and its application can improve the performance of the traditional power system, and will bring revolutionaryness to the grid planning, design, layout, operation management and use.

Changes, in this sense, energy storage technology is a technical highlight of national strategic significance, and the development of energy storage technology is actually “storage future”. A “wonderful” in the lithium-ion battery is understood that the energy storage technology is important to mechanical energy storage, electrochemical energy storage, electromagnetic energy storage and phase change storage..

In recent years, electrochemical energy storage technology represented by lithium-ion batteries has the characteristics of energy scale, flexibility, fast response speed, etc., in line with the technical needs of power system and the development trend of intelligent grid, and is subject to research institutions. Become the fastest power system energy storage technology.

Lithium-ion battery is a “rocking chair battery”, and the positive and negative is composed of two compounds or single tabs that canolize multiple deinterlaxing.. When charging, the positive electrode material is degraded, and the lithium ion enters the electrolyte through the diaphragm to embed the negative electrode, the positive electrode is oxidized, and the discharge is reverse.

Lithium-ion battery technology has been in a rapid development of the study of battery electrode materials. At present, the lithium-ion battery has been expanded from the lithium-cobalt-containing ion battery to a variety of battery systems such as lithium manganate, lithium iron titanate..

A new lithium ion battery with lithium titanate as an negative electrode, breaks through the inherent limitations of graphite as the negative electrode, which is superior to the traditional lithium ion battery, and is one of the most applicable prospects.. To this end, Yang Kai introduced the four advantages of the titanate and ion battery to stand out: good safety and stability.

Since the lithium titanate negative electrode material is high, the production and precipitation of metal lithium during charging, and due to its balanced potential above the reduction potential of the most of the electrolyte solvent, the electrolyte reaction is not formed, – Liquid interface passivation film to prevent many side reactions, thereby greatly improve safety. “The storage power station and electric cars are the most important indicators..

Yang Kai said. Fast charge performance is excellent. Too long-term charging time has always been an obstacle that is difficult to cross in the development of electric vehicles.

. Generally, a slow charging pure electric bus is generally used, and the charging time is at least 4 hours. Many pure electric passenger cars are charged for 8 hours.

. The lithium titanate ion battery can be full, and the traditional battery has a qualitative leap..

Long cycle life. Compared with the conventional lithium-ion battery, the lithium titanate material is almost contracted or expanded during the charge and discharge, referred to as “zero strain” material, which is called “zero strain” material. The problem of damage to the electrode structure caused by the cell bulk strain at the time of lithium ion, thereby having very excellent cycle performance.

According to the experimental data, the circulatory life of the lithium iron phosphate ion battery is 4000-6000 times, while the cycle life of the titanate ion battery can be more than 25,000 times.. Well-wide temperature performance.

Generally, the electric vehicle will occur when the electric vehicle is charged at -10 ¡ã C, and the low temperature resistance of the lithium titanate is good, the durability is strong, and it can be charged in -40 ¡ã C to 70 ¡ã C. Whether it is in a frozen North country In the hot south, the vehicles will not affect the work due to battery “shock”, eliminating the worries of users..

It is based on the above advantages, the lithium-acid ion battery has become a dazzling “wonderful” development process of lithium-ion battery technology.. Technical Reconstruction Reduction Cost Initial Titanate Ion Battery is developed to meet the demand for electric vehicle power lithium battery, although the internationally advanced titanate ion battery company has begun to participate in the field of electricity storage, but has not been specifically Lithium-ion battery development of scale energy storage applications.

“The important problem facing the lithium titanate ion battery in size applications is cost problem. At the beginning of the project research and development, the price is 4-6 times the price of lithium iron phosphate ion batteries..

“Yang Kai said that the price of the lithium titanate ion battery is high, although the performance is significantly better than the existing lithium-ion battery, the economic factor is greatly limited to the market promotion of lithium titanate ion batteries.. Therefore, the lithium titanate ion battery should achieve a large-scale energy storage application, and the technical reconstruction is carried out on the basis of the existing electric vehicle, including the technical system, battery design, production process, etc.

Constitation, while ensuring the lithium-lithium-lithium battery long life characteristics, significantly reduces costs. “We are not flat-up, but the electric vehicle is based on the titanate ion battery technology of electric vehicles to meet the energy storage application requirements, and the electric vehicle is technically reconstructed..

Yang Kai said. Any technology is impossible, as long as the balance between the technical indicators. “The energy storage battery is not too high, and the discharge magnification is only 5C.

“. “Yang Kai said,” The energy storage battery is usually placed in the room, the temperature is relatively constant, and the requirements for temperature adaptability are not too high..

“” Abandon some performance, choose low cost, become the most important choice. “The project team has been incubated by the lithium-acid lithium-ion battery and found that the root cause of this battery cost is the material..

“Lithium titanate ion battery is nano material, material synthesis process and battery preparation process complex. “Due to the strong water absorption of nanomaterials, the production process must reduce environmental humidity, increase the dehumidification treatment of the plant, and add dry procedures, and the energy consumption is significantly added..

In this regard, the project team decided to work in the nanomaterials, they have been repeatedly tried, and finally replaced the lithium titanate material with low-cost sub-micron titanate, and based on the basis for the establishment of a lithium-acid ion battery material system for energy storage.. With experimentation, when the particle size of the material is 0.

8 microns, it can guarantee the characteristics of long life, and can reduce the harsh conditions for production process control, thereby reducing costs.. At the same time, a laminated soft packaging structure with advantages in performance, manufacturing process, and cost is also used.

. “0.8 micron is a balance value, and the particle size increases will affect battery life.

. Yang Kai said. This is a reconstruction of materials and battery structures to reduce battery cost.

On the other hand, it is technically refactored to the homogenate, pre-coated collective fluid, environmental control, battery production process, etc., reducing battery costs..

“In the homogenization of the electrode material, the conventional mixing process is first plus solvent, then dry, energy consumption is very high.. R & D teams change this process to high viscosity mixing process, reduce solvent usage.

Yang Kai said. In the electrode production link, the project team changed the imported pre-coating collector to autonomously developed pre-coated collector; on the battery production process, the coating front coated coating is canceled two Drying process. Environmental control links made in batteries, relaxing environmental humidity from 10% to 30%.

“Nanomaterial general humidity should be controlled below 10%, and lithium iron phosphate is 30%. We use submicron materials to make cells in a 30% humidity environment, and found that the battery life is almost unaffected..

“Yang Kai said,” After testing, the cycle life of the lithium titanate ion battery exceeds 16,000 times, the battery cost has dropped by 30%.. “It is understood that the related research results of the project have been applied in addition to the application in the” National Storage Demonstration Project “project.


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