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A kind of lithium-sulfur soft pack battery and preparation method thereof

A soft-pack battery, lithium-sulfur technology, applied in the field of lithium-sulfur soft-pack battery and its preparation, can solve the problems of irreversible loss of effective material, battery life decay, dead lithium, etc., and achieve the effect of high charge-discharge cycle efficiency and increased capacity

Active Publication Date: 2020-08-04
安徽通能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two obvious problems in existing lithium-sulfur batteries at home and abroad: the polysulfide compound produced by the positive electrode dissolves into the electrolyte, diffuses to the negative electrode through the diaphragm, and directly reacts with the lithium metal of the negative electrode, resulting in the loss of effective materials in the battery. Irreversible loss, battery life decay
Lithium metal is used in the negative electrode. Although lithium has a high energy density, due to its active chemical properties, it is very easy to react with the electrolyte, and SEI is repeatedly formed and destroyed, resulting in dead lithium and dendrites in the negative electrode.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] Wherein, the positive electrode active material includes polyacrylonitrile, elemental sulfur, carbon and accelerator with a ratio of 100:(200-500):(10-50):(1-10), the positive electrode active material The preparation method specifically comprises the following steps:

[0035] Step 101, adding carbon and accelerant to distilled water at a temperature of 95°C, and magnetic stirring for 30 minutes;

[0036] Step 102, adding polyacrylonitrile to the aqueous solution in step 101, stirring for 2 hours, the polyacrylonitrile is completely dissolved;

[0037] The mixed solution in step 103 and step 102 is naturally cooled to room temperature, then elemental sulfur is added, and the spinning solution is obtained after stirring for 2 hours;

[0038] Step 104, under the condition that the spinning voltage is 20kV and the distance between the spinneret and the receiving plate is 15cm, the liquid flow rate is selected to be about 0.1Ml / h to obtain the S-PAN composite product;

[...

Embodiment 1

[0060] Step 1. Preparation of positive electrode active material: Step 101. Add 10 parts of carbon and 10 parts of accelerator into distilled water at a temperature of 95° C., and stir magnetically for 30 minutes;

[0061] Step 102, adding 100 parts of polyacrylonitrile to the aqueous solution in step 101, and stirring for 2 hours, the polyacrylonitrile is completely dissolved;

[0062] The mixed solution in step 103 and step 102 was naturally cooled to room temperature, then added 200 parts of elemental sulfur, and stirred for 2 hours to obtain a spinning solution;

[0063] Step 104, under the condition that the spinning voltage is 20kV and the distance between the spinneret and the receiving plate is 15cm, the liquid flow rate is selected to be about 0.1Ml / h to obtain the S-PAN composite product;

[0064] Step 105, heat-treating the above S-PAN composite product in a tube furnace with a nitrogen atmosphere, so as to obtain a positive electrode active material.

[0065] Wher...

Embodiment 2

[0078] The difference from Example 1 lies in: Step 1, preparation of positive electrode active material: Step 101, adding 50 parts of carbon and 1 part of accelerator in distilled water at a temperature of 95° C., and magnetic stirring for 30 minutes;

[0079] Step 102, adding 100 parts of polyacrylonitrile to the aqueous solution in step 101, and stirring for 2 hours, the polyacrylonitrile is completely dissolved;

[0080] The mixed solution in step 103 and step 102 was naturally cooled to room temperature, then added 500 parts of elemental sulfur, and stirred for 2 hours to obtain a spinning solution;

[0081] Step 104, under the condition that the spinning voltage is 20kV and the distance between the spinneret and the receiving plate is 15cm, the liquid flow rate is selected to be about 0.1Ml / h to obtain the S-PAN composite product;

[0082] Step 105, heat-treating the above S-PAN composite product in a tube furnace with a nitrogen atmosphere, so as to obtain a positive ele...

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Abstract

The invention discloses a novel lithium-sulfur soft pack battery and a preparation method thereof, belonging to the technical field of battery preparation. Including: a positive electrode sheet, a negative electrode sheet, a diaphragm and an electrolyte; the positive electrode sheet includes a positive electrode fluid and a positive electrode material coated on the positive electrode fluid, and the positive electrode material includes: 75-94% positive electrode activity according to the mass fraction ratio substance, 3‑15% conductive agent and 3‑10% water-based glue. The present invention uses a non-elution type S positive electrode material to suppress the generation and shuttling of polysulfide compounds through a spinning method and heat treatment in a nitrogen atmosphere. And equipped with a special electrolyte and surface treatment of metal lithium to reduce the reactivity, the invention successfully inhibits the polysulfide compound from dissolving into the electrolyte, and diffuses to the negative electrode through the diaphragm, and directly reacts with the negative metal lithium.

Description

technical field [0001] The invention belongs to the technical field of battery preparation, in particular to a lithium-sulfur soft pack battery and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries have a high theoretical energy density of 2600wh / kg, which is much higher than the energy density of existing lithium ions (200wh / kg). The positive electrode S element is abundant in nature and low in price, and the lithium-sulfur battery formed does not use cobalt and nickel precious metals. Lithium-sulfur batteries cost less than comparable batteries due to their high energy density and inexpensive materials. Lithium-sulfur batteries are considered to be the most promising alternatives to lithium-ion batteries. However, there are two obvious problems in existing lithium-sulfur batteries at home and abroad: the polysulfide compound produced by the positive electrode dissolves into the electrolyte, diffuses to the negative electrode through the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052H01M10/0585H01M10/0587
CPCH01M4/362H01M4/38H01M4/628H01M10/052H01M10/0585H01M10/0587Y02E60/10Y02P70/50
Inventor 周海燕姜华
Owner 安徽通能新能源科技有限公司