Controllable preparation method of nano cathode material for lithium-sulfur primary battery

A cathode material and battery technology, which is applied in the field of controllable preparation of nano-anode materials for lithium-sulfur primary batteries, can solve the problems of short macroscopic size, large diameter of silver nanowires, and low specific capacity of batteries, and achieve high sulfur loading, Morphology controllable composition, structure stability effect

Active Publication Date: 2019-07-12
深圳市高能达电池有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It overcomes the disadvantages of large diameter and short macroscopic size of silver nanowires in the existing silver nanowire preparation technology; overcomes the technical problem of low battery specific capacity in the existing primary lithium battery technology

Method used

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  • Controllable preparation method of nano cathode material for lithium-sulfur primary battery
  • Controllable preparation method of nano cathode material for lithium-sulfur primary battery
  • Controllable preparation method of nano cathode material for lithium-sulfur primary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The first step is to prepare silver nanowires

[0038] Dissolve 0.1g of PVP in 6.2g of ethylene glycol to form a solution, and write it as solution A, and dissolve 1mg of NaCl in 3g of ethylene glycol to form a solution, and write it as solution B; dissolve 0.12g of silver nitrate in 6.2g of ethylene glycol The solution was prepared into solution, which was marked as solution C; put A in a round-bottomed flask, drip solution B into solution A under stirring conditions of 150℃ and 300rpm, and add 1 drop of silver nitrate solution, and then immediately lower the temperature to 100℃, and add the remaining solution C dropwise at a rate of 1 drop per second; continue the reaction for 6 hours until the solution becomes silver-gray and opaque to complete the reaction; the reaction solution after the reaction is completed and the acetone in a volume ratio of 1:4 Mix in proportion and centrifuge, then discard the supernatant; mix the product and the aqueous solution of N,N-dimethyl...

Embodiment 2

[0047] Others are the same as in Example 1, except that in the second step, the mass ratio of silver nanowires, absolute ethanol and nano-sulfur powder is 1:1:3.

[0048] image 3 When the silver nanowire / sulfur composite material prepared in this embodiment is used as the positive electrode of a lithium-sulfur battery, the first constant current discharge curve at a current density of 0.1C. At a discharge current density of 0.1C, the first constant current discharge specific capacity of the battery can still reach 890mAh / g, and the sulfur content is 60wt.%. Compared with Example 1, although the sulfur utilization efficiency has dropped by 28%, and the same The consumption of elemental lithium increased by 39%, but the consumption of silver nanowires decreased by 53.5%.

Embodiment 3

[0050] Others are the same as in Example 1, except that the first step is the addition of 0.5 g of PVP. The increase in the amount of PVP makes the diameter of the silver nanowires prepared in this embodiment smaller than that in Example 1, but the prepared silver nanowires are also shorter. The performance of the positive electrode material prepared in this example is close to that of example 1.

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Abstract

The invention relates to a controllable preparation method of a nano cathode material for a lithium-sulfur primary battery. The method comprises the steps of: the step 1, preparing silver nanowires; and the step 2, preparing a silver nanowire / sulfur composite material: putting the silver nanowires washed in the step 1, absolute ethyl alcohol and nano sulfur powder according to the mass ratio of 1:(1-3):(1-3) into a ball mill for ball milling for 2-4h at the 100-500 rpm, putting the mixture obtained through ball milling into a tubular furnace under the protection of a nitrogen atmosphere for heat treatment for 5-10h at a temperature in a range of 100-200 DEG C to prepare the silver nanowire / sulfur composite material. The problem is solved that a prepared lithium-sulfur primary battery cathode material is not high in conductivity and not high in sulfur-carrying capacity in the prior art, and the electrochemical performances of the lithium-sulfur primary battery are improved.

Description

Technical field [0001] The technical scheme of the present invention relates to a preparation process of an electrode material composed of active materials, in particular to a controllable preparation method of a nano-positive electrode material for lithium-sulfur primary batteries. Background technique [0002] Lithium-sulfur batteries are a new generation of lithium batteries with elemental sulfur as the positive active material and lithium elemental as the negative active material. It has an ultra-high theoretical specific capacity (1675mAh / g) and an ultra-high theoretical energy density (2600Wh / kg), which is more than 5 times the theoretical energy density (about 500Wh / kg) of lithium-ion batteries; and the positive active material sulfur It is one of the abundant elements in the earth's crust. It has the characteristics of low price and environmental friendliness, and can fully meet people's demand for new generation batteries. In fact, there is still a certain gap in the cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M6/16B82Y30/00B82Y40/00B22F9/16
CPCB22F9/16B22F2009/165B82Y30/00B82Y40/00H01M4/366H01M4/38H01M4/626H01M6/16
Inventor 张永光杜坚忠李朋生彭福生
Owner 深圳市高能达电池有限公司
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