Type classification
1, oxide solid lithium battery
2, sulfide solid lithium battery
3, thin film solid lithium battery
4, polymer solid lithium battery
Advantages of solid lithium battery
1, simplified production process
2, High energy density
3, high safety
4, long cycle life
Currently, BYD "solid state" batteries have two routes:
2016 Polymer: Perfluorosulfonimide ions are the anion center of anionic ionic liquid polymers. Its binding capacity for Li+ is relatively small, which is conducive to the improvement of the conductivity and Li+ migration number of the composite solid electrolyte.
2019, oxide : The positive electrode material is a core-shell structure, including lithium-containing transition metal oxide and Ti203, and the ionic conductivity is 10^(-8)S/cm. When the voltage is 3V, the lithium-containing transition metal oxide can be deliquefied to form an oxide with a conductivity of 10^(-6)S/cm.
is said to be the current sulfide technology route, trial production has been completed and the test standards have been met, and the car will be ready for use .
other companies' "solid state" battery progress
1, Ganfeng Lithium Industry : The construction of 4GWh production capacity has been started. Planning to build Chongqing to build the largest solid-state battery production base in China. First generation mixed solid-liquid: 260Wh/kg, 2000 room temperature cycles, low-temperature energy retention rate of -20℃ 85%. Second-generation lithium metal negative electrode: 400 Wh/kg.
2. Beijing Weilan: Founded in 2016, relying on the Institute of Physics, Chinese Academy of Sciences, it is currently cooperating with NIO . It will launch a semi-solid state battery with a range of 1,000 kilometers based on the ET7 model, with an energy density of 360Wh/kg and 150KWh.
3, Qingtao Energy: Founded in 2016, founded by the team of Academicians of Tsinghua University Nancewen, garnet structure LLZO solid electrolyte, 400Wh/kg+.
4, CATL : Deeply cultivated for many years, no time to mass production.
5, Guoxuan Hi-Tech : 360Wh/kg, semi-solid state.
6, honeycomb energy: 350-400Wh/kg.
7, Fineng Technology : Semi-solid soft package 330Wh/kg.
Future mass production and market application
1. At present, there are many types of solid-state lithium batteries, and appropriate preparation, characterization and testing methods need to be adopted according to the specific type (inorganic, organic, composite) and structure;
2. It aims at the simplified production process, high energy density, high safety, long cycle life and other advantages. During the development process, accurate testing and evaluation are required to be further clarified;
3. The main performance indicators of solid electrolytes are: ionic conductivity, electronic conductivity, electrochemical window, full battery performance, etc. There are many influencing factors and standardized testing methods are required to obtain accurate measurement results;
4. Stable quantitative pressure is crucial to the accurate evaluation of solid lithium battery performance.
