Ternary positive electrode material lithium ion battery electrolyte

A technology for lithium-ion batteries and positive electrode materials, which is applied in secondary batteries, circuits, electrical components, etc., can solve the problem that the electrolyte is difficult to take into account the cycle performance of capacity batteries, so as to improve battery capacity and cycle performance, improve high-temperature cycle performance, The effect of long cycle times

Inactive Publication Date: 2017-08-18
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a ternary positive electrode material lithium-ion battery electrolyte, which solves the technical problem that the electrolyte in the prior art is difficult to take into account the capacity, internal resistance and cycle performance of the battery.

Method used

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  • Ternary positive electrode material lithium ion battery electrolyte
  • Ternary positive electrode material lithium ion battery electrolyte
  • Ternary positive electrode material lithium ion battery electrolyte

Examples

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Effect test

Embodiment 1

[0025] In this embodiment, the ternary positive electrode material lithium ion battery electrolyte is made up of carbonate organic solvent, lithium salt, additive, and wherein carbonate organic solvent is made of EC, DEC, EMC, PC according to mass ratio is 20:35: Mixed at 35:10, the additive is composed of 1% VC, 5% FEC, 2% PST, 1% TMSP, 1% LiBOB, which account for the total mass of lithium salt and carbonate organic solvent. It is filled with argon In the glove box of gas, configure the carbonate organic solvent, after stirring evenly, slowly add LiPF6 which accounts for 12% of the total mass of the lithium salt and the carbonate organic solvent, and finally add various additives in turn, after stirring evenly, the lithium salt of Example 1 is obtained. Ion battery electrolyte.

Embodiment 2

[0027] In this embodiment, the ternary positive electrode material lithium-ion battery electrolyte is composed of carbonate organic solvent, lithium salt, and additives, wherein the carbonate organic solvent is composed of EC, DEC, EMC, and PC in a mass ratio of 20:40: 35:5 mixed, the additive is composed of 5% VC, 10% FEC, 5% MMDS, 3% TMSB, and 5% LiODFB, which account for the total mass of lithium salt and carbonate organic solvent. It is filled with argon In a gas-filled glove box, configure a carbonate-based organic solvent. After stirring evenly, slowly add LiPF6 that accounts for 18% of the total mass of lithium salt and carbonate-based organic solvent. Finally, add various additives in turn. After stirring evenly, the lithium ion of Example 2 is obtained. battery electrolyte.

Embodiment 3

[0029] In this embodiment, the ternary positive electrode material lithium ion battery electrolyte is made up of carbonate organic solvent, lithium salt, additive, and wherein carbonate organic solvent is made of EC, DEC, EMC, PC according to mass ratio is 20:35: Mixed at 35:10, the additives are 2.5% VC, 7% FEC, 3.5% PST, 2% TMSP, 3% LiBOB, which account for the total mass of lithium salt and carbonate organic solvent, and are filled with argon In a gas-filled glove box, configure a carbonate organic solvent, and after stirring evenly, slowly add LiPF6 that accounts for 14% of the total mass of the lithium salt and the carbonate organic solvent, and finally add various additives in turn, and obtain the lithium ion of Example 3 after stirring evenly. battery electrolyte.

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Abstract

The invention provides a ternary positive electrode material lithium ion battery electrolyte, and relates to the technical field of a lithium ion battery. The ternary positive electrode material lithium ion battery electrolyte comprises a carbonate ester organic solvent, a lithium salt and an additive, wherein the lithium salt is lithium hexafluorophate, the lithium hexafluorophate accounts for 12-18% of the total mass of the lithium salt and the carbonate ester organic solvent, and the additive accounts for 5-15% of the total mass of the lithium salt and the carbonate ester organic solvent. The carbonate ester organic solvent is used, so that the solvent is high in solubility of the lithium salt and low in viscosity; and meanwhile, fluoroethylene carbonate is used as a low-temperature additive, the electrolyte is compatible with the electrochemical performance such as capacity and internal resistance, the ternary positive electrode material battery also has excellent cycle property, and the cycle time of the battery under a low-temperature condition is prolonged.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, and relates to a ternary cathode material lithium ion battery electrolyte. Background technique [0002] With the increasing demand for the specific energy density of lithium-ion batteries, ternary cathode materials with low cost, high voltage, and high gram capacity are more and more widely used in lithium-ion batteries, especially power lithium-ion batteries. However, ternary cathode materials Strong water absorption, especially at high voltage and high nickel content, greatly accelerates the decomposition process of conventional electrolytes, resulting in severe gas swelling and poor cycle performance, so the development of ternary materials that can effectively improve the cycle performance of batteries Functional electrolytes are imminent. [0003] In the existing technology, there are many related studies on improving the cycle performance of ternary material batteries. The m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567
CPCH01M10/0567Y02E60/10
Inventor 梁大宇黄梅包婷婷
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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