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Preparation method for electrode material of secondary lithium battery with high specific energy

A technology for secondary lithium batteries and electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of lithium ion batteries, such as difficulty in increasing the specific energy, high battery specific energy, and slow lithium ion diffusion. Achieve the effect of low production cost, high conductivity and good cycle performance

Active Publication Date: 2016-12-21
安徽巡鹰新能源集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem mainly solved by the present invention: side reactions will occur when the secondary lithium electrode materials commonly used at present are discharged, and the side reactions will reduce the electronic conductivity of the battery, and the diffusion of lithium ions at room temperature is also relatively slow. It is difficult to further improve the problem, and a preparation method of a high specific energy secondary lithium battery electrode material is provided. The present invention first puts the mixed powder of oat and sesame into a tube furnace to calcinate the solid powder 1, and then Drying and crushing the white part of pomelo peel to obtain powder solid 2, mixing powder solid 1 and powder solid 2, adding potassium hydroxide solid, and then calcining to obtain a calcined product, soaking the calcined product in hydrochloric acid solution to modify The surface of the permanent calcined object, the surface modified material is put into a carbon disulfide solution dissolved in elemental sulfur, sealed and soaked, and after soaking, it is suction filtered and dried to obtain the electrode material. The electrode material prepared by the present invention can be prepared. Energy lithium-sulfur battery, high conductivity, high battery specific energy, low price, slow capacity decay in discharge cycle, good cycle performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] First, weigh 50g of oats and 10g of sesame seeds respectively, dry them completely and crush them, pass through an 80-mesh sieve to obtain oat powder and sesame powder, and mix and stir to obtain a mixed powder. Put the mixed powder into a crucible and place it in a tube furnace in a nitrogen atmosphere. Under protection, heat up to 800°C, calcine for 2 hours, cool to room temperature after treatment, and obtain solid powder 1 for later use; weigh 100g of pomelo peel, peel off the outer skin and leave the white part, cut the white part into pieces and put it in the oven , dried at 90°C for 8 hours, then pulverized, passed through a 100-mesh sieve to obtain powder, put the powder into a crucible, and placed in a tube furnace, heated to 850°C under the protection of nitrogen atmosphere, calcined for 2 hours, and then cooled to room temperature Obtain powder solid 2; mix the reserved powder solid 1 and the above powder solid 2 at a mass ratio of 1:1.5, mix with a high-speed...

example 2

[0023]First, weigh 55g of oats and 13g of sesame seeds respectively, dry them completely and crush them, pass through a 90-mesh sieve to obtain oat powder and sesame powder, and mix and stir to obtain a mixed powder. Put the mixed powder into a crucible and place it in a tube furnace in a nitrogen atmosphere. Under protection, heat up to 825°C, calcine for 3 hours, and cool to room temperature after treatment to obtain solid powder 1, which is set aside; weigh 110g of pomelo peel, peel off the skin and leave the white part, cut the white part into pieces and put it in the oven , dried at 95°C for 9 hours, then pulverized, passed through a 110-mesh sieve to obtain powder, put the powder into a crucible, and placed in a tube furnace, heated to 900°C under the protection of nitrogen atmosphere, calcined for 3 hours, and then cooled to room temperature Obtain powder solid 2; mix the spare powder solid 1 and the above powder solid 2 at a mass ratio of 1:1.5, mix with a high-speed di...

example 3

[0026] First, weigh 60g of oats and 15g of sesame seeds respectively, dry them completely and crush them, then sieve oat powder and sesame powder with 100 meshes, and mix and stir to obtain a mixed powder. Put the mixed powder into a crucible and place it in a tube furnace under the protection of a nitrogen atmosphere. heat up to 850°C, calcined for 4 hours, and cooled to room temperature after treatment to obtain solid powder 1 for later use; weigh 120g of pomelo peel, peel off the outer skin and leave the white part, cut the white part into pieces and put it in an oven. After drying at 100°C for 10 hours, it was crushed, passed through a 120-mesh sieve to obtain powder, put the powder into a crucible, and placed in a tube furnace, heated to 950°C under the protection of nitrogen atmosphere, calcined for 4 hours, and then cooled to room temperature to obtain Powder solid 2; mix the standby powder solid 1 and the above powder solid 2 at a mass ratio of 1:1.5, mix with a high-sp...

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Abstract

The invention discloses a preparation method for an electrode material of a secondary lithium battery with high specific energy, belonging to the field of electrode materials. The preparation method comprises the following steps: putting mixed powder of oat and sesame into a tubular furnace for calcining so as to obtain solid powder 1; drying and crushing the white parts of shaddock peel and carrying out calcining so as to obtain a powdery solid 2; mixing the solid powder 1 with the powdery solid 2, adding potassium hydroxide solid into the obtained mixture and carrying out calcining so as to obtain a calcinate; soaking the calcinate in a hydrochloric acid solution to modify the surface of the calcinate; sealing and soaking the surface modified substance in a carbon disulfide solution with dissolved elemental sulfur; and after soaking, carrying out pumping filtration and drying so as to obtain the electrode material. A lithium-sulfur battery with high specific energy can be prepared from the electrode material prepared in the invention, and the prepared lithium-sulfur battery has high conductivity, high specific energy, a low price, slow capacity fading in discharge cycles, and good cycle performance.

Description

technical field [0001] The invention discloses a preparation method of a high specific energy secondary lithium battery electrode material, belonging to the field of electrode materials. Background technique [0002] Lithium batteries can be divided into lithium primary batteries (also known as lithium primary batteries) and lithium secondary batteries (also known as lithium rechargeable batteries) [0003] Battery). Lithium secondary batteries are chemical power systems that can be charged and discharged multiple times. According to the different negative electrode materials used in lithium secondary batteries, they can be subdivided into secondary lithium batteries and secondary lithium ion batteries. Among them, the lithium battery uses pure metal lithium as the negative electrode material, while the negative electrode of the lithium ion battery is made of a lithium intercalation compound (such as graphite) or can be combined with Li+ [0004] Reactive compounds (such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/139
CPCH01M4/139H01M4/36H01M4/362Y02E60/10
Inventor 佟明王统军
Owner 安徽巡鹰新能源集团有限公司
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