Non-aqueous electrolyte solution for lithium secondary battery and lithium secondary battery having the same
A non-aqueous electrolyte, lithium secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, non-aqueous electrolyte, secondary batteries, etc., can solve the problem that the SEI film cannot be guaranteed, and achieve improved cycle performance, less damage, and longer battery life The effect of longevity
Active Publication Date: 2011-04-13
LG ENERGY SOLUTION LTD
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Problems solved by technology
However, these methods cannot ensure the robustness of the SEI film, so the conventional problem remains unsolved
Method used
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Effect test
Embodiment 1
[0056] LiPF 6 Add ethylene carbonate (EC), diethyl carbonate (DEC) and propylene carbonate (PC) in a volume ratio of 2:7:1 to prepare a 1M LiPF 6 solution. Then, based on 100 parts by weight of non-aqueous electrolyte solution, 1 part by weight of 1,3-(1-propylene) sultone (PRS), 1 part by weight of vinyl ethylene carbonate (VEC), 5.38 parts by weight of fluorinated Ethylene carbonate (FEC) and 1 weight part of succinic nitrile (SN), thereby preparing a kind of non-aqueous electrolyte solution.
Embodiment 2
[0058] A nonaqueous electrolyte solution was prepared in the same manner as in Example 1 except that a 1:1 mixture of diethyl carbonate and ethylmethyl carbonate was used instead of diethyl carbonate.
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A non-aqueous electrolyte solution for a lithium secondary battery includes a lithium salt and an organic solvent. Based on 100 parts by weight of the non-aqueous electrolyte solution, the non-aqueous electrolyte solution includes 1 to 5 parts by weight of sultone-based compound having a carbon-carbon unsaturated bond in a cyclic structure; 1 to 5 parts by weight of cyclic carbonate compound with a vinyl group; 5 to 10 parts by weight of cyclic carbonate compound that is substituted with halogen; and 1 to 5 parts by weight of dinitrile-based compound. This non-aqueous electrolyte solution improves stability of a SEI film formed on a surface of an anode of a lithium secondary battery and thus improves normal temperature cycle performance and high temperature cycle performance.
Description
technical field [0001] The invention relates to a non-aqueous electrolyte solution for a lithium secondary battery and a lithium secondary battery containing the non-aqueous electrolyte solution. More specifically, the present invention relates to a nonaqueous electrolytic solution having excellent cycle performance and overcharge stability and a lithium secondary battery containing the nonaqueous electrolytic solution. Background technique [0002] With the recent rapid development of the information communication industry, electronic devices have become smaller, lighter, thinner and more portable. Therefore, demands for batteries with higher energy density as driving power sources for electronic devices are increasing. Among such batteries, a lithium secondary battery satisfies such a requirement, and various studies for improvement thereof are being actively conducted. A lithium secondary battery includes a cathode, an anode, an electrolyte, and a separator that provide...
Claims
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IPC IPC(8): H01M10/40H01M10/36
CPCY02E60/122H01M10/0568H01M4/587H01M10/0567H01M2300/0034H01M10/0569H01M4/525H01M2300/0025H01M10/0525Y02E60/10H01M10/052H01M10/0566
Inventor 朴昭映姜熙京裴峻晟
Owner LG ENERGY SOLUTION LTD
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