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High-energy density type lithium cobaltate cathode material and preparation method thereof

A technology of high energy density and positive electrode material, applied in the field of high energy density lithium cobalt oxide positive electrode material and its preparation, to achieve the effects of stable structure, uniform distribution and improved lithium ion conductivity

Active Publication Date: 2018-02-27
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above problems, the purpose of the present invention is to provide a

Method used

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  • High-energy density type lithium cobaltate cathode material and preparation method thereof
  • High-energy density type lithium cobaltate cathode material and preparation method thereof

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preparation example Construction

[0021] The preparation method of the high energy density type lithium cobaltate cathode material provided by the invention comprises the following steps:

[0022] (1) Doping the Ni element into the cobalt source, then mixing it with the lithium source and the compound of the doping element M in proportion, and obtaining primary cobalt oxide particles after ball milling, sintering, crushing, and sieving; wherein the doped The heteroelement M is at least one of Mn, Mg, Al, Ti, and Zr.

[0023] In this step, the cobalt source is firstly prepared, and then the cobalt source is doped with nickel element. The doping process can be either dry or wet, and will not be described here. Then mix the cobalt source containing the doping element Ni with the lithium source and the compound of the doping element M according to a certain metering ratio, and obtain primary lithium cobaltate particles after ball milling, sintering, crushing, and sieving. Here, the primary lithium cobaltate parti...

Embodiment 1

[0035] Weighing and mixing tricobalt tetroxide pre-doped with Ni element, lithium carbonate and manganese dioxide according to a certain metering ratio. Wherein the Ni content is 0.5wt%, the Mn content is 0.5wt%, and the ratio of lithium to metal is 1.020. The weighed mixture was placed in a ball mill jar, and ball milled for 60 min at a speed of 300 rad / s. Then put it into a roller furnace, and sinter at 1080°C for 10 hours, and continuously feed air as an oxygen source during the sintering process. The sintered material is mechanically crushed and crushed, and then passed through a 325-mesh screen to obtain primary lithium cobaltate particles.

[0036] The primary lithium cobaltate particles, lithium carbonate, magnesium hydroxide, ammonium fluoride, ammonium dihydrogen phosphate, and vanadium pentoxide are weighed and mixed according to a certain metering ratio. Among them, Li:F:PO 4 3- : V=1:1:1:1, Mg content is 500ppm, LiVPO 4 F: LiCoO 2 The mass ratio is 1:99. Dis...

Embodiment 2

[0040] Weighing and mixing tricobalt tetroxide pre-doped with Ni element, lithium carbonate, manganese dioxide and magnesium hydroxide according to a certain metering ratio. Wherein the Ni content is 0.5wt%, the Mn content is 0.5wt%, the Mg content is 0.12wt%, and the ratio of lithium to metal is 1.020. The weighed mixture was placed in a ball mill jar, and ball milled for 60 min at a speed of 300 rad / s. Then put it into a roller furnace, and sinter at 1080°C for 10 hours, and continuously feed air as an oxygen source during the sintering process. The sintered material is mechanically crushed and crushed, and then passed through a 325-mesh screen to obtain primary lithium cobaltate particles.

[0041] The primary lithium cobaltate particles, lithium carbonate, magnesium hydroxide, ammonium fluoride, ammonium dihydrogen phosphate, and vanadium pentoxide are weighed and mixed according to a certain metering ratio. Among them, Li:F:PO 4 3- : V=1:1:1:1, Mg content is 500ppm, L...

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Abstract

The invention is applicable to the technical field of lithium batteries, and provides a high-energy density type lithium cobaltate cathode material and a preparation method thereof. According to the high-energy density type lithium cobaltate cathode material and the preparation method thereof, doped type primary lithium cobaltate particles are generated by performing solid phase reaction on a cobalt source which is pre-doped with Ni element, an additive and a lithium source, and then the surfaces of the doped type primary lithium cobaltate particles are coated with a doped N element-containingLiVPO4F material which is stable under high voltage, wherein the cobalt source is pre-doped with Ni, so that the Ni element can be distributed more uniformly in a substrate, and a material structureis more stable in a charging-discharging cyclic process; meanwhile, the substrate is added with an M element, so that the effect of stabilizing the material structure is further achieved. The LiVPO4Fmaterial has the advantages of stable structure, high voltage platform and the like; the lithium ion conductivity of the LiVPO4F material can be further improved through doping. The lithium cobaltatecathode material provided by the invention can be normally used under the max charge voltage of 4.50 V, and has excellent cycle performance and safety performance.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a high energy density lithium cobalt oxide cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have been widely used in small portable appliances such as notebook computers, mobile phones, and camcorders, and various 3C electronic products are becoming lighter and thinner, which puts forward higher requirements for the energy density of lithium-ion batteries. The development of cathode materials for lithium-ion batteries is a key factor for the further improvement of the overall performance of lithium-ion batteries. No matter in terms of electrochemical performance, including capacity, cycle performance or material price, cathode materials have become the bottleneck for further improvement of cost performance of lithium-ion batteries. part. [0003] Compared with ternary materials, lithium cobalt oxide mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/42H01M4/525H01M10/0525
CPCH01M4/525H01M4/58H01M10/0525H01M10/4235Y02E60/10
Inventor 徐世国靳亚珲栗志涛丁文秀宋健巍王星宁
Owner GEM JIANGSU COBALT IND CO LTD
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