A non-aqueous electrolyte of a high-nickel ternary lithium ion battery and a high-nickel ternary lithium ion battery containing the electrolyte

A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion batteries, can solve problems such as SEI film rupture or gradual dissolution, lower cycle performance of lithium-ion batteries, separation of positive and negative electrodes and diaphragms, etc., to improve internal power Chemical properties, avoiding intragranular cracks, and reducing the effect of dissolution

Active Publication Date: 2019-01-11
DONGGUAN SHANSHAN BATTERY MATERIALS
View PDF9 Cites 20 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the charge and discharge progress, the negative electrode active material will repeatedly expand and contract, which may cause the SEI film to rupture or gradually dissolve, and the active sites on the exposed negative electrode material continue to react with the electrolyte to form new SEI

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A non-aqueous electrolyte of a high-nickel ternary lithium ion battery and a high-nickel ternary lithium ion battery containing the electrolyte
  • A non-aqueous electrolyte of a high-nickel ternary lithium ion battery and a high-nickel ternary lithium ion battery containing the electrolyte
  • A non-aqueous electrolyte of a high-nickel ternary lithium ion battery and a high-nickel ternary lithium ion battery containing the electrolyte

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0035] Example 1

[0036] Electrolyte preparation steps: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate in a mass ratio of EC: DEC: EMC = 3:3:4, and then add to the mixed solution Slowly add 12.5% ​​by weight of lithium hexafluorophosphate, and finally add 0.5% by weight based on the total electrolyte weight of the phosphate compound represented by the structure of formula (I) (specifically as shown in the list), and stir well to obtain the lithium ion battery of Example 1 Electrolyte.

[0037] Inject the prepared lithium-ion power battery electrolyte into fully dried artificial graphite material / LiNi 0.6 Co 0.6 Mn 0.2 O 2 In the battery, after the battery is stored at 45°C, formed into a high-temperature jig, and sealed again, it is routinely divided.

[0038] 1) Battery cycle performance test at room temperature: At 25℃, charge the divided battery to 4.2V at 1C constant current and constant voltage, cut-off current 0.05C, and...

Example Embodiment

[0044] Example 2-9 and Comparative Example 1-5

[0045] As shown in Table 1, in Examples 2-9 and Comparative Examples 1-5, except that the composition ratio of each component of the electrolyte is added as shown in Table 1, the others are the same as in Example 1.

[0046] Table 1 The composition ratio of the electrolytes of Examples 1-9 and Comparative Examples 1-5

[0047]

[0048]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a non-aqueous electrolyte of a high-nickel ternary lithium ion battery and a high-nickel ternary lithium ion battery containing the electrolyte, which relates to the technicalfield of lithium ion batteries. The high nickel ternary lithium ion battery electrolyte comprises an electrolyte lithium salt, a non-aqueous organic solvent and a film forming additive. The film forming additive comprises vinyl sulfate and a phosphate ester compound having a structure of formula (I), optionally further comprising a conventional negative electrode film forming additive. The phosphate ester additive can form a protective film on the surface of the positive electrode material, thereby avoiding the generation of cracks in the NCM particles during the circulation process, reducingthe dissolution of transition metal elements at high temperature, and improving the normal temperature circulation performance, high temperature circulation performance and high temperature storage performance of the battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-nickel ternary lithium-ion battery non-aqueous electrolyte and the high-nickel ternary lithium-ion battery of the electrolyte. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles and other fields due to their advantages such as high working voltage, high energy density, long life, wide working temperature range and environmental friendliness. Especially in the 3C digital field, in recent years, mobile electronic devices, such as smart phones, have become lighter and thinner, which has put forward higher requirements for the energy density of lithium-ion batteries. [0003] In order to improve the energy density of lithium-ion batteries, a common measure is to use high-voltage positive electrode active materials, but the positive electrode material will have certain defects under high voltage, and th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 潘立宁刘津宏朱学全郭力黄慧聪
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products