Positive electrode material for lithium-ion battery and preparation method of positive electrode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor rate performance, fast cycle attenuation, Li/Ni mixed discharge, etc., to improve charge and discharge rate performance and Cycle performance, effect of improving electrochemical performance

Active Publication Date: 2016-08-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thanks to Li + Radius and Ni 2+ The difference in radius is small, and it is easy to generate Li / Ni mixed discharge, resulting in problems such as the actual discharge capacity is much lower than the theoretical specific capacity, poor rate performance, and fast cycle attenuation.

Method used

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  • Positive electrode material for lithium-ion battery and preparation method of positive electrode material
  • Positive electrode material for lithium-ion battery and preparation method of positive electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] In this embodiment, when M=Co, x=0.06, and y=0, the chemical formula of the synthetic target product is LiNi 0.5 mn 0.44 co 0.06 o 2

[0020] (1) The hydroxide precursor material was prepared by co-precipitation method, and the molar ratio of Ni:Mn:Co was 0.5:0.44:0.06, and NiSO 4 ·6H 2 O, MnSO 4 ·H 2 O. CoSO 4 ·7H 2 Dissolve O in deionized water to prepare aqueous solution A with a cation concentration of 2mol / L; prepare 10mol / L ammonia water and 5mol / L NaOH solution at the same time; A is added to the reaction kettle at the same time, and 99.99% pure argon is introduced to protect it, and the pH is 11, and a precipitate is formed under stirring conditions; the solid obtained after the precipitate is washed and filtered is a hydroxide material of nickel manganese cobalt; the above precipitate Dry at 110°C to obtain solid powder;

[0021] (2) The molar ratio of Li:(Ni+Mn+Co) is 1.05:1, respectively weigh LiOH·H 2 O and the solid powder obtained in (1) are uni...

Embodiment 2

[0027]When M= Mg, x=0.04, y=0, the target product is LiNi 0.5 mn 0.46 Mg 0.04 o 2

[0028] (1) Preparation of hydroxide precursor materials by co-precipitation method: according to the cation molar ratio Ni:Mn:Mg is 0.5:0.46:0.04, respectively weigh NiSO 4 ·6H 2 O, MnSO 4 ·H 2 O, MgSO 4 ·7H 2 Dissolve O in deionized water to prepare aqueous solution A with a cation concentration of 1.5mol / L; prepare 5mol / L ammonia water and 5mol / L NaOH aqueous solution at the same time; A is added to the reaction kettle at the same time, and 99.99 wt.% purity nitrogen is introduced to protect it. At a pH of 10.8, a precipitate is formed under stirring conditions; the solid obtained after the precipitate is washed and filtered many times is a hydroxide material of nickel manganese magnesium; Calcining the above precipitate at 450°C to obtain a solid powder;

[0029] (2) According to the molar ratio Li:(Ni+Mn+Mg) is 1.02:1, weigh LiOH·H 2 O and the calcined product obtained in (1) are...

Embodiment 3

[0031] When M= Co, M′=Mg, x=0.02, y=0.02, the target product is LiNi 0.5 mn 0.46 co 0.02 Mg 0.02 o 2

[0032] (1) Preparation of hydroxide precursor materials by co-precipitation method: according to the metal cation molar ratio Ni:Mn:Co:Mg is 0.5:0.46:0.02:0.02, respectively weigh NiSO 4 ·6H 2 O, MnSO 4 ·H 2 O. CoSO 4 ·7H 2 O, MgSO 4 ·7H 2 Dissolve O in deionized water to prepare aqueous solution A with a cation concentration of 2.5mol / L; prepare 8mol / L ammonia water and 5mol / L NaOH aqueous solution at the same time; A is added to the reaction kettle at the same time, protected by argon with a purity of 99.99 wt.%, at a pH of 12, a precipitate is formed under stirring conditions, which is a hydroxide material of nickel manganese cobalt magnesium; the above precipitate is roasted at 800°C to obtain a metal oxide;

[0033] (2) The molar ratio of Li:(Ni+Mn+Co+Mg) is 1.02:1, respectively weigh LiOH·H 2 O and the calcined product obtained in (1) are uniformly mixed; ...

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Abstract

The invention relates to a positive electrode material for a lithium-ion battery and a preparation method of the positive electrode material, and belongs to the technical field of materials for lithium-ion batteries. A chemical general formula of the positive electrode material for the lithium-ion battery is LiNi<0.5>Mn<0.5-x-y>M<x>M'<y>, wherein x is greater than or equal to 0; y is greater than or equal to 0; and x+y is smaller than 0.1 and greater than 0. According to the method provided by the invention, by introducing low-valence metal cations, the valences of M and M' are lower than tetravalence; the material of which the chemical formula is LiNi<0.5>Mn<0.5-x-y>M<x>M'<y>O<2> is synthesized; the valence of Ni<2+> in the material rises due to a charge balance to generate a part of Ni<3+>; and the Ni<3+> and the Li<+> are not easily replaced with each other, so that mixed arrangement of Li / Ni is reduced; and the electrochemical properties of the material are improved.

Description

technical field [0001] The invention relates to a lithium-ion battery cathode material and a preparation method thereof, belonging to the technical field of lithium-ion battery materials. Background technique [0002] The advantages of lithium-ion batteries are high energy density, low self-discharge rate, good cycle performance, and no memory effect. Currently commercialized lithium-ion batteries for electronic portable devices mostly use lithium cobalt oxide and ternary materials with high energy density as active materials for the positive electrode materials, and mostly use graphite or silicon-based materials as the active materials for the negative electrode materials. Pole will add conductive agent and binder. [0003] The traditional cathode material lithium cobalt oxide (LiCoO 2 ) The cobalt resource in ) is relatively scarce, expensive, and has certain toxicity, so reducing the amount of cobalt or removing the cobalt element has become an important direction for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 杨桂玲高腾飞杨斌戴永年姚耀春方海升
Owner KUNMING UNIV OF SCI & TECH
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