Flame retardant electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same
An electrolyte and lithium battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrodes of non-aqueous electrolyte batteries, etc. Effect
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Embodiment 1
[0158] Flame retardant electrolyte solution is composed of 9wt% LiPF 6 (1M concentration), 50wt% dimethyl carbonate (DMC), 20wt% ionic solution containing ammonium cation represented by the following chemical formula 32, 10wt% trimethyl phosphate (TMP), 1wt% LiFOB and 10wt % Fluoroethylene carbonate (FEC) preparation.
[0159] Chemical formula 32
[0160]
experiment example 1
[0169] Experimental example 1: Measuring the viscosity of the flame-retardant electrolyte solution
[0170] Each flame-retardant electrolyte solution prepared according to Example 1 and Comparative Examples 1 to 4 was measured to determine the viscosity. A rotational viscometer (digital) was used to measure the viscosity of each flame-retardant electrolyte solution by monitoring the stress change with frequency, and the viscosity was evaluated. The results are shown in Table 1 below.
experiment example 2
[0171] Experimental example 2: Measuring the flame retardancy of flame retardant electrolyte solution
[0172] Each flame retardant electrolyte solution prepared according to Example 1 and Comparative Examples 1 to 4 was measured to determine the flame retardancy. The flame retardancy of each flame retardant electrolyte solution was measured by the standard method of UL 94 flammability test to determine the degree of combustion in the flame burning test. The flammability test is carried out by the following steps: support 4 cm × 1 cm glass fiber with 0.5 g of electrolyte solution, make one end of it contact the fire source, observe whether it catches fire, and observe the duration of fire to determine the flame retardancy of the flame retardant electrolyte solution .
[0173] Table 1:
[0174]
Viscosity (cP)
Flame retardant
Example 1
5
Nonflammable
Comparative example 1
3.2
Flammable
Comparative example 2
3.4
Self-extinguishing
Comparative example 3
10.3
Nonfla...
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