Lithium ion battery, modified lithium ion battery anode material and preparation method of anode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, electrode manufacturing, positive electrodes, etc., can solve problems such as unfavorable lithium ion and electron rapid transmission, unfavorable ternary material structure stability, and material rate performance decline, etc., to achieve Good industrial application prospects, improved cycle stability, and good electrical conductivity

Inactive Publication Date: 2018-03-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used coating materials are metal oxides such as: Al2O3, MgO, SiO2, TiO2, etc., but these metal oxidation conductivity is low, which is not conducive to the rapid transmission of lithium ions and electrons, thus reducing the rate performance of the material; On the one hand, some are coated with carbon with better conductivity. The conditions of carbonization under high-temperature inert gas required for the coating are not conducive to the structural stability of the ternary material. During the synthesis process, the deoxidation of the lattice leads to the destruction of the structure.

Method used

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  • Lithium ion battery, modified lithium ion battery anode material and preparation method of anode material
  • Lithium ion battery, modified lithium ion battery anode material and preparation method of anode material
  • Lithium ion battery, modified lithium ion battery anode material and preparation method of anode material

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preparation example Construction

[0025] The preparation method of described modified lithium-ion battery cathode material mainly comprises the following steps:

[0026] Step 1, the ternary precursor Ni x co y Mn1 -x-y (OH) 2 (0≤x≤1, 0≤y≤1) and lithium salt are mixed according to a predetermined ratio and then ball-milled, followed by calcination in air or oxygen atmosphere at a temperature of 700°C to 900°C to obtain the ternary cathode material LiNi x co y mn 1-x-y o 2 (0≤x≤1, 0≤y≤1).

[0027] Specifically, the predetermined ratio is nNi:nLi=1:(1-1.2); the ternary precursor and lithium salt are mixed according to a predetermined ratio and then added to a ball mill, and a ball milling medium is added to the ball mill, and ball milled for 1 hour A homogeneous mixture is obtained after ~4 hours, and the obtained mixture is calcined in air or oxygen atmosphere at a temperature of 700° C. to 900° C. for 5 to 12 hours to obtain the ternary positive electrode material. The lithium salt is one or more of lit...

Embodiment 1

[0033] The preparation method of the modified lithium-ion battery cathode material provided by the first embodiment of the present invention mainly includes the following steps:

[0034] 1.1 Add 10g Ni 0.6 co 0.2 mn 0.2 (OH) 2 and 4.3g Li 2 CO 3 After mixing, put it into an agate ball mill jar with a volume of 80ml, the ball-to-material ratio is 2:1, and run at a speed of 300r / min for 1 hour; Raise the temperature to 450°C, and then raise the temperature to 850°C at 2°C / min for 12 hours to obtain a ternary material.

[0035] 1.2 Mix 1g of the obtained ternary material and 0.05g of melamine manually in an agate mortar for half an hour, then transfer to an agate ball mill jar with a volume of 80ml, the ratio of ball to material is 2:1, and run at a speed of 300r / min for 1 hour; then put the obtained mixed powder into a muffler furnace and heat up to 650°C at 5°C / min and then keep it warm for 1 hour to obtain the modified lithium-ion battery positive electrode material.

...

Embodiment 2

[0038] The preparation method of the modified lithium-ion battery cathode material provided by the second embodiment of the present invention mainly includes the following steps:

[0039] 2.1 Add 10g Ni 0.5 co 0.2 mn 0.3 Oh) 2 and 4.3g Li 2 CO 3 After mixing, put it into an agate ball mill tank with a volume of 80ml, the ratio of ball to material is 2:1, and run at a speed of 300r / min for 1 hour; The temperature was raised to 450°C in one minute, and then raised to 850°C at a rate of 2°C / min and held for 12 hours to obtain a ternary material.

[0040] 2.2 Mix 1g of the obtained ternary material and 0.1g of chitosan manually in an agate mortar for half an hour, then transfer to an agate ball mill jar with