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Non-aqueous electrolytic solution additive for lithium secondary battery, and non-aqueous electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same

A lithium secondary battery and non-aqueous electrolyte technology, applied in secondary batteries, non-aqueous electrolytes, lithium batteries, etc., can solve the problems of lithium ion consumption, increase of negative electrode interface resistance, resistance increase, etc., and achieve expansion characteristics and capacity characteristics The effect of improving and reducing the amount of metal impurities

Pending Publication Date: 2021-11-19
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] As mentioned above, when the amount of metal impurities in the battery increases, the metal impurities may be redeposited on the positive electrode to cause an increase in the resistance of the positive electrode, or conversely, may be transferred to the negative electrode through the electrolyte solution, and then electrodeposited on the negative electrode and grow into dendrites, which eventually cause a short circuit inside the battery
In addition, metal impurities are known to be factors that consume lithium ions or increase the interfacial resistance of the anode while promoting additional electrolyte solution decomposition reactions by destroying the SEI that imparts passivation capabilities to the anode
[0012] Therefore, there is a need to develop a non-aqueous electrolyte solution with a new composition, which can prevent low-voltage failure and the resulting reduction in battery life by inhibiting the dissolution of positive transition metals when the battery is operated under high-voltage and high-temperature conditions.

Method used

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  • Non-aqueous electrolytic solution additive for lithium secondary battery, and non-aqueous electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same
  • Non-aqueous electrolytic solution additive for lithium secondary battery, and non-aqueous electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same
  • Non-aqueous electrolytic solution additive for lithium secondary battery, and non-aqueous electrolytic solution for lithium secondary battery, and lithium secondary battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0122] (Preparation of non-aqueous electrolyte solution for lithium secondary battery)

[0123] 1g of the compound represented by formula 1a was added into the dissolved 1.2M LiPF 6 In the 99g non-aqueous organic solvent (ethylene carbonate (EC): propyl propionate (PP)=3:7 volume ratio), thus prepare lithium secondary battery non-aqueous electrolyte solution (see table 1 below).

[0124] (preparation of lithium secondary battery)

[0125] The cathode active material (LiCoO 2 ), conductive agent (carbon black) and binder (polyvinylidene fluoride) are added in N-methyl-2-pyrrolidone (NMP) with the weight ratio of 97.5:1:1.5 to prepare positive electrode slurry (solid matter: 50% by weight). A 12 μm-thick aluminum (Al) thin film as a positive electrode collector was coated with the positive electrode slurry, dried, and then rolled to prepare a positive electrode.

[0126] Negative active material (graphite), binder (SBR-CMC) and conductive agent (carbon black) were added into...

Embodiment 2

[0130] A nonaqueous electrolyte solution was prepared in the same manner as in Example 1, except that the compound represented by Formula 1b was included instead of the compound represented by Formula 1a during the preparation of the nonaqueous electrolyte solution (see Table 1 below). In addition, a lithium secondary battery including the nonaqueous electrolyte solution was prepared.

Embodiment 3

[0132]A nonaqueous electrolyte solution was prepared in the same manner as in Example 1, except that the compound represented by Formula 1c was included instead of the compound represented by Formula 1a during the preparation of the nonaqueous electrolyte solution (see Table 1 below). In addition, a lithium secondary battery including the nonaqueous electrolyte solution was prepared.

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Abstract

The present invention relates to: a non-aqueous electrolytic solution additive for a lithium secondary battery which forms a stable film on the surface of a positive electrode, and thus is able to suppress the elution of a transition metal; a non-aqueous electrolytic solution for a lithium secondary battery comprising same; and a lithium secondary battery which comprises the non-aqueous electrolytic solution, and thus suppresses the elution of metal impurities, which cause defects in the battery, and accordingly, exhibits enhanced swelling and capacity characteristics during storage at a high voltage and a high temperature.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to Korean Patent Application No. 10-2019-0045583 filed on April 18, 2019, the disclosure of which is incorporated herein by reference. technical field [0003] The present invention relates to a non-aqueous electrolyte solution additive for a lithium secondary battery, which can suppress the dissolution of transition metals by forming a stable film on the positive electrode surface, and also relates to a non-aqueous electrolyte solution for a lithium secondary battery containing the additive and lithium secondary batteries. Background technique [0004] With the recent development of the information society, personal IT equipment and computer networks have been developed, and society as a whole has become more dependent on electric energy, requiring the development of technologies that efficiently store and utilize electric energy. [0005] In particular, with the focus on solving env...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/052
CPCH01M10/0567H01M10/0525H01M2300/0025C07F7/081Y02E60/10H01M10/052H01M10/0568H01M10/0569H01M2300/0028
Inventor 李政旻林永敏李哲行
Owner LG ENERGY SOLUTION LTD