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Positive electrode lithium supplementing material, positive electrode plate containing positive electrode lithium supplementing material and electrochemical device

A technology of positive pole piece and lithium supplementation, applied in the field of electrochemistry, can solve the problems of performance attenuation, slurry gelation, storage flatulence, etc.

Pending Publication Date: 2022-02-25
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of free lithium on the surface of this kind of material is extremely high, and it is easy to cause the gel of the slurry during the slurry mixing process, which seriously affects the processing performance.
Moreover, extremely high free lithium content will greatly deteriorate the high-temperature storage performance of lithium-ion secondary batteries, resulting in storage flatulence and performance attenuation

Method used

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  • Positive electrode lithium supplementing material, positive electrode plate containing positive electrode lithium supplementing material and electrochemical device
  • Positive electrode lithium supplementing material, positive electrode plate containing positive electrode lithium supplementing material and electrochemical device
  • Positive electrode lithium supplementing material, positive electrode plate containing positive electrode lithium supplementing material and electrochemical device

Examples

Experimental program
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Effect test

Embodiment 1

[0068]

[0069] NiO and Li 2 O was mixed in argon at a mass ratio of 1:1, and ball milled for 24 hours to obtain a mixture. The mixture is compressed into pellets. Put the pellets into a nickel tube filled with argon and heat at 650 °C for 24 h to obtain the lithium-rich transition metal oxide Li 2 NiO 2 .

[0070] The lithium-rich transition metal oxide Li 2 NiO 2 Disperse in absolute ethanol, add silicon-containing material hexadecyltrimethoxysilane, stir magnetically to make it evenly mixed, filter with suction and dry to obtain a positive electrode lithium supplement material. Among them, the mass ratio of lithium-rich transition metal oxides to silicon-containing materials is 94.2:5.8; the average particle size Dv50 of the positive electrode lithium supplement material is 14 μm, and the specific surface area is 0.5m 2 / g; based on the total mass of the positive electrode lithium supplement material, the mass percentage of silicon in the surface layer is 0.5%.

[...

Embodiment 2

[0083] Example 2, Example 3, Example 4, Example 5, Example 6, Example 7, Example 8, Example 9, Example 10, Example 11, Example 12, Example 13, Example 14. In Example 15, Example 16, Example 17 and Example 18, , , , , , and the preparation steps are all the same as in Example 1, and the changes of relevant preparation parameters are as shown in Table 1:

[0084] Table 1

[0085]

[0086]

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Abstract

The invention provides a positive electrode lithium supplementing material, a positive electrode plate containing the positive electrode lithium supplementing material and an electrochemical device. The positive electrode lithium supplementing material comprises an inner core of lithium-rich transition metal oxide Li2MO2 and a surface layer existing on the inner core, wherein the surface layer comprises a silicon-containing material Q-(CQ'2) n-Si(OR)3; wherein M comprises at least one of Mn, Fe, Co, Ni or Cu; q comprises at least one of vinyl, methyl, methoxyl, trifluoromethyl, amino, epoxy group, methacryloyloxy, sulfydryl or ureido, Q'comprises at least one of hydrogen element or fluorine element, n is an integer selected from 0 to 20, and R comprises one of methyl or ethyl. When the positive electrode lithium supplementing material is applied to a positive electrode plate, active lithium can be effectively supplemented, and the energy density of the electrochemical device is improved. Moreover, the content of free lithium on the surface of the positive electrode lithium supplementing material is low, slurry gel can be effectively inhibited, the processing performance can be improved, and the high-temperature storage performance of the electrochemical device can be effectively improved.

Description

technical field [0001] The present application relates to the field of electrochemistry, in particular to a positive electrode lithium supplement material, a positive electrode sheet containing the material, and an electrochemical device. Background technique [0002] Lithium-ion secondary batteries have the advantages of high energy storage density, high open circuit voltage, low self-discharge rate, long cycle life, and good safety. They are widely used in various fields such as electric energy storage, mobile electronic equipment, electric vehicles, and aerospace equipment. With the rapid development of mobile electronic devices and electric vehicles, the market has put forward higher and higher requirements for the energy density, cycle performance and dynamic performance of lithium-ion secondary batteries. [0003] During the first charge and discharge process of lithium-ion secondary batteries, a large amount of solid electrolyte interphase film (Solid Electrolyte Inte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/60H01M4/13H01M10/0525H01M10/42
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M4/604H01M4/13H01M10/0525H01M10/4235Y02E60/10
Inventor 周墨林
Owner NINGDE AMPEREX TECH
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