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Lithium-enriched manganese-based positive electrode material and preparation method thereof

A cathode material, lithium-rich manganese-based technology, applied in the field of lithium-rich manganese-based cathode materials and their preparation, can solve problems such as insufficient stability and performance degradation, achieve good charge-discharge specific capacity, complete development of layered structure, and improve The effect of high rate and long cycle stability

Inactive Publication Date: 2019-04-26
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a lithium-rich manganese-based positive electrode material with a three-layer core-shell spherical structure and a preparation method thereof, so as to solve the problem of insufficient stability of existing lithium-rich manganese-based solid solution positive electrode materials and poor performance under high-rate conditions. recession and other disadvantages

Method used

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  • Lithium-enriched manganese-based positive electrode material and preparation method thereof
  • Lithium-enriched manganese-based positive electrode material and preparation method thereof
  • Lithium-enriched manganese-based positive electrode material and preparation method thereof

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Embodiment 1

[0029] According to the proportion of metal ions, nickel sulfate, cobalt sulfate and manganese sulfate are respectively configured into bottom liquid, feed liquid 1, feed liquid 2 and feed liquid 3; the ratio of Ni, Co and Mn metal ions in the bottom liquid is 1:1:3.5, and the feed liquid The ratio of Ni, Co and Mn metal ions in solution 1 is 1:1:3.5, the ratio of Ni, Co and Mn metal ions in material solution 2 is 1:1:4, and the ratio of Ni, Co and Mn metal ions in material solution 3 is 1:1:4.5;

[0030] Put 6L of the bottom liquid into the reaction kettle and stir at a stirring speed of 450rpm. When the temperature in the kettle is 45°C, add 2mol / L of sodium carbonate solution as a precipitant and 0.3mol / L of ammonia as a complexing agent to adjust the bottom liquid. pH value to 8.0; Feed liquids 1, 2, and 3 are put into the reaction kettle in turn, and sodium carbonate solution and ammonia water are used to keep the pH value in the reaction kettle unchanged during the addit...

Embodiment 2

[0040] According to the proportion of metal ions, nickel sulfate, cobalt sulfate and manganese sulfate are respectively configured into bottom liquid, feed liquid 1, feed liquid 2 and feed liquid 3; the ratio of Ni, Co and Mn metal ions in the bottom liquid is 1:1:1, and the feed liquid The ratio of Ni, Co and Mn metal ions in solution 1 is 1:1:1, the ratio of Ni, Co and Mn metal ions in material solution 2 is 1:1:1.3, and the ratio of Ni, Co and Mn metal ions in material solution 3 is 1:1:4;

[0041] Put 6L of the bottom solution into the reactor and stir at a stirring speed of 550rpm. When the temperature in the reactor is 55°C, add 3mol / L of sodium carbonate solution as a precipitant and 0.4mol / L of ammonia as a complexing agent to adjust the bottom. The pH value in the liquid reaches 9.0; Feed liquids 1, 2, and 3 are sequentially entered into the reactor, and sodium carbonate solution and ammonia water are used to keep the pH value in the reactor constant during the additi...

Embodiment 3

[0045] According to the ratio of metal ions, nickel nitrate, cobalt nitrate, and manganese nitrate are respectively configured into bottom liquid, feed liquid 1, feed liquid 2, and feed liquid 3; the ratio of Ni, Co and Mn metal ions in the bottom liquid is 1:1:4, and the feed liquid The ratio of Ni, Co and Mn metal ions in solution 1 is 1:1:5, the ratio of Ni, Co and Mn metal ions in material solution 2 is 1:1:5, and the ratio of Ni, Co and Mn metal ions in material solution 3 is 1:1:7;

[0046] Put 6L of bottom liquid into the reaction kettle and stir at a stirring speed of 500rpm. When the temperature in the kettle is 50°C, add 3mol / L sodium carbonate solution as a precipitant and 0.4mol / L ammonia water as a complexing agent to adjust the bottom liquid. pH value to 8.5; Feed liquids 1, 2, and 3 are put into the reaction kettle in turn, and sodium carbonate solution and ammonia water are used to keep the pH value in the reaction kettle unchanged during the addition process; ...

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Abstract

The invention belongs to the field of positive electrode materials of electrochemistry, and particularly relates to a lithium-enriched manganese-based positive electrode material and a preparation method thereof. Three kinds of material liquid containing different metal ion proportions are subjected to reaction precipitation successively, weak acid sodium salt is taken as a precipitator, an alkaline salt solution is taken as a complexing agent, and a weak acid salt precursor of a stable interface structure with three layers of different metal ion concentrations is generated; the weak acid saltprecursor is fully mixed with a certain number of lithium sources, and after the high-temperature solid-phase reaction, the lithium-enriched manganese-based positive electrode material of a three-layer core shell sphere structure is prepared; components of the three-layer core shell structure are subjected to gradient from inside to outside, so that the difference between metal ion concentrationsof adjacent layers is smaller, the interface structure is more stable, and therefore the electrochemical performance of the material is effectively improved; the prepared material has quite excellentcirculation stability performance, quite excellent multiplying power performance and long cycle life performance.

Description

technical field [0001] The invention belongs to the field of electrochemical cathode materials, and in particular relates to a lithium-rich manganese-based cathode material and a preparation method thereof. Background technique [0002] Since the beginning of the 21st century, global issues such as the deterioration of environmental pollution, climate warming caused by the greenhouse effect, and the shortage of petroleum and mineral resources have attracted widespread attention. The traditional automobile industry is one of the main reasons for these problems. Due to its advantages such as cleanliness and no emission (or low emission), new energy vehicles have become the most important direction of current automobile development. Among them, the power battery, as the power source or one of the power sources of the new energy vehicle, is its core link. The current industrialized new energy vehicle power batteries are mainly lithium-ion batteries, and most of the cathode mat...

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 栗欢欢孙浩瀚饶维宁王亚平江浩斌陈龙
Owner JIANGSU UNIV
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