Wholesale custom household energy storage battery power wall lithium battery
Influence of lithium Powerwall battery at low and high temperature
Time:Nov 10, 2022
The high temperature, low temperature environment (below 20 ℃) and long term low temperature service environment of lithium home battery will adversely affect the performance of lithium battery. Low temperature will reduce the negative polarity of lithium ions in the diaphragm, and it is impossible to form a reversible lithium ion composite membrane, resulting in a large number of crystals generated during the use of the battery, reducing the electrochemical performance of the battery. High temperature will accelerate the decomposition of electrolyte and produce harmful substances (especially Na2SO4), thus reducing the battery performance. In addition, high temperature will also cause crystallization of materials, which will lead to poor battery performance and risk of explosion. At low temperature (below 10 ℃) or after long-term use, high temperature will cause the material to decompose and produce a series of harmful substances. The higher the temperature, the more chemical reactions will occur. Lithium Powerwall ion batteries also contain positive matrix and electrolyte components, which will adversely affect the reaction of lithium ions and electrolyte.
1. In practical application, three common lithium Powerwall battery
At present, there are three types of lithium ion batteries: all solid state batteries, rechargeable lithium ion batteries and non all solid state lithium ion batteries. Among lithium batteries, rechargeable lithium ion batteries have the following characteristics: high energy density, many cycles, and fast charging speed; Under normal temperature, it can be used at - 20 ℃~40 ℃; There is no danger of runaway high temperature heat; Thermal runaway is easy to detect and repair; Fast discharge voltage and high capacity. Among rechargeable lithium batteries, ternary lithium batteries have higher energy density and more cycles than all solid state batteries. The battery can withstand more than 100 cycles, and can be used in low temperature environment for a long time, and can be used in extremely cold areas. Therefore, ternary lithium battery is most commonly used in the application field of lithium battery. However, with the growth of market demand, ternary lithium batteries have been paid more and more attention, and their safety has become one of the most concerned and discussed issues.
2. Reasons for performance degradation of home lithium battery at high temperature
High temperature will accelerate the decomposition of electrolyte and produce harmful substances. As lithium is an inert medium, the decomposition speed of solid electrolyte is faster than that of solid electrolyte, so the composition of electrolyte has adverse effects on the cathode matrix and will also accelerate the decomposition of Na2SO4. It is difficult for Na2SO4 to form a reversible composite membrane at high temperature, which leads to the decline of electrode performance. In addition, the composition of electrolyte will affect the lithium crystal generated by the material, thus affecting the thermal performance of the battery. In order to prevent Na2SO4 crystal from depositing on the battery surface and affecting its electrochemical action, the selection of electrode materials and electrode treatment process are important factors affecting the thermal performance of the battery.
3. Which method is used to improve the low-temperature performance of lithium battery?
With the rapid development of the new energy vehicle industry, the requirements for low temperature performance of batteries are getting higher and higher. There are several ways to improve the low-temperature performance: (1) Use the battery with longer battery life to extend its working life; (2) Cathode materials with high energy density shall be used. Take Na2SO4 and MnO, two cathode materials with different ion mobility, which can store lithium ions at low temperature, for example, their theoretical specific capacities are 433 mAh/g and 490 mAh/g respectively. Under this condition, the cycle times of the battery are reduced from 420 to 200, and the capacity retention rate is increased from 59% to 68%. (3) New materials are used to maximize the cold resistance of the powerwall home battery. The cathode matrix can be modified with new materials such as PI, PET, NCM, etc.

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