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Par battery to dell - Publié dans : Dell laptop battery
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Lundi 1 août 2011 1 01 /08 /Août /2011 03:56

Holiday streets, shops, the Digital Camera Battery square will be decorated,dell C1295 battery especially night scene of beautiful all have a digital camera, the family will take a couple of pictures of the fashion to keep the beauty of the night.

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Par battery to dell - Publié dans : Dell laptop battery
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Jeudi 28 juillet 2011 4 28 /07 /Juil /2011 04:27

Analysis charge capacity loss over the provisions of the so-called overcharge is more than the charge termination voltage (typically 4.2V) and continue charging process. In the case of overcharge the battery capacity will result in the attenuation, mainly the following factors: dell laptop battery ① the overcharge reaction of graphite anode; ② overcharge positive reaction; ③ electrolyte oxidation reaction when the overcharge.Dell Inspiron 3700 battery, Dell Precision M40 battery, Dell Precision M50 battery, dell Inspiron 700m battery, Battery overcharge, the lithium-ion deposited on the cathode surface is easy to restore: Li + + e → Li (s) deposition of lithium in the anode surface coated, blocked lithium-embedded. Lead to reduced efficiency and discharge capacity loss, for two reasons: ① recyclable lithium reduced; ② deposition of lithium metal reaction with the solvent or supporting electrolyte to form Li2CO3, LiF, or other products; ③ lithium anode and the diaphragm is usually formed in between, may increased cell membrane pore blocking resistance. Fast charging, the current density is too large, serious negative polarization, lithium deposition will be more apparent. Positive overcharge resulting electrochemical capacity loss was mainly due to an inert substance (such as Co3O4, Mn2O3, etc.) produced, undermining the balance of capacity between the electrodes, the capacity loss is irreversible.



→ (1-y) / 3 [Co3O4 + O2 (g)] + while the cathode material of lithium ion batteries in a sealed decomposition of oxygen in the absence of recombination reactions (such as generating H2O) and the decomposition of the electrolyte while the flammable gas accumulation, the consequences would be disastrous. Overcharge can lead to electrolyte oxidation, the oxidation rate of the cathode material surface area with the size of the collector material and the added conductive agent (carbon black, etc.) has a lot at the same time, the surface area of ​​carbon black type and size is affect electrolyte oxidation is an important factor, the greater the surface area, solvent oxidation at the surface more easily. When the pressure is higher than 4.5V, the electrolyte will be oxidized to insoluble (such as Li2Co3) and gas, these insolubles may plug the pores in the electrode which hinder the migration of lithium ions caused by the loss of capacity during cycling.

Decomposition of the electrolyte solvent and supporting electrolyte from the electrolyte composition, usually in a positive form insoluble decomposition products Li2Co3 and LiF, etc., by blocking the pores of the electrode and reduce the battery capacity, Dell Inspiron 3700 battery, electrolyte reduction of battery capacity and cycle life will have a negative impact , and because of the gas produced will restore the pressure within the battery, resulting in security issues. Electrolyte lithium in graphite and other carbon anode is not high on stability, easy reaction irreversible capacity. When the initial charge-discharge decomposition of the electrolyte will form a passive film on the electrode surface, the passive film can separate the electrolyte and the carbon cathode block the further decomposition of the electrolyte. In order to maintain the structural stability of the carbon anode. Under ideal conditions the reduction of the electrolyte limits the formation of the passive film stage, the process is stable when the cycle is no longer happening. Electrolyte salt reduction in the formation of passive film, is conducive to the stability of passive film, but the resulting reduction of insoluble resultant reduction of the solvent will have a negative impact, and restore the electrolyte salt, electrolyte concentration decreases, eventually leading to battery capacity loss (LiPF6 reduction generated LiF, LixPF5-x, PF3O and PF3), while the formation of passive film consumes lithium-ion, which results in polarization caused by an imbalance between the capacity of the battery capacity is lower than that. The type of carbon used in the process, the electrolyte composition and electrode or electrolyte additives are the factors that affect the loss of film-forming capacity. Electrolyte often contains oxygen, water and carbon dioxide and other substances. Small amounts of water on the graphite electrode, no impact, but the water content is too high will generate LiOH (s) and Li2O sediments, is not conducive to lithium-ion embedded, resulting in the irreversible capacity loss: H2O + e → OH-+1 / 2H222 OH-+ Li + → LiOH ( s) LiOH + Li + + e → Li2O (s) + solvent in the CO2 in the anode can be restored to generate CO and LiCO3 (s): 2CO2 +2 e +2 Li + → Li2CO3 + cause the battery to increased intraocular pressure, and Li2CO3 (s) so that the battery internal resistance increases affect the battery performance.

