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A kind of positive electrode material, its preparation method and lithium ion battery

A positive electrode material and lithium compound technology, applied in the field of lithium ion electrodes, can solve the problems of difficulty in exerting the synergistic effect of ternary materials and lithium manganate, poor battery rate performance, and inability to increase battery energy density.

Active Publication Date: 2021-05-25
宁波富理电池材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation of materials by this method cannot improve the energy density of the battery. Under the condition of increasing the charging voltage of the battery, the rate performance of the battery is relatively poor. Lithium reacts, which easily leads to uneven product components, and it is difficult to exert the synergistic effect of ternary materials and lithium manganate

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  • A kind of positive electrode material, its preparation method and lithium ion battery
  • A kind of positive electrode material, its preparation method and lithium ion battery
  • A kind of positive electrode material, its preparation method and lithium ion battery

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preparation example Construction

[0045] The present invention also provides a preparation method of positive electrode material, comprising the following steps:

[0046] A) Disperse the compound containing M element in LiNi x co y mn z o 2 The interior of the particle, to obtain an intermediate product;

[0047] The compound containing M element is selected from Ti-containing compound, V-containing compound, Cr-containing compound, Mn-containing compound, Fe-containing compound, Co-containing compound, Ni-containing compound, Zr-containing compound, Nb-containing compound and Mo-containing compound one or more;

[0048] 0≤x≤1.0, 0≤y≤1.0, 0≤z≤1.0, and x+y+z=1;

[0049] B) The intermediate product is mixed with the lithium compound and then heat-treated to obtain the positive electrode material.

[0050] In the present invention, the compound containing M element is preferably titanium hydroxide, metatitanic acid, titanium oxalate, titanium acetate, titanium oxide, ethyl titanate, tetrabutyl titanate, amm...

Embodiment 1

[0068] Nickel sulfate, cobalt sulfate, manganese sulfate are mixed with water to obtain a mixed solution, the mol ratio of the nickel ion in the nickel sulfate, the cobalt ion in the cobalt sulfate and the manganese ion in the manganese sulfate is 0.8:0.1:0.1. The mixed solution, complexing agent, and precipitating agent are mixed, and the positive electrode material precursor is obtained after the reaction; the positive electrode material precursor is mixed and sintered with lithium hydroxide to obtain LiNi 0.8 co 0.1 mn 0.1 o 2 , sintered at 900°C, sintered for 18h, the specific surface area test, the obtained LiNi 0.8 co 0.1 mn 0.1 o 2 The porosity between primary particles is 10%.

[0069] Will LiNi 0.8 co 0.1 mn 0.1 o 2 , manganese nitrate and 1L deionized water in a molar ratio of 1:0.05:1 to form a mixed solution; heat to evaporate the water completely to obtain LiNi containing manganese nitrate in the particle gap 0.8 co 0.1 mn 0.1 o 2 ;

[0070] Mix the...

Embodiment 2

[0074] Nickel sulfate, cobalt sulfate, manganese sulfate are mixed with water to obtain a mixed solution, the mol ratio of the nickel ion in the nickel sulfate, the cobalt ion in the cobalt sulfate and the manganese ion in the manganese sulfate is 0.5:0.2:0.3, the The mixed solution, complexing agent, and precipitating agent are mixed, and the positive electrode material precursor is obtained after the reaction; the positive electrode material precursor is mixed and sintered with lithium hydroxide to obtain LiN i0.5 co 0.2 mn 0.3 o 2 , sintered at 1000°C, sintered for 24h, the specific surface area test, the obtained LiN i0.5 co 0.2 mn 0.3 o 2 The porosity between primary particles is 20%.

[0075] Will LiNi 0.5 co 0.2 mn 0.3 o 2 , manganese sulfate and deionized water in a molar ratio of 1:0.02:0.5 to prepare a mixed solution; add 0.025mol sodium hydroxide and then fully stir; add deionized water to wash and dry to obtain a particle void containing manganese hydroxi...

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Abstract

The invention provides a positive electrode material, including LiNi x co y mn z o 2 particles and filled in LiNi x co y mn z o 2 Li between particles α m β o 2 ; M is selected from one or more of Ti, V, Cr, Mn, Fe, Co, Ni, Zr, Nb and Mo; 0≤α≤1.5, 0≤β≤1.5; 0≤x≤1.0,0 ≤y≤1.0, 0≤z≤1.0, and x+y+z=1; Li α m β o 2 with LiNi x co y mn z o 2 The molar ratio is (0.01~10):100. The present invention fills the gap between the primary particles of the positive electrode material with active material, and the filled Li α m β o 2 The material forms a three-dimensional skeleton structure, which can increase its compaction density, thereby increasing its energy density, while improving the cycle performance and rate performance of the material under high voltage. The invention also provides a preparation method of the cathode material and a lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion electrodes, and in particular relates to a positive electrode material and a preparation method thereof. Background technique [0002] At present, lithium-ion batteries have been widely used in electronic products, and the requirements for the use time of electronic products are getting higher and higher, but the portability of electronic products limits the size of lithium-ion batteries. The new energy vehicles driven by batteries have higher and higher requirements for mileage, but the comfort and practicality of the vehicle also limit the size of lithium-ion batteries. Therefore, improving the energy density of lithium-ion batteries has become an inevitable trend of lithium-ion batteries. [0003] The Chinese patent with the publication number CN201310126541.4 discloses the positive electrode material of lithium ion battery and its preparation method. Lithium cathode material. The materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 赛喜雅勒图夏永高刘兆平王雪莹
Owner 宁波富理电池材料科技有限公司