lithium secondary battery
A lithium secondary battery, electrolyte technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of low capacity, reduced output, and high production costs
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preparation example 1
[0061] A negative electrode for a lithium secondary battery was prepared by using assembled artificial graphite satisfying the physical properties described in Table 1 below.
[0062] In detail, an assembled artificial graphite satisfying the physical properties listed in Table 1 was prepared, and the binder was a water-based binder mixed with styrene-butadiene rubber (SBR) and carboxymethyl at a weight ratio of 5:5. Cellulose (CMC) was prepared, and carbon black was prepared as a conductive material.
[0063] After mixing the prepared negative electrode active material, binder, and conductive material in a weight ratio of 93:2:5, they were dispersed in water, thereby preparing negative electrode slurry. After coating the negative electrode slurry above on the copper film, it was dried and rolled at a pressure of 3.8 MPa to prepare a secondary battery negative electrode.
preparation example 2～6 and comparative preparation example 1～4
[0065] A negative electrode for a lithium secondary battery was prepared in the same manner as in Preparation Example 1 using artificial graphite satisfying the physical properties described in Table 1 below.
[0066] Table 1
[0067]
Embodiment 1～6 and comparative example 1～5
[0069] Use the negative electrodes for lithium secondary batteries prepared in Preparation Examples 1-3 and Comparative Preparation Examples 1-3; satisfy the composition of the following Table 2 and include 1M LiPF 6 The electrolyte solution and the two poles of nickel-cobalt-aluminum (NCA) system, and the lithium secondary battery was prepared in a conventional method, and the characteristics of the prepared lithium secondary battery were recorded in Table 3.
[0070] Table 2
[0071]
[0072] table 3
[0073]
[0074]
[0075] As shown in Table 3, in the case of Examples 1-5 using the negative electrode and the electrolyte, the above-mentioned negative electrode is prepared by using assembled artificial graphite with an average pore diameter of 80 nm to 150 nm, and the viscosity of the above-mentioned electrolyte is 5.0 cP After 700 times of charging and discharging tests, it maintains a capacity of more than 91.8%, which has excellent life characteristics. After b...
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