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Positive pole plate of lithium-sulfur cell and manufacturing method thereof

A cathode electrode, lithium-sulfur battery technology, applied in battery electrodes, electrode manufacturing, active material electrodes, etc., can solve the problems of cathode active material elemental sulfur or polysulfide loss, poor adhesion, etc. The effect of stability and cycle stability, strong adhesion and good cycle performance

Inactive Publication Date: 2009-04-01
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the lithium-sulfur battery binders used in the past are polyethylene oxide (PEO), styrene-butadiene rubber or polyvinylidene fluoride (PVDF). The former two have poor adhesion and need to be added to the positive electrode. content (>10%) to ensure that the active material and the conductive agent do not peel off (Sang-Eun Cheon, Ki-Seok Ko, Ji-Hoon Cho et al, J.Electrochem.Soc., 2002, 149(11), A1437-A1441; Sang-Eun Cheon, Ki-Seok Ko, Ji-Hoon Cho et al, J.Electrochem.Soc., 2003, 150(6), A800-A805); the latter has better adhesion, but requires Use high boiling point solvents such as N-methylpyrrolidone for dispersion, and at the same time, it is necessary to dry the pole piece at a higher temperature (80°C under vacuum), which is easy to cause the loss of elemental sulfur or polysulfide of the positive active material to a certain extent

Method used

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  • Positive pole plate of lithium-sulfur cell and manufacturing method thereof
  • Positive pole plate of lithium-sulfur cell and manufacturing method thereof
  • Positive pole plate of lithium-sulfur cell and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] At room temperature, fully swell the gelatin in water, and then dissolve it in a water bath at 60° C. to prepare an aqueous gelatin solution with a concentration of 3% by mass, and set aside.

[0030] Preparation of the positive electrode sheet: mix 7 parts by mass of sublimed sulfur and 2 parts of acetylene black in proportion, grind them evenly, then add a binder solution containing 1 part of gelatin solid, grind to make the binder solution and the active material Fully and evenly mixed with acetylene black to make a positive electrode material slurry, coated on an aluminum foil current collector, and vacuum-dried for 10 hours to obtain a positive electrode active material, a conductive agent and a gelatin binder with mass percentages of 70%, 20%, and 10% % positive pole piece.

[0031] The pole piece prepared above is used as the positive pole, Li is the negative pole, the diaphragm is made of polypropylene film, and the electrolyte is 1mol / L LiClO 4Solution, the so...

Embodiment 2

[0033] At room temperature, fully swell the gelatin in water, and then dissolve it in a water bath at 60° C. to prepare a 2% gelatin aqueous solution for later use.

[0034] Preparation of the positive electrode sheet: mix 6 parts by mass of sublimed sulfur and 3 parts of acetylene black in proportion, grind them evenly, then add a binder solution containing 1 part of gelatin solid, grind to make the binder solution and the active substance Fully and evenly mixed with acetylene black to make a positive electrode material slurry, coated on an aluminum foil current collector, and vacuum-dried for 10 hours to obtain a positive electrode active material, a conductive agent and a gelatin binder with mass percentages of 60%, 30%, 10% % positive pole piece.

[0035] Because the gelatin binder used has good dispersibility for the conductive agent, the components of the pole piece are uniformly dispersed without obvious agglomeration, such as figure 1 shown. Thus, the discharge perfo...

Embodiment 3

[0038] At room temperature, fully swell the gelatin in water, and then dissolve it in a water bath at 60° C. to prepare a 4% gelatin aqueous solution for later use.

[0039] Preparation of positive electrode material: Mix 7 parts by mass of sublimed sulfur and 2 parts of acetylene black in proportion, grind them evenly, then add a binder solution containing 1 part of gelatin solid, and grind until a uniformly dispersed positive electrode material slurry is formed , and coated on the aluminum foil current collector, frozen at -40 ° C for 4 hours to form an ice crystal structure, and then vacuum-dried for 12 hours to obtain a positive active material, a conductive agent and a gelatin binder with a mass percentage of 70%, 20%, 10% positive pole pieces with microporous structure.

[0040] The pole piece prepared above is used as the positive pole, Li is the negative pole, the diaphragm is made of polypropylene film, and the electrolyte is 1mol / L LiClO 4 Solution, the solvent is D...

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Abstract

The invention relates to a pole piece of a positive electrode of a lithium-sulfur battery and a preparation method thereof. The pole piece takes gelatin as a binding agent to coat a positive electrode active material and a conductive additive on a current collector, thereby improving the adhesion and the dispersion of the electrode. Meanwhile, the pole piece of the positive electrode of the lithium-sulfur battery prepared by freeze-drying comprises a micro-porous structure, thereby reducing the infiltration resistance of electrolyte on the pole piece and improving the electrochemical reversibility and the cycle stability of the battery.

Description

Technical field: [0001] The invention relates to a lithium-sulfur battery positive electrode sheet using gelatin as a binder and a preparation method thereof. Background technique: [0002] The rapid development of smaller, lighter and higher-performance electronic communication equipment requires the development of high-performance and large-capacity batteries to adapt to it. Lithium-sulfur battery has a high theoretical energy density (2800Whkg), and at the same time, the source of sulfur is abundant and harmless to the environment, so it has become a research hotspot. [0003] The preparation process of the positive electrode of a general lithium-sulfur battery is: mix the positive electrode active material, conductive agent and binder in a solvent to make a slurry, then coat the slurry on the current collector, and remove the residual solvent by vacuum drying, that is Obtain the positive pole piece. Among them, the binder is the key factor affecting the performance of ...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/36H01M4/62H01M4/66H01M4/04
CPCY02E60/10
Inventor 黄雅钦孙婧王维坤余仲宝王安邦苑克国
Owner BEIJING UNIV OF CHEM TECH
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