Battery cell, symmetrical battery and application thereof
A technology of symmetrical batteries and cells, applied in the field of lithium-ion batteries, can solve problems such as poor consistency and inability to accurately test and evaluate lithium-ion batteries
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Embodiment
[0082] This embodiment provides a symmetrical battery, which is prepared by the following method:
[0083] step 1):
[0084] An aluminum foil material is selected as the current collector, one surface of the aluminum foil material is composed of a coating area and an empty foil area, and an electrode coating is applied in the coating area to obtain a pole piece.
[0085] Wherein, the length and width of the coating area are both 50mm. The length of the empty foil area is 48 mm and the width is 10 mm, and both ends of the length direction of the empty foil area are 1 mm shorter than the coated area. The electrode coating is composed of lithium nickel cobalt manganate (LiNi) with a mass ratio of 96:2:2. 0.8 Co 0.1 Mn 0.1 O 2 ), conductive carbon black and polyvinylidene fluoride, and the surface density of the electrode coating is 18 mg / cm 2 , the compaction density of the electrode coating is 3.4 g / cm 3 .
[0086] Step (2):
[0087] The electrode coatings of the two po...
experiment example 1
[0095] Carry out EIS test to the symmetrical battery provided by embodiment and comparative example respectively, the EIS result of embodiment is as follows Figure 5 As shown, the EIS results of the comparative example are as follows Image 6 shown. in, Figure 5 P-1(1), P-1(2) and P-1(3) respectively represent three symmetrical batteries prepared in parallel according to the examples, and the comparison Image 6 S-1(1), S-1(2) and S-1(3) in the above represent three symmetrical cells prepared in parallel according to the comparative example, respectively. EIS test method: The prepared fresh homogenous pole pieces were prepared according to the schemes of the examples and the comparative examples to make a symmetrical battery, and allowed to stand at 25 ° C for 12 hours, and then the EIS test was carried out using an electrochemical workstation. The frequency of the disturbance AC was 1Hz-100kHz. The amplitude is 5mV.
[0096] from Figure 5 It can be seen that the Nyqui...
experiment example 2
[0100] Symmetrical batteries P-1, P-2 and P-3 were prepared with reference to the methods for preparing symmetrical batteries provided in the examples, respectively. The difference between symmetrical batteries P-1, P-2 and P-3 is that the areal densities of the electrode coatings are different. ; The surface densities of electrode coatings of P-1, P-2 and P-3 are 18 mg / cm, respectively 2 , 20mg / cm 2 and 22mg / cm 2 , that is, the thickness of the electrode coatings of P-1, P-2 and P-3 increases sequentially. Using the same test method as in Experimental Example 1, EIS tests were carried out on P-1, P-2 and P-3 respectively. The test results are as follows Figure 7 shown.
[0101] from Figure 7 It can be seen that the values of the Nyquist curves of P-1, P-2 and P-3 are basically the same at the starting point of the horizontal axis, indicating that the thickness of the electrode coating on the pole piece is changed, and the ohmic internal resistance R s value has littl...
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Abstract
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