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Preparation method of layered lithium-rich sosoloid cathode material

A positive electrode material and solid solution technology, which is applied in the field of preparation of layered lithium-rich solid solution positive electrode materials, can solve the problems of undisclosed literature and patents on the stability control of total alkali content on the surface, and achieve high-temperature cycle and storage performance. The effect of low cost and simple preparation process

Active Publication Date: 2015-04-15
BEIJING EASPRING MATERIAL TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the literature or patent reports, there are few reports on the impact of the total alkali content on the surface of the layered lithium-rich solid solution cathode material on the high-temperature cycle and storage performance, and the literature and patents on the stability control of the surface total alkali content have not been published.

Method used

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  • Preparation method of layered lithium-rich sosoloid cathode material
  • Preparation method of layered lithium-rich sosoloid cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1.2 According to the molecular formula of step 1, weigh an excess of Li with a molar ratio of 5% 2 CO 3 , will Li 2 CO 3 After mixing with the precursor obtained in step 1.2, heat up to 550°C for sintering in air or an oxygen-containing atmosphere for 6 hours, and then heat up to 850°C for high-temperature sintering for 10 hours. That is, the intermediate product of the layered lithium-rich manganese-based material is obtained.

[0030] 2. Layered lithium-rich solid solution material reduces surface residual alkali steps:

[0031]Dissolve the layered lithium-rich solid solution material in step 1.2 in deionized water equivalent to 100% by weight, slurry, stir and wash at 75°C for 3 times until the powder pH<10.8, filter and dry it to obtain the positive electrode active material.

[0032] 3. Surface coating modification steps of layered lithium-rich solid solution materials:

[0033] 100g of the lithium-rich solid solution cathode material synthesized above and 50...

Embodiment 2

[0037] 1.2 Weigh an excess of 10% LiOH according to the molecular formula in step 1, mix LiOH with the precursor obtained in step 1, heat up to 600°C for 5 hours in air or an oxygen-containing atmosphere, and then heat up to 900°C for 12 hours at high temperature . That is, the intermediate product of the layered lithium-rich manganese-based material is obtained.

[0038] 2. Layered lithium-rich solid solution material reduces surface residual alkali steps:

[0039] Dissolve the layered lithium-rich solid solution material precursor in step 2 in deionized water equivalent to 200% by weight of it, rinse it at 50°C for 4 times until the powder pH<10.5, filter and dry it to obtain the positive electrode active material.

[0040] 3. Surface coating modification steps of layered lithium-rich solid solution materials:

[0041] 100g of the lithium-rich solid solution cathode material synthesized above and 30g of ZrO with a solid content of 0.25% 2 The nano-suspension suspension i...

Embodiment 3

[0045] 1.2 According to the molecular formula of step 1, weigh an excess of 15% Li with a molar ratio 2 CO 3 , will Li 2 CO 3 After mixing with the precursor obtained in step 1, heat up to 600° C. for sintering in air or an oxygen-containing atmosphere for 5 hours, and then heat up to 880° C. for high-temperature sintering for 15 hours. That is, a layered lithium-rich solid solution material intermediate is obtained.

[0046] 2. Layered lithium-rich solid solution material reduces surface residual alkali steps:

[0047] Dissolve the layered lithium-rich solid solution material precursor in step 2 in deionized water equivalent to 200% by weight, slurry, stir and wash twice at 90°C, then rinse with pure water until the powder pH<10.5, It was filtered and dried to obtain the positive electrode active material.

[0048] 3. Surface coating modification steps of layered lithium-rich solid solution materials:

[0049] 150 g of the lithium-rich manganese-based cathode material s...

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Abstract

The invention discloses a preparation method of a layered lithium-rich sosoloid cathode material. In the preparation method, the excess lithium source is sintered, then the sintered lithium source is washed by water, and then the processed intermediate is subjected to surface modification so as to obtain the cathode material. Through the technical scheme mentioned above, the mixed arrangement of Li+ and Ni2+ in the cathode material is effectively reduced, at the same time, the alkali residues on the cathode material surface are reduced, and the stability of the cathode material is improved. The cathode material prepared by the provided preparation method has the characteristics of good high temperature cycling performance, good storage performance, good rate capability, simple and easy preparation process, and low cost.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a method for preparing a layered lithium-rich solid solution positive electrode material. Background technique [0002] In recent years, layered lithium-rich solid solution cathode materials have attracted extensive attention due to their unusual electrochemical properties such as high specific capacity (200-300 mAh / g), excellent cycle capability, and new electrochemical charge-discharge mechanism. It is currently commercialized mainstream cathode material LiCoO 2 Great substitute. [0003] In a broad sense, the composition of all layered lithium-rich solid solution cathode materials can be in the range of Li(Li 1 / 3 mn 2 / 3 )O 2 — LiCoO 2 — LiNiO 2 — LiNi 0.5 mn 0.5 o 2 Found in the quaternary phase diagram, the stoichiometric formula can be written as xLi(Li 1 / 3 mn 2 / 3 )O 2 ·(1-x)LiMO 2 or Li 1+x m 1-x o 2 (0<x<1). Among them, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/1391H01M4/505H01M4/525H01M2004/028Y02E60/10
Inventor 冯海兰龚金保陈彦彬刘亚飞
Owner BEIJING EASPRING MATERIAL TECH CO LTD
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