Monaqueous liquid electrolyte for use in secondary battery, and lithium-ion secondary battery
A non-aqueous electrolyte, secondary battery technology, applied in secondary batteries, non-aqueous electrolytes, battery electrodes, etc., can solve the problem of insufficient rate characteristics of lithium-ion secondary batteries, and achieve safety and excellent rate characteristics. Effect
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[0285] Hereinafter, the present invention will be described in detail through examples, but the present invention is not limited to the following description. Examples 1 to 13 are examples, and examples 14 to 19 are comparative examples.
[0286] [Various measurement methods, evaluation methods]
[0287] (Measurement of Viscosity of Liquid Composition)
[0288] Viscosity was measured using a BM-type rotational viscometer (manufactured by Toki Sangyo Co., Ltd. (Toki Sangyo Co., Ltd., RE215H)) under conditions of No. 1 rotor, rotation speed 300 rpm, and 25°C.
[0289] (Measurement of lithium ion diffusion coefficient)
[0290] The lithium ion diffusion coefficient was calculated by the pulsed gradient field NMR method. For the pulsed gradient field NMR measurement, ECA-600 manufactured by JEOL Resonance Co., Ltd. (JEOL RESONANCE) was used. The self-diffusion coefficient D in the pulsed gradient field NMR method is given by the following formula in accordance with the attenua...
example 1
[0345] After dispersing LPF (0.30 g) as a lithium salt into HFE5510 (1.08 g) and AE3000 (0.61 g) as a fluoroether compound, GBL (0.69 g) as a cyclic carboxylate compound and ( β) DMC (0.30 g) was mixed to obtain a non-aqueous electrolytic solution 1 .
[0346] Table 1 shows the viscosity of the liquid composition, the lithium ion diffusion coefficient of the nonaqueous electrolytic solution, and the rate characteristics of the lithium ion secondary battery. Table 5 shows negative electrode reactivity and positive electrode reactivity.
example 2～19
[0348] Except having changed the composition of each compound, such as a lithium salt, like Table 1 - Table 4, it carried out similarly to Example 1, and obtained the nonaqueous electrolytic solution. The viscosity of the liquid composition, the lithium ion diffusion coefficient of the non-aqueous electrolytic solution, and the rate characteristics of the lithium ion secondary battery are shown in Tables 1-4. Table 5 shows negative electrode reactivity and positive electrode reactivity.
[0349] In addition, the mass % in Table 1-Table 4 is the ratio when the whole non-aqueous electrolytic solution is made into 100 mass %.
[0350] [Table 1]
[0351]
[0352] [Table 2]
[0353]
[0354] [table 3]
[0355]
[0356] [Table 4]
[0357]
[0358] [table 5]
[0359]
[0360] As shown in Tables 1 to 3, the diffusion coefficient of lithium ions is 1.1×10 -10 m 2 The rate characteristics of the lithium ion secondary batteries of Examples 1 to 13 of the nonaqueous ...
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