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High-voltage electrolyte and lithium ion battery containing same

An electrolyte and high-voltage technology, applied in the field of lithium-ion batteries, can solve the problems that affect the conductivity of the electrolyte, the interaction between the electrode and the electrolyte interface, the amount of addition, and the failure to achieve it. It achieves excellent cycle performance, low conductivity, The effect of high viscosity

Pending Publication Date: 2020-05-01
安普瑞斯(无锡)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of ordinary nitriles and sultone compounds will not have obvious effects, and the addition of too much will affect the conductivity of the electrolyte and the interface between the electrode and the electrolyte.

Method used

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  • High-voltage electrolyte and lithium ion battery containing same
  • High-voltage electrolyte and lithium ion battery containing same
  • High-voltage electrolyte and lithium ion battery containing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Preparation of electrolyte steps: In a glove box filled with argon, mix ethylene carbonate, propylene carbonate, and propyl propionate at a mass ratio of 2:1:3, and then slowly add 1.2 mol / L of lithium hexafluorophosphate and 0.1mol / L lithium bisfluorosulfonimide, and finally add 4% fluoroethylene carbonate based on the total mass of the electrolyte, 3% 1-fluoro, 2-propionitrile, 3-cyano-1 , 3-propane sultone and 0.5% ethylene carbonate, and stir evenly to obtain the high-voltage lithium-ion battery electrolyte of Example 1.

[0024] The preparation steps of the positive electrode sheet: in the NMP solvent LiCoO 2 Mix evenly with conductive agent (carbon black) and binder (PVDF) in a weight ratio of 98:1:1, and vacuum stir to make positive electrode slurry; apply the slurry evenly on 10 μm aluminum foil to prepare electrode sheet; the electrode sheet was dried at 130°C, and rolled into strips to obtain the positive electrode sheet.

[0025] The preparation steps of t...

Embodiment 2-8

[0035] In Examples 2-8, except that the content of each component of the electrolyte is added as shown in Table 1, the rest are the same as in Example 1. Table 1 is the content table of each component of the electrolyte of embodiment 1-8 and the electrical performance test result:

[0036] Table 1

[0037]

[0038] In the above Table 1, the abbreviated names of each chemical substance are as follows:

[0039] EC (ethylene carbonate), DEC (diethyl carbonate), PP (propyl propionate), LiFSi (lithium bisfluorosulfonyl imide), LiPF 6 (lithium hexafluorophosphate), FEC (fluoroethylene carbonate), VEC (ethylene carbonate).

[0040] Comparing Examples 1 and 2, it can be seen that: fluorodicyano sultone is slightly worse than that of succinonitrile and 1,3-propane sultone alone at room temperature and 45 degrees 0.7C cycle capacity retention rate is slightly worse, 85 degrees C After storage for 6 hours, the battery expansion is larger, and the capacity retention and recovery rate ...

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Abstract

The invention relates to a high-voltage electrolyte and a lithium ion battery containing the same. The high-voltage electrolyte comprises components of non-aqueous organic solvent, electrolyte lithiumsalt, fluoroethylene carbonate, fluorodicyanosultone compound and additive, the fluoroethylene carbonate accounts for 1-10% of the total mass of the electrolyte, the fluorodicyanosultone compound accounts for 0.1-8% of the total mass of the electrolyte, the fluoroethylene carbonate can form a compact, flexible and low-impedance SEI film on a surface of a negative electrode, and can reduce the surface tension of the electrolyte and improve oxidation resistance of the electrolyte at high voltage, the fluorodicyanosultone compound enables a crystal structure of a positive electrode material to be more stable, and compatibility of an electrode and an electrode liquid interface is improved. The high-voltage electrolyte is for a 4.4 V and above high-voltage lithium ion secondary battery, can solve problems of compatibility and high-temperature storage of the electrode and the electrolyte interface, and is good in cycle performance.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-voltage electrolyte and a lithium ion battery containing the electrolyte. Background technique [0002] Lithium-ion secondary batteries have become the most widely used secondary batteries due to their advantages of high voltage and high energy density. However, with the continuous development of miniaturization, multi-function and long-term standby of portable devices such as smartphones, drones and smart wearables, especially the arrival of the 5G era, the energy density of general lithium-ion secondary batteries, especially the volume energy The density simply cannot meet the needs of consumers. At present, the maximum energy density of the commercial 4.4V lithium-ion battery system is about 700Wh / L, and the 4.45V system is about 720-730Wh / L, but it is still difficult to meet the requirements of consumers. [0003] At present, most of the ways to increase energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 张勇徐子福张明慧
Owner 安普瑞斯(无锡)有限公司