It can stand the hot climate, the ice and snow, the fast charging and the low cost. Such a "beating" lithium battery is real On May 24, the reporter learned from the Shenzhen Institute of advanced technology of the Chinese Academy of Sciences that a new lithium-ion battery technology of Tang Yongbing team of the Institute of carbon neutralization (preparation) of the Chinese Academy of Sciences completed large-scale mass production on May 24
Frost resistance and heat resistance, with a qualified rate of more than 99%
Local (left) and batch test (right) of large-scale production line of new battery source: drawing provided by Shenzhen Advanced Research Institute
Statistical data show that the qualified rate of products produced in this large-scale mass production reaches 99.11%, and the qualified rate of each process is more than 99%.
The team said that this is the first battery cell product with wide temperature range, low cost and long life in China, which is expected to break the pattern of battery industry.
Adapt to the ambient temperature difference "across" 150 ℃
From cars to electronic products, lithium-ion batteries have long penetrated into people's lives, providing "power" for clothing, food, housing and transportation. According to the 2021 white paper on China's lithium battery industry development index recently released by CCID Research Institute of the Ministry of industry and information technology, China has become the world's largest lithium battery consumer market for five consecutive years.
However, limited by the key materials of the battery, a major limitation of the current lithium-ion battery is that it cannot be charged at a low temperature below zero, and its safety cannot be guaranteed at a high temperature above 50 ℃. China has a vast territory, and the temperature varies greatly with regions and seasons. The temperature in winter in the north can be as low as - 40 ℃, while the surface temperature in summer in the South can be as high as more than 50 ℃. Electric vehicles cannot be started in winter, smart phones automatically shut down, and spontaneous combustion of electric vehicles in summer occur frequently.
High and low temperature performance test of new battery (left: - 70 ℃ test, right: 80 ℃) source: drawing provided by Shenzhen Advanced Research Institute
To this end, Tang Yongbing's team has developed a new lithium-ion battery technology that is both freeze-resistant and heat-resistant for nearly 10 years. The minimum working temperature can reach - 70 ℃, while the maximum working temperature can reach 80 ℃, and the low-temperature and high-temperature performance can be taken into account at the same time.
It is reported that the high and low temperature performance, cycle life, safety performance and other indicators of the product have been tested by a third-party authority, and have obtained ISO9001, gb31241-2014, IEC 62133-2:2017, UN38.3 and other standards and qualification certificates.
Research and development of key cathode materials
Where is the "new" of the new battery? The team mainly focuses on negative electrode materials and electrolyte.
It is understood that at present, the technology related to the cathode material of the battery is close to the "ceiling". In order to improve the performance, there is still room for the development of the cathode material. To this end, the team has developed a new type of aluminum matrix composite cathode material. By matching with the cathode material of commercial lithium-ion battery, the team has successfully developed new products such as lithium manganate, lithium iron phosphate and ternary battery for different application scenarios.
"In addition to the characteristics of heat resistance and frost resistance, the battery products we developed also have the advantages of high safety, long endurance, fast charging and low cost." The team said.
In terms of safety performance, with the continuous use of conventional lithium batteries, lithium dendrites will be generated inside, which will not only affect the charging capacity, but also pierce the diaphragm and bring hidden dangers such as battery short circuit. The new aluminum based anode developed by the team can effectively alleviate the generation of lithium dendrites and improve safety under low temperature and overcharge conditions.
In terms of endurance performance, thanks to the high theoretical capacity of aluminum based negative electrode material, the energy density of the battery is 13% ~ 25% higher than that of traditional lithium-ion battery, which can achieve long endurance. In addition, due to the excellent conductivity of aluminum based composite negative electrode, the product also shows good fast charging performance. It can be fully charged in 20 minutes, which provides a solution for the charging demand of half an hour.
In terms of cost, based on the performance advantages of aluminum matrix composite cathode and the developed high-performance electrolyte, low-temperature battery products can get rid of the dependence on expensive nano cathode materials, and the battery cost can be reduced by 10% - 30%.
Application scenario "heaven and earth"
It is reported that this mass production is mainly used in the fields related to electric vehicles. The in-depth performance evaluation of batch cells has met the use needs.
The team has always adhered to the market demand. "Some scenes need minus 40 degrees Celsius to be able to charge and discharge normally, while others put forward higher requirements in terms of long cycle. Around the core technology and in combination with the actual situation, we constantly adjust the products." The team said. Related products can be applied to photovoltaic energy storage, household energy storage, communication base station energy storage, rail transit, national defense construction, aerospace, polar scientific research and other fields, especially in alpine and subtropical areas, significantly expanding the application range of batteries.
It is reported that more than 90 high-level SCI papers have been published in international journals such as nature Chemistry , nature communications , advanced materials ; At the same time, a systematic and comprehensive intellectual property layout has been carried out around relevant technologies, forming a patent pool of more than 180 patents, including PCT patents, Chinese invention patents, US, Europe, Japan and South Korea patents, and more than 120 authorized patents have been obtained.
In addition, according to Wu Xiaoli, director of the transformation Department of Shenzhen Advanced Institute, based on the new battery technology, the team successfully realized the technology transfer and transformation by relying on Shenzhen Advanced Institute and pricing 65 million yuan with intellectual property rights. In March 2017, Shenzhen Zhongke Ruineng Industrial Co., Ltd. (hereinafter referred to as "Zhongke Ruineng") was established, with a cash investment of 25 million yuan and a registered capital of 100 million yuan. At present, the project is in the process of capital and share increase negotiations, further building a large-scale production line of new batteries, and quickly promoting the application of new battery products in various fields.
Arumugam manthiram, an internationally renowned authoritative expert in energy storage materials and electrochemistry, University of Texas at Austin, USA, at ACS Sustainable Chemistry & amp; The review paper of Engineering commented on the technology, "this achievement puts forward the concept of dual function aluminum based negative electrode for the first time. It matches commercial positive electrodes such as lithium cobalt oxide, lithium iron phosphate and ternary materials. The battery shows excellent long cycle stability, making the aluminum based battery have great application potential".