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Lithium metal oxide composite positive electrode material with multilayer structure, precursor material for constituting same, and preparation method and application for precursor material

A lithium metal oxide and composite positive electrode material technology, applied in structural parts, battery electrodes, electrochemical generators, etc., to achieve the effect of shortening the Li+ transmission path and improving the rate performance

Active Publication Date: 2016-05-04
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to solve the problem that a single lithium metal oxide positive electrode material is difficult to simultaneously take into account the comprehensive performance of specific capacity, cycle life, rate performance, safety and cost, and provides a lithium metal oxide positive electrode with a multi-layer structure The preparation method and application of composite materials; by changing and regulating the types of lithium metal oxide cathode materials in each layer of the multilayer structure, the respective performance advantages of different lithium metal oxides can be fully utilized to prepare high specific capacity and energy density and long cycle life. , good rate performance, safe and reliable high comprehensive performance lithium metal oxide cathode composite material for lithium ion batteries

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  • Lithium metal oxide composite positive electrode material with multilayer structure, precursor material for constituting same, and preparation method and application for precursor material
  • Lithium metal oxide composite positive electrode material with multilayer structure, precursor material for constituting same, and preparation method and application for precursor material
  • Lithium metal oxide composite positive electrode material with multilayer structure, precursor material for constituting same, and preparation method and application for precursor material

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specific Embodiment approach 1

[0040]Specific Embodiment 1: The precursor material of the lithium metal oxide composite positive electrode material with a multi-layer structure in this embodiment, the precursor material is composed of metal hydroxides or metal carbonates of different components along the spherical shape layer by layer The stacked structure is composed of at least three layers: inner layer, middle layer and outer layer. The number of layers can be realized by changing the number of middle layers by controlling the reaction time;

[0041] The specific structure is: the diameter of the inner layer is less than 8 μm, and the chemical composition is uniform; the middle layer is formed by growing and stacking layers of metal hydroxides or metal carbonates of different components around the inner layer, and the thickness of the middle layer is between 0.1 μm and 30 μm. Among them, the thickness of the single layer is between 100nm-300nm, and the outer layer is mainly precipitated by the unreacted m...

specific Embodiment approach 2

[0042] Specific embodiment two: the preparation method of the precursor material of the lithium metal oxide positive electrode composite material with a multilayer structure in this embodiment, the precursor material is prepared according to the following steps:

[0043] 1. Prepare the solution: prepare the precipitant aqueous solution b1 with a concentration of 0.2mol / L~4mol / L and the complexing agent aqueous solution c1 with a concentration of 0.2mol / L~4mol / L; dissolve the nickel salt in water to make a concentration of 0.1mol / L~10mol / L nickel salt solution, dissolve cobalt salt in water to make cobalt salt solution with a concentration of 0.1mol / L~10mol / L, dissolve manganese salt in water to make a concentration of 0.1mol / L ~10mol / L manganese salt solution, dissolving M salt in water to make M salt solution with a concentration of 0.1mol / L~10mol / L, and then preparing the inner layer metal salt solution and the middle layer metal salt solution, the inner layer The layer meta...

specific Embodiment approach 3

[0050] Specific Embodiment 3: The difference between this embodiment and specific embodiment 2 is that in step 4, the composition of the metal salt solution in the middle layer is replaced every cycle, and multiple layers of different lithium metal oxide cathode material precursors are prepared in the middle layer. The metal hydroxide or metal carbonate formed; other steps and parameters are the same as in the second embodiment.

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Abstract

The invention provides a lithium metal oxide composite positive electrode material with a multilayer structure, a precursor material for constituting the same, and a preparation method and an application for the precursor material. The invention relates to the lithium metal oxide composite positive electrode material used for a lithium ion battery, and a preparation method and an application for the lithium metal oxide composite positive electrode material. The invention aims to solve the ubiquitous problems of low specific capacity, bad cycling performance, high improvement cost and low tap density existing in the lithium metal oxide composite positive electrode material. According to the preparation method, primary granules are controlled in real time to be arranged based on layers in a coprecipitation method reaction process by enabling metal salt solution components to be subjected to stage changes and cease type overflowing; the metal salt components of the primary granules in each layer are different; a precursor of the high-performance lithium metal oxide composite positive electrode material with the multilayer structure is obtained; and the lithium metal oxide composite positive electrode material with the multilayer structure is finally synthesized by the combination of a gradient temperature rise way. The lithium metal oxide composite positive electrode material is used for the lithium ion battery.

Description

technical field [0001] The invention relates to a lithium metal oxide composite cathode material for a lithium ion battery, a preparation method and application thereof. Background technique [0002] With the progress of human society and the development of science and technology, human society will or has already faced two major problems. One is that non-renewable natural resources such as oil, coal mines, and natural gas are decreasing day by day; the second is environmental problems, environmental pollution, and ecological balance. It has brought great inconvenience to people's life. Therefore, the development of clean new energy is imminent. In the 21st century, people put forward higher standards for energy, and efficient, clean, economical, safe and renewable new energy has become the focus of attention. Therefore, opportunities and challenges coexist in the development of new energy sources, and the development of chemical power sources as an energy storage system c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/48H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
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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