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A cross-linked lithium-ion battery positive electrode material binder generated in situ, its preparation method and lithium-ion secondary battery

A technology for lithium ion batteries and positive electrode materials, applied in the field of electrochemistry, can solve the problems of particle agglomeration inside the electrode, battery performance decline, pole piece falling off, etc., and achieve the effects of reducing capacity decay, easy operation, and time saving.

Active Publication Date: 2020-09-25
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional binder for LIB is polyvinylidene fluoride (PVDF), which can provide certain mechanical and thermal stability of the electrode, but because the PVDF molecular chain tends to shrink and move towards the electrode after many cycles at high current density. The dissolution of the surface will cause serious agglomeration of particles inside the electrode, and even cause the electrode sheet to fall off from the surface of the current collector and cause cracks, resulting in a decrease in battery performance

Method used

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  • A cross-linked lithium-ion battery positive electrode material binder generated in situ, its preparation method and lithium-ion secondary battery
  • A cross-linked lithium-ion battery positive electrode material binder generated in situ, its preparation method and lithium-ion secondary battery
  • A cross-linked lithium-ion battery positive electrode material binder generated in situ, its preparation method and lithium-ion secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Prepare the binder:

[0040] Take by weighing 0.0050g polyethylene maleic anhydride and 0.0050g polypropylene alginate, add in the 10mL beaker immediately after weighing, then add 2mL N-methylpyrrolidone (NMP) to dissolve it and place it on a magnetic stirrer Stirring is carried out at 25° C., and the reaction time is 12 hours. After the stirring is completed, a binder solution is obtained in situ, which is an NMP solution of a cross-linked polymer PM-PG containing carboxyl groups, ester groups and hydroxyl groups.

[0041] The reaction formula of polyethylene maleic anhydride and polypropylene alginate is as follows figure 1as shown, figure 1 Among them, PE-MAH represents polyethylene maleic anhydride, and PG-Alg represents polypropylene alginate. The process of utilizing the above-mentioned binder to prepare the slurry of lithium-ion battery cathode material is:

[0042] 0.1500g lithium iron phosphate (LiFePO 4 ), 0.0400g acetylene black was added in the above-men...

Embodiment 2

[0045] Similar to the process of preparing the adhesive in Example 1, 0.0150 g of polyethylene maleic anhydride and 0.0150 g of poly(trimethylene alginate) were weighed and reacted to prepare an NMP solution of the adhesive PM-PG. 0.2100g lithium iron phosphate (LiFePO 4 ), 0.0600g acetylene black is added in the above-mentioned binder solution, wherein, lithium ferrous phosphate: acetylene black: binder=70wt%: 20wt%: 10wt%, stir 24h, obtain the slurry of lithium-ion battery cathode material , and then coated on the aluminum foil of the current collector. After coating, it was dried in an ordinary oven at 60°C for 6 hours, and then dried in a vacuum oven at 60°C for 24 hours. After drying, it was cut into circular electrode pieces with a diameter of 15mm.

Embodiment 3

[0047] Example 3 The process of preparing the adhesive is the same as that of Example 1. Weigh 0.0045 g of polyethylene maleic anhydride and 0.0045 g of polypropylene alginate to react to prepare an NMP solution of the adhesive PM-PG. 0.2410g lithium iron phosphate (LiFePO 4 ), 0.0600g acetylene black is added in the above-mentioned binder solution, wherein, lithium ferrous phosphate: acetylene black: binder=77wt%: 20wt%: 3wt%, stir 24h, obtain the slurry of lithium-ion battery cathode material , and then coated on the aluminum foil of the current collector. After coating, it was dried in an ordinary oven at 60°C for 6 hours, and then dried in a vacuum oven at 60°C for 24 hours. After drying, it was cut into circular electrode pieces with a diameter of 15mm.

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Abstract

The invention provides an in-situ generated cross-linked type lithium ion battery anode material adhesive which is a cross-linking product PM-PG of polyethylene maleic anhydride and propylene glycol alginate. The invention furthermore provides a preparation method of the cross-linked type lithium ion battery anode material adhesive. The preparation method comprises the following steps: dissolvingpolyethylene maleic anhydride and propylene glycol alginate into a solvent, and carrying out stirring at the room temperature to carry out a reaction, so as to obtain an adhesive solution. The invention furthermore provides a lithium ion battery anode material which consists of an active component, a conductive material and the cross-linked type lithium ion battery anode material adhesive. The invention furthermore provides a lithium ion secondary battery which comprises the lithium ion battery anode material. The cross-linked type lithium ion battery anode material adhesive provided by the invention comprises multiple polar bonds such as hydroxyl and carboxyl, and has good adhesiveness; and the cross-linked type lithium ion battery anode material adhesive provided by the invention has a 3D cross-linking network, and is capable of well covering active materials and conductive materials, and thus an electrode structure can be stabilized.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a cross-linked lithium-ion battery anode material binder produced in situ, a preparation method thereof and a lithium-ion secondary battery. Background technique [0002] Lithium ion batteries (LIB) are widely used in portable electronic devices and electric vehicles because of their high specific capacity, cycle stability and good safety. Moreover, the electric vehicle market is huge and growing, which not only puts forward higher requirements for battery specific capacity, but also pays more attention to battery safety and fast charging performance. Therefore, the development of LIB with better performance has always been a hot research field in the battery field. Goodenough, the father of lithium batteries, developed olivine-structured lithium iron phosphate (LFP) as a cathode material for lithium-ion batteries, which has edge-sharing FeO 6 Octahedron and PO 4 The s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02H01M4/62H01M10/0525
CPCC08G81/02H01M4/622H01M10/0525H01M2004/028Y02E60/10
Inventor 曾丹黎张俊峰陈奇张斌刘光鹏孙玉宝
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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