Positive plate and application thereof

A technology of positive electrode and positive electrode activity, applied in positive electrode and its application field, can solve the problems of positive electrode side reaction, battery cycle performance deterioration, etc., achieve stability, excellent electrochemical stability, and take into account the effect of service life

Pending Publication Date: 2021-12-31
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, under high voltage conditions, especially at operating voltages above 4.45V, side reactions will continue to occur on the surface of the positive electrode sheet, resulting in continuous deterioration of battery cycle performance

Method used

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  • Positive plate and application thereof
  • Positive plate and application thereof
  • Positive plate and application thereof

Examples

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preparation example Construction

[0072] The preparation method of the polymer of the present invention has no other particularity with the preparation method of the polymer in the art, for example, the solvent system comprising the monomer and the initiator is heated to a certain temperature under the protection of an inert gas to initiate the polymerization reaction, and can be Real-time monitoring of the degree of polymerization of the reaction system to judge the progress of the reaction, which is beneficial to obtain a polymer that meets the target molecular weight.

[0073] Specifically, the amount of the initiator added is 0.01-0.5% of the total mass of the polymer monomers. The initiator can be an initiator commonly used in this field, including but not limited to azobisisobutyronitrile AIBN, azobisisoheptanonitrile ABVN, dimethyl azobisisobutyrate, benzoyl peroxide BPO, benzoyl peroxide At least one of tert-butyl formate TBPB, ethyl 4-(N,N-dimethylamino)benzoate, and methyl o-benzoylbenzoate.

[0074...

Embodiment 1-3

[0100] The preparation method of the lithium ion battery of the present embodiment comprises the following steps:

[0101] 1) Preparation of positive electrode sheet

[0102] The positive electrode sheet of this embodiment includes a positive electrode current collector and a positive electrode active layer disposed on both functional surfaces of the positive electrode current collector, wherein the polymer is distributed inside the positive electrode active layer.

[0103] The preparation method of positive plate comprises the following steps:

[0104] a. Mix and disperse positive electrode active material, polymer, binder (PVDF), conductive agent (conductive carbon black) in NMP to prepare positive electrode slurry;

[0105] b. Coating the positive electrode slurry on the two functional surfaces of the aluminum foil, drying at 100° C. for 24 hours, rolling, and cutting to obtain the positive electrode sheet.

[0106] 2) Preparation of negative electrode sheet

[0107] The...

Embodiment 4-6

[0115] The preparation method of the lithium ion battery of the present embodiment comprises the following steps:

[0116] 1) Preparation of positive electrode sheet

[0117] The positive electrode sheet of this embodiment includes a positive electrode current collector and a positive electrode active layer arranged on both functional surfaces of the positive electrode current collector, wherein the positive electrode active layer includes a first active layer and a second active layer (polymer layer), and the second active layer Keep away from current collectors.

[0118] The preparation method of the positive electrode sheet of the present embodiment comprises the following steps:

[0119] a. Mix and disperse the positive electrode active material, binder (PVDF), and conductive agent (conductive carbon black) in NMP to prepare the first active layer slurry;

[0120] b. Coating the first active layer slurry on the two functional surfaces of the aluminum foil and drying at 1...

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Abstract

The invention provides a positive plate and application thereof. The positive plate comprises a current collector and a positive active layer arranged on at least one functional surface of the current collector, the inside and / or the surface of the positive active layer has a polymer comprising a first structural unit, and the first structural unit is derived from an olefin compound containing a substituted or unsubstituted ureido group. The positive plate has excellent high-voltage stability.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a positive electrode sheet, in particular to a positive electrode sheet and an application thereof. Background technique [0002] In recent years, as a secondary battery, lithium-ion batteries have been widely used in mobile phones, notebook computers, and electric vehicles. However, with the rapid development of lithium-ion batteries, how to extend the battery life of lithium-ion batteries and improve the The energy density is the biggest challenge facing the current lithium-ion battery technology field. [0003] At present, in order to prolong the life time of lithium-ion batteries and increase the energy density of lithium-ion batteries, in addition to continuously optimizing the space utilization of lithium-ion batteries and improving the compaction density and gram capacity of battery positive and negative electrode materials, the lithium-ion The charging voltage of the b...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/13H01M10/0525
CPCH01M4/604H01M4/13H01M10/0525H01M2004/028Y02E60/10
Inventor 唐伟超李素丽赵伟李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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