The breakthrough point of lithium-ion battery technology

Laptops, smartphones and tablets, MP3, MP4, PSP, digital cameras, camcorders and other mobile devices are rapidly spreading, and the future trend of electric vehicles, and their own batteries can not survive, although the development of mobile power supplies compensates for shortcomings, so mobile The power supply is also rapidly expanding, which is closely related to the capabilities of mobile power and lithium-ion batteries. Therefore, the skills of lithium-ion batteries have become the focus of many technology and operators.

A simple lithium ion battery is composed of positive electrode, negative electrode, void and electrolyte, so lithium ion battery technology can be divided into positive electrode technology, negative electrode technology, void technology and electrolyte technology. Without major changes in the battery structure, the development of data technology has promoted the development of lithium-ion battery technology in the past few years.

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Thanks to serious reviews of new data and new skills, the key skills of lithium-ion batteries are now in the hands of Japanese manufacturers. The important positive data of lithium ion is lithium cobalt oxide, which has the advantages of stable discharge, high energy density, good cycle performance, and high operating voltage. The most important cathode data is graphite data, which has a high specific capacity, is cheap and easy to obtain. Most of the positive electrode data is now being developed and will not replace lithium cobalt oxide in lithium-ion batteries in mobile products in a short period of time, while the negative electrode data is regarded as a key critical point in the practical application of tin-gold and silicon-based alloys. Is widely expected. In 2011, Sony Corporation of Japan began mass production of 18650 batteries, using tin-based alloys, with a capacity density of 723WH/L per unit volume. Panasonic also plans to use silicon-based alloys to produce 18650 batteries in 2012. Therefore, the mobile power technology has a new breakthrough.

Fast charging skills are also the research direction of many companies. Many people previously believed that fast charging skills will be important for electric vehicles, and smart mobile devices will not be in great demand. However, with the rapid popularity of smartphones and tablets, short battery life and long charging times have become a headache for many users. The treatment should be from two aspects: On the one hand, the development plan of the battery is suitable for fast charging, including the selection of active and depressed Poles, which is corrected by macroporous/mesoporous data, the improvement of gap data and hole planning, and the development of all solid electrolytes. Choose to get used to high current, and so on.

The other is the use of double-layer capacitor (or super capacitor) components in mobile devices, which support fast charging and protect lithium-ion batteries from instantaneous high currents.

Wireless charging is also considered as a next-generation charging technology with a way out, and is regarded as a key research and development direction by many companies. The existing specifications are not uniform and the conversion power is low. In the future development, this trust will be greatly broken.