What is the applications of lithium titanate batteries in electric vehicles and energy storage?

There are not many manufacturers in the world that can mass-produce lithium titanate batteries, mainly represented by the United States Otrium and Japan Toshiba Group. The application market of lithium titanate batteries mainly includes electric vehicles, energy storage markets and industrial applications.

The United States has its own unique core technology for the manufacture of lithium titanate batteries in the United States. It is still in the leading position in the manufacture of large-size lithium titanate batteries in the world, and has solved the so-called "flatulence" problem. At present, its fourth-generation 65Ah monomer lithium titanate battery has been used for energy storage systems, and there is still no significant capacity attenuation at the 65 °C cycle.

In the application of lithium titanate battery systems, the hybrid electric bus provided by Oterium for California has been put into operation since 2008. Its fuel economy index is 106.4 kg/L much higher than 23.8 kg/L for ordinary diesel generators. The company provides a 1MW storage system for the 10.5 MW wind farm of the Hawaii Natural Energy Institute and is connected to the local grid, while providing technical support services for a period of three years. This lithium titanate battery energy storage system is mainly used to regulate the voltage fluctuations of renewable energy sources and control the load change rate of the unit within 1 MW/min.

Oteri's 1MW large-capacity high-power energy storage unit is currently the only large-capacity lithium titanate battery product that has been commercially operated and tested for performance quality for more than two years in the United States grid. The energy storage system has more than 500,000 cycles, the total charge and discharge power exceeds 3300 MWh, the system capacity loss is less than 2 %, and the power has not significantly attenuated.

Toshiba Japan mass-produces lithium titanate batteries under the brand name "SCiB". Among them, 3.2 Ah, 10 Ah, and 20 Ah aluminum shell square batteries are mainly used for electric motorcycles, electric vehicles, and motor vehicles. The SCiB battery has the advantage of fast charging and long life. It can charge more than 90 % in 10 minutes, and the repeated charge and discharge capacity of 3,000 times is less than 10 %. It has been used in bulk on the "EV-neo" electric motorcycle.

In terms of energy storage, Toshiba is applying lithium titanate batteries to large-scale energy storage power stations and home energy storage systems through the Dongfeng of the Japan New Sunshine Project. Murata, another Japanese company, has developed a new type of lithium titanate battery using lithium 5V nickel-manganese acid as the positive electrode. The voltage difference is 3.2 V, and the energy density can reach 130 H/K songs, which exceeds the current level of lithium iron phosphate batteries.

In China, there are many products of lithium titanate batteries. Such as Huzhou Weihong, Zhuhai Yinlong, Shenzhenbolei, Tianjin Jiewei Power Industry Co., Ltd., Sichuan Xingneng, CITIC UNITA Guli Power Technology Co., Ltd., Hunan fir and Anhui and Shenzhen surrounding a number of smaller Lithium titanate battery manufacturers.

Huzhou Weihong has been committed to the development of lithium titanate technology since its establishment in 2006. The company has made vertical integration of lithium titanate materials, diaphragm, electrolyte and cathode materials needed for the production of lithium titanate batteries. In order to meet the market demand in recent years, Huzhou Weihong has the production capacity of 80,000 10Ah lithium titanate battery products per day and the production capacity of multiple lithium titanate battery products that are twice as large as lithium titanate batteries.

By the end of 2014, Huzhou Weihong's 10-minute rapid recharging battery system had equipped more than 3,000 hybrid electric buses, mainly sold to the United Kingdom, the Netherlands and Chongqing, China. In terms of energy storage market, Huzhou Weihong installed lithium titanate battery energy storage systems for power grid FM and power grid demand management in Vermont and Chongqing, China.

Zhuhai Yinlong's currently mass-produced lithium titanate battery products include 20Ah and 65Ah soft-pack batteries and 25Ah, 30Ah, and 55Ah cylindrical batteries. The performance index has reached the lithium titanate battery produced by Otrium in the United States. 100 % DOD batteries have more than 16,000 cycles, and 10 % DOD has reached 1.6 million times. All of these batteries have been tested by third parties at the North Automotive Quality Supervision and Inspection Laboratory(201).

In terms of application, Yinlong's new pure electric bus uses a cylindrical, long-lived, fast-charging lithium titanate battery with a range of 30 to 80 km. It can be quickly charged for only 6 to 10 minutes, and can also be used at night. The valley is filled with slow power for 30 to 60 minutes. The series of models have successfully launched bus systems in Yuguangdong, Hebei Handan, Shijiazhuang and other places.

Yinlong's antique car designed for Beijing's public transport design was put into commercial operation in September 2014. The car was also designated as the official designated vehicle for the Beijing APEC meeting. In the energy storage market, Yinlong has undertaken 863 national energy storage projects in cooperation with the National Grid and the Southern Grid respectively. For the Zhangbei scenery storage and transmission demonstration station and Shenzhen Baoqing battery storage station, two 2MWh and one 600kWhite lithium titanate system are provided with partial modules, battery box design, and system solutions.

Shenzhenbolei can produce good performance Li4 Ti5O12 materials through unique material processing methods, and through technical research projects, the design and preparation of high-performance Li4 Ti5O12 has been started from the improvement of the production process of lithium titanate batteries. Significant progress has been made. The currently mass-produced products include 17Ah, 20Ah, and 25Ah cylindrical batteries, which solve the problem of lithium titanate batteries that are prone to gas expansion, obtain high-performance lithium titanate battery products, and obtain authoritative third-party detection reports.

Starting from the design of high-power Li4 Ti5O12 electrode materials, Bolei studied the interface side reaction of Li4 Ti5O12 materials to reveal the gas generation mechanism and the solution mechanism to the large-scale application of Li4 Ti5O12 electrode materials in power cells and made major breakthroughs.

Tianjin Jetwei received the transfer of technology for the production of lithium titanate batteries in the United States, and combined its own technology accumulated over the years in the production of polymer soft package power batteries to live alone. The company successfully broke through the gas problem and already has the technology and ability to mass-produce large-size monomer lithium titanate batteries. The battery capacity reaches 60Ah, and the cumulative shipment volume is 20 million Ah.

The battery can withstand continuous charging and discharging above 10C, with a lifetime of more than 20,000 times and a temperature range of -40 to 60 °C. It is mainly used in fast charging buses and FM storage power stations.

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