Lithium-based high-temperature carbon-absorbing material-modified positive electrode material and preparation method and application thereof

A technology of positive electrode materials and carbon materials, applied in the field of lithium-based high-temperature carbon-absorbing materials modified positive electrode materials, which can solve the problems of complicated procedures, no removal, and inability to solve the side reactions of residual lithium and electrolyte

Active Publication Date: 2018-02-09
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this method is complicated, and the material needs to be stirred and dispersed and post-treated. At the same time, the residual lithium on the surface is not removed, and the side reaction between the residual lithium and the electrolyte cannot be solved.

Method used

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  • Lithium-based high-temperature carbon-absorbing material-modified positive electrode material and preparation method and application thereof
  • Lithium-based high-temperature carbon-absorbing material-modified positive electrode material and preparation method and application thereof
  • Lithium-based high-temperature carbon-absorbing material-modified positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0066] (1) Weigh 1g tetraethyl orthosilicate solution with a silicon concentration of 0.5mol / L, 100mL lithium nitrate solution with a lithium concentration of 0.5mol / L, and 100g ternary cathode material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Stir evenly in a beaker, and air-dry at 200°C to obtain a uniform mixture;

[0067] (2) Take the above mixture and lithium hydroxide monohydrate, the addition of the two makes the molar content of each element in the final product (modified positive electrode material) meet Li 1.05 Ni 0.8 co 0.1 mn 0.1 o 2 According to the standard, the mechanical fusion is uniform, and sintered at a temperature of 800 ° C for 12 hours to obtain a lithium-ion battery ternary layered positive electrode material modified by lithium-based high-temperature carbon-absorbing material lithium silicate (that is, lithium-based high-temperature ), the modified cathode material is composed of cathode material Li 1.05 Ni 0.8 co 0.1 mn 0.1 o 2 and lithium-ba...

Embodiment 2

[0072] (1) Weigh 2g of zirconium oxychloride octahydrate solution with zirconium concentration of 0.25mol / L, 100mL of lithium hydroxide solution with lithium concentration of 0.5mol / L, and 100g of ternary cathode material precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 Stir evenly in a beaker, and air-dry at 300°C to obtain a uniform mixture;

[0073] (2) Take the above mixture and lithium hydroxide monohydrate, the addition of the two makes the molar content of each element in the final product (modified positive electrode material) meet Li 1.1 Ni 0.6 co 0.2 mn 0.2 o 2 According to the standard, three-dimensional mixing is uniform, and sintering at 900°C for 12 hours to obtain a lithium-based high-temperature carbon-absorbing material lithium zirconate-modified lithium-ion battery ternary layered positive electrode material (that is, a lithium-based high-temperature carbon-absorbing material modified positive electrode material) , the modified cathode material is composed of cat...

Embodiment 3

[0075] (1) Weigh 3g of tetraethyl orthosilicate solution with silicon concentration of 0.25mol / L, 150mL of lithium nitrate solution with lithium concentration of 1mol / L, and 80g of ternary positive electrode material precursor Ni 0.8 co 0.1 mn 0.1 (OH) 2 Stir evenly in a beaker, and air-dry at 150°C to obtain a uniform mixture;

[0076] (2) Take the above mixture and lithium hydroxide monohydrate, the addition of the two makes the molar content of each element in the final product (modified positive electrode material) meet Li 1.00 Ni 0.8 co 0.1 mn 0.1 o 2 Standard, uniform mechanical fusion, sintering at a temperature of 820 ° C for 14 hours, obtained a lithium-ion battery ternary layered positive electrode material modified by lithium-based high-temperature carbon-absorbing material lithium silicate (that is, lithium-based high-temperature carbon-absorbing material modified positive electrode material ), the modified cathode material is composed of cathode material Li...

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Abstract

The invention discloses a lithium-based high-temperature carbon-absorbing material-modified positive electrode material and a preparation method and application thereof in a lithium-ion battery. The lithium-based high-temperature carbon-absorbing material-modified positive electrode material is prepared from a positive electrode material and a lithium-based high-temperature carbon-absorbing material; and specifically, the lithium-based high-temperature carbon-absorbing material coats the positive electrode material to form primary particles, the primary particles are bridged to form secondaryparticles, and the secondary particles are coated to form the modified positive electrode material. The modified positive electrode material is in a multi-layer coating form, the coating effect generated by the structure is excellent and the conductivity is obviously strengthened; and when the modified positive electrode material is applied to the battery, one part of lithium in the lithium-basedhigh-temperature carbon-absorbing material is deintercalated to enter a negative electrode, so that the lithium consumed for generation of an SEI film of the negative electrode is compensated and theutilization rate of the lithium is improved. Volume changes in charge and discharge processes are effectively reduced through multi-coating, formation of microcracks of the positive electrode materialis reduced, meanwhile, side reaction of the positive electrode material and an electrolyte is effectively blocked, and the safety performance and the cycle performance of the material are improved.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and relates to a modified positive electrode material, its preparation method and application, in particular to a lithium-based high temperature carbon absorbing material modified positive electrode material, its preparation method and its application in lithium ion batteries. Background technique [0002] As the application range of lithium-ion batteries becomes wider and wider, higher and higher requirements are put forward for the energy density, safety and service life of lithium-ion battery cathode materials. [0003] Lithium-ion battery cathode active materials are the key materials of lithium-ion batteries, which have a great impact on the energy density, safety and service life of lithium-ion batteries. Common cathode active materials for lithium-ion batteries include lithium iron phosphate, lithium cobalt oxide, and lithium manganese oxide. , nickel-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 罗亮吴小珍杨顺毅黄友元庞钧友
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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