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Electrolyte for lithium ion battery and lithium ion battery comprising same

A lithium-ion battery and electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as oxidative decomposition, accelerate electrolyte consumption, intensify SEI film decomposition and re-film formation, and achieve the effect of reducing dissolution and improving capacity retention

Inactive Publication Date: 2020-04-03
HIGHPOWER TECH HUIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, conventionally used electrolyte solvents are easily oxidatively decomposed on the surface of the positive electrode under high temperature conditions.
Moreover, the high temperature condition further aggravates the decomposition and re-filming of the SEI film (Solid Electrolyte Interphase), while generating high-impedance by-products, it continuously accelerates the consumption of the electrolyte, thereby causing a great impact on the performance of the lithium-ion battery. Negative impact

Method used

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  • Electrolyte for lithium ion battery and lithium ion battery comprising same
  • Electrolyte for lithium ion battery and lithium ion battery comprising same
  • Electrolyte for lithium ion battery and lithium ion battery comprising same

Examples

Experimental program
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Effect test

Embodiment 1

[0042] This embodiment provides an electrolyte solution for lithium-ion batteries, which includes, based on the total weight of the electrolyte solution: the first additive (select the compound shown in formula (III)) 1wt%, the second additive (select the compound shown in formula (IX) compound) 0.5 wt%. The lithium salt in the electrolyte is lithium hexafluorophosphate, and its concentration is 1.2 mol / L. The weight ratio of each solvent in the organic solvent used in the electrolyte is ethylene carbonate: propylene carbonate: diethyl carbonate: propyl propionate=20:20:25:35.

[0043] This embodiment also provides a secondary battery. The secondary battery is a lithium ion battery, including a positive electrode sheet, a negative electrode sheet, a diaphragm and the above-mentioned electrolyte solution for the lithium ion battery.

[0044] Wherein, the positive electrode sheet includes a positive electrode active material, a current collector, a conductive agent and a binde...

Embodiment 2

[0052] Float test

[0053] Adjust the type and content of the first additive and the second additive in Example 1 to obtain each case group, specifically refer to the following table, wherein, the types of the first additive and the second additive are shown in the aforementioned structural formulas:

[0054] Table 1. Comparison of additives in each group

[0055]

[0056] The above 16 kinds of batteries were subjected to a float charge test for 49 weeks in a 55°C incubator. The specific test method is as follows: Firstly, the battery is initialized at room temperature, and the initial capacity, thickness and internal resistance are recorded.

[0057] Tested in a constant temperature box at 55°C, (1) charge at a rate of 0.5C with constant current and constant voltage to full charge voltage, cut off current at 0.05C, and leave it for 22.8 hours; (2) discharge at a constant current of 0.05C for 60 minutes, and leave it for 10 minutes minute. The cycle time of this cycle is...

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Abstract

The invention provides an electrolyte for a lithium ion battery and a lithium ion battery comprising the same. The electrolyte for the lithium ion battery comprises an organic solvent, a lithium salt,a first additive and a second additive, wherein the first additive and the second additive respectively have structural formulas as shown in formulas (I) and (II). The oxidation potential of the first additive is lower than that of the organic solvent, a compact solid electrolyte phase interface film can be preferentially formed on the surface of the positive electrode through oxidative polymerization, oxygenolysis gas production is reduced, and consumption of active substances is reduced. Nitrogen atoms of the second additive can be effectively complexed with transition metal atoms with highvalence, and the interface impedance of the positive electrode is reduced to facilitate migration of lithium ions on the positive electrode interface, effectively reduce the oxidation activity of a positive electrode material to the electrolyte, especially the oxidation of the electrolyte under a high-temperature condition, further inhibit reduction and dissolution of transition metals caused bythe change of the structure of the positive electrode material, and improve the high-temperature performance of the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte solution for lithium ion batteries and a lithium ion battery containing the same. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high energy density, long cycle life and safety, and are currently the most widely used secondary batteries for 3C electronic products. However, with the progress and development of society, people have higher and higher requirements on the energy density and cycle life of lithium-ion batteries. For example, the current mainstream gaming notebook computer, with the improvement of configuration, the battery temperature of the computer is as high as 40°C or higher under the condition of high-load work. Therefore, improving the electrical performance of lithium-ion batteries for floating charge and storage at high temperatures is a major trend in the development of lithium-ion ...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 梁永鹏张昌明李枫杜冬冬
Owner HIGHPOWER TECH HUIZHOU
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