Safety and quality are more important for lithium batteries

Date:Nov 08, 2019

The safety and quality of polymer lithium batteries is an important guarantee for mobile power products. Yoshio Nishi, the founder of the lithium battery industry and former senior vice president and chief technology officer of Sony, said at the South China Lithium High-Level Forum that safety and quality are more important than lithium-ion batteries for weight and energy density. Yoshio Nishi pointed out that at present, Japanese professors have developed a new type of anode active material, which is composed of organic compounds. It has a discharge capacity of up to 225 mAh, compared to 140 mA for conventional materials.

At the same time, the polymer lithium-ion battery cycle performance is very good. Yoshio Nishi believes that such a battery can create another lithium-ion battery energy world.

The following is a summary of the speech by Yoshio Nishi, founder of the lithium battery industry, former senior vice president and chief technology officer of Sony:

Yoshio.Nishi: This morning I will talk about the past and present of lithium batteries, and my expectations for future improvements in lithium batteries. I am coming to Shenzhen for a second time. Today's theme is a rechargeable battery, which is indispensable in our lives. The Japanese said: Any form of life without a battery is a pity, just like an empty shell. Among the lithium-ion batteries, some of the most unique materials require special materials compared to secondary batteries. These materials are very important in the success of lithium-ion batteries, and now I will talk about some of Sony's work on lithium-ion batteries. Regarding the CUI negative electrode description, he said that carbon can be used in the negative activity. This is the first page of the Japanese patent. You can see that this is the first page of the German patent. He applied for the patent in August 1978... Lithium-ion batteries also have an anode material, which is a silver oxide cell, and nickel acid is a chemical structure. We found that lithium nickelate can be worn in the carbon system, which is our silver nickelate. At the same time, a British company has applied for a patent, and they are also materials with anodes in this field. I mentioned the Japanese patent just now. We have illustrated some oxide materials. The British patents are similar to ours. In my opinion, the simple combination of lithium, solid and silver is not an invention. You change the anode-cathode. Materials can be patented. This is a photo of the battery. Sony introduced the lithium-ion battery to the market in 1991, when it was very heavy. Mass production in 1992, Sony began mass production of lithium-ion batteries, such lithium-ion batteries began to be applied to Sony's video recorders.

Polymer lithium-ion battery cycle performance is very good, 1000 cycle capacity is maintained at 80, so I think that such a battery can give us another world of lithium-ion batteries, there are much information on lithium-ion batteries can be reported, but there are some are not practical, there is no practical application, from the perspective of lithium-ion batteries. The Japanese associate professor said that he has developed a new type of anode active material, which is composed of organic compounds. Its discharge capacity is higher than that of conventional materials, and the tradition maybe only 140 mAh, but this can reach 225 mAh every moment. This is the charge and discharge diagram of the TOT. The discharge is performed under constant voltage. The average discharge voltage is 2.6 volts. The specific gravity of active material is very important. The proportion of TOT is not shown. We assume that its weight is 2.0 and the actual density is 710 mA. Does TOT have an actual high discharge capacity as an anode material? So there are several new reports this year. Our keywords for lithium-ion batteries are “safe and fast.” I now summarize that volume, energy, and density are more important than weight energy density, so we pay more attention to the anode-cathode volume material density. The anode material voltage is very important. Safety and quality are very important, so for the lithium-ion battery, the keyword is "safety first quality first" thank you for listening.

"Safety first" only achieves the "safety control of battery manufacturing, the consistency requirements of battery grouping", the safety of the terminal products, and the consumer's assured experience can be realized. At present, the mobile power battery in our market is basically a polymer lithium battery except for the 18650 battery. If the safety performance of the polymer lithium battery is completed, the safety of the mobile power supply will be more secure!

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