Nonaqueous electrolyte solution and lithium secondary battery using same
一种锂二次电池、非水电解液的技术，应用在电解液领域，能够解决没有氟化链状碳酸酯、改善锂离子电池充放电循环特性等问题，达到抑制膨胀、实现高容量化、提高充放电循环特性的效果
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Embodiment 1
[0084] Using non-aqueous electrolytic solution No. 1 in Table 1, a cycle test and a battery swelling test were performed as follows. The results are shown in Table 2.
[0085] 1. Cyclic test
[0086] A coin-type battery was produced in the following procedure, and the discharge capacity at the 1st cycle and the discharge capacity retention rate (%) at the 20th cycle were measured.
[0087] (1) Production of A1 negative electrode
[0088] Aluminum foil with a thickness of 20 μm was punched into a coin shape with a diameter of 14 mmΦ, and vacuum-dried at 100° C. for 2 hours to make a coin-shaped negative electrode. In the coin-shaped negative electrode, the aluminum element is the negative electrode active material. When the negative electrode is charged and discharged at 1.5 to 0 V using metallic lithium as a counter electrode, the charge and discharge capacity of lithium is 7.5 mAh.
[0089] (2) Production of positive electrode
[0090] Hybrid LiCoO 2 (trade name: HLC-22...
Embodiment 2
[0120] Except having changed the nonaqueous electrolyte solution to the nonaqueous electrolyte solution No. 2 described in Table 1, it carried out similarly to Example 1, and performed the cycle characteristic and the swelling test of a battery. The results are shown in Table 2.
Embodiment 3～15、 comparative example 1～5
[0122] Similarly, batteries were produced using the non-aqueous electrolyte solutions No. 3-20 in Table 1, and the cycle characteristics and battery swelling tests were performed on Examples 3-15 and Comparative Examples 1-5. The results are shown in Table 2.
[0123] Table 2
[0124]
Non-aqueous electrolyte No.
1 cycle discharge capacity [mAh]
Cycle capacity maintenance rate [%]
Battery expansion after charging [ml]
Battery expansion after high temperature storage [ml]
Example 1
1
3.4
60
0.03
0.41
Example 2
2
3.3
55
0.02
0.32
Example 3
3
3.3
50
0.02
0.15
Example 4
4
3.4
45
0.01
0.09
Example 5
5
3.3
40
0.01
0.07
[0125] Example 6
6
3.5
30
0.02
0.05
Example 7
7
3.4
20
0.02
0.04
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