Classification and main parameter analysis of solid-state lithium-ion batteries

What is a solid-state lithium-ion battery? With the rapid development of society, our solid-state lithium-ion batteries are also developing rapidly, so do you know the detailed analysis of solid-state lithium-ion batteries? Next, let Xiaobian lead you to learn more about solid-state lithium-ion batteries.

What is a solid-state lithium-ion battery? With the rapid development of society, our solid-state lithium-ion batteries are also developing rapidly, so do you know the detailed analysis of solid-state lithium-ion batteries? Next, let Xiaobian lead you to learn more about solid-state lithium-ion batteries.

The so-called “all-solid-state lithium battery” is a lithium battery in which the electrodes and electrolyte materials used in the working temperature range are solid and do not contain any liquid components. The full name is “all-solid-state electrolyte lithium battery”. Therefore, the all-solid-state lithium battery is already the most acronym for a word that cannot be omitted and cannot be changed. In order to help understanding, Professor Ouyang gave an example, just like “all-solid-state” is different from “solid-state”, and “lithium battery” and “lithium-ion battery” are not the same concept. This all-solid-state lithium battery is further divided into an all-solid-state lithium primary battery and an all-solid-state lithium secondary battery, and the primary battery has already been used. All-solid-state lithium secondary batteries are further divided into all-solid-state lithium-ion batteries and lithium metal batteries, which are two concepts that need to be distinguished.

The so-called solid-state lithium-ion battery is a solid state regardless of the electrodes and electrolyte. Lithium-ion batteries commonly used on the market today all use liquid or polymer electrolyte materials.

The solid lithium thin film secondary battery is prepared into a thin film on a substrate in the order of anode, electrolyte and cathode, and is packaged into a battery. During the preparation process, the respective thin film layers of the battery are prepared using corresponding techniques. Generally speaking, the negative electrode is mostly made of metallic lithium, which is prepared by vacuum thermal deposition (VD) technology. Electrolyte and positive electrode including oxide negative electrode can adopt various sputtering techniques, such as radio frequency sputtering (RFS), radio frequency magnetron sputtering (RFMS), etc.

It is easy for liquids to combine with solids and penetrate into them. But the solid-solid contact and stability are not very good, which is a big problem. Although sulfide electrolytes have improved lithium ion conductivity, they still have problems with interfacial contact and stability. The third problem is the rechargeability of metallic lithium. In solid-state electrolytes, pulverization and dendrite growth also exist on the lithium surface. Its circularity and even safety still need to be studied. In addition, the high manufacturing cost is also a major problem in its development.

Classification and main parameter analysis of solid-state lithium-ion batteries

Of course, solid-state batteries are currently facing some development problems, the biggest of which is that there is still a very large gap between their own electrical conductivity and liquid electrolytes. In addition, the interfacial stability between solid electrolyte and electrode material is also one of the problems to be solved.

In terms of preparation process, due to the poor elasticity of the current solid-state electrolyte membrane, the solid-state battery assembly is more prone to delamination than the winding process, but the subdivision process is unknown. In terms of manufacturing equipment, although solid-state batteries are very different from traditional lithium-ion batteries, there is no need to customize equipment in the process of painting, packaging, etc., and the manufacturing environment must be carried out in a drying room with higher requirements. fundamentally different.

Solid electrolytes are mainly classified into two types, inorganic electrolytes and polymer electrolyte materials.

Some parameters for evaluating solid electrolytes mainly include: high ionic conductivity, low ionic area specific resistance, high electron area specific resistance, high ionic selectivity, wide electrochemical stability window, good chemical compatibility, excellent Thermal stability, excellent mechanical properties, simple preparation process, low price, easy integration and environmental friendliness.

The above is a detailed analysis of the relevant knowledge of solid-state lithium-ion batteries. It is necessary for everyone to continuously accumulate experience in practice, so as to design better products and develop better for our society.

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