Energy density of lithium-ion battery and its improvement ways

Lithium-ion battery is currently the main power supply for portable mobile device, ITC (Communications electronics) industry under the background of rapid development, which also shows a steady growth in demand. These last two years, Governments in the development of new energy sources and low-carbon economy policy is making capacity of the lithium ion battery market surge. However, with growth in demand for more powerful lithium-ion battery problem is: how to make the lithium-ion battery in the present volume releases more energy, or that release the same energy can make it smaller. This involves the development of lithium-ion batteries next can have much space. Also, we can transform this problem to how to improve the energy density of lithium batteries.
Energy density of lithium-ion batteries is a numerically equal to the battery voltage and capacity of the product, but it's only a few, practical cathode material for lithium-ion battery energy density depends on the energy density and energy density cathode material, and matches between them.
Existing anode material for lithium-ion battery graphite, graphite with a unit capacity of 400mAh/g, to graphite, unit capacity of cathode materials for lithium-ion batteries are much less, such as cathode material for lithium cobalt oxide 140mAh/g, Higher lithium iron phosphate cathode materials, 160mAh/g.Based on the barrel theory, the water level reached a level to the barrel of the most shortcomings, then, the energy density of lithium-ion batteries are also more determined by the anode material. This is the anode of lithium ion battery cathode material, are, rather the reason. So, how to improve the energy density cathode materials?
Derived from the former energy density of lithium-ion batteries, or increase capacity (production of large-capacity lithium-ion batteries lithium battery research and development is still the main directions), discharge voltage, or both at the same time to improve. Because of the low capacity of cathode materials, therefore, set out to improve discharge voltage at the cathode material as another way to increase capacity.
 For plug-in hybrids and pure electric vehicles, which require high power lithium-ion batteries can store and release more energy, has a longer cycle life. From the best lithium-ion power battery, Toyota Prius hybrid vehicles using lithium-ion batteries as auxiliary power, per gallon for about 50 miles, IBM launched the "battery 500" project requirements on a single charge of the battery power to reach 500 Miles converted into electricity needed for 125KWh. Pure electric vehicle on a single charge range requirements must call the emergence of next-generation battery cathode materials.
At present, by improving the voltage system that can selection there are two types of cathode materials for li ion battery. One is the type of spine crystal structure of LiNi0.5Mn1.5O4; the other is kind of violin crystal structure LiCoPO4. The two materials has developed a 5V cathode material for high voltage potential. Current relative lithium-ion electrode material lithium cobalt oxide the discharge voltage of about 4V, if increased voltage to 5V, you can improve the battery energy density 25%and iron phosphate cathode materials for lithium-ion batteries lithium-ion electrode relative to the voltage lower, about 3.6V, if there is voltage to 5V, the energy density upgrading will be even more impressive.

Person: Tim.lee
Company: Dongguan Large Electronics Co., Ltd
Add: Block A, Gaosheng Technology Zone, Nancheng District, Dongguan City, Guangdong Province, CN
Tel: 86-769-23182621


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