Research and characteristic analysis of key materials for all-solid-state lithium batteries

With the rapid development of society, our all-solid-state lithium-ion batteries are also developing rapidly, so do you know the detailed analysis of all-solid-state lithium-ion batteries? Next, let the editor lead you to understand the relevant knowledge in detail. All-solid-state lithium-ion batteries, as the most potential electrochemical energy storage devices, have received extensive attention in recent years. With the improvement of comprehensive technical indicators such as cycleability and safety, the application market of solid-state secondary lithium-ion batteries will gradually expand, and all-solid-state lithium-ion batteries are expected to become the leading technology route for next-generation power lithium-ion battery manufacturers.

Advantages of all-solid-state secondary lithium-ion batteries

In recent years, with the rise of electric vehicles and the urgent need for large-scale energy storage equipment for renewable energy generation, research on lithium-ion batteries has heated up again, and secondary lithium-ion batteries that are safe, large-capacity, high-power and long-life have become people's attention focus. As a new form of lithium-ion batteries, solid-state secondary lithium-ion batteries fundamentally have the advantages of high energy density of lithium-ion batteries. In addition, all solid-state secondary Li-ion batteries offer the following advantages:

(1) High safety performance: Since the liquid electrolyte contains flammable organic solvents, when an internal short circuit occurs, the temperature suddenly rises, which can easily cause combustion or even explosion. A safety device structure that resists temperature rise and short circuits must be installed, which adds cost. But still can't completely solve the security problem. Tesla, which claims to be the best BMS in the world, has caused two serious fire accidents of Model S in our country this year alone. Therefore, all solid-state lithium secondary batteries based on inorganic solid electrolytes are expected to have high safety.see more:800ah lithium battery

(2) High energy density: The energy density of lithium-ion batteries currently on the market is as high as 260Wh/kg, and the energy density of lithium-ion batteries under development can reach 300-320Wh/kg. For all solid-state lithium-ion batteries, if lithium metal is used as the negative electrode, the energy density of the battery is expected to reach 300-400Wh/kg, or even higher. All solid-state secondary batteries are expected to achieve higher power densities. The solid electrolyte uses lithium ions as a single carrier and has no concentration polarization, so it can work under high current conditions to increase the power density of the battery.

(3) Long cycle life: The solid electrolyte is expected to prevent the continuous formation and growth of the solid electrolyte interfacial film and the problem of lithium dendrites piercing the separator during the charge-discharge process of the liquid electrolyte, which may greatly improve the cycle performance and the use of metal lithium ions battery life.

(4) Wide operating temperature range: If all solid-state lithium-ion batteries use inorganic solid electrolytes, the maximum operating temperature is expected to increase to 300°C or even higher. At present, it is necessary to improve the low-temperature performance of large-capacity all-solid-state lithium-ion batteries. The specific operating temperature range of the battery is mainly related to the high and low temperature characteristics of the electrolyte and the interface resistance.

(5) Wide electrochemical window: The electrochemical stability window of all solid-state secondary lithium-ion batteries is very wide, which can reach 5V, which is suitable for high-voltage electrode materials and is conducive to further improving energy density. Currently, thin-film lithium-ion batteries based on lithium nitride phosphate can operate at a voltage of 4.8V.Also read:10kwh lithium battery 48v

(6) Advantages of flexibility: solid secondary lithium-ion batteries also have the characteristics of compact structure, adjustable scale, and great design flexibility. Solid-state batteries can be designed as thin-film batteries with a thickness of only a few microns to power microelectronic devices, or as large-scale batteries used to drive electric vehicles, grid energy storage and other fields. In these applications, the shape of the battery can also be designed according to specific needs.

Research on key materials of all-solid-state lithium-ion batteries

Polymer solid electrolyte: Polymer solid electrolyte (SpE), due to its relative composition, consists of a polymer matrix (such as polyester, polymerase, and polyamine, etc.) and a lithium salt (such as LiClO4, LiAsF4, LipF6, LiBF4, etc.) . High quality, light weight, good viscoelasticity and excellent processability have attracted widespread attention.

Oxide solid electrolyte: According to the material structure, oxide solid electrolyte can be divided into crystal and glass (amorphous). Crystalline electrolytes include perovskite-type, NASICON-type, LISICON-type, and garnet-type, etc. The research focus of glass oxide electrolytes is the LipON type electrolyte used in thin film batteries.

Oxide crystalline solid electrolyte: The oxide crystalline solid electrolyte has high chemical stability and can exist stably in the atmosphere, which is conducive to the large-scale production of all solid-state batteries. Current research focuses on improving room temperature ionic conductivity and its relationship to electrodes. Electrode compatibility has two aspects. The most important methods to improve electrical conductivity are element substitution and heterogeneous element doping. In addition, the compatibility with electrodes is also an important issue limiting their applications.

Leave a Comment

Shopping Cart