Electrode and battery having the same
A technology of electrodes and current collectors, applied in the field of non-aqueous electrolyte secondary batteries, can solve the problems of reduced cycle performance and reduced conductivity, and achieve the effects of increased capacity, improved peel strength, and high capacity
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Embodiment 1-1 to 1-9
[0108] Various copolymers prepared by changing the copolymerization ratio of VDF and mono-n-butyl maleate as shown in Table 1 were used as binders. In this copolymer, the substituent R1 of the monomer (1) is an n-butyl group having 4 carbon atoms.
[0109]
[0110] It is clear from the above Table 1 that in the Examples, by increasing the copolymerization ratio of the maleic acid ester, the peel strength can be increased and the cycle performance can be improved. In the comparative example, it can be seen that the rate of structural change is high; and compared with Examples 1-5, the cycle performance and peel strength in the comparative example are not improved. This is due to differences in comonomers.
Embodiment 2-1 to 2-4
[0112] The amount of binder added to the negative electrode was changed based on Examples 1-5. The obtained results are shown in Table 2.
[0113]
[0114] As is clear from Table 2 above, by making the bulkiness of the substituent of the maleic acid ester large, even if the amount of the adhesive used is reduced, the peel strength can be increased while maintaining the cycle performance. There is a possibility that when the composition of the active material layer is changed, a small amount can be used to express high peel strength.
Embodiment 3-1 to 3-12
[0116] The substituent of the comonomer or the kind of the comonomer was changed based on Examples 1-5. The results obtained are shown in Table 3.
[0117]
[0118] From Table 3 above, the following can be understood.
[0119] The structural change rate varies depending on the steric hindrance of the ester group of the copolymer, and as shown in Examples 3-4, the greater the steric hindrance (the greater the number of carbon atoms of the substituent), the smaller the structural change rate.
[0120] Regarding the peel strength, when a composition in which the softening point of the adhesive (copolymer) is lowered is introduced, the peel strength becomes large, and the peel strength after cycles is maintained. Compared with the ester groups (ie, methyl and ethyl groups) of Comparative Examples 1-2 and 1-3, when the number of carbon atoms in the substituent is 4 or more, the effect of greatly improving the peel strength can be exhibited. This is due to the effect that the s...
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