An electrochemical energy storage device
An energy storage device and electrochemical technology, applied in the field of electrochemistry, can solve problems such as threats to people's life and property safety, fire and explosion, and achieve the effect of improving overcharge safety performance and preventing thermal runaway
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[0037] In the present invention, the method for preparing an electrochemical energy storage device (for example, lithium ion battery) should be known to those skilled in the art, for example, a positive electrode active material layer can generally include a positive electrode active material, a binder, a conductive agent, etc., the preparation method of the positive electrode sheet may specifically include the following steps: After forming a slurry of the bonding substance, the conductive substance and the overcharge sensitive substance, coating it on the positive electrode current collector to provide a positive electrode current collector loaded with a safety layer ; After mixing the positive electrode active material, binder and conductive agent to form a slurry, apply it on the safety layer. For another example, the negative electrode active material layer can generally include negative electrode active materials, binders, conductive agents, etc., and the preparation meth...
Embodiment 1~31
[0042] Preparation of positive electrode sheet:
[0043] Make the safety layer slurry: take the bonding material, conductive material, and overcharge sensitive material and place them in a planetary stirring tank, then add N-methylpyrrolidone (NMP) 9 times the total weight of the above materials as a dispersion solvent, and stir rapidly for 5 hour to form a uniform and stable slurry. The selection and proportioning of the selected bonding material, conductive material, and overcharge-sensitive material are shown in Table 1. The total mass of the conductive substance and the overcharge-sensitive substance is calculated, and the corresponding percentage content of each substance is the value in Table 1 × 100% (for example, 1 corresponds to 100%, and 0.35 corresponds to 35%). The overcharge sensitive substance parameters used are as follows:
[0044] For the "carbonate of glucose and sucrose mixture" in Examples 1-14 and Comparative Example 1, the ratio of sucrose to glucose is ...
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