A method for recycling waste lithium sub-batteries to prepare lithium-sulfur battery cathode materials

A technology for lithium sub-battery and positive electrode material is applied in the field of recycling waste lithium sub-battery to prepare lithium-sulfur battery positive electrode material. Broad application prospects and easy-to-scale effects

Active Publication Date: 2019-04-05
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims to solve the problems of difficult recycling of waste lithium thionyl chloride batteries and the problems of complex process, complicated steps, high cost, difficult control and batch preparation in the preparation method of lithium-sulfur battery cathode materials. Method for preparing lithium-sulfur battery cathode material from acid chloride battery

Method used

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  • A method for recycling waste lithium sub-batteries to prepare lithium-sulfur battery cathode materials
  • A method for recycling waste lithium sub-batteries to prepare lithium-sulfur battery cathode materials
  • A method for recycling waste lithium sub-batteries to prepare lithium-sulfur battery cathode materials

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Embodiment 1

[0028] A method for recycling waste lithium sub-batteries to prepare lithium-sulfur battery cathode materials, the operation steps are as follows:

[0029] (1) Disassemble the discarded lithium thionyl chloride battery (ER14250) after discharge, and collect 5 g of the sulfur / carbon black mixture of the positive electrode;

[0030] (2) the 5g sulfur / carbon black mixture that step (1) collects is cleaned with ethanol, collects filter residue after filtering;

[0031] (3) Add 5g of the filter residue collected in step (2), that is, the sulfur / carbon black mixture, into 100mL of mixed acid (the mixed acid is 1mol / L hydrochloric acid + 1mol / L nitric acid, the volume ratio of the two is 1:1) , heated and stirred at 50°C for 3 hours, filtered, washed the filter residue with deionized water until the eluate was neutral, dried and collected the sample, which was the positive electrode material of lithium-sulfur battery; the obtained sample was subjected to X-ray diffraction, scanning e...

Embodiment 2

[0033] A method for recycling waste lithium sub-batteries to prepare lithium-sulfur battery cathode materials, the operation steps are as follows:

[0034] (1) Disassemble the discarded lithium thionyl chloride battery after discharge, and collect the sulfur / carbon black mixture of the positive electrode;

[0035] (2) The 5g sulfur / carbon black mixture collected in step (1) is cleaned with a mixture of organic solvent ether, acetone and n-hexane (the mixture of the three in a volume ratio of 1:1:1), and the filter residue is dried after filtering;

[0036] (3) Add 5g of filter residue obtained after drying in step (2), sulfur / carbon black mixture into 10ml of nitric acid solution with a concentration of 8mol / L, heat and stir at 35°C for 24 hours, filter, and wash the filter residue with deionized water until washed out The solution is neutral, and the sample collected by drying is the positive electrode material of lithium-sulfur battery.

Embodiment 3

[0038] A method for recycling waste lithium sub-batteries to prepare lithium-sulfur battery cathode materials, the operation steps are as follows:

[0039] (1) Disassemble the discarded lithium thionyl chloride battery after discharge, and collect the sulfur / carbon black mixture of the positive electrode;

[0040] (2) the 5g sulfur / carbon black mixture that step (1) collects is cleaned with organic solvent ethyl acetate, and filter residue is dried after filtering;

[0041] (3) Gained 5g filter residue after drying in step (2), sulfur / carbon black mixture joins 1000ml concentration and is the hydrochloric acid solution of 0.5mol / L and the nitric acid solution mixture (the nitric acid solution of 0.5mol / L hydrochloric acid solution and 0.5mol / L Solution volume ratio 1:1 mixed), heated and stirred at 80°C for 1 hour, filtered, washed the filter residue with deionized water until the eluate was neutral, dried and collected the obtained sample, which was the positive electrode mat...

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Abstract

The invention discloses a method for preparing a lithium-sulfur battery anode material by recycling waste lithium thionyl chloride batteries. The method comprises the following steps: (1) removing discharged waste lithium thionyl chloride batteries, and collecting a sulfur / carbon black mixture of an anode; (2) washing with a volatile organic solvent, and collecting residues after filtering; and (3) adding into an acid solution, heating and stirring, filtering, washing with water to be in neutral, drying, and collecting the obtained sample. The method can be used for preparing a lithium-sulfur battery anode material by recycling the waste lithium thionyl chloride batteries, wherein elemental sulfur is very uniformly distributed in carbon black, sulfur in the product has very uniform dispersibility and has strong interaction force with carbon black, and carbon black is good in electrical conductivity and can well buffer and restrain sulfur volume expansion. The method disclosed by the invention is simple and feasible, economical and environment-friendly and easy to realize large-scale production, and has broad application prospects, economic benefit values and social environmental protection values.

Description

technical field [0001] The invention relates to a method for preparing a positive electrode material of a battery, in particular to a method for recycling waste lithium sub-batteries to prepare a positive electrode material for a lithium-sulfur battery. Background technique [0002] Lithium thionyl chloride batteries, referred to as lithium-thionyl chloride batteries, have become the main series of lithium battery products produced in the world today, and are widely used in aerospace, electronic communications, instrumentation and other fields. The annual consumption of lithium thionyl chloride batteries in China alone exceeds billion. The lithium thionyl chloride battery uses metal lithium as the negative electrode material, thionyl chloride as the positive electrode active material, and carbon black as the positive electrode carrier material and current collector. When the battery is discharged, elemental sulfur is generated and attached to the surface of the positive car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/54
CPCY02W30/84
Inventor 朱金良沈培康李健全钟伟乐陈挺黄士志
Owner GUANGXI UNIV
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