Positive electrode additive of lithium battery

An additive and lithium battery technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of general battery self-discharge performance, low battery life, poor cycle performance, etc., to improve self-discharge performance, increase cycle life, The effect of cycle life improvement

Active Publication Date: 2016-07-06
朱政
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current lithium-ion batteries do not fully meet the existing needs, especially the positive electrode materials in the prior art have poor thermal stability due to their atomic structure and other reasons, resulting in poor cycle performance at room temperature or high temperature, low battery life, and insufficient safety. And other issues
[0005] In view of the above situation, the patent CN103050706B proposes a maleimide additive for lithium batteries and a corresponding positive electrode formula for lithium batteries. The additive refers to bismaleimide modified with cyanamide and melami...

Method used

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  • Positive electrode additive of lithium battery
  • Positive electrode additive of lithium battery
  • Positive electrode additive of lithium battery

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Preparation of modified maleimide additive: 0.09mol melamine, 0.01mol cyanuric acid and 0.02mol cyanamide as initiator, 340mL NMP as solvent, 0.2molN,N'-4,4'-diphenyl Methane-bismaleimide is modified, and the above substances are reacted at 65 ° C for 24 hours to obtain a modified maleimide containing cyanamide with NMP as a solvent, which is used as a lithium battery electrode material composition formula additive.

[0022] 1820gLiCoO 2 , 120g of KS6, 60g of PVDF and 850g of NMP were mixed uniformly to obtain positive electrode slurry. Then add 11.4g of the above additives and mix evenly, then add zirconium beads and mix for 2.5h, pour out the mixture, filter the zirconium beads, and obtain positive electrode slurry.

[0023] Prepare the positive plate according to the standard lithium-ion battery positive plate preparation method, match the standard negative plate, install the standard battery core with a size of 5mm (height) * 59mm (length) * 37mm (width), and pour...

Embodiment 2

[0025] Preparation of modified maleimide additive: 0.01mol melamine, 0.09mol barbituric acid and 0.02mol cyanamide as initiator, 340mL DMF as solvent, 0.2mol reactant N,N'-4,4'- Diphenyl ether-bismaleimide is modified, and the above substances are reacted at 65 ° C for 24 hours to obtain a modified maleimide containing cyanamide with DMF as a solvent, which is used as a lithium battery electrode material composition Additives to recipes.

[0026] 1820gLiCoO 2 , 120g of KS6, 60g of PVDF and 850g of DMF were mixed uniformly to obtain positive electrode slurry. Then add 11.4g of the above additives and mix evenly, then add zirconium beads and mix for 2.5h, pour out the mixture, filter the zirconium beads, and obtain positive electrode slurry.

[0027] Prepare the positive plate according to the standard lithium-ion battery positive plate preparation method, match the standard negative plate, install the standard battery core with a size of 5mm (height) * 59mm (length) * 37mm (w...

Embodiment 3

[0029] Preparation of modified maleimide additive: 0.07mol triaminopyrimidine, 0.03mol cyanuric acid and 0.02mol cyanamide as initiator, 270mL NMP as solvent, 0.2mol reactant N,N'-4,4 '-Phenyl-bismaleimide was modified, and the above substances were reacted at 65°C for 24 hours to obtain a modified maleimide containing cyanamide with NMP as a solvent, which was used as a lithium battery electrode material composition Additives to food formulations.

[0030] 1820gLiMnO 2 , 120g of CGCF, 60g of PVDF and 850g of NMP were mixed uniformly to obtain positive electrode slurry. Then add 11.0 g of the above additives and mix evenly, then add mixed zirconium beads and mix for 2.5 hours, pour out the mixture, filter the zirconium beads, and obtain positive electrode slurry.

[0031] Prepare the positive plate according to the standard lithium-ion battery positive plate preparation method, match the standard negative plate, install the standard battery core with a size of 5mm (height) *...

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Abstract

The invention relates to a positive electrode additive of a lithium battery. The additive is modified maleimide modified by a combination containing amino-nitrile, annular alkali and annular acid; and after needle test on the battery prepared from the positive electrode additive, a result shows that the stability of the obtained positive electrode active material of the battery is greatly improved, and the cycle lifetime of the battery is prolonged. The positive electrode additive has the advantages that the used additive forms a protection film on the surface of the positive electrode active material, the positive electrode active material can be prevented from splitting during internal short circuit, and the battery is safer; and meanwhile, the good safe protection film is formed on the surface of the positive electrode active material, the service lifetime of the lithium battery is greatly prolonged, the cycle lifetime of the battery is also prolonged, and the self-discharging performance of the lithium battery is also greatly improved.

Description

technical field [0001] The invention relates to the field of battery materials, in particular to a lithium battery cathode additive. Background technique [0002] Lithium-ion secondary battery is a concept proposed by Armand in the 1980s. He proposed that the positive and negative electrode materials of the battery use lithium ion materials that can be stored and exchanged, and energy exchange is performed by using the ions to move back and forth during charging and discharging. [0003] In 1991, LiCoO was produced by Japan's SONY company. 2 Lithium-ion batteries are commercial lithium-ion batteries with carbon black as the positive electrode material and carbon black as the negative electrode material. Since then, lithium-ion batteries have rapidly replaced nickel-cadmium and nickel-metal hydride batteries in many fields. Lithium-ion batteries have very broad application prospects in electric vehicles and power storage. Therefore, solid-state polymer lithium-ion batteries...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCH01M10/0567Y02E60/10
Inventor 朱政
Owner 朱政
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