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

A technology for positive pole piece and lithium supplementation, which is applied in the field of electrochemistry and can solve the problems of deteriorating high temperature storage performance, storage flatulence, and performance degradation of lithium ion secondary batteries.

Active Publication Date: 2022-03-11
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
Comparison scheme
Effect test

Embodiment 1

[0065]

[0066] 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 .

[0067] Will Li 2 NiO 2 Dispersed in absolute ethanol, based on 100wt% Li 2 NiO 2 , then add 3.1wt% malonic acid, stir it with magnetic force to make it evenly mixed, filter it with suction and dry it to get the positive electrode lithium supplement material Li 2 NiO 2 · Li 2 C 3 h 2 o 4 . Among them, 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, Li in the surface layer 2 C 3 h 2 o 4 The mass percentage content is 3%.

[0068]

[0069] The positive electrode active material lithium cobalt oxide (LiCoO 2 ), the positive electrode lithium supplement material Li...

Embodiment 2

[0080] 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 and Example 16, , , , , , The preparation steps of and are the same as in Example 1, and the changes of relevant preparation parameters are as shown in Table 1:

[0081] Table 1

[0082]

[0083] In Comparative Example 1, Comparative Example 2, Comparative Example 3, Comparative Example 4 and Comparative Example 5, , , , and are the same as in Example 1. In Comparative Example 4 and Comparative Example 5, is the same as in Example 1, and the changes of relevant preparation parameters are shown in the table As shown in 2:

[0084] Table 2

[0085]

[0086]

[0087] Note: " / " in Table 2 indicates that the corresponding preparation parameter does not exist.

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Abstract

The invention provides a positive electrode lithium supplementing material, a positive electrode plate containing the material and an electrochemical device, the positive electrode lithium supplementing material comprises an inner core of a lithium-rich transition metal oxide Li2MO2 and a surface layer existing on the inner core, the surface layer comprises organic acid lithium LiwCxHyOz, M comprises at least one of Mn, Fe, Co, Ni or Cu, the LiwCxHyOz comprises at least one-COOLi group, 1 < = w < = 3, 1 < = x < = 6, 0 < = y < = 8, and 0 < = y < = 8. 2 < = z < = 7. When the positive electrode lithium supplementing material is applied to a positive electrode plate, active lithium can be supplemented, and the energy density of an electrochemical device is effectively improved. Moreover, the content of free lithium on the surface of the positive electrode lithium supplementing material is low, the gel phenomenon in the size mixing process can be effectively inhibited, the processing performance is improved, and the high-temperature storage performance of an electrochemical device is 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): H01M4/485H01M10/0525H01M10/42
CPCH01M4/485H01M10/0525H01M10/4235H01M2004/028Y02E60/10
Inventor 周墨林
Owner NINGDE AMPEREX TECH
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