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Bismuth-tin-antimony-containing high-entropy oxide negative electrode energy storage material as well as preparation method and application thereof

A technology of energy storage materials and oxides, which is applied in the direction of negative electrodes, active material electrodes, battery electrodes, etc., can solve the problems of unstable cycle performance, poor electrical conductivity, and low capacity, and achieve inhibition of aggregation and crack propagation, electrical conductivity Good, high specific capacity effect

Pending Publication Date: 2022-05-24
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Technical problem to be solved: In order to overcome the deficiencies in the prior art, this application proposes a high-entropy oxide negative electrode energy storage material containing bismuth, tin and antimony and its preparation method and application, so as to solve the existing problems of lithium and sodium in the prior art. 1. Potassium ion battery negative electrode materials have technical problems such as low capacity, poor electrical conductivity, and unstable cycle performance. The present invention provides different methods to prepare high-entropy oxide materials containing bismuth, tin, and antimony, and the material can also be used in Negative electrode of lithium, sodium, potassium ion batteries

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  • Bismuth-tin-antimony-containing high-entropy oxide negative electrode energy storage material as well as preparation method and application thereof
  • Bismuth-tin-antimony-containing high-entropy oxide negative electrode energy storage material as well as preparation method and application thereof
  • Bismuth-tin-antimony-containing high-entropy oxide negative electrode energy storage material as well as preparation method and application thereof

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Effect test

Embodiment 1

[0049] The preparation method of the high-entropy oxide negative electrode energy storage material containing bismuth, tin and antimony, the steps are as follows:

[0050] The first step: Weigh equimolar amounts of cobalt carbonate, indium acetate, bismuth nitrate, stannous chloride, and antimony acetate according to the molecular formula and put them into the ball milling tank, and set the ball milling speed to 400r min. -1 , the high-entropy oxide precursor was obtained with a ball milling time of 8h;

[0051] The second step: take the high-entropy oxide precursor for annealing in a muffle furnace, and keep it at 500 °C for 10 hours in an air atmosphere;

[0052] The third step: grinding the material annealed in air to obtain bismuth tin antimony cobalt indium high-entropy oxide powder.

[0053] XRD characterization of bismuth tin antimony cobalt indium pentary high entropy oxide material figure 1 , the microscopic appearance is as figure 2 , it can be seen that the surf...

Embodiment 2

[0062] The preparation method of the high-entropy oxide negative electrode energy storage material containing bismuth, tin and antimony, the steps are as follows:

[0063] The first step: take 0.01mol chromium nitrate, 0.01mol antimony nitrate, 0.02mol bismuth nitrate, 0.02mol copper chloride, 0.02mol tin acetate, 0.02mol ferric nitrate and put them into the ball mill, set the ball milling speed to 500r min -1 , the ball milling time is 12h;

[0064] The second step: take the high-entropy oxide precursor for annealing in a muffle furnace, and keep it at 700 °C for 10 hours in an air atmosphere;

[0065] The third step: grinding the material annealed in air to obtain bismuth tin antimony iron copper chromium hexagonal high entropy oxide powder.

Embodiment 3

[0067] The preparation method of the high-entropy oxide negative electrode energy storage material containing bismuth, tin and antimony, the steps are as follows:

[0068] Step 1: Add 0.015mol cobalt acetate, 0.025mol indium acetate, 0.015mol bismuth nitrate, 0.025mol stannous chloride, and 0.02mol antimony acetate into a centrifuge tube, then add 30mL of ultrapure water, and freeze in liquid nitrogen 0.5h, then put it into the freeze dryer to dry for 48h;

[0069]The second step: take the high-entropy oxide precursor for annealing in a muffle furnace, and keep it at 600 °C for 10 hours in an air atmosphere;

[0070] The third step: grinding the material annealed in air to obtain bismuth tin antimony cobalt indium high-entropy oxide powder.

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Abstract

The invention discloses a high-entropy oxide negative electrode energy storage material containing bismuth, tin and antimony as well as a preparation method and application of the high-entropy oxide negative electrode energy storage material. The material is a multi-element high-entropy oxide material with five or more elements, wherein the multi-element high-entropy oxide material is composed of one or more of bismuth, tin and antimony and nickel, cobalt, manganese, copper, chromium, iron, indium, germanium, magnesium, aluminum, zinc, molybdenum, tungsten, vanadium or titanium. Preparing a uniform composite precursor from the element metal salts through one of physical ball milling, freeze drying, solvothermal, sol-gel or coprecipitation methods; and placing the obtained precursor in an annealing furnace, and annealing in the air at 300-700 DEG C for 0.5-48 hours to obtain the product. Due to the entropy stabilization effect and the phase stabilization effect, as the negative electrode material of the potassium, sodium and lithium ion battery, the internal stress generated by the volume change of metal oxide negative electrode particles in the charging and discharging process is relieved, the expansion of cracks in the particles is inhibited, the pulverization and component segregation of the negative electrode particles are avoided, the integrity of the electrode is kept, the structure is stable, and the cycle performance is good.

Description

technical field [0001] The invention belongs to the technical field of potassium, sodium and lithium ion batteries, and in particular relates to a high-entropy oxide negative electrode energy storage material containing bismuth, tin and antimony and a preparation method and application thereof. Background technique [0002] Limited by the reserves and price of lithium resources, it is difficult for the commercialized lithium-ion batteries (LIBs) to meet the requirements of large-scale energy storage. Compared with lithium, sodium and potassium are abundant in natural resources, inexpensive, and have a working mechanism similar to that of lithium-ion batteries. Therefore, sodium and potassium-ion batteries have the potential to become a substitute for lithium-ion batteries. At present, the research on lithium, sodium and potassium ion battery anode materials mainly focuses on carbon-based materials with low specific capacity, which have the characteristics of good conductivi...

Claims

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Application Information

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IPC IPC(8): H01M4/48H01M10/0525H01M10/054
CPCH01M4/483H01M10/0525H01M10/054H01M2004/027Y02E60/10
Inventor 黄镇东吴晶晶柏玲文锦泉
Owner NANJING UNIV OF POSTS & TELECOMM
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