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Lithium secondary battery

A lithium secondary battery, lithium salt technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of low initial capacity, reduced battery life, high irreversible capacity, and achieve excellent life characteristics and thermal stability, negative electrode The effect of minimizing the occurrence of deterioration and the decrease in initial capacity

Pending Publication Date: 2020-08-07
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon-based materials suffer from low initial capacity and high initial resistance due to high irreversible capacity
In addition, there is a problem of reduced battery life due to volume expansion that occurs during charging and discharging
[0005] In addition, when a silicon-based negative active material is used together with a positive active material with a high nickel content, it is difficult to form a stable The problem of the film, thus accelerating the deterioration of the performance of the negative electrode

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] (Preparation of non-aqueous electrolyte solution)

[0085] By adding 2g of vinylene carbonate (VC) and 1g of propane sultone (PS) to 97g of which was dissolved 1.0MLiPF 6 and 1.0M lithium bis(fluorosulfonyl)imide in a non-aqueous organic solvent (a solvent mixture of ethylene carbonate and dimethyl carbonate mixed at a volume ratio of 1:9), to prepare a non-aqueous electrolyte solution.

[0086] (manufacturing of secondary batteries)

[0087] LiNi as the positive electrode active material 0.8 co 0.1 mn 0.1 o 2 (NCM811), Super-P as a conductive material, and polyvinylidene fluoride (PVdF) as a binder were added to N-methyl-2-pyrrolidone (NMP) at a weight ratio of 95:2:3 to A positive electrode slurry (solid content: 17% by weight) was prepared. A 20 μm thick positive electrode current collector (Al thin film) was coated with the positive electrode slurry, dried and rolled to produce a positive electrode.

[0088] Next, a mixture in which graphite and SiO were mixe...

Embodiment 2

[0091] A lithium secondary battery was manufactured in the same manner as in Example 1, except that 0.6M LiPF was dissolved by adding 2 g of vinylene carbonate (VC) and 1 g of propane sultone (PS) to 97 g 6 and 1.4M lithium bis(fluorosulfonyl)imide in a non-aqueous organic solvent (a solvent mixture of ethylene carbonate and dimethyl carbonate mixed at a volume ratio of 1:9), to prepare a non-aqueous electrolyte solution.

Embodiment 3

[0093] A lithium secondary battery was fabricated in the same manner as in Example 1, except that 0.5M LiPF was dissolved by adding 2 g of vinylene carbonate (VC) and 1 g of propane sultone (PS) to 97 g 6 and 1.5 M lithium bis(fluorosulfonyl)imide in a non-aqueous organic solvent (a solvent mixture of ethylene carbonate and dimethyl carbonate mixed at a volume ratio of 1:9), to prepare a non-aqueous electrolyte solution.

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Abstract

The present invention pertains to a lithium secondary battery comprising: a positive electrode containing a lithium-nickel-cobalt-manganese-based positive electrode active material having a nickel content of at least 80 mol% with respect to the total amount of transition metals; a negative electrode containing a silicon-based negative electrode active material; a separator; and a non-aqueous electrolytic solution containing a non-aqueous organic solvent and a lithium salt, wherein the concentration of the lithium salt is 1.8-5 M, and the lithium salt includes LiPF6 and lithium bis(fluorosulfonyl)imide.

Description

technical field [0001] The present invention relates to a lithium secondary battery, and more particularly, to a lithium secondary battery having high capacity characteristics and excellent life characteristics, electrochemical characteristics and stability. Background technique [0002] With growing interest in new renewable energy that can replace nuclear power and fossil fuels due to recent environmental concerns, the demand for secondary batteries, which have the ability to be charged and discharged for repeated use, has increased dramatically in new renewable energy. semi-permanent life characteristics. [0003] Among them, the lithium secondary battery has attracted the most attention due to its excellent life characteristics and high energy density. As cathode active materials, various lithium transition metal oxides have been developed, such as LiCoO 2 , LiNiO 2 , LiMnO 2 , LiMn 2 o 4 、LiFePO 4 , Li(Ni a co b mn c )O 2 (where a, b and c are the atomic frac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/38H01M4/485H01M4/58H01M10/0567H01M4/36H01M10/0525
CPCH01M10/0525H01M4/505H01M4/525Y02E60/10H01M4/364H01M4/386H01M10/0568H01M10/0569H01M4/485H01M4/58H01M10/0567H01M2300/0028H01M2004/027H01M2004/028H01M4/587H01M4/483
Inventor 申元景安庆昊李哲行吴正友金珉廷
Owner LG ENERGY SOLUTION LTD
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