The development of 32700 battery technology has entered the "second half" and research and development should be combined with the development trend of electric vehicles

"The performance of pure electric vehicle power lithium-ion batteries should be directed towards a range of more than 600 kilometers, a fast charging capability of 80% of the power within 10 minutes, a life of more than 15 years, high and low temperature performance of -40 degrees Celsius to 70 degrees Celsius, safety prediction function, and lowering the height of the battery pack to improve passenger comfort." Recently, Wang Yu, chairman of Farasis Energy Technology (Ganzhou) Co., Ltd., expressed his expectations for the future performance of power lithium-ion batteries at the 4th International Summit on the Use of Power Lithium-ion Batteries.

The research and development of power lithium-ion batteries should be closely related to the car

The subsidy policy for new energy vehicles is about to be withdrawn, allowing power lithium-ion battery companies to "sprint" with energy density indicators to a certain extent. Power lithium-ion battery companies can finally breathe a sigh of relief and calm down to seriously think about how to go in the future.

At the meeting, the delegates generally believed that when power lithium-ion battery companies conduct technology selection and research and development, they should closely combine with the development trend of electric vehicles and grasp the "hand of God" of downstream vehicle companies.

"The direction of technology development of battery companies should be guided by user needs fed back from vehicle companies." Yao Wanhao, deputy general manager of Jiangsu Tafel New Energy Technology Co., Ltd., pointed out at the meeting.

Liang Rui, vice president of Xinwanda Electronics Co., Ltd. and president of Xinwanda Electric Vehicles, said that in recent years, my country's power lithium-ion battery industry has indeed made great achievements, but the safety, cost and quality of some products of batteries are still far from market demand.

"At present, the manufacturing level of the domestic battery industry is still at the third-tier level, and there is still a gap from the industrial level and the automotive level. The specific manifestation is that the qualified rate of most companies' products is very low, about 90%, and the waste is relatively large. Japanese and Korean companies are usually two to three percentage points higher than domestic companies, and can even reach more than 95%. Manufacturing costs have become the most important reason for the high cost of batteries." Yang Rukun, chairman of Shenzhen Jiyang Intelligent Technology Co., Ltd., said.

Liu Jincheng, Chairman of Huizhou Yiwei Lithium Energy Co., Ltd., believes that the next generation of lithium-ion battery technology should be closely related to the next generation of electric vehicles; the next generation of battery people should be car people, that is, they should plan their behavior according to the industrial development path of automobiles in order to make the power lithium-ion battery industry develop healthily. The most critical requirement is to be safe and reliable. Safety and reliability are the natural attributes of power lithium-ion batteries. The so-called natural attributes must be possessed first. Batteries must be safe and reliable before they can be used as power lithium-ion batteries.

Li Yong, Chairman of Fengfan Co., Ltd., holds the same view. He believes that on the premise of adhering to the bottom line of quality, we should focus on key technologies and seek breakthroughs.

Wu Feng, an academician of the Chinese Academy of Engineering, proposed that battery companies should jointly develop battery materials, processing technology, etc. with vehicle, material and equipment companies, develop different models and matching different battery products according to market demand, configure different outputs, and improve output utilization.

Steadily improve energy density under the premise of safety

The development of new energy vehicles is about to enter the era of no subsidies. Although the energy density of power lithium-ion batteries has been "relaxed" to a certain extent, this does not mean that power lithium-ion batteries will stop advancing towards higher energy density goals in the future. Instead, they should steadily climb to a higher peak of energy density while ensuring safety and actual market demand.

In recent years, ternary batteries have developed rapidly, and the energy density of some products exceeds 300 watt-hours/kilogram; lithium iron phosphate has made progress in high-density silicon-carbon negative electrodes, and the energy density can reach 200 watt-hours/kilogram.

Wu Feng pointed out that in the future, high-energy lithium-ion batteries will use lithium-rich manganese-based materials, and the energy density can exceed 400 watt-hours/kilogram, and can break through the limit of single-electron reactions and become multi-electron reactions. At the same time, solid-state batteries will also become one of the future development directions.

At present, improving the energy density of power lithium-ion batteries is mainly achieved through structural adjustment or optimization of battery positive and negative electrode materials, such as switching positive electrode materials from lithium iron phosphate to ternary materials.

Sun Chunsheng, technical manager of Xianghe Kunlun Chemical Products Co., Ltd., pointed out that even ternary materials have transitioned from NCM333 to NCM523 in pursuit of higher energy density, and then gradually to NCM622 and NCM811. High-nickel materials such as NCM811 also have higher technical requirements for electrolytes, negative electrode materials, etc. Therefore, it is very necessary to conduct basic theoretical research and innovation in advance.

To this end, Kunlun Chemical's product research and development plan must continue to deepen around liquid electrolytes, focus on the research and development of special lithium salts and additives, and will also focus on the research and development of all-solid-state electrolytes.

Zhou Jiang, executive vice president and director of the research institute of Tianjin Lishen Battery Co., Ltd., said that the difficulty of high-energy-density batteries lies in balance. In terms of key indicators of power lithium-ion batteries, such as energy window, to meet energy requirements, it is a choice of 0 and 1.

For example, for high-nickel materials, circulation or storage under high temperature conditions is prone to problems such as processing gas and cracking, and safety is also insufficient. And for silicon materials, it is also easy to cause expansion and other problems, so it is necessary to find a perfect balance point in the design stage.

Improving energy density and safety can also be done from new processes. Hou Min, vice president of Ruipu Energy Co., Ltd., explained that in the system design stage, Ruipu Energy built a five-level four-dimensional safety matrix diagram, establishing electrical characteristics, structural characteristics, thermodynamics and electrochemical characteristics from the material, battery, module, battery pack, and system levels, and controllable safety design principles and specifications to effectively direct product design and development.

In addition, the industry-leading stepless die-cutting technology is adopted to effectively improve the specific energy and safety of the product. By introducing interface solidification technology and low heat and low impedance technology, the consistency and cycle life of the product are effectively improved.

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