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Single-crystal appearance layered nickel lithium manganate positive electrode material and preparation method thereof

A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the field of layered lithium nickel manganese oxide positive electrode materials and its preparation, can solve problems such as lack of coordination, nickel-lithium mixed row, and influence on the electrochemical performance of positive electrode materials, and achieve electrochemical performance. Excellent performance, improved volume energy density, and improved structural stability

Active Publication Date: 2019-05-28
GUANGDONG BRUNP RECYCLING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It should be pointed out that, compared with the traditional layered NCM ternary cathode material, due to the lack of Co in the lattice structure of LiNiMnO 3+ Slight segregation of nickel-manganese components will have a significant impact on the performance of the material, usually manifested as serious mixing of nickel and lithium, thus affecting the electrochemical performance of the positive electrode material

Method used

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  • Single-crystal appearance layered nickel lithium manganate positive electrode material and preparation method thereof
  • Single-crystal appearance layered nickel lithium manganate positive electrode material and preparation method thereof
  • Single-crystal appearance layered nickel lithium manganate positive electrode material and preparation method thereof

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Embodiment 1

[0049] Nickel nitrate and manganese nitrate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.6mol / L. Ammonia water is used as a complexing agent, and the three components are introduced into the reactor with equal volumes by a peristaltic pump. The reaction temperature is controlled at 50±0.5°C, the pH value is 9±0.2, and the stirring speed is 1200r / min. After reacting for 20 h, the obtained precipitate was washed with deionized water for 3 times, and then dried at 120 ° C for 18 h under a nitrogen protective atmosphere to obtain the nickel manganese double hydroxide precursor Ni 0.5 mn 0.5 (OH) 2 , its D 50 is 4.4μm, BET is 87.4m 2 / g.

[0050] The above precursor was pre-calcined at 500°C for 4 hours, and the product obtained was the precursor of nickel manganese oxide. The oxide precursor obtained by pre-calcination maintains the sheet-like structure of the double hydroxide primary particle, and at...

Embodiment 2

[0054] Nickel nitrate and manganese sulfate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.5 mol / L. At the same time, sodium hydroxide with the same volume and concentration was prepared as a precipitating agent. Ammonia water is used as a complexing agent, and the three components are introduced into the reactor with equal volumes by a peristaltic pump. The reaction temperature is controlled at 80±0.5°C, the pH value is 10.5±0.2, and the stirring speed is 700r / min. After reacting for 13 hours, the precipitate obtained was washed with deionized water for 3 times, and then dried at 115°C for 28 hours under a nitrogen protective atmosphere to obtain the nickel-manganese double hydroxide precursor Ni 0.5 mn 0.5 (OH) 2 , its D 50 3.9μm, BET 98.1m 2 / g.

[0055] The above precursor was pre-calcined at 550° C. for 3 hours, and the product obtained was the precursor of nickel manganese oxide.

[0056] The ...

Embodiment 3

[0059] Nickel acetate and manganese acetate were dissolved in deionized water at a molar ratio of 1:1 to prepare a salt solution with a metal ion concentration of 0.9mol / L. At the same time, the same volume and concentration of sodium carbonate was prepared as a precipitant, and 0.8mol / L ammonia water As a complexing agent, the three components are introduced into the reactor with equal volumes by a peristaltic pump, the reaction temperature is controlled at 65±0.5°C, the pH value is 12.0±0.2, and the stirring speed is 1000r / min. After reacting for 9 hours, the obtained precipitate was washed with deionized water for 3 times, and then dried at 130°C for 18 hours under a nitrogen protective atmosphere to obtain the nickel manganese carbonate precursor Ni 0.5 mn 0.5 CO 3 , its D 50 is 3.6μm, BET is 115.8m 2 / g.

[0060] The above precursor was pre-calcined at 480° C. for 6 hours, and the product obtained was the precursor of nickel manganese oxide.

[0061] The above-mentio...

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Abstract

The invention discloses a single-crystal appearance layered nickel lithium manganate positive electrode material and a preparation method thereof. The single-crystal appearance layered nickel lithiummanganate positive electrode material is prepared by the following preparation method with the steps of (1) performing preparation to obtain nickel manganese precursors by using nickel salts and manganese salts by a wet chemical method, wherein the mol ratio of the Ni to Mn is 1:1; (2) performing pre-sintering on the nickel manganese precursors to obtain the nickel manganese oxide precursors; (3)mixing the nickel manganese oxide precursors with Li source and M source additives; then, performing calcination to obtain the single-crystal appearance layered nickel lithium manganate positive electrode material. The advantage that the single crystal particle has the theory density is sufficiently achieved, so that the compaction density of an electrode plate made of positive electrode materialscan be improved, so that the volume energy density of a lithium ion battery is improved. The defects inside the single crystal particles can be greatly reduced; the structure stability of the positive electrode material in the charging and discharging process can be effectively improved, so that the service life of the lithium ion battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a layered lithium nickel manganese oxide cathode material with a single crystal morphology and a preparation method thereof. Background technique [0002] In multi-element cathode material LiMO 2 Among them, nickel is the main electrochemically active substance, endowing the material with high capacity; cobalt can improve the conductivity and rate performance of the material, and can reduce the electrochemical polarization of the positive electrode material; manganese can improve the structural stability and The role of thermal stability. The synergistic effect of two or three elements in nickel-cobalt-manganese makes the multi-component cathode material have good structural stability and comprehensive electrochemical performance, and has certain advantages in terms of safety performance, cycle performance and cost. Among them, binary layered lithium nicke...

Claims

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Application Information

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IPC IPC(8): C30B29/22C30B1/10C30B29/64H01M4/505H01M4/525H01M10/0525
CPCY02E60/10
Inventor 汪乾刘婧婧阮丁山唐盛贺李长东
Owner GUANGDONG BRUNP RECYCLING TECH
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