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A cesium-doped vanadium potassium fluorophosphate/carbon positive electrode material and its preparation method and application

A technology of vanadium potassium fluorophosphate and cesium doping, which is applied in the field of cesium-doped vanadium potassium fluorophosphate/carbon cathode materials and its preparation, can solve the problems of poor electronic conductivity and ion conductivity, and achieve cycle performance enhancement and reduction Effect of transition barrier and uniform particle size

Active Publication Date: 2021-09-07
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention proposes a cesium-doped vanadium potassium fluorophosphate / carbon positive electrode material and its preparation method and application. The material is improved by in-situ carbon coating and cesium ion doping modification. The problem of poor intrinsic electronic conductivity and ionic conductivity of vanadium potassium fluorophosphate can effectively improve the potassium storage performance of the material

Method used

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  • A cesium-doped vanadium potassium fluorophosphate/carbon positive electrode material and its preparation method and application
  • A cesium-doped vanadium potassium fluorophosphate/carbon positive electrode material and its preparation method and application
  • A cesium-doped vanadium potassium fluorophosphate/carbon positive electrode material and its preparation method and application

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Embodiment 1

[0041] The anode material of the present embodiment cesium substituted vanadium potassium fluorophosphate type potassium battery, its expression is: K 0.98 Cs 0.02 VPO 4 F / C.

[0042]Weigh 0.1 mol of vanadium pentoxide, 0.2 mol of diammonium hydrogen phosphate, and 0.25 mol of acetylene black into the ball mill jar, and add 15ml of water, start the planetary ball mill, and ball mill at 600r / min for 12 hours to mix the mixture evenly , and the mixture was dried in an oven at 100°C for 12h and ground into tablets, the vanadium phosphate precursor was transferred to a tube furnace, heated to 750°C at a heating rate of 4°C / min under an argon atmosphere, and kept at a constant temperature for 4h After cooling naturally to room temperature, the vanadium phosphate / carbon composite material can be obtained. The obtained vanadium phosphate / carbon composite material and 0.004mol cesium fluoride, 0.196mol potassium chloride, and 0.196mol ammonium fluoride are transferred to a ball mil...

Embodiment 2

[0044] The anode material of the present embodiment cesium substituted vanadium potassium fluorophosphate type potassium battery, its expression is: K 0.95 Cs 0.05 VPO 4 F / C.

[0045] Weigh 0.1mol of vanadium pentoxide, 0.2mol of ammonium phosphate, and 0.22mol of Ketjen black into the ball mill jar, and add 15ml of ethanol, start the planetary ball mill, and at 400r / min, ball mill for 24h to mix the mixture evenly, The mixture was dried in an oven at 80°C for 20 hours and ground into tablets. The vanadium phosphate precursor was transferred to a tube furnace and heated to 700°C at a heating rate of 3°C / min under an argon atmosphere. After constant temperature for 6 hours Cool naturally to room temperature to obtain vanadium phosphate / carbon composite material. Transfer the obtained vanadium phosphate / carbon composite material and 0.01mol cesium chloride, 0.1mol potassium fluoride, and 0.09mol ammonium fluoride to a ball mill tank, start the planetary ball mill, and mix the...

Embodiment 3

[0047] The anode material of the present embodiment cesium substituted vanadium potassium fluorophosphate type potassium battery, its expression is: K 0.92 Cs 0.08 VPO 4 F / C.

[0048] Weigh 0.2 mol of ammonium metavanadate and 0.2 mol of ammonium dihydrogen phosphate, and add 0.23 mol of Ketjen black into the ball mill jar, and add 15 ml of ethanol, start the planetary ball mill, and mix the mixture by ball milling for 24 hours at 400r / min uniform, and the mixture was dried in an oven at 80°C for 12h and ground into tablets, the vanadium phosphate precursor was transferred to a tube furnace, and heated to 750°C at a heating rate of 2°C / min under an argon atmosphere. After 4 hours, it was naturally cooled to room temperature to obtain the vanadium phosphate / carbon composite material. Transfer the obtained vanadium phosphate / carbon composite material, 0.016mol cesium fluoride, and 0.184mol potassium fluoride to a ball mill jar, start the planetary ball mill, and mix the mixtu...

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Abstract

The present invention proposes a cesium-doped vanadium potassium fluorophosphate / carbon positive electrode material and its preparation method and application. The vanadium source, phosphorus source and carbon source are mixed uniformly by wet ball milling, dried and ground into tablets to obtain a vanadium phosphate precursor Under an inert atmosphere, heat to 650°C to 800°C to obtain vanadium phosphate; mix vanadium phosphate, cesium source, potassium source and fluorine source by ball milling, and dry to obtain a cesium-doped vanadium potassium fluorophosphate precursor; cesium-doped The vanadium potassium fluorophosphate precursor is heated to 550°C to 700°C under an inert atmosphere to obtain a cesium-doped vanadium potassium fluorophosphate / carbon positive electrode material; the carbon source is used as a reducing agent, and the V 5+ revert to V 3+ , the excess reducing agent reduces the pentavalent vanadium to 10%-30% of the required amount of trivalent vanadium, and the excess carbon source is used for in-situ carbon coating. The material is modified by in-situ carbon coating and cesium ion doping to improve the problem of poor intrinsic electronic conductivity and poor ion conductivity of vanadium potassium fluorophosphate, and effectively improve the potassium storage performance of the material.

Description

technical field [0001] The invention relates to the field of positive electrode materials for potassium ion batteries, in particular to a cesium-doped vanadium potassium fluorophosphate / carbon positive electrode material and a preparation method and application thereof. Background technique [0002] Since the commercial application of lithium-ion batteries in the 1990s, they have been widely used in electronic products, electric vehicles, and large-scale energy storage systems, which has exacerbated the shortage of lithium resources and pushed up the price of lithium-ion batteries. Therefore, it is imminent to develop a new energy storage battery with low cost and high performance. Because potassium is close to the low standard redox potential of lithium (-2.93V relative to the standard electrode potential), potassium ion batteries have a relatively high energy density; and the abundance of potassium in the earth's crust results in low The low cost and fast ion transport ki...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/054
CPCH01M4/362H01M4/5825H01M4/62H01M4/625H01M10/054Y02E60/10
Inventor 李龙赵敬丁书江吴虎秦媛媛
Owner XI AN JIAOTONG UNIV
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