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Preparation method of high-specific-capacity lithium battery cathode material

A technology of positive electrode material and high specific capacity, which is applied in the field of lithium battery positive electrode material preparation, can solve the problems that the research field of lithium battery performance has not been developed to the extreme, the charge and discharge capacity becomes low, and the cycle characteristics are not good, so as to improve cycle charge and discharge performance, improve performance, interweave rich effects

Active Publication Date: 2021-03-05
安徽嘉誉伟丰机电科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Publication No. CN110828784A discloses a lithium battery positive electrode material and its preparation method and application. The positive electrode material involved is a transitional metal oxide with a layered structure, which improves the first discharge specific capacity of the battery to a certain extent, but due to excessive Metal oxides will undergo structural changes during charge and discharge, resulting in continuous loss of power, lower effective charge and discharge capacity, poor cycle characteristics, and disadvantages such as high price and high pollution.
[0004] At present, research on the performance of lithium batteries is in full bloom, and the disadvantages of traditional transition metal oxides as positive electrode materials are gradually exposed.
However, in the research of lithium batteries, reports on positive electrode materials with high specific capacity are generally accompanied by large defects, which limits the application value.
At present, there is still no good way to solve this problem, making the research field of lithium battery performance not to the extreme.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The preparation of a sulfur-carbon composite cathode material comprises the following process steps:

[0024]Add 110 ml of deionized water and 0.15 g of polyvinyl alcohol into a four-neck flask equipped with a stirrer, condenser and thermometer, stir to dissolve, raise the temperature to 63 °C, and then add 5.6 ml of dimethylformamide and 23 g of propylene in sequence Nitrile monomer, 9.3 grams of elemental sulfur, feed nitrogen, carry out stirring reaction, add 0.31 grams of azobisisobutyronitrile at 180 rpm, keep the temperature at 58 ° C for 3.5 hours, filter after the reaction, and use Wash 4 times with deionized water, dry at 55°C for 6 hours, then place in a crucible and grind for 1.5 hours, add active material with a mass fraction of 0.23% to the fine powder obtained by grinding, continue mixing and grinding for 0.5 hours, place in a tube In the furnace, nitrogen protection was introduced, and the temperature was uniformly heated to 300° C. within 90 minutes, kep...

Embodiment 2

[0027] The preparation of a sulfur-carbon composite cathode material comprises the following process steps:

[0028] Add 115 ml of deionized water and 0.155 g of polyvinyl alcohol into a four-necked flask equipped with a stirrer, condenser and thermometer, stir to dissolve, raise the temperature to 64 °C, then add 5.65 ml of dimethylformamide and 23.5 g of propylene in sequence Nitrile monomer, 9.4 grams of elemental sulfur, feed nitrogen, carry out stirring reaction, add 0.32 grams of azobisisobutyronitrile at 190 rpm, keep the temperature at 59 ° C for 3.8 hours, filter after the reaction, and use Wash 4 times with ionized water, dry at 58°C for 7 hours, and then grind in a crucible for 1.8 hours, add active material with a mass fraction of 0.24% to the fine powder obtained by grinding, continue mixing and grinding for 0.8 hours, place in a tube In the furnace, nitrogen protection was introduced, and the temperature was uniformly heated to 305° C. within 95 minutes, kept for...

Embodiment 3

[0031] The preparation of a sulfur-carbon composite cathode material comprises the following process steps:

[0032] Add 120 ml of deionized water and 0.16 g of polyvinyl alcohol into a four-neck flask equipped with a stirrer, condenser and thermometer, stir to dissolve, raise the temperature to 65 ° C, and then add 5.7 ml of dimethylformamide and 24 g of propylene in sequence Nitrile monomer, 9.5 grams of elemental sulfur, feed nitrogen, carry out stirring reaction, add 0.33 grams of azobisisobutyronitrile at 200 rpm, keep warm at 60 ° C for 4.0 hours, filter after the reaction, and use Wash 5 times with deionized water, dry at 60°C for 8 hours, then place in a crucible and grind for 2.0 hours, add active material with a mass fraction of 0.25% to the fine powder obtained by grinding, continue mixing and grinding for 1.0 hour, place in a tube In the furnace, nitrogen protection was introduced, and the temperature was uniformly heated to 310° C. within 100 minutes, kept for 3.0...

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Abstract

The invention relates to the technical field of lithium battery cathode material preparation, discloses a preparation method of a high-specific-capacity lithium battery cathode material, and solves the problems that a sulfur-containing composite material cannot meet the requirement of rapid charging and discharging, a large amount of auxiliary conductive agent needs to be added, the sulfur-containing composite material is easily dissolved in electrolyte during discharging and the service life of a battery is influenced, the performance of the sulfur-containing composite material in the lithiumbattery is remarkably improved, the performance of the positive electrode material can be effectively improved, the performance of the prepared positive electrode material is comprehensively improved, and the circularity is enhanced. According to the invention, the conductivity of the sulfur-carbon composite positive electrode material is improved, the specific capacity is high, the effective value reaches 1240-1300mAh / g, the sulfur-carbon composite positive electrode material can also show excellent cycle performance at room temperature, the properties of quick charge and discharge, long discharge time, light weight and the like of a lithium battery are further improved, the requirements of modern electronic equipment industry are met, the use amount of a conductive agent is reduced, andcost is reduced.

Description

technical field [0001] The invention belongs to the technical field of preparation of lithium battery positive electrode materials, and in particular relates to a preparation method of high specific capacity lithium battery positive electrode materials. Background technique [0002] "Lithium battery" is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. In 1912, the lithium metal battery was first proposed and studied by Gilbert N. Lewis. In the 1970s, M. S. Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. With the development of science and technology, lithium batteries have become the mainstream. [0003] At present, transition metal oxides and sulfides are commonly used as cathode materials for lithium secondary batter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/62H01M10/052B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00H01M4/38H01M4/625H01M10/052H01M2004/028Y02E60/10
Inventor 叶建荣
Owner 安徽嘉誉伟丰机电科技股份有限公司
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