Self-discharge the battery self-discharge is not used in the state, the capacitance loss of natural phenomena. Lithium-ion battery capacity loss resulting from the discharge at the two situations: First, irreversible capacity loss; the second is the irreversible capacity loss. Irreversible capacity loss is a loss in charging capacity to restore, rather than irreversible capacity loss on the contrary, such as lithium manganese oxide cathode and the solvent effect will occur resulting micro-cell discharge resulting from the irreversible capacity loss. Self-discharge is affected by the cathode material, the battery manufacturing process, the nature of the electrolyte, Dell Precision M40 battery, temperature and time and other factors. Such as self-discharge rate primarily due to the oxidation rate of the solvent control, the solvent affects the stability of the storage life of the battery, if the negative electrode is fully charged state and positive self-discharge occurs, the cell contents, the amount of balance is upset, will result in a permanent capacity loss. Prolonged or frequent self-discharge, lithium may be deposited on the carbon, increasing the capacity imbalance between the two. Pistoia so that the self-discharge of the oxidation products block the pores on the electrode material, embedded, and prolapse of the lithium difficult and increases the resistance and discharge efficiency, Dell Inspiron 3700 battery, Dell Precision M40 battery, Dell Precision M50 battery, dell Inspiron 700m battery, leading to irreversible capacity loss.





Solar cells, also known as photovoltaic cells, is an effective absorption of solar radiation, and transformed into electrical energy of semiconductor devices. It can be as light detection devices alone, such as camera in use, mainly through the series and in parallel to obtain the required voltage and current as the power supply used. The appearance of solar cells as a thin card or a thin glass like look different from ordinary batteries, which itself can not store electricity, which did not generate electricity to light when, if you use it at night, it is necessary and battery with the use. ?

Overview of solar cell

Solar photovoltaic power generation, can be regarded as by far the most beautiful, oldest and most reliable power generation technology. Compared with solar power, it also involves semiconductor devices, neither moving parts nor the working fluid flow, therefore, to avoid the corrosion of mechanical maintenance and engineering issues of quality, renewable energy and sustainable development of reliable energy.



Silicon solar cell development began in 1954 in the United States Institute of Bell successful trial, the following year will be used as telecommunications equipment supply, 1958 has been the first application of the United States and in the "Pioneer 1" satellite. Dell Precision M50 battery, Space development has greatly promoted the development of solar cells. At the same time, ground with solar cell research is also ongoing, in particular, the energy crisis in 1973, has greatly accelerated the development of solar cell surface. Many countries for the development, use of solar cells for solar power generation into a considerable amount of research funds. So far thousands of flying in space, aircraft, most are equipped with solar systems. The first artificial satellite into space, is the starting point for the use of photovoltaic technology development, after nearly five decades of development, it has formed a new solar photovoltaic science and engineering. Both in space flight applications, or as a ground power systems applications, from development speed, technology maturity and applications point of view, are the new energy photovoltaic technology leader.



Photovoltaic power generation has many advantages: such as: safe, reliable, no noise, no pollution, energy widely available, without geographical restrictions, not fuel consumption, no mechanical moving parts, low failure rate, Dell Inspiron 3700 battery, Dell Precision M40 battery, Dell Precision M50 battery, dell Inspiron 700m battery, easy maintenance, can be unattended, the construction stop short cycle, random size, no frame transmission lines, can easily combined with other buildings, these advantages are the other ways of power generation.



Current international large-scale use of batteries for the single crystal silicon solar cells, polycrystalline silicon solar cells and amorphous silicon solar cells, three, three batteries each about 1 / 3 of the market, China currently has seven solar cell production lines, mainly production of silicon and amorphous silicon solar cells, polycrystalline silicon solar cells have a small amount of production. China's production of silicon solar cell efficiency of 12-13%, 10% polycrystalline silicon solar cells, amorphous silicon solar cells at 5-6%. Crystalline silicon solar cell research is a step in the high-efficiency, thin, large area in the direction of development. Crystalline silicon solar cells in China in 1995,dell Inspiron 700m battery, the component reference price $ 45 / watt, amorphous silicon solar module is 25 yuan / W, conventional energy is still several times, but in areas without electricity and convenient place to pull , has produced good economic results

Par battery to dell - Publié dans : Dell laptop battery
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Jeudi 28 juillet 2011 4 28 /07 /Juil /2011 04:21

Cathode materials, anode materials, separator,dell laptop battery
electrolyte is a lithium primary raw materials, accounting for nearly 80% of the entire cost of materials.

Second, the introduction of lithium battery materials

1. Cathode material

1) cathode materials classification and comparison

Including lithium cobalt oxide cathode materials (LCO), lithium manganese oxide (LMO), nickel-cobalt-manganese ternary material (NMC), lithium iron phosphate (LFP) and so on.

