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Oxide/fluorocarbon composite positive electrode material for primary lithium battery and preparation method thereof

A composite positive electrode material and composite material technology, which is applied in the field of carbon fluoride composite positive electrode materials and its preparation, can solve the problems of lower discharge specific capacity and energy density, lower discharge voltage, etc., and achieve good rate performance

Pending Publication Date: 2019-06-14
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the material has a high fluorine content, the discharge voltage is significantly reduced, resulting in a decrease in its discharge specific capacity and energy density. It is necessary to research and develop an effective method to increase the discharge voltage of fluorinated carbon materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Prepare 0.5 mol / L manganese carbonate ethanol aqueous solution (ethanol: water = 1:1). Weigh 1g of heteroatom-modified carbon fluoride, impregnate 500 μL manganese carbonate solution into the carbon fluoride by impregnation method, place the impregnated carbon fluoride at 90°C for aging in a closed system for 4 hours, and put the aged The composite material was dried at 60° C. for 12 hours, and the dried material was placed in a tube furnace, and heat-treated at 350° C. for 5 hours under a nitrogen atmosphere to prepare a heteroatom-doped carbon fluoride material coated with manganese oxide. The thickness of the manganese oxide cladding layer of the composite material is about 50nm. The fluorine content of the prepared material was 58 wt%. 0.1C 1.5V cut-off voltage discharge specific capacity is 870mAh g ～1 , the discharge voltage is 2.90V, and the discharge specific capacity of 1C 1.5V cut-off voltage is 700mAh g ～1 , the discharge voltage is 2.7V.

Embodiment 2

[0020] Prepare 0.5 mol / L manganese acetate aqueous ethanol solution (ethanol: water = 1:1). Weigh 2g of carbon fluoride nanotubes, impregnate 500 μL of manganese acetate solution into the carbon fluoride nanotubes by dipping method, place the impregnated carbon fluoride material at 90°C for aging in a closed system for 4 hours, and put the aged The composite material was dried at 60° C. for 12 hours, and the dried material was placed in a tube furnace, and heat-treated at 350° C. for 5 hours under a nitrogen atmosphere to prepare a manganese oxide-coated carbon fluoride nanotube material. The thickness of the manganese oxide cladding layer of the composite material is about 20nm. The fluorine content of the prepared material was 59% by weight. 0.1C 1.5V cut-off voltage discharge specific capacity is 851mAh g ～1 , the discharge voltage is 2.85V, and the discharge specific capacity of 1C 1.5V cut-off voltage is 680mAh g ～1 , The discharge voltage is 2.50V.

Embodiment 3

[0022] Prepare 0.5 mol / L manganese nitrate ethanol aqueous solution (ethanol: water = 1:1). Weigh 1.5g of fluorinated carbon fiber, impregnate 500μL manganese nitrate solution into the fluorinated carbon fiber by dipping method, place the impregnated fluorinated carbon material at 90°C for aging in a closed system for 4 hours, and dry the aged composite material After drying at 60° C. for 12 hours, the dried material was placed in a tube furnace, and heat-treated at 350° C. for 5 hours under a nitrogen atmosphere to prepare a manganese oxide-coated carbon fluoride fiber material. The thickness of the manganese oxide cladding layer of the composite material is about 20nm. The fluorine content of the prepared material was 59% by weight. 0.1C 1.5V cut-off voltage discharge specific capacity is 851mAh g ～1 , the discharge voltage is 2.85V, and the discharge specific capacity of 1C 1.5V cut-off voltage is 680mAh g ～1 , The discharge voltage is 2.50V.

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Abstract

The invention relates to a composite positive electrode material for preparing a metal lithium primary battery with high discharge voltage and high specific capacity. The oxide coating technology is adopted to maintain the high discharge specific capacity of the fluorocarbon material while increasing the discharge voltage of the fluorocarbon material. Then the metal oxide / fluorocarbon composite positive electrode material with high specific energy is obtained.

Description

technical field [0001] The invention belongs to the field of anode materials for novel metal lithium primary batteries and the application thereof, in particular to a metal oxide-coated carbon fluoride composite anode material and a preparation method thereof. Background technique [0002] The positive electrode materials of metal lithium primary batteries usually include manganese dioxide, thionyl chloride, sulfur dioxide, carbon fluoride, etc. Among many types of positive electrode materials, carbon fluoride materials have a low self-discharge rate, and the battery system is a solid system. It has obvious advantages such as stable voltage, high specific capacity, and good safety, and is widely used in metal lithium primary batteries. At present, the research on the application of fluorinated carbons is mainly focused on the modification of materials. Through technologies such as controlled fluorination, surface coating, and controlled thermal cracking, the carbon content c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/48H01M4/505H01M4/58
CPCY02E60/10
Inventor 陈剑郭德才
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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