Jiangxi enterprises break the world's problems

Automotive power battery technology is the bottleneck that restricts the development of electric vehicles. How to manufacture high-powered, fast charging, long-lived high-safety power batteries is also a world-class problem. On January 10th, the reporter learned from the Nanchang High-tech Zone Management Committee that polyimide (PI) nanofiber battery separators have been successfully industrialized in Nanchang. This indicates that Jiangxi has mastered the world's first power battery separator product technology. It is also the first high-tech product in China's lithium industry that has mastered core technology and has original independent intellectual property rights.

Whether from the perspective of environmental protection, the need for industrial upgrading, or out of consideration for energy security, the development of new energy industries requires highly efficient energy-storage power batteries. However, problems such as poor battery safety, long charging time, and short battery life time have not been solved. Countries such as the United States, Japan and South Korea also continue to conduct similar research and development. The application of PI nanofiber membranes in lithium batteries and supercapacitors overcomes the fundamental disadvantages of poor high-low temperature performance and low safety of conventional separators, whether in terms of power density, energy density, high temperature performance, or cycle life, and other technical indicators. At this stage, there are obvious advantages.

According to a report from a national authoritative inspection agency, PI separators prepared with high-end PI nanofiber membranes have obvious advantages in key technical indicators. First, the charge and discharge time is short, and the battery charge and discharge rate can be increased by more than 4 times. Discharge time is only 1/4 of the previous; Second, long service life, cycle life increased by more than 700%; Third, the low temperature of the fever, reducing the temperature of the single cell battery to 12 degrees Celsius; Fourth, the power density, energy Density increased by more than 15%; Fifth, security is good. This new type of separator has excellent safety: PI separator can withstand high temperature above 530 degrees (the diaphragm on the market will melt above 140 degrees), and when the car's violent impact causes the perforation of the battery diaphragm, it will not cause the battery to explode and catch fire.

Recently, Jiangxi Xianxian Nanofiber Technology Co., Ltd., which masters this technology, has realized the industrialization of PI nanofiber battery separator technology and is expected to achieve a capacity of 7 million square meters this year. By 2015, the company's production capacity will reach 40 million square meters.