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Positive electrode solid solution material precursor, preparation method and application thereof

A precursor and cathode technology, applied in the field of cathode solid solution material precursor and its preparation, can solve the problems of low electrical conductivity, poor thermal stability, low electronic conductivity, etc., and achieve excellent performance and good structural stability. Effect

Active Publication Date: 2021-12-28
TIANJIN ENERGIES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The positive electrode material has low electronic conductivity and poor rate performance caused by Li / Ni mixed arrangement. In the state of high delithiation, Ni 4+ The strong oxidizing property tends to reduce to Ni 3+ while releasing O 2 poor thermal stability
[0008] The above schemes have problems such as poor cycle stability, poor rate performance, or low electrical conductivity. Therefore, it is necessary to develop a precursor with good cycle stability, good rate performance, and high electronic conductivity for use in lithium-ion battery cathode materials.

Method used

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  • Positive electrode solid solution material precursor, preparation method and application thereof
  • Positive electrode solid solution material precursor, preparation method and application thereof
  • Positive electrode solid solution material precursor, preparation method and application thereof

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Embodiment 1

[0047] This embodiment provides a positive electrode solid solution material precursor, characterized in that the preparation method of the positive electrode solid solution material precursor is as follows:

[0048] (1) nickel sulfate, cobalt sulfate, manganese sulfate, zinc sulfate, magnesium sulfate, chromium sulfate are dissolved in deionized water, and solution A is prepared;

[0049] (2) Dissolve tin sulfate and aluminum sulfate in 10L of 0.5M IDS solution, prepare solution B, and prepare 10L of a complexing agent with a concentration of 0.4M, that is, ammonia solution, and add 0.02M sodium tungstate as a tungsten source to obtain Solution C;

[0050] (3) Add 5L of deionized water to the 30L reactor, and add 200mL of 25% concentrated ammonia water as the bottom liquid, adjust the pH to 11, maintain the temperature at 50°C, and feed nitrogen into the reactor for 4 hours to maintain its inert gas environment, inject the prepared solution A, solution B and solution C into ...

Embodiment 2

[0052] This embodiment provides a positive electrode solid solution material precursor, characterized in that the preparation method of the positive electrode solid solution material precursor is as follows:

[0053] (1) nickel sulfate, cobalt sulfate, manganese sulfate, magnesium sulfate, chromium sulfate are dissolved in deionized water to prepare solution A;

[0054] (2) Dissolve aluminum sulfate and zirconium sulfate in 10L of 0.5M IDS solution, prepare solution B, and prepare 10L of a complexing agent with a concentration of 0.4M, that is, ammonia solution, and add 0.02M sodium tungstate as a tungsten source to obtain Solution C;

[0055] (3)) 5L of deionized water was added to the 30L reaction kettle, and 200mL of 25% concentrated ammonia water was added therein as the bottom liquid, the pH was adjusted to 11, the temperature was maintained at 50°C, and nitrogen gas was introduced into the reaction kettle for 4 hours to maintain its In an inert gas environment, inject t...

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Abstract

The invention provides a positive electrode solid solution material precursor, a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing a nickel source, a manganese source, a cobalt source and a first doped metal source with a solvent to obtain a mixed solution A; (2) dissolving a second doped metal source in a sodium iminodisuccinate solution to obtain a mixed solution B, and dissolving sodium tungstate in ammonia water to obtain a mixed solution C; and (3) heating by taking ammonia water as a base solution, adding the mixed solution A, the mixed solution B and the mixed solution C into the base solution, adjusting the pH value, and aging and filtering after the reaction is completed to obtain the positive electrode solid solution material precursor. According to the invention, the dosage of ammonia water in an experiment process is reduced, and simultaneous precipitation of various metal ions is promoted by adopting IDS.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a positive electrode solid solution material precursor and a preparation method and application thereof. Background technique [0002] With the process of economic globalization and the extensive use of fossil fuels, the problems of environmental pollution and energy shortage are becoming more and more serious. In order to reduce pollution during the use of fossil fuels, the development of sustainable renewable energy, new power batteries and high-efficiency energy storage systems, and the rational allocation of renewable resources are of great strategic significance for solving the energy crisis and protecting the environment. As a new type of high-energy green battery, lithium-ion battery has attracted much attention. Compared with other energy storage systems, its outstanding advantages are high storage energy per unit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/131H01M4/1391H01M4/525H01M4/505H01M10/0525
CPCC01G53/44H01M4/131H01M4/1391H01M4/525H01M4/505H01M10/0525Y02E60/10
Inventor 郭建高秀玲
Owner TIANJIN ENERGIES
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