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Composite lithium battery and preparation method thereof

A lithium-composite battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle performance, easy loss of active materials, and low safety

Inactive Publication Date: 2017-02-15
SHANGHAI INST OF SPACE POWER SOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the defect that the active material in the existing lithium battery is easy to lose, provide a method to alleviate the disadvantages of low safety and poor cycle performance of the lithium-sulfur battery, and improve the comprehensive performance of the battery in terms of specific energy density, safety, and cycle life. performance

Method used

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  • Composite lithium battery and preparation method thereof
  • Composite lithium battery and preparation method thereof
  • Composite lithium battery and preparation method thereof

Examples

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Embodiment 1

[0033] Step 1. Accurately weigh elemental sulfur and LFPO (lithium iron phosphate) cathode materials according to the stoichiometric ratio, wherein sulfur accounts for 30%. In step 2, the weighed material is put into grinding for half an hour to obtain a mixed material sample, which is used as the positive electrode active material material of the new composite lithium battery. In step 3, the positive electrode active material is made into the positive electrode of the battery, and a composite lithium battery is formed with the negative electrode, separator and electrolyte.

[0034] Elemental sulfur ( figure 1 A in A), LFPO cathode material ( figure 1 B in B) and the mixed cathode material obtained by this example ( figure 1 The SEM (scanning electron microscope) image of C) is shown in figure 1 As shown, it can be seen from the figure that the morphology of the elemental sulfur material itself is basically not damaged, and the LFPO cathode material particles are attached t...

Embodiment 2

[0038] Step 1. Accurately weigh elemental sulfur and LFPO cathode material according to the stoichiometric ratio, wherein sulfur accounts for 20%. In step 2, the weighed material is put into grinding for half an hour to obtain a mixed material sample, which is used as the positive electrode active material material of the new composite lithium battery. In step 3, the positive electrode active material is made into the positive electrode of the battery, and a composite lithium battery is formed with the negative electrode, separator and electrolyte.

[0039] The charge-discharge curve of the novel composite lithium battery obtained by this embodiment is as follows: Figure 4 As shown, the charging and discharging platform of the elemental sulfur cathode material and the charging and discharging platform of the LFPO cathode material can be clearly distinguished from the figure. The charge specific capacity is 320.2mAh / g, the discharge specific capacity is 336.8mAh / g, and the eff...

Embodiment 3

[0041] Step 1. Accurately weigh lithium sulfide and LFPO cathode materials according to the stoichiometric ratio, wherein lithium sulfide accounts for 30%. In step 2, the weighed material is put into grinding for half an hour to obtain a mixed material sample, which is used as the positive electrode active material material of the new composite lithium battery. In step 3, the positive electrode active material is made into the positive electrode of the battery, and a composite lithium battery is formed with the negative electrode, separator and electrolyte.

[0042] The charge-discharge curve of the novel composite lithium battery obtained by this embodiment is as follows: Figure 5 As shown, the charge specific capacity is 471.9mAh / g, the discharge specific capacity is 439.4mAh / g, and the efficiency is 93.1%.

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Abstract

The invention discloses a composite lithium battery and a preparation method thereof. The composite lithium battery comprises an anode, a cathode, electrolyte and a diaphragm, wherein the anode comprises an anode active substance; the anode active substance is prepared from elemental sulfur and ferric phosphate or sulfide and lithium iron phosphate in a compounded manner; and the cathode is a lithium metal cathode or a composite cathode of metallic lithium and carbon. As the advantages of high specific volume of sulfur and high security and long service life of a lithium iron phosphate material are utilized, the defect that a conventional lithium iron phosphate ion battery is low in discharge energy density can be avoided, the defects that a lithium sulfur battery is low in security and poor in circulation property can be also avoided, and comprehensive properties of energy density, security and circulation service life of the battery can be improved.

Description

technical field [0001] The invention belongs to the field of lithium batteries, and relates to a composite lithium battery and a preparation method thereof. Background technique [0002] Energy is an important material basis for the development of the national economy and the improvement of people's living standards, and it is also an important factor that directly affects economic development. Due to the increasing shortage of non-renewable energy sources such as oil, natural gas, and coal, and the increasingly serious environmental pollution problems caused by the use of these energy sources, countries all over the world are stepping up to explore new energy sources or new sustainable energy utilization technologies, and batteries are one of them. one. At the same time, in order to facilitate the use of clean, safe, and renewable energy such as wind energy, solar energy, tidal energy, and geothermal energy, it needs to be converted into electrical energy, that is, high-ca...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/38H01M4/36H01M4/139
CPCH01M4/139H01M4/362H01M4/38H01M4/5815H01M4/5825Y02E60/10
Inventor 汤卫平朱蕾江小标吴勇民贾荻
Owner SHANGHAI INST OF SPACE POWER SOURCES
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