Cathode material, preparation method of same, and lithium secondary battery

A positive electrode material, lithium pyrophosphate technology, applied in the direction of lithium batteries, battery electrodes, non-aqueous electrolyte batteries, etc., can solve the problems that affect the commercialization process, low diffusion rate, poor electrochemical performance, etc.

Active Publication Date: 2019-02-01
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But LiVOPO 4 Compared with LiFePO, the electronic conductivity and lithium ion diffusion rate 4 low, resulting in LiVOPO 4 The electrochemical performance such as cycle performance and rate performance is poor, which seriously affects its commercialization process

Method used

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  • Cathode material, preparation method of same, and lithium secondary battery
  • Cathode material, preparation method of same, and lithium secondary battery
  • Cathode material, preparation method of same, and lithium secondary battery

Examples

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Effect test

preparation example Construction

[0020] Next, the preparation method of the positive electrode material according to the second aspect of the present invention is described, which is used to prepare the positive electrode material of the first aspect of the present invention, including the steps: (1) adding excess lithium source, vanadium source, phosphorus source, and fluorine source to the solvent in proportion Mix in a medium to obtain a slurry, dry the slurry and sinter in a non-reducing atmosphere to obtain a precursor with an excess amount of lithium content relative to the target product fluorine-doped lithium vanadyl phosphate; (2) mix the precursor with a phosphorus source and a carbon source according to The ratio is added to a solvent and mixed to obtain a slurry. After the slurry is dried, it is sintered in an inactive atmosphere, so that an intermediate transition layer containing lithium pyrophosphate and a carbon layer surface coating layer are sequentially formed on the surface of the precursor,...

Embodiment 1

[0044] In the first step, the fluorine-doped lithium vanadyl phosphate is LiVO 0.95 f 0.05 PO 4 Excessive lithium source lithium carbonate, vanadium source ammonium metavanadate, phosphorus source ammonium dihydrogen phosphate, fluorine source lithium fluoride in an ethanol solvent according to the atomic molar ratio Li:V:P:F=1.2:1:1:0.05 Mixing is carried out, and then the mixture is transferred to a sand mill for grinding to obtain a slurry, and the slurry is dried and sintered at 600° C. for 4 hours in an air atmosphere to obtain a precursor with excess lithium content.

[0045] In the second step, the precursor obtained in the first step is mixed with the phosphorus source ammonium dihydrogen phosphate and the carbon source glucose in an ethanol solvent at a molar ratio of 1:0.1:0.5 of the precursor, the P atom, and the C atom, and then the The mixture was transferred to a sand mill for grinding to obtain a slurry. After drying the slurry, it was sintered at 750° C. for ...

Embodiment 2～14

[0047] The preparation method of the positive electrode materials of Examples 2-14 is the same as that of Example 1. The obtained positive electrode materials and process parameters such as raw material type, solvent type, sintering atmosphere, sintering temperature, and sintering time are shown in Table 1 and Table 2 for details.

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PUM

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Abstract

The invention provides a cathode material, a preparation method of same, and a lithium secondary battery. The cathode material has a core-shell structure and includes, successively from interior to exterior, a fluorine-doped lithium oxyvanadium phosphate core layer, a medium transition layer containing lithium pyrophosphate; and a carbon surface coating layer. The cathode material is high in lithium ion diffusion rate and electron conductivity, so that the lithium secondary battery with the cathode material has high first-discharge gram volume, excellent storage performance, cycle performanceand rate performance.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a positive electrode material, a preparation method thereof, and a lithium secondary battery. Background technique [0002] With the increasing application range of lithium-ion batteries, the requirements for energy density are getting higher and higher, and the cathode material is a key factor affecting the energy density of lithium-ion batteries. At present, the relatively mature cathode materials for commercialization include lithium cobalt oxide (LiCoO 2 ), lithium manganate (LiMn 2 o 4 ), nickel-cobalt-manganese ternary material (NCM), lithium iron phosphate (LiFePO 4 )Wait. In practical applications, these commercial cathode materials are more or less expensive, poor in safety performance, and low in energy density. Therefore, under the premise of ensuring safety performance, the development of cathode materials with higher energy density and lower cost than existing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M4/62H01M10/052
CPCH01M4/366H01M4/5825H01M4/583H01M4/625H01M10/052Y02E60/10
Inventor 吴关高旭光柳娜陶亮梁成都
Owner CONTEMPORARY AMPEREX TECH CO
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