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A kind of binder and preparation method thereof and negative electrode and lithium ion battery containing the binder

A technology of lithium-ion batteries and adhesives, which is applied in the manufacture of battery electrodes, secondary batteries, and electrolyte batteries, etc., can solve unrelated problems, and achieve the effect of improving initial Coulombic efficiency, improving cycle stability and initial Coulombic efficiency

Active Publication Date: 2022-05-06
GUILIN ELECTRICAL EQUIP SCI RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In summary, the prior art does not involve the simultaneous modification of polyamic acid or polyimide containing aromatic heterocyclic lithium salts and polymer lithium salts, and the modification of small molecule organic aromatic heterocyclic rings from the main structure of the imide group. Compounds to achieve technology to improve the characteristics of lithium batteries

Method used

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  • A kind of binder and preparation method thereof and negative electrode and lithium ion battery containing the binder
  • A kind of binder and preparation method thereof and negative electrode and lithium ion battery containing the binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1. Preparation of Adhesive

[0051] 1) Preparation of polyamic acid solution:

[0052] In a nitrogen atmosphere, under the conditions of controlling the temperature of the synthesis system at 15°C, 10.85 g of the aromatic diamine m-phenylenediamine (m-PDA), 20.10g of aromatic diamine 3,4'-diaminodiphenyl ether (3,4'-ODA) was stirred and dissolved. After m-PDA and TPE-M were completely dissolved, the aromatic diamine was added in 10 times at a uniform speed. 59.05g of aromatic dianhydride 2,3,3',4'-biphenyltetracarboxylic dianhydride (α-BPDA) with a molar ratio of 1:1, stirred at 1500r / min, synthesized by polycondensation for 24h to obtain the total amount (M) is the polyamic acid solution of 500g, and its solid content ratio is 18wt%;

[0053] 2) Preparation of dispersion:

[0054]Add 2.84g (3.0wt%) lithium orotate and 1.89g (2.0wt%) lithium polymethacrylate into the preparation kettle, add 30.0g deionized water for stirring and pre-dissolving / swelling, while maintai...

Embodiment 2

[0069] With embodiment 1, its difference is only: step 2) and 3) when preparing adhesive are carried out as follows:

[0070] 2) Preparation of the dispersion: add 0.27g (0.3wt%) lithium 2-picolinate and 0.18g (0.2wt%) lithium polyethacrylate into the preparation kettle, add 30.0g deionized water for stirring and pre-dissolving / swelling , while maintaining the temperature of the solution system in the configuration kettle at 50°C, ultrasonication for 1h, then adding 30.0g of N,N'-dimethylacetamide (DMAC) solvent and continuing to stir for 24h to obtain a dispersion;

[0071] 3) Add all the dispersion liquid prepared in step 2) to the polyamic acid solution prepared in step 1), and continue to stir for 24 hours at 18°C, and the obtained resin mixture is the binder for lithium ion battery negative electrode (solid The total amount of ingredients is 90.45g, including 99.5wt% of polyamic acid, 0.3wt% of lithium 2-picolinate, and 0.2wt% of lithium polyethacrylate).

[0072] The te...

Embodiment 3

[0074] 1. Preparation of Adhesive

[0075] 1) Preparation of polyamic acid solution:

[0076] In a nitrogen atmosphere, under the conditions of controlling the synthesis system temperature to 30°C, add 14.86g of aromatic diamine m-phenylenediamine (m-PDA), 66.24g Aromatic diamine 1,3-bis(4-aminophenoxy)benzene (TPE-R) was stirred and dissolved. After 3,4'-ODA and TPE-R were completely dissolved, it was added in 8 times at a uniform speed with the aromatic 74.90g of aromatic diacid anhydride pyromellitic diacid (PMDA) with a diamine molar ratio of 1:1, and stirred at 1200r / min, synthesized by polycondensation reaction for 48h to obtain a polyamic acid solution with a total amount (M) of 1000g , its solid content ratio is 15wt%;

[0077] 2) Preparation of dispersion:

[0078] Add 3.26g (2.1wt%) 2,4-dimethoxy-5-pyrimidine carboxylate lithium and 2.18g (1.4wt%) poly(3-thiophene acetate) lithium in the preparation kettle, add 15.0g deionized water Perform stirring pre-dissoluti...

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Abstract

The invention discloses a binder, a preparation method thereof, a negative electrode containing the binder and a lithium ion battery. The adhesive contains polyamic acid and / or polyimide accounting for 99.5-95.0wt% of the total weight of solid components in the adhesive system, accounting for 0.3-3.0wt% of the total weight of solid components in the adhesive system % of small molecular organic aromatic heterocyclic lithium salts and high polymer lithium salts accounting for 0.2 to 2.0 wt% of the total weight of the solids in the binder system; the small molecular organic aromatic heterocyclic lithium salts do not contain benzene Cyclic pyrimidine or pyridine or thiophene structural lithium salt, or a combination of two or more of them; the high polymer lithium salt is aliphatic high polymer lithium salt and / or heterocyclic high polymer lithium salt. The present invention simultaneously modifies polyamic acid and / or polyimide through small molecule organic aromatic heterocyclic lithium salt and high polymer lithium salt, so that the obtained battery can obtain excellent first charge and discharge efficiency and cycle stability.

Description

technical field [0001] The invention relates to a lithium ion battery, in particular to a binder and a preparation method thereof, a negative electrode containing the binder and a lithium ion battery. Background technique [0002] Lithium ion battery is a secondary battery that can move lithium ions between the positive electrode and the negative electrode to charge and discharge. It is mainly composed of positive electrode, negative electrode and electrolyte (electrolyte). Because of its high energy density and high capacity, it can be widely used Drive power applied to mobile information terminals. In recent years, it has also been widely used in industrial applications such as electric / hybrid vehicles that require large capacity, and further research is required to increase its capacity and performance. One of its research directions is to use silicon or tin, or alloy anode materials containing these components, to increase its charge and discharge capacity. [0003] At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/13H01M10/0525H01M10/058
CPCH01M4/622H01M4/13H01M10/058H01M10/0525Y02E60/10Y02P70/50
Inventor 任小龙朱凌云刘鑫雨汪英
Owner GUILIN ELECTRICAL EQUIP SCI RES INST