Lithium battery adhesive with three-dimensional structure and lithium battery negative electrode material containing it
A negative electrode material, lithium battery technology, applied in battery electrodes, negative electrodes, structural parts, etc., can solve problems such as excessive irreversible capacitance, poor cycle life, and negative electrode material pulverization, so as to improve industrial application value and reduce The effect of irreversible capacitance and prolonging cycle life
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preparation example Construction
[0087] For the adhesive of the present invention, its preparation method comprises the following steps:
[0088] (a) adding the polymer to the carrier to prepare the solution of step (a);
[0089] (b) Chitin is added to the step (a) solution to make the step (b) solution;
[0090] (c) will have aldehyde group (-CHO) and / or amine group (-NH 2 ) compound is added to the step (b) solution to prepare the step (c) solution;
[0091] For chitin, polymers, aldehyde groups (-CHO) and / or amine groups (-NH 2 ) compound, and the selection of the carrier is as described in the above paragraphs, and will not be repeated here.
[0092] For the aforementioned carrier, N-methylpyrrolidone (NMP), water or a combination thereof can be used. The selection of the carrier is adjusted according to the composition of the adhesive, so without compromising the effect of the adhesive, it can be selected according to the needs of each experiment without special restrictions. According to the adhesi...
Embodiment 1
[0133] Example 1 uses the adhesive of the present invention, the first Coulombic efficiency is 78.7%, which is not much different from Comparative Example 1 and Comparative Example 2, but the first reversible capacity is increased to 737mAh / g. The first reversible capacitance of Example 2 is 766mAh / g, which is about 50mAh / g higher than that of Comparative Example 1 and Comparative Example 2. Moreover, the Coulombic efficiency even reached 80.8% for the first time. Example 3 is to improve the experimental conditions of Example 2 to obtain the adhesive of the present invention. Its first reversible capacity and Coulombic efficiency are 765mAh / g and 81.4%, respectively, which are similar to Example 2, but are full The capacity retention rate after 100 discharges is 70%, compared to only 59% for sample 2 after 100 charges and discharges.
[0134] From the above results, it can be seen that the adhesive with a three-dimensional network structure can not only improve the bonding an...
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