Positive electrode protective material of lithium sulfur battery and application thereof

A technology for lithium-sulfur batteries and protective materials, applied in battery electrodes, lithium batteries, non-aqueous electrolyte batteries, etc., can solve problems such as weak force, high capacity of weakened materials, and difficulty in large-scale expansion, so as to suppress loss and increase energy Effects of conversion efficiency, rate performance, and good cycle performance

Inactive Publication Date: 2018-07-27
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of this type of method is very limited. The pure carbon surface is non-polar, and the force between it and the polar lithium polysulfide is weak, and the battery capacity decays quickly; or the preparation process is extremely complicated and on...

Method used

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  • Positive electrode protective material of lithium sulfur battery and application thereof
  • Positive electrode protective material of lithium sulfur battery and application thereof
  • Positive electrode protective material of lithium sulfur battery and application thereof

Examples

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preparation example Construction

[0094] The embodiment of the present invention also provides a method for preparing a positive electrode of a lithium-sulfur battery with a protective layer, comprising the following steps:

[0095] (1) Take the current collector, and prepare a positive electrode active material layer on the current collector;

[0096] (2) Under an inert atmosphere, the metal-organic framework is subjected to a heat treatment at 500-1200° C., so that the metal-organic framework is converted into a nanoporous carbon network embedded with metal nanoparticles, and then the metal nanoparticle embedded The nanoporous carbon network is subjected to oxidation, vulcanization, nitriding or phosphating treatment, so that the metal nanoparticles undergo a compound reaction to form metal compound nanoparticles or metal-metal compound composite nanoparticles, that is, the positive electrode protection material for lithium-sulfur batteries is obtained. The lithium-sulfur battery cathode protection material ...

Embodiment 1

[0129] A method for preparing a lithium-sulfur battery positive electrode material with a protective layer by a coating method, comprising the following steps:

[0130] (1) Weigh 1.44g of Co(NO 3 ) 2 ·6H 2 O and 3.24g of dimethylimidazole were dissolved in 100mL of ethanol to obtain Co(NO 3 ) 2 ·6H 2 O ethanol solution and dimethylimidazole ethanol solution; 5g lithium sulfide (Li 2 S) the powder is dispersed in the dimethylimidazole ethanol solution, and 5wt% polyvinylpyrrolidone (PVP) is added to obtain a mixed solution; the gained mixed solution is mixed with the above-mentioned Co(NO 3 ) 2 ·6H 2 The O ethanol solution was mixed and stirred for 10 minutes and then allowed to stand for 8 hours. The precipitate was filtered, washed with ethanol, and then dried in vacuum at 80°C for 12 hours to obtain a lithium sulfide composite material (Li 2 S@MOF).

[0131] (2) the above product Li 2 S@MOF was placed in a crucible in a tube furnace, and the sample was heated to 60...

Embodiment 2

[0136] A method for preparing a lithium-sulfur battery positive electrode material with a protective layer by a filling method, comprising the following steps:

[0137] (1) Weigh 0.74g of Zn(NO 3 ) 2 ·6H 2 O was dissolved in 50mL ethanol to obtain A solution, and 0.72g of Co(NO 3 ) 2 ·6H 2 O was dissolved in 50mL ethanol to obtain B solution, 3.24g of dimethylimidazole was dissolved in 100mL ethanol to obtain C solution, then A and C solutions were mixed, after stirring for 20 minutes, B solution was added to the mixed solution, and the stirring was continued for 20 minutes After 2 minutes of standing still for 2 hours, the obtained purple precipitate was filtered, washed and then dried in vacuum at 80°C for 12 hours to obtain a composite metal-organic framework ZnCo-mIM material; the obtained composite metal-organic framework material was placed in a crucible in a tube furnace In , the sample was heated to 910°C at a heating rate of 10°C / min under a nitrogen atmosphere, ...

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Abstract

In one embodiment, the invention provides a positive electrode protective material of a lithium sulfur battery. The material includes a nano-porous carbon network and inorganic nano-particles uniformly distributed therein. Distance of any two adjacent inorganic nano-particles is 3-50 nm. The inorganic nano-particles are metal compound nano-particles or metal-metal compound composite nano-particles. The nano-porous carbon network and the inorganic nano-particles can form an integrated three-dimensional nano-porous composite network. The positive electrode protective material has physical and chemical dual-adsorption effect and can constrain lithium polysulfide to nearby the positive electrode, thus effectively inhibiting loss of a positive active material in the lithium sulfur battery. Meanwhile, the material can accelerate conversion from soluble lithium polysulfide to indissolvable Li2S2 or Li2S, thus greatly improving energy conversion efficiency and rate capability of the lithium sulfur battery and achieving excellent cycle performance under high energy density. The invention also provides a practical application of the positive electrode protective material in the lithium sulfur battery.

Description

technical field [0001] The invention relates to the technical field of lithium-sulfur batteries, in particular to a lithium-sulfur battery cathode protection material and its application. Background technique [0002] In order to meet the needs of modern electronic products and achieve a substantial increase in battery energy density, some new high-capacity energy storage systems have gradually entered people's field of vision. Among them, the lithium-sulfur battery system based on the redox reaction has extremely high energy density, the theoretical specific capacity of the sulfur cathode is 1675mAh / g, and the energy density of the formed lithium secondary battery is as high as 2600Wh / kg, which is the current commercial lithium-ion battery capacity. 3-5 times that of sulfur, and the sulfur reserves are abundant, the price is low, and it is friendly to the environment, so it has great development prospects. [0003] However, in practical industrial applications, high-capaci...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M10/052B82Y30/00
CPCB82Y30/00H01M4/366H01M4/38H01M4/625H01M4/628H01M10/052H01M2004/021Y02E60/10
Inventor 夏威李阳兴夏圣安
Owner HUAWEI TECH CO LTD
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