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Boron-doped and phosphite-coated nickel-based positive electrode material for lithium ion all-solid-state battery and preparation method of boron-doped and phosphite-coated nickel-based positive electrode material

A technology of all-solid-state batteries and lithium-ion batteries, which is applied in phosphorous acid, battery electrodes, positive electrodes, etc., can solve the problems of low electronic conductance without too much attention, and achieve good lithium ion conductivity and good application Effect

Active Publication Date: 2020-12-04
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Phosphite compounds (LiLa 1-y m y (PO 3 ) 4 , 0≤y≤0.4, referred to as LLP) due to its own low electronic conductivity, it has not received much attention in the traditional lithium-ion batteries that use liquid organic electrolytes as components.

Method used

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  • Boron-doped and phosphite-coated nickel-based positive electrode material for lithium ion all-solid-state battery and preparation method of boron-doped and phosphite-coated nickel-based positive electrode material
  • Boron-doped and phosphite-coated nickel-based positive electrode material for lithium ion all-solid-state battery and preparation method of boron-doped and phosphite-coated nickel-based positive electrode material
  • Boron-doped and phosphite-coated nickel-based positive electrode material for lithium ion all-solid-state battery and preparation method of boron-doped and phosphite-coated nickel-based positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh 0.0024mol of ammonium hydrogen phosphate, 0.0006mol of lanthanum hydroxide, 0.0324mol of lithium hydroxide and 0.0003mol of boric acid, respectively, and add them to a 250mL ball mill jar containing 20mL of ethylene glycol, in a ratio of 4:3:3 by mass. Add a total of 200g of zirconia grinding balls with particle sizes of 8mm, 12mm and 15mm, place the ball mill on a ball mill and grind for 3h at a speed of 500rmp, and then add 0.03mol of Ni 0.7 Co 0.15 Mn 0.15 (OH) 2 The precursor was continuously ball-milled at a speed of 100 rpm for 2 hours, and the uniformly stirred mixture was taken out and dried in a blast drying oven at 90° C. for 24 hours. The product obtained after drying was placed in a mortar and evenly ground, and then passed through a 400-mesh sieve. The powder was then calcined at 450 °C for 6 h in a tube furnace, heated to 800 °C for 15 h, and boron-doped &LiLa(PO) was obtained. 3 ) 4 (LLP) coated LiNi 0.7 Co 0.15 Mn 0.15 O 2 positive electrod...

Embodiment 2

[0045] Weigh 0.003mol of ammonium dihydrogen phosphate, 0.0004mol of lanthanum oxide, 0.324mol of lithium hydroxide and 0.003mol of boron oxide, respectively, and add them into a 500mL ball mill jar containing 200mL of propanol, according to the mass ratio of 4:3:3. A total of 200 g of zirconia grinding balls with particle sizes of 8 mm, 12 mm and 15 mm were added in proportion, and the ball mill was placed on the ball mill for 3 hours at a speed of 500 rpm, and then 0.3 mol of Ni was added. 0.8 Co 0.1 Mn 0.1 (OH) 2 The precursor was continuously ball-milled at a speed of 100 rpm for 2 hours, and the uniformly stirred mixture was taken out and dried in a blast drying oven at 90° C. for 24 hours. The product obtained after drying was placed in a mortar and evenly ground, and then passed through a 400-mesh sieve. The powder was then calcined at 450 °C for 6 hours in a tube furnace, and then heated to 750 °C and calcined for 15 hours to obtain boron-doped & LLP coating. LiNi ...

Embodiment 3

[0047] Weigh 0.012mol of phosphoric acid, 0.0015mol of lanthanum oxide, 0.165mol of lithium hydroxide and 0.0015mol of boron oxide, respectively, and add them to a 1000mL ball mill jar containing 200mL of propanol. A total of 1000 g of zirconia grinding balls with diameters of 6 mm, 10 mm and 13 mm were placed on the ball mill for 30 h at a speed of 300 rpm, and then 0.15 mol of Ni was added. 0.825 Co 0.115 Al 0.06 O 2 (OH) 2 The precursor was continuously ball-milled at a speed of 300 rpm for 3 hours, and the uniformly stirred mixture was taken out and dried in a blast drying oven at 100° C. for 24 hours. The product obtained after drying was placed in a mortar and evenly ground, then passed through a 500-mesh sieve, and then the powder was calcined at 450 °C for 6 h in a tube furnace, heated to 740 °C and calcined for 12 h to obtain boron-doped & LLP coating. LiNi 0.825 Co 0.115 Al 0.06 O 2 positive electrode material.

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Abstract

The invention discloses a boron-doped and phosphite-coated nickel-based positive electrode material for a lithium ion all-solid-state battery and a preparation method of the boron-doped and phosphite-coated nickel-based positive electrode material. By utilizing the characteristics of low melting point and high boiling point of a boron compound, the uniform distribution of coating elements on the surface of a high-nickel positive electrode material is promoted to form a continuous and complete coating layer, namely a lithium ion conductor phosphite layer (LLP), and meanwhile, boron is diffusedat high temperature to enter the bulk phase of the material to be doped to play a role in stabilizing the structure of the material. According to the boron-doped and phosphite-coated nickel-based positive electrode material, the phosphite coating layer formed on the surface of the positive electrode material can effectively improve the interface compatibility between the high-nickel positive electrode material and the sulfur compound solid electrolyte, so that the rapid increase of the interface impedance between the high-nickel positive electrode material and the sulfur compound solid electrolyte due to the space charge layer effect is avoided; and the application of the high-nickel positive electrode in the lithium ion sulfur-based electrolyte all-solid-state battery is promoted.

Description

Technical field: [0001] The invention relates to the technical field of all-solid-state lithium-ion battery materials and preparation thereof, in particular to a boron-doped & phosphite-coated co-modified high-nickel positive electrode material for sulfur-based solid-state electrolyte lithium-ion batteries, and preparation and application thereof. Background technique: [0002] Lithium-ion batteries are widely used as energy storage devices in the field of mobile electronic products, and are gradually extended to the field of transportation such as electric vehicles; however, due to the rapid increase in the market demand for electric vehicles, the energy density, cycle Life and safety also put forward higher requirements, in which positive and negative materials, electrolytes, etc. have become research hotspots. Traditional lithium-ion batteries use liquid organic ion conductive solvents as electrolytes, which have extremely poor stability at high temperatures and are also ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525C01B25/163C01G53/00
CPCC01B25/163C01G53/42C01G53/50C01P2002/72C01P2004/04C01P2004/61H01M4/366H01M4/505H01M4/525H01M4/62H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 李灵均陈嘉鑫宋刘斌
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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