LCO is a pioneer in commercial applications, it has been relatively mature technology and has been widely used in small, low-power portable electronic products, such as mobile phones, laptop computers, digital electronic products. LCO localization has been almost 10 years, since 2004 the market developed rapidly in 2006 to an average increase of about 25% this year; It is understood that the domestic lithium battery cathode materials for domestic enterprises nearly 90%, supply and demand is relatively stable, From the industry life cycle perspective, LCO market after years of rapid development, is about to enter the stable. At present, domestic manufacturers are LCO Hunan Shanshan, Hunan Ruixiang, National Security MGL, Beijing when the upgrade.

LCO LMO primarily as an alternative to the advantage of manganese-rich, dell Inspiron 710m battery, cheap, safe, dell Inspiron 710m battery, dell F5136 battery, dell 312-0306 battery, but its biggest drawback is the low capacity, poor cycling performance, which is limited mainly due to the development of LMO, the current method by doping improve its performance. LMO wide range of applications, not only for mobile phones, digital and other small battery, battery power is currently one of the main choice of materials, and LFP compete in the battery in the field situation. Domestic producers, including Hunan Shanshan LMO, the National Security MGL, Qingdao dry transport, pouring, etc. Shenzhen.



NMC, the ternary materials, combines the advantages of LCO and LMO in small, low-power batteries and high-power batteries are used. Tianjiao major manufacturers including Shenzhen, Henan thinking and so on.



LFP is considered to be the most suitable for battery cathode materials with high stability, security has become a national, enterprise competing research focus. HC D & B believes that the current domestic companies claim to produce a lot of LFP, LFP country the size of nearly 6,000 tons of production capacity, but the actual number is far lower than the production capacity of several, mainly because the technology still can not reach the performance requirements of lithium batteries manufacturers and LFP international patent disputes still affect their development in the country. Currently, the major manufacturers including Tianjin Stellan, Peking University first and so on.



Domestic application of the cathode materials include artificial graphite, natural graphite, CMS (mesophase carbon microbeads), lithium titanate, which is divided into artificial graphite and artificial graphite artificial graphite composites, natural graphite into natural graphite,dell F5136 battery, modified natural stone ink and so on.



Negative electrode materials industry in recent years, rapid development of faster growth of domestic enterprises, the 2008 national anode material of nearly 9,000 tons of actual delivery, up 41. Currently, artificial graphite anode materials still mainly with natural graphite, graphite material in the anode material accounts for about 85%; followed by the CMS.



Anode materials manufacturers, including Shenzhen Bei Terui, Shanghai Shanshan, long sand sea capacity and so on.

With the domestic lithium battery production scale, the demand on the diaphragm mid-rise, since 2006, the overall annual market volume growth diaphragm were about 30%. Since the diaphragm 2006 and 2007 a number of domestic enterprises put into production, domestic supply of the diaphragm increased significantly, but the domestic manufacturers of lithium batteries used in most of the diaphragm from imports, such as Japan, Asahi, UBE, the United States Celgard and so on.



Diaphragm relative imports, domestic divide cheap, easy to lithium battery manufacturers and nearby drawing, but the poor performance of domestic divide, still primarily used for mobile phones, digital and other lithium batteries.



Domestic manufacturers, including Jinhui Tech membrane, Star source material, Xinxiang Douglas.Ryan and so on.

Since 2006, the domestic market developed rapidly in the electrolyte,dell 312-0306 battery, electrolyte lithium battery basically domestic manufacturers, import less.



After several years of development, dell Inspiron 710m battery, dell F5136 battery, dell 312-0306 battery, the basic electrolyte company completed the production release of its upstream lithium battery industry demand is relatively stable, the electrolyte industry into a temporary period of stability.



Domestic manufacturers, including Zhangjiagang Guotai Huarong electrolyte, Dongguan Shanshan, new chou, Taurus, Tianjin, Guangzhou and heaven-sent and so on.



Electrolyte materials for the core LiPF6, more difficult because of production technology, is currently Morita chemistry, several Japanese companies a monopoly.



The author describes: Shen Wei, HC D & B Research Fellow, Industrial Division, is responsible for research in the field of machinery and lithium batteries. University of Petroleum (East China), Bachelor, Master of Economics, University of Shanghai, has four years of market research experience. Services to numerous domestic and foreign products, such as general machinery, engineering machinery, lithium batteries, chemical industry, dozens of customers. Clients include Sumitomo, Hitachi, Schneider, Degussa, U.S. ITW and so on.

Par battery to dell - Publié dans : Dell laptop battery
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