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Application of compound, non-aqueous electrolyte, and lithium ion secondary battery

A non-aqueous electrolyte and compound technology, used in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve the problem of insufficient wide temperature performance of lithium-ion batteries, unsatisfactory battery stability research results, and no Research on long-term cycle characteristics of batteries, etc., to achieve the effects of excellent discharge load characteristics, low internal resistance, and inhibition of gas generation

Active Publication Date: 2020-05-08
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the above-mentioned patent application has improved certain performances of the lithium-ion secondary battery to a certain extent, it is difficult to take into account the high and low temperature performance of the battery, and it has not solved the problem of gas generation during the charging and discharging process of the battery, and has not addressed the long-term performance of the battery. Cycle characteristics are studied
[0005] Therefore, the wide temperature performance of commercial lithium-ion batteries is still not enough to meet people's needs, and the research results on battery stability are still not ideal.

Method used

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  • Application of compound, non-aqueous electrolyte, and lithium ion secondary battery
  • Application of compound, non-aqueous electrolyte, and lithium ion secondary battery
  • Application of compound, non-aqueous electrolyte, and lithium ion secondary battery

Examples

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Embodiment 1

[0078] This embodiment provides a lithium-ion secondary battery, the preparation process of which is as follows:

[0079] (1) Preparation of positive electrode sheet of lithium secondary battery

[0080] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.6 co 0.2 mn 0.2 o 2 ), the conductive agent Super-P, and the binder PVDF are dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96:2.0:2.0 and mixed evenly to make a positive electrode slurry, and then the positive electrode slurry is evenly coated on the current collector aluminum foil , coating amount is 0.018g / cm 2 , followed by drying at 85°C, cold pressing, trimming, cutting, and stripping, and then drying at 85°C for 4 hours under vacuum conditions, welding the tabs, and making a positive electrode sheet of a lithium secondary battery that meets the requirements.

[0081] (2) Preparation of the negative electrode sheet of the lithium secondary battery

[0082] Negative...

Embodiment 2～4

[0089] Embodiments 2 to 4 provide a lithium-ion secondary battery. The preparation method of the positive and negative plates of the lithium-ion secondary battery and the lithium-ion battery is the same as that of Example 1, and the preparation method of the electrolyte is also the same as that of Example 1, except that The difference is that in the electrolyte, the mass of lithium sulfate (I-1) containing hydroxyl lithium has different percentages in the total mass of the electrolyte.

[0090] In Example 2, the mass of lithium sulfate (I-1) containing hydroxyl lithium accounts for 0.1% of the total mass of the electrolyte.

[0091] In Example 3, the mass of lithium sulfate (I-1) containing hydroxyl lithium accounts for 0.3% of the total mass of the electrolyte.

[0092] In Example 4, the mass of lithium sulfate (I-1) containing hydroxyl lithium accounts for 1% of the total mass of the electrolyte.

Embodiment 5

[0094] Embodiment 5 provides a kind of lithium ion secondary battery, the difference with the preparation method of the lithium ion secondary battery of embodiment 1 is that the solvent is cyclic fluoroethylene carbonate (FEC) and ethylene carbonate (EC) Mix with dimethyl carbonate (DMC) in mass ratio FEC:EC:DMC=3:1:2, and the rest of the steps and raw materials are the same as in Example 1.

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Abstract

The invention relates to application of a compound, a non-aqueous electrolyte and a lithium ion secondary battery. The electrolyte containing the compound with the structure as shown in the formula Ior the formula II can be used for a long time in a wide temperature range, is used in the lithium ion secondary battery, can remarkably improve the charging and discharging performance and the cycle index of the battery at different temperatures, can reduce the expansion of the battery after high-temperature shelving, and can reduce the internal resistance rise of the battery under low-temperaturestorage.

Description

technical field [0001] The invention relates to the field of lithium ion energy storage devices, in particular to application of compounds, nonaqueous electrolyte and lithium ion secondary battery. Background technique [0002] Lithium-ion secondary batteries have the characteristics of high energy density, high power density, long cycle life, no memory effect, and environmental protection. In recent years, fossil fuels have been gradually exhausted, especially in order to prevent the global warming effect, reducing carbon dioxide emissions has become a top priority, and the development of electric vehicles powered by lithium batteries has become one of the trends and directions of the development of the automotive industry. [0003] The moving distance of the car is long and the range of use is wide. In order to adapt to the use in different environments, the lithium-ion power battery used in the car is required to ensure that its electrochemical characteristics will not de...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 洪广宁李帅龙义丽玲周邵云
Owner GUANGZHOU TINCI MATERIALS TECH
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