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Modified sulfur positive electrode nanometer paste of lithium sulfur battery, preparation method of modified sulfur positive electrode nanometer paste, and preparation method for modified sulfur positive electrode plate of lithium sulfur battery

A lithium-sulfur battery and nano-slurry technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve problems such as serious environmental pollution, health threats to workers, and high toxicity

Inactive Publication Date: 2016-03-16
QINGDAO NENGXUN NEW ENERGY TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyvinylidene fluoride is used as a binder. Due to its high toxicity and the need to use toxic solvents, the production has a lot of pollution to the environment and poses a threat to the health of workers.

Method used

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  • Modified sulfur positive electrode nanometer paste of lithium sulfur battery, preparation method of modified sulfur positive electrode nanometer paste, and preparation method for modified sulfur positive electrode plate of lithium sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A modified lithium-sulfur battery sulfur cathode nano-slurry, the components and contents are shown in Table 1.

[0023] The preparation method is as follows: according to the proportion of the formula, adding the squash gum into water to dissolve and disperse, adding elemental sulfur and carbon nanotubes, and stirring until uniformly mixed.

[0024] Further preparing it into a sulfur positive electrode sheet for a modified lithium-sulfur battery comprises the following steps:

[0025] 1) Wash the aluminum foil with deionized water and acetone in sequence, first vacuum drying at 60°C for 8 hours, then normal pressure drying at 80°C for 2 hours;

[0026] 2) Pour the above-mentioned slurry on the cleaned and dried aluminum foil, use a scraper with a thickness of 200-400 μm to evenly coat the slurry on the rough surface of the aluminum foil, dry it, and cut it into discs with a diameter of 14mm to obtain Positive pole piece.

[0027] See Table 1 for the performance test ...

Embodiment 2

[0029] A modified lithium-sulfur battery sulfur cathode nano-slurry, the components and contents are shown in Table 1.

[0030] Its preparation method is with embodiment 1.

[0031] The method for making the electrode sheet is the same as in Example 1.

[0032] See Table 1 for the performance test results of the lithium-sulfur battery using the electrode sheets of this implementation.

Embodiment 3

[0034] A modified lithium-sulfur battery sulfur cathode nano-slurry, the components and contents are shown in Table 1.

[0035] Its preparation method is with embodiment 1.

[0036] The method for making the electrode sheet is the same as in Example 1.

[0037] See Table 1 for the performance test results of the lithium-sulfur battery using the electrode sheets of this implementation.

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Abstract

The invention discloses a modified sulfur positive electrode nanometer paste of a lithium sulfur battery. The modified sulfur positive electrode nanometer paste comprises the following constituents based on weight: 1 part of sesbania gum, 45-52 parts of water, 2.5-8 parts of elemental sulfur and 2-5 parts of carbon nanotube. In the modified sulfur positive electrode nanometer paste, the safe and green sesbania gum is taken as a binding agent for a positive electrode material of a lithium sulfur secondary battery, thus, the electrochemical performance of the electrode material is improved, moreover, no pollution is generated to an environment, and no harm is brought to a human body. Through tests, the cycle index reaches over 200 times when the lithium sulfur battery prepared from the positive electrode material is at high discharging specific capacitance (1,200mAh / g), and the capacity still can be maintained stability.

Description

technical field [0001] The invention relates to a lithium-sulfur battery cathode material, more specifically, a modified sulfur electrode material. Background technique [0002] Lithium-ion battery has the advantages of high energy density, small self-discharge, no memory effect, wide operating temperature range, long cycle life, etc. It is a secondary battery system with better comprehensive performance at present, and has been widely used in mobile phones, digital cameras and notebook computers and other portable electronic devices. However, with the continuous development of electronic electric equipment, especially the rise of electric vehicles and hybrid vehicles in recent years, traditional lithium-ion batteries have become increasingly difficult to meet people's demand for battery energy. Traditional lithium-ion battery cathode materials are mainly transition metal oxides (such as LiCoO 2 , LiMnO 2 and LiFePO 4 etc.), although it has the advantages of long cycle l...

Claims

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Application Information

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IPC IPC(8): H01M4/60H01M4/38H01M4/583H01M4/36C01B31/02H01M4/04H01M10/0525
CPCH01M4/04H01M4/362H01M4/38H01M4/583H01M4/602H01M10/0525Y02E60/10
Inventor 林展刘培杨李高然高学会刘杰汪倩倩
Owner QINGDAO NENGXUN NEW ENERGY TECH CO LTD
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