A phosphorus doped lithium-rich manganese-based cathode material for lithium ion battery and a preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that the synthesis method is not suitable for industrial production, development and promotion restrictions, uneven doping effect, etc., and achieve excellent development Foreground, improvement of overall performance, effect of cycle stability improvement

Active Publication Date: 2019-01-18
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, there are obvious defects in the current phosphorus doping methods, which mainly include the synthesis of sol-gel, hydrothermal and other methods, but these synthesis methods are not suitable for industrial production, and the development and promotion are obviously limited; The body is mixed with related phosphorus compounds, and then prepared by high-temperature sintering. The process is cumbersome, and only the surface can be doped, and the doping effect is not uniform.

Method used

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  • A phosphorus doped lithium-rich manganese-based cathode material for lithium ion battery and a preparation method thereof
  • A phosphorus doped lithium-rich manganese-based cathode material for lithium ion battery and a preparation method thereof
  • A phosphorus doped lithium-rich manganese-based cathode material for lithium ion battery and a preparation method thereof

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Embodiment 1

[0042] A method for preparing a phosphorus-doped lithium-rich manganese-based positive electrode material for a lithium-ion battery, characterized in that it specifically comprises the following steps:

[0043] (1) Preparation of precipitant solution: dissolving sodium carbonate in deionized water to form a solution with a molar concentration of 2mol / L; then adding sodium pyrophosphate and stirring until fully dissolved to obtain a precipitant solution; wherein sodium pyrophosphate and The molar ratio of precipitant is 2:100;

[0044] (2) Preparation of metal salt solution: first weigh manganese sulfate monohydrate, nickel sulfate hexahydrate and cobalt sulfate heptahydrate according to a molar ratio of 4:1:1; then dissolve in deionized water to prepare a 2mol / L metal salt solution;

[0045](3) Preparation of phosphorus-doped nickel-cobalt-manganese carbonate precursor: under the stirring condition of 800r / min, the metal salt solution and the precipitant solution were added dr...

Embodiment 2

[0048] A method for preparing a phosphorus-doped lithium-rich manganese-based positive electrode material for a lithium-ion battery, characterized in that it specifically comprises the following steps:

[0049] (1) Preparation of precipitant solution: Potassium carbonate is dissolved in deionized water to be configured into a solution with a molar concentration of 1mol / L; then sodium pyrophosphate is added and stirred until completely dissolved to obtain a precipitant solution; wherein sodium pyrophosphate and The molar ratio of precipitant is 5:100;

[0050] (2) Preparation of metal salt solution: first weigh manganese nitrate tetrahydrate, nickel nitrate hexahydrate and cobalt nitrate hexahydrate according to the molar ratio of 4:1:1; then dissolve in deionized water to prepare a 1mol / L metal salt solution;

[0051] (3) Preparation of phosphorus-doped nickel-cobalt-manganese carbonate precursor: under the condition of 900r / min stirring, the metal salt solution and the precip...

Embodiment 3

[0054] A method for preparing a phosphorus-doped lithium-rich manganese-based positive electrode material for a lithium-ion battery, characterized in that it specifically comprises the following steps:

[0055] (1) Preparation of precipitant solution: Potassium hydroxide is dissolved in deionized water to be configured into a solution with a molar concentration of 1mol / L; then potassium pyrophosphate is added and stirred until completely dissolved to obtain a precipitant solution; wherein sodium pyrophosphate and The molar ratio of precipitant is 3:100;

[0056] (2) Preparation of metal salt solution: first weigh manganese chloride tetrahydrate, nickel chloride hexahydrate and cobalt chloride hexahydrate according to the molar ratio of 6:3:1; then dissolve them in deionized water to prepare 1mol / L metal salt solution saline solution;

[0057] (3) Preparation of phosphorus-doped nickel-cobalt-manganese carbonate precursor: under the stirring condition of 1300r / min, the metal s...

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Abstract

The invention discloses a preparation method of a phosphorus-doped lithium-rich manganese-based cathode material for a lithium ion battery, in particular comprising the steps of preparing precipitantsolution, preparing metal salt solution, preparing phosphorus-doped nickel-cobalt-manganese carbonate precursor, and preparing phosphorus-doped lithium-rich manganesebased cathode material; The precursor of phosphorus-doped Ni-Co-Mn compound can be obtained by dissolving the pyrophosphate compound as phosphorus source in precipitant solution and coprecipitating, and the phosphorus-doped lithium-rich manganesebased cathode material can be obtained by sintering at high temperature. The preparation method disclosed by the invention is simple, and the prepared cathode material is not only doped with phosphorus on the surface, but also evenly doped with phosphorus inside the material, so that the performance of the material is stable, the service life is long, and the capacity, the first effect, the ratio and the cycle stability of the material are remarkably improved.

Description

technical field [0001] The invention relates to the technical field of material synthesis, in particular to a method for preparing a phosphorus-doped lithium-rich manganese-based positive electrode material for a lithium ion battery. Background technique [0002] Energy and environmental protection are two major problems faced by human beings. The development of green and pollution-free new energy and energy storage equipment is a hot research topic now. Lithium batteries have attracted more and more attention because of their high energy density and environmental protection during use. With the development of transportation equipment such as electric vehicles, higher and higher requirements are put forward for the performance of lithium batteries, which makes it difficult for traditional lithium ion battery cathode materials to meet the use requirements. Lithium-rich manganese-based cathode materials for lithium-ion batteries, as an advanced electrode material, are conside...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 王振波王敏君玉富达隋旭磊赵磊
Owner HARBIN INST OF TECH
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