Keyword search: battery plant ,  lithium battery factory ,  power bank works ,  lifepo4 battery mill ,  Pallet Trucks LiFePO4 Battery,  LiFePO4 Pallet Trucks Battery,  Lithium Pallet Trucks Battery, 

The first type is carbon negative electrode materials: Currently, most of the negative electrode materials used in lithium-ion batteries are carbon materials, such as artificial graphite, natural graphite, mesophase carbon microspheres, petroleum coke, carbon fiber, pyrolysis resin carbon, etc. The second type is tin based negative electrode materials: tin based negative electrode materials can be divided into two types: tin oxide and tin based composite oxide. Oxides refer to the oxides of various valence metal tin. There are currently no commercial products available. The third type is lithium containing transition metal nitride negative electrode materials, and there are currently no commercial products available. The fourth type is alloy based negative electrode materials, including tin based alloys, silicon based alloys, germanium based alloys, aluminum based alloys, antimony based alloys, magnesium based alloys, and other alloys, and there are currently no commercial products available. The fifth type is nanoscale negative electrode materials: carbon nanotubes, nano alloy materials. The sixth type of nanomaterial is nano oxide material: Currently, Hefei Xiangzheng Chemical Technology Co., Ltd. has started using nano titanium oxide and nano silicon oxide to add to traditional graphite, tin oxide, and nano carbon nanotubes based on the latest market development trends of the lithium battery new energy industry in 2009, greatly improving the charging and discharging capacity and frequency of lithium batteries.

The main components of lithium-ion batteries include electrolyte, isolation materials, positive and negative electrode materials, etc. The positive electrode material accounts for a large proportion (the mass ratio of positive and negative electrode materials is 3:1~4:1), because the performance of the positive electrode material directly affects the performance of lithium-ion batteries, and its cost directly determines the cost of the battery.

Lithium ion batteries are a secondary battery system that uses two different lithium intercalation compounds that can reversibly insert and remove lithium ions as the positive and negative electrodes, respectively. When charging, lithium ions detach from the lattice of the positive electrode material, pass through the electrolyte, and insert into the lattice of the negative electrode material, making the negative electrode rich in lithium and the positive electrode poor in lithium; During discharge, lithium ions detach from the lattice of the negative electrode material and are inserted into the lattice of the positive electrode material after passing through the electrolyte, resulting in lithium enrichment in the positive electrode and lithium depletion in the negative electrode. The difference in potential between the positive and negative electrode materials when inserting and removing lithium ions relative to metallic lithium is the working voltage of the battery.

Lithium ion batteries are a new generation of green high-energy batteries with excellent performance, and have become one of the focuses of high-tech development. Lithium ion batteries have the following characteristics: high voltage, high capacity, low consumption, no memory effect, pollution-free, small size, low internal resistance, less self discharge, and multiple cycles. Due to its above characteristics, lithium-ion batteries have been applied in many civilian and special fields such as mobile phones, laptops, cameras, digital cameras, etc.

The use of microwave drying technology to dry lithium battery cathode materials has solved the problems of long drying time, slow capital turnover, uneven drying, and insufficient drying depth in conventional lithium battery cathode material drying technology

The specific features include:

1. Using microwave drying equipment for lithium battery cathode materials, it is fast and fast, and can complete deep drying in a few minutes, which can make the final water content reach over one thousandth

2. The positive electrode material of lithium batteries is dried uniformly by microwave, and the product has good drying quality.

3. Using microwave dried lithium battery cathode materials, it is efficient, energy-saving, safe and environmentally friendly.

4. The positive electrode material of the battery is dried by microwave, which has no thermal inertia and is easy to control in real-time heating. Microwave sintered lithium battery cathode materials have the characteristics of fast heating rate, high energy utilization rate, high heating efficiency, safety, hygiene, and pollution-free. They can also improve the uniformity and yield of products, and improve the microstructure and properties of sintered materials. Synotherm has a registered capital of 20.8 million yuan and is a globally renowned manufacturer of industrial microwave kiln equipment and provider of industrial microwave heating solutions

In recent years, policies related to lithium batteries have been gradually introduced, promoting the establishment of upstream and downstream enterprises in the industry like mushrooms after rain. Lithium batteries are mainly composed of positive electrode materials, negative electrode materials, separators, and electrolytes. Positive electrode materials account for more than 40% of the total cost of lithium batteries, and the performance of positive electrode materials directly affects the various performance indicators of lithium batteries. Therefore, lithium positive electrode materials occupy a core position in lithium batteries.

