Positive electrode material used for lithium ion batteries 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 high voltage tolerance, insufficient safety performance, and low cycle stability, so as to reduce dissolution and improve cycle The effect of stability

Inactive Publication Date: 2018-11-13
西安创昱新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a lithium-ion battery cathode material to solve the problems of poor high voltage tolerance, low cycle stability and insufficient safety performance in existing lithium-ion batteries

Method used

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  • Positive electrode material used for lithium ion batteries and preparation method of positive electrode material
  • Positive electrode material used for lithium ion batteries and preparation method of positive electrode material

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preparation example Construction

[0045] The present invention also provides a preparation method for the above-mentioned lithium-ion battery cathode material, which specifically includes the following steps:

[0046] Step 1, preparing the host material lithium-containing transition metal oxide Li x m y N 1-y o 2-α A β ;

[0047] The specific process of step 1 is as follows:

[0048] Choose a one-step method or a two-step method to prepare the host material. The one-step method refers to the raw material containing the desired transition metal element M, the Li source, the raw material containing the desired doping element N, and the raw material containing the desired doping element A, Lithium-containing transition metal oxides Li x m y N 1- y o 2-α A β , the preparation process is carried out in the air or oxygen environment; the two-step method refers to that the raw material containing the desired transition metal element M is first passed through solid-phase ball milling method, liquid-phase co...

Embodiment 1

[0060] The host material of the positive electrode material prepared in this embodiment is LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the coating modification is MgO·SiO 2 . The thickness of the cladding layer is 15 nm, and the mass fraction of the cladding modifier in the positive electrode material is 0.2%. The specific preparation method is:

[0061] First, the host material precursor was prepared by co-precipitation method: the NiSO 4 、CoSO 4 , MnSO 4 Dissolve in deionized water according to the metal atomic ratio 1:1:1, and prepare a mixed solution with a total concentration of metal ions of 1mol / L; then add the prepared 1mol / L NaOH solution while stirring, and control the temperature during this process At 75°C, after full reaction, the evacuated secondary spherical granular coprecipitate will be obtained, and its average particle size is controlled at 18-20um (the average particle size of the primary particle is 1.0-1.2um); the resulting coprecipitate After being washed thre...

Embodiment 2

[0064] The host material of the positive electrode material prepared in this embodiment is LiNi 0.5 co 0.2 mn 0.3 o 2 , the coating modification material is CaO·SiO 2 . The thickness of the cladding layer is 10 nm, and the mass fraction of the cladding modifier in the positive electrode material is 0.3%. Concrete preparation steps are:

[0065] First, the host material precursor was prepared by co-precipitation method: the NiSO 4 、CoSO 4 , MnSO 4 Dissolve in deionized water according to the metal atomic ratio of 5:3:2, and prepare a mixed solution with a total concentration of metal ions of 1mol / L; then add the prepared 1mol / L NaOH solution while stirring, and control the temperature during this process At 75°C, after full reaction, the evacuated secondary spherical granular coprecipitate will be obtained, and its average particle size is controlled at 10-12um (the average particle size of the primary particle is 1.5-2.0um); the resulting coprecipitate After washing t...

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Abstract

The invention discloses a positive electrode material used for lithium ion batteries. The positive electrode material comprises a main body material and an interface modification object on the surfaceof the main body material, wherein the main body material is a lithium-containing transition metal oxide LixMyN(1-y)O(2-alpha)A(beta); the interface modification object on the surface of the main body material is alkaline earth metal silicate DaR<b+>2(1-a)/bO.zSicT(1-c)O(2-lambda)E(zeta), wherein x is greater than or equal to 0.8 and smaller than or equal to 1.3, y is greater than or equal to 0.6and smaller than or equal to 1.0, alpha is greater than or equal to 0 and smaller than or equal to 0.2, beta is greater than or equal to 0 and smaller than or equal to 0.4, a is greater than or equalto 0.3 and smaller than or equal to 1.0, c is greater than or equal to 0.3 and smaller than or equal to 1.0, z is greater than or equal to 0.1 and smaller than or equal to 20, lambda is greater thanor equal to 0 and smaller than or equal to 0.5, zeta is greater than or equal to 0 and smaller than or equal to 0.5, and the numerical value of b is determined by the element variety and occupied position of R. The invention further discloses a preparation method of the positive electrode material used for lithium ion batteries. The positive electrode material used for lithium ion batteries disclosed by the invention solves the problems such as low high voltage tolerance, low cycle stability and low safety performance existing in an existing lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a lithium ion battery positive electrode material, and also relates to a preparation method of the lithium ion battery positive electrode material. Background technique [0002] With the aggravation of energy and environmental crisis, people's demand for clean energy is becoming more and more urgent. As a high-efficiency energy storage tool, lithium-ion batteries are widely used in a wide range of applications. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, electrolytes and other accessories, among which the active material of the positive electrode (hereinafter referred to as "positive electrode material") plays a vital role in the overall performance of the battery. [0003] At present, there are three main types of cathode materials for commercial lithium-ion batteries: spinel structure LiM 2 o 4 (M is Ni, Co, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 房向鹏花春秀
Owner 西安创昱新材料科技有限公司
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