Lithium secondary battery exhibiting excellent performance
一种锂二次电池、电池模块的技术，应用在二次电池、二次电池制造、二次电池维修/保养等方向，能够解决电池安全问题、高运行电压、低电导率和理论容量等问题
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Embodiment 1
[0058] With the weight ratio of 90:5:5, Li as the negative electrode active material 1.33 Ti 1.67 o 4 , superconductive acetylene black (Denka black) as a conductive material, and PVdF as a binder were added to the NMP and mixed therein to prepare a negative electrode mixture. Subsequently, the negative electrode mixture was coated on a 20 μm Al foil, and the coated Al foil was pressed and dried, thereby achieving 6.6 mg / cm 2 The manufacture of the negative electrode.
[0059] In addition, LiNi as the positive electrode active material was used in a weight ratio of 90:5:5 0.5 mn 1.5 o 4 , superconductive acetylene black as a conductive material, and PVdF as a binder were added to the NMP and mixed therein to prepare a positive electrode mixture. Subsequently, the cathode mixture was coated onto a 20 μm Al foil, and the coated Al foil was pressed and dried, thereby achieving 8.6 mg / cm 2 The manufacture of the positive electrode.
[0060] An electrode assembly was fabric...
Embodiment 2
[0062] In addition to making 6.6mg / cm 2 The negative electrode and 7.8mg / cm 2 A lithium secondary battery was fabricated in the same manner as in Example 1 except for the positive electrode.
experiment example 1
[0066] The cutoff voltage of the secondary batteries manufactured according to Examples 1 and 2 and Comparative Example 1 was set to 3.5 V, and the negative electrode potential and positive electrode potential of each secondary battery were measured when the cutoff voltage was reached. The results are shown in Table 1 below.
[0067] [Table 1]
[0068]
[0069] With reference to table 1, in the secondary battery of embodiment 1 and 2, when reaching cut-off voltage, the potential of negative pole is 1.3V and 1.4V, and thus the potential of positive pole is 4.8V and 4.9V, therefore, when reaching the oxidation of electrolyte The potential of the positive electrode before the potential reaches the cut-off voltage. By comparison, in the secondary battery of Comparative Example 1, the potential of the negative electrode was 1.55 V when the cut-off voltage was reached, whereby the potential of the positive electrode was 5.05 V and thus reached the oxidation potential of...
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