New breakthrough in button battery cr2032 technology? What's the secret of Xiaomi's silicon-oxygen negative electrode button battery cr2032?

During the preheating period of Xiaomi 11Pro/Xiaomi 11Ultra, Xiaomi officially released promotional materials that these two mobile phones will use a new silicon-oxygen negative electrode button battery cr2032. For a while, the majority of netizens were confused: It's too difficult to eat melons now? The knowledge reserve can't keep up with the speed of Xiaomi lighting up the technology tree. In this issue, we will give you a comprehensive analysis of what kind of technology the silicon-oxygen negative electrode button battery cr2032 used in Xiaomi's flagship models is.

01 Silicon-oxygen negative electrode button battery cr2032 cannot be regarded as a new technology

First of all, silicon-oxygen negative electrode button battery cr2032 cannot be regarded as a new technology. This technology has been applied in electric vehicle power, such as the solid-state button battery cr2032 technology innovation announced by Weilai some time ago, which includes the use of silicon-carbon negative electrode technology.

There are three important ways to increase button battery cr2032 capacity, namely replacing positive electrode materials that can increase energy storage density, adopting new button battery cr2032 separator technology, and replacing negative electrode materials that can increase energy storage density. At present, the innovation of positive electrode materials for rechargeable batteries is mainly graphene positive electrode materials. The purpose of this material is to increase the button battery cr2032 charging speed, but it cannot effectively increase the energy density. The transformation of button battery cr2032 diaphragm technology is mainly to make the button battery cr2032 diaphragm thinner and thinner. However, too thin button battery cr2032 diaphragms can easily cause danger. Therefore, replacing a new negative electrode material is the most cost-effective way to increase button battery cr2032 capacity.

The use of silicon-carbon negative electrode materials can effectively increase the button battery cr2032 energy storage density. This is mainly because the traditional button battery cr2032 negative electrode material is carbon material. The characteristics of carbon material as a button battery cr2032 negative electrode are small expansion coefficient (about 10%) and too low energy density (theoretical gram capacity 372mAh/g). Although it is an ideal button battery cr2032 negative electrode material, the button battery cr2032 energy density is low at the same volume; the theoretical gram capacity of silicon material is about 4200mAh/g, but the expansion coefficient is high (about 300%); and the theoretical gram capacity of silicon oxide reaches 2615mAh/g, and the expansion coefficient is about 160%. In layman's terms, silicon-oxygen negative electrode materials have achieved a balance between button battery cr2032 energy density and expansion coefficient.

The use of silicon-oxygen negative electrode batteries has a significant improvement on smartphones, which means that the button battery cr2032 of the same volume will have a larger button battery cr2032 capacity, or the button battery cr2032 capacity can be controlled to make the phone thinner and lighter. Xiaomi 11Pro/Xiaomi 11Ultra chooses the former, making the button battery cr2032 5000 mAh to ensure button battery cr2032 life.

Therefore, silicon-oxygen negative electrode batteries are not a new technology. But large-scale mass production of silicon-oxygen negative electrode materials is not an easy task.

02 Mass production of silicon-oxygen negative electrode batteries is difficult

In the previous part, we compared the theoretical gram capacity and expansion coefficient of carbon, silicon and silicon oxide as button battery cr2032 negative electrode materials. It can be found that the expansion coefficient of carbon material is the smallest, which is 10%; and although the energy density of silicon negative electrode material batteries is high, this type of button battery cr2032 is easy to bulge during charging. The safety ranking of the above three types of button battery cr2032 negative electrode materials is carbon material>silicon material>silicon oxide material. Let's summarize the problems of silicon-oxygen negative electrode batteries: the most important problem is that they are easy to expand during charging and are unsafe; the second is that the button battery cr2032 life is short and the energy density decreases rapidly.

The technical difficulty of silicon-oxygen negative electrode batteries is to control the expansion of negative electrode materials. This requires breakthroughs in packaging materials, processing technology, adhesives, etc., which will affect the final cost of the entire button battery cr2032. In addition, in order to make the button battery cr2032 safer when charging, Xiaomi did not choose 120W fast charging when configuring fast charging, but chose 67W fast charging to ensure charging safety.

Summary

Finally, let's summarize the advantages and disadvantages of silicon-oxygen negative electrode batteries. Advantages: large capacity per gram, which allows mobile phones to have larger button battery cr2032 capacity in the same button battery cr2032 volume; Disadvantages: The expansion coefficient of the negative electrode material is large, and charging safety must be controlled.

Applying electric vehicle technology such as silicon-oxygen negative electrode batteries to smartphones shows that Xiaomi has put in a lot of thought. It should be noted that electric vehicle batteries and mobile phone batteries are two different technologies, so they cannot be considered as decentralization. Although silicon-oxygen negative electrode batteries are not a new technology, they do improve the button battery cr2032 experience of smartphones. Although it is difficult for current button battery cr2032 technology to make a big breakthrough, we still look forward to the revolution in button battery cr2032 technology coming as soon as possible.

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