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Lithium metallic oxide precursor material with annual ring type structure, anode material prepared by lithium metallic oxide precursor material, and preparation method and application

A lithium metal oxide, cathode material technology, applied in the direction of positive electrodes, structural parts, active material electrodes, etc., can solve the problems of poor rate performance, increased production and preparation costs, low volume specific energy, etc., to improve discharge capacity and Rate performance, improved cycle stability, uniform particle size distribution

Active Publication Date: 2016-02-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of lithium-rich manganese-based cathode materials, such as low initial coulombic efficiency, poor rate performance, and gradual decrease in voltage during cycling, severely inhibit the large-scale application of lithium-rich manganese-based cathode materials.
[0008] At present, the electrochemical performance of positive electrode materials is mainly improved through surface modification, metal ion doping, nanomaterials, acid treatment, and synthetic gradient materials, but none of them can fundamentally solve the problems existing in materials, including the increase in production and preparation costs. , poor rate and cycle performance, low volume specific energy and low tap density, etc., so finding a simple method to improve the overall electrochemical performance of the material without affecting the industrial application of the material has always been a research topic hotspot

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  • Lithium metallic oxide precursor material with annual ring type structure, anode material prepared by lithium metallic oxide precursor material, and preparation method and application
  • Lithium metallic oxide precursor material with annual ring type structure, anode material prepared by lithium metallic oxide precursor material, and preparation method and application
  • Lithium metallic oxide precursor material with annual ring type structure, anode material prepared by lithium metallic oxide precursor material, and preparation method and application

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specific Embodiment approach 1

[0042] Embodiment 1: The lithium metal oxide precursor material with "annual ring" structure of the present invention is spherical secondary particles formed by agglomeration of primary particles, and the primary particles in the secondary particles are in the form of "annual rings" Formula arrangement, the chemical formula of the primary particle is Ni x co y mn z m 1-x-y-z (OH) 2 or Ni x co y mn z m 1-x-y-z CO 3 , where 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z≤1, M is Zr, Fe, Sm, Pr, Nb, Ga, Zn, Y, Mg, Al, One or more of Cr, Ca, Na, Ti, Cu, K, Sr, Mo, Ba, Ce, Sn, Sb, La, Bi.

specific Embodiment approach 2

[0043] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the average particle size of the secondary particles is 1 μm to 40 μm, and the tap density is 1 g / cm 3 ~4g / cm 3 . Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0044] Specific embodiment three: The preparation method of the lithium metal oxide precursor material with the "annual ring" structure of this embodiment, the lithium metal oxide precursor material is prepared according to the following steps:

[0045] 1. According to the chemical formula Ni x co y mn z m 1-x-y-z (OH) 2 or Ni x co y mn z m 1-x-y-z CO 3 , where 0≤x≤1, 0≤y≤1, 0≤z≤1, x+y+z≤1, nickel salt and cobalt salt are weighed according to the stoichiometric ratio of nickel, cobalt, manganese and M metal elements , manganese salt and M salt, nickel salt, cobalt salt, manganese salt and M salt are dissolved in water to form a mixed metal salt solution a1 with a concentration of 0.1mol / L to 10mol / L; wherein M is Zr, Fe, Sm, One or more of Pr, Nb, Ga, Zn, Y, Mg, Al, Cr, Ca, Na, Ti, Cu, K, Sr, Mo, Ba, Ce, Sn, Sb, La, Bi;

[0046] 2. Separately configure a precipitant aqueous solution b1 with a concentration of 0.1mol / L-10mol / L and a complexing agent aqueous solution c...

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Abstract

The invention relates to lithium metallic oxide precursor material with an annual ring type structure, an anode material prepared by the lithium metallic oxide precursor material, and a preparation method and application, and in particular to the lithium metallic oxide precursor material for a lithium ion battery and a preparation method of the lithium metallic oxide precursor material, and the anode material prepared by the lithium metallic oxide precursor material, the preparation method and the application. The invention aims to solve the problems of small discharge capacity, poor circulating performance and low tap density of a common lithium metallic oxide anode material. According to the lithium metallic oxide precursor material with the annual ring type structure, the anode material prepared by the lithium metallic oxide precursor material, and the preparation method and the application, disclosed by the invention, the solid-to-liquid ratio of a solution in a coprecipitation reaction process is controlled to be in periodic linear variation in rear time by using an intermittent equivalent overflowing way; the prepared lithium metallic oxide precursor material and the anode material prepared by the lithium metallic oxide precursor material are used in the field of batteries.

Description

technical field [0001] The invention relates to a lithium metal oxide precursor material for a lithium ion battery and a preparation method, as well as a positive electrode material prepared from the material, a preparation method and an application. Background technique [0002] Lithium-ion batteries were commercialized in the 1990s and became the most important and widely used secondary batteries. Compared with traditional lead-acid batteries and nickel-based batteries, lithium-ion batteries are widely used in various industries because of their advantages such as high working voltage, small size, large specific energy, no memory effect, no pollution, small self-discharge, long cycle life and stable discharge performance. It has been widely used in portable electronic products. The "Energy Conservation and Development of New Energy Vehicle Industry Development Plan (2012-2020)" discussed and approved by the Standing Committee of the State Council in my country in 2012 cle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/1391H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 杜春雨陈诚尹鸽平左朋建程新群马玉林高云智
Owner HARBIN INST OF TECH
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