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Lithium-ion battery high voltage technology and industry development status Views [0] Published: 2018-06-29 11:01:23

As the demand for lithium-ion battery capacity continues to increase with the use of electrical equipment, people are increasingly expecting higher energy density of lithium-ion batteries. In particular, various portable devices such as smart phones, tablet computers, and notebook computers impose higher requirements on lithium ion batteries having a small size and a long standby time. Also in other electrical equipment, such as: energy storage equipment, power tools, electric vehicles, etc. are also developing lithium ion batteries with lighter weight, smaller size, higher output voltage and power density, so the development of high energy density Lithium-ion batteries are an important R&D direction in the lithium battery industry.

A background of high-voltage lithium-ion battery development

In order to design a high-energy-density lithium-ion battery, in addition to the constant optimization of its space utilization, the compact density and gram capacity of positive and negative electrode materials are improved, and high-conductivity carbon nano- and polymer adhesives are used to increase the positive and negative electrodes. Apart from the active substance content, raising the working voltage of the lithium ion battery is also one of the important ways to increase the battery energy density.

The lithium-ion battery's cut-off voltage is gradually transitioning from the original 4.2V to 4.35V, 4.4V, 4.45V, 4.5V and 5V, among which the 5V nickel-manganese-lithium-ion battery has excellent characteristics such as high energy density and high power. One of the important directions for the development of new energy vehicles and energy storage in the future. With the continuous development of power supply R&D technology, higher-voltage, higher-energy-density lithium-ion batteries will gradually come out of the laboratory and serve consumers.

Two high-voltage lithium-ion battery applications

Generally speaking, high-voltage lithium-ion battery refers to a battery with a unit charge-cutoff voltage higher than 4.2V, such as a lithium-ion battery used on a mobile phone. The cut-off voltage develops from 4.2V to 4.3V, 4.35V, and then to 4.4V. (Millet mobile phones, Huawei mobile phones, etc.) At present, 4.35V and 4.4V lithium-ion batteries have matured in the market, and 4.45V and 4.5V have also begun to gain favor in the market and gradually mature.

At present, the manufacturers of mobile phones and other digital electronic products at home and abroad are moving in the direction of high-voltage lithium-ion batteries. High-voltage and high-energy-density lithium-ion batteries will have a larger market space in high-end mobile phones and portable electronic devices. Cathode materials and electrolytes are key materials for improving the high voltage of lithium-ion batteries. The use of modified high-voltage lithium cobalt oxide and high voltage ternary materials will become more mature and common.

With the increase of voltage, high-voltage lithium-ion batteries will have lower safety performance during use, so there is no batch use in power cars. At present, the battery cathode materials used in power automobiles are mainly based on ternary materials and lithium iron phosphate. In order to increase the energy density to meet the demand, high nickel cathode materials such as 811NCM and NCA, high-capacity silicon carbon anodes, or improved utilization of the battery space are generally selected to enhance their energy density and endurance.