Secondary lithium cell using sulfurized crosslinking PVC as cathode material

A secondary lithium battery and polyvinyl chloride technology, which is applied in secondary batteries, electrode manufacturing, battery electrodes, etc., can solve the problems of complex synthesis process, environmental pollution, and great impact on the environment and equipment, and achieve low preparation cost, Good charge-discharge cycle performance and high energy density

Inactive Publication Date: 2005-01-12
TIANJIN UNIV
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Problems solved by technology

For example, Naoi synthesized dithiodianiline polymer cathode material for the first time in 1997 (J. Electrochem. Soc., 1997, 144 (6): L173) and obtained 270mAh g in lithium battery system -1 Discharge specific capacity, but due to the expensive raw materials and complex synthesis process of such materials, it is difficult to be practically applied; Skotheim applied polycarbon disulfide (PCS) electrodes to secondary lithium batteries and obtained better discharge capacity and cycle performance (US Patent, 5460905), but the pollution to the environment during the synthesis process can not b...

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  • Secondary lithium cell using sulfurized crosslinking PVC as cathode material
  • Secondary lithium cell using sulfurized crosslinking PVC as cathode material
  • Secondary lithium cell using sulfurized crosslinking PVC as cathode material

Examples

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Embodiment 1

[0021] Example 1 Preparation of a secondary lithium battery using tetrathio-crosslinked polyvinyl chloride as the cathode material:

[0022] 1. Cathodic Material Synthesis

[0023] Weigh 7.88g of anhydrous sodium sulfide (99%) and 9.70g of sublimed sulfur (99%) and mix them and place them in 70ml of N, N-dimethylformamide solvent, stir at room temperature for 1 hour and raise the reaction temperature to 62 ℃ and continue to stir for 12 hours, stop stirring and keep the temperature for later use.

[0024] Weigh 12.51g polyvinyl chloride (Mw=2×10 5 ) and dissolved in 300ml N, N-dimethylformamide solvent to obtain a transparent and clear solution, after which this solution was stirred at 80°C and the above-mentioned standby sodium polysulfide solution was added dropwise, the dropping process continued for 1 hour, and the dropping After the addition, the stirring was continued at 96° C. for 18 hours, a brownish-red precipitate appeared in the system, and the reaction was complet...

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Abstract

Cathode material is composed of 60-70%(Wt) sulfurization crosslinking PVC, 10-15% binder; 15-30% conduction agent. Preparation method includes following steps: obtaining solution of sodium polysulphide by dissolving mixed anhydrous sodium sulfide and sublimed sulfur in solvent of N,N-dimethylformamide; obtaining solution of PVC by dissolving PVC in solvent of N,N-dimethylformamide; obtaining sulfurization crosslinking PVC by dropping solution of sodium polysulphide to solution of PVC; powder product is obtained after dry. The disclosed cathode material grafts structure of multi sulfur linkage to framework of chain polymer to fix up S-S structure. Features are: no pollution in synthesizing process, high energy density and favorable charging and discharging cycle.

Description

technical field [0001] The invention relates to a secondary lithium battery using vulcanized cross-linked polyvinyl chloride as a cathode material and a preparation method thereof, belonging to the secondary lithium battery technology. Background technique [0002] In recent years, lithium-ion batteries have gradually become an important part of the field of chemical power sources, and their application potential in the environmentally friendly and clean power systems of electric vehicles has also attracted more and more researchers to join the research on lithium-ion batteries. In lithium-ion battery systems, polysulfide cathode materials have become one of the replacement candidates for existing cathode materials due to their low cost and high energy density, so the research on polysulfide electrode materials is very extensive. For example, Naoi synthesized dithiodianiline polymer cathode material for the first time in 1997 (J. Electrochem. ...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/60H01M4/62H01M10/40
CPCY02E60/122Y02E60/10
Inventor 唐致远徐国祥余碧涛杨冬平
Owner TIANJIN UNIV
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