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Lithium ion battery positive electrode material and preparation method

A technology for lithium-ion batteries and positive electrode materials, applied in the field of materials, can solve the problems of increased impedance of positive electrode materials, collapse of layered structure, crystal cracking, etc.

Active Publication Date: 2020-05-08
HUAWEI TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while improving the energy density of lithium-ion batteries, the problem is the attenuation of cycle life.
That is, during the charging process, when lithium ions are released from the crystal lattice of the positive electrode material, the lattice will undergo violent expansion and contraction changes, which will eventually lead to the collapse of the layered structure in the crystal of the positive electrode material, forming an inactive structure, resulting in irreversible damage. capacity loss
At the same time, with the repeated expansion and contraction of the crystal lattice, stress will be generated inside the crystal, forming lattice dislocation and slippage, and finally leading to crystal cracking
The electrolyte and the cracked fresh positive electrode material crystal surface will have a side reaction, which will increase the impedance of the positive electrode material and lead to the attenuation of cycle performance

Method used

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  • Lithium ion battery positive electrode material and preparation method
  • Lithium ion battery positive electrode material and preparation method
  • Lithium ion battery positive electrode material and preparation method

Examples

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Effect test

Embodiment 1

[0082] A lithium cobalt oxide positive electrode material with a filling layer, made of MgF 2 Constitute the filling layer, the matrix of the lithium cobalt oxide layered positive electrode material is LiCo 0.99 al 0.01o 2 , its preparation method comprises the following steps:

[0083] Co doped with 1% Al molar content 3 o 4 The precursor and lithium carbonate are mixed evenly in a molar ratio of Li:Co=1.05, placed in a muffle furnace at 1050°C, the sintering time is 12h, and the cooling rate is controlled at 10°C / min. After cooling to room temperature, the sintered product is pulverized , to obtain lithium cobalt oxide matrix material LiCo 0.99 Al 0.01 o 2 ;

[0084] Mix the lithium cobaltate base material and magnesium fluoride uniformly according to the molar ratio of 100:0.5, place it in a muffle furnace and sinter at 900°C for 6 hours, and then pulverize the sintered product to obtain cobaltate with a filled layer Lithium cathode material 0.05MgF 2 ·LiCo 0.99 ...

Embodiment 2

[0091] A high-nickel ternary cathode material with a filled layer, made of AlF 3 Constitute the filling layer, the matrix of the lithium cobalt oxide layered positive electrode material is LiNi 0.8 co 0.1 mn 0.1 o 2 , its preparation method comprises the following steps:

[0092] Nickel sulfate, cobalt sulfate, manganese sulfate are uniformly mixed according to the molar ratio of Ni: Co: Mn=0.8: 0.1: 0.1 to obtain a mixed solution A of 1.0mol / L, and the concentration is taken by weighing 20% ​​sodium hydroxide solution and removed Each 200g of deionized water was mixed uniformly to obtain 5mol / L mixed solution B; 100g concentrated ammonia water and 150g deionized water with a concentration of 20% were weighed and stirred uniformly to obtain 3.8mol / L mixed solution C. Weigh 300g, 400g, and 100g of the above mixed solution A, mixed solution B, and mixed solution C respectively, add 1300g of pure water to the reactor, and add mixed solution A, mixed solution B, and mixed solu...

Embodiment 3

[0097] A lithium-rich manganese-based positive electrode material with a filled layer consisting of TiO 2 Constitute the filling layer, and the matrix of the lithium-rich manganese-based layered positive electrode material is LiNi 0.8 co 0.1 mn 0.1 o 2 , its preparation method comprises the following steps:

[0098] Nickel sulfate, cobalt sulfate, and manganese sulfate were uniformly mixed according to the molar ratio of Ni:Co:Mn=0.21:0.12:0.67, dissolved in deionized water to obtain a mixed solution with a total concentration of metal elements of 2mol / L, and the concentration was weighed as Slowly add 0.2mol / L sodium carbonate solution into the mixed solution, stirring while adding, control the reaction pH value = 11, the reaction temperature is 60°C, and the reaction time is 40h. After the reaction is completed, the slurry is suction filtered 1. After washing, dry at 120°C for 24 hours, and then sinter at 500°C for 5 hours in an air atmosphere to obtain a nickel-cobalt-m...

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Abstract

The invention provides a lithium ion battery positive electrode material and a preparation method thereof. The lithium ion battery positive electrode material comprises a layered positive electrode material matrix and a filling layer, the layered positive electrode material matrix comprises main body plate layers and a lithium layer, the filling layer comprises a first element or a second element,and the content of the first element or the second element in the filling layer is higher than the content of the first element or the second element in the layered positive electrode material matrix; and the first element or the second element in the filling layer is arranged in a gap between the main body plate layers, or ions formed by the first element in the filling layer replace cations ofthe layered positive electrode material matrix, or ions formed by the second element in the filling layer replace anions of the layered positive electrode material matrix. In the charging and discharging process, the volume of the filling layer in the positive electrode material of a lithium ion battery does not change along with the volume of the layered positive electrode material matrix, so that the positive electrode material structure of the lithium ion battery is stabilized.

Description

technical field [0001] The present application relates to the field of materials, in particular to a cathode material for a lithium ion battery, a method for preparing the cathode material for a lithium ion battery, and a lithium ion battery. Background technique [0002] At present, lithium-ion batteries have been widely used in various electronic devices (such as personal mobile terminals, personal computers, wearable devices, and vehicle-mounted terminals). With the continuous improvement of people's performance requirements for electronic devices, the endurance and The service life has also put forward higher requirements. Improving the energy density of lithium-ion batteries is one of the most important ways to improve the endurance and service life of lithium-ion batteries. However, while improving the energy density of lithium-ion batteries, the problem is the attenuation of cycle life. That is, during the charging process, when lithium ions are released from the cr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/366H01M10/0525H01M2004/028Y02E60/10C01G53/50C01G51/42C01P2002/01C01P2002/80C01P2002/72C01P2002/90C01P2004/04C01P2006/40H01M4/131H01M4/1391H01M4/36H01M4/62H01M10/052H01M4/0471H01M4/5825H01M4/13H01M2220/30H01M2220/20H01M4/525H01M4/485H01M4/505H01M2004/021C01P2002/85
Inventor 雷雨雷丹李阳兴张见曾雷英夏圣安高云雷徐凡
Owner HUAWEI TECH CO LTD
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