Currently, the lithium-ion battery cathode materials that have been commercialized include lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, and ternary materials.

With the rapid development of China's economy and the increasing demand for new battery materials, coupled with the strong demand for new, efficient, and environmentally friendly battery materials in products such as mobile phones, laptops, digital cameras, cameras, and automobiles, the market for new battery materials in China will continue to expand. Lithium batteries, as the future development direction of batteries, have a promising market for positive electrode materials. Meanwhile, the promotion of 3G mobile phones and the large-scale commercialization of new energy vehicles will bring new opportunities for lithium-ion battery cathode materials.

Although lithium battery cathode materials have a broad market, the prospects are very optimistic. However, there are still certain technological bottlenecks in the positive electrode materials of lithium batteries, especially their advantages of high capacitance and strong safety performance have not been fully utilized.

In fact, in the field of lithium-ion battery cathode materials, any small technological innovation may trigger a new round of market expansion. Chinese enterprises should strengthen the research and development of key technologies for cathode materials, gain an international leading position, enhance core competitiveness, and gain an advantage in international competition.

At present, the energy density of lithium batteries is low. Firstly, the energy density is low, the vehicle is heavier, and the space is also limited. It is necessary to discover new materials for batteries. Secondly, the battery life is poor. Those who claim to have a life of over 100 kilometers are considered ideal, while the actual road life is around 60 kilometers. In congested cities like Beijing, 60 kilometers is not enough. The third issue is poor safety, which is still controversial because the materials used to make batteries are unstable and indeed prone to explosions.

Lithium ion battery negative electrode materials grasp the safety lifeline of power batteries. In addition to a small market share of graphitized mesophase carbon microspheres (MCMB), amorphous carbon, silicon or tin, natural graphite and artificial graphite account for over 90% of the negative electrode material market share in lithium-ion battery negative electrode materials. In the 2011 negative electrode material market statistics, the global total production and application of negative electrode materials reached 32000 tons, an increase of 28% compared to the same period last year. Among them, natural graphite and artificial graphite negative electrode materials accounted for 89% of the market share. However, in recent years, due to the growth of electronic products, especially the increase in the application of lithium-ion batteries in the mobile phone and tablet fields, the production capacity of corresponding battery positive and negative electrode materials has rapidly increased. The growth rate of graphite negative electrode materials has reached over 25% for three consecutive years from 2009 to 2011.

In 2013, the global demand for diaphragms reached 563 million square meters, which is 1.41 times the market capacity in 2011, and the output value is about 1.7 billion US dollars. The domestic market demand for isolation membranes was approximately 128 million square meters in 2011. China's lithium battery products have accounted for about 30% of the global market share. The demand for domestic isolation film market is growing synchronously with the lithium battery market.

At present, 80% of the domestic use of isolation membranes relies on imports, and there is still a lot of room for demand for domestically produced isolation membranes. The proportion of domestically produced isolation membranes in the domestic market is expected to rapidly increase. In 2013, the share of domestically produced isolation membranes in the domestic market is expected to exceed 30%, and in 2015, it is expected to exceed 40%.

Overall, the development direction of lithium-ion battery cathode materials is lithium iron phosphate. Although the research and development of lithium iron phosphate cathode materials in China is in full swing, there is a lack of original innovative technology. There are two development directions for negative electrode materials in lithium-ion batteries in the future - lithium titanate materials and silicon-based materials. The silicon-based materials developed in China in recent years can basically meet the requirements of high specific capacity, high power characteristics, and long cycle life, but industrialization still needs to break through the constraints of process, cost, and environment. China has achieved certain results in the localization of lithium-ion battery separators, but there is still a long way to go to achieve large-scale production of high-end products. Lithium hexafluorophosphate has an absolute market advantage in lithium-ion battery electrolytes, but China is basically limited by Japanese technology and has weak independent research and development capabilities. [1]

Conductive coatings in battery materials

The use of functional coatings for surface treatment of battery conductive substrates is a groundbreaking technological innovation. Carbon coated aluminum foil/copper foil is the uniform and delicate coating of dispersed nano conductive graphite and carbon coated particles on aluminum foil/copper foil. It can provide excellent static conductivity, collect micro currents of active substances, greatly reduce the contact resistance between positive/negative electrode materials and current collectors, and improve the adhesion ability between the two. It can reduce the use of adhesives, thereby significantly improving the overall performance of the battery.

There are two types of coatings: water-based (water-based system) and oil-based (organic solvent system).

Performance advantages of conductive coating coated with carbon aluminum foil/copper foil

1. Significantly improve the consistency of battery pack usage and significantly reduce battery pack costs. For example:

·Significantly reduce the increase in dynamic internal resistance of battery cells;

·Improve the consistency of pressure difference in battery packs;

·Extend the lifespan of battery packs;

·Significantly reduce the cost of battery packs.

2. Improve the adhesion between the active material and the current collector, and reduce the manufacturing cost of the electrode. For example:

·Improve the adhesion of positive electrode materials and collector electrodes using water-based systems;

·Improve the adhesion between nano or submicron level cathode materials and collector electrodes;

·Improve the adhesion between lithium titanate or other high-capacity negative electrode materials and collectors;

·Improve the qualification rate of electrode fabrication and reduce the cost of electrode fabrication.

Adhesion test diagram of battery electrode coated with carbon aluminum foil and light foil

After using carbon coated aluminum foil, the adhesion force of the electrode was increased from 10GF to 60GF (using 3M tape or a hundred grid knife method), and the adhesion force was significantly improved.

3. Reduce polarization, increase magnification and capacity, and improve battery performance. For example:

·Partially reduce the proportion of adhesive in the active material and increase the gram capacity;

·Improve the electrical contact between the active substance and the current collector;

·Reduce polarization and improve power performance.

Performance chart of battery rate with different aluminum foils

Among them, C-AL is carbon coated aluminum foil, E-AL is etched aluminum foil, U-AL is a light aluminum foil

4. Protect the current collector and extend the service life of the battery. For example:

·Prevent corrosion and oxidation of the collector;

·Improve the surface tension of the collector and enhance its easy coating performance;

·It can replace expensive etched foil or replace the original standard foil with thinner foil.

Cycle curves of batteries with different aluminum foils (200 cycles)

Among them, (1) is aluminum foil, (2) is etched aluminum foil, and (3) is carbon coated aluminum foil

Research on Negative Electrode Materials for Lithium Batteries

As the negative electrode material for lithium secondary batteries, metallic lithium is first used, followed by alloys. However, they cannot solve the safety performance of lithium-ion batteries, which gave rise to lithium-ion batteries with carbon materials as the negative electrode.

The negative electrode material of polymer lithium-ion batteries is basically the same as that of lithium-ion batteries. From the development process of polymer lithium-ion batteries mentioned earlier, it can be seen that since the commercialization of lithium-ion batteries, there have been several types of negative electrode materials studied, including graphitized carbon materials, amorphous carbon materials, nitrides, silicon-based materials, tin based materials, new alloys, and other materials. This chapter mainly discusses practical negative electrode materials, namely graphitized carbon materials, while research on other negative electrode materials is being discussed.

For practical application of negative electrode materials, there are many factors to consider, including not only reversible capacity, irreversible capacity, and cycling performance, but also the adhesion (i.e. coating) between the negative electrode material and the current collector, the compaction density, volume capacity density, mass capacity density of the negative electrode plate, etc. These latter factors are often overlooked by researchers engaged in negative electrode material research. Of course, the conductivity and specific surface area of negative electrode materials also need to be considered.

Lithium Batteries ,Ensure Quality

Our lithium battery production line has a complete and scientific quality management system

Ensure the product quality of lithium batteries

Years of experience in producing lithium batteries

Focus on the production of lithium batteries

WE PROMISE TO MAKE EVERY LITHIUM BATTERY WELL

We have a comprehensive explanation of lithium batteries

QUALIFICATION CERTIFICATE

THE QUALITY OF COMPLIANCE PROVIDES GUARANTEE FOR CUSTOMERS

MULTIPLE QUALIFICATION CERTIFICATES TO ENSURE STABLE PRODUCT QUALITY

Providing customers with professional and assured products is the guarantee of our continuous progress.

Applicable brands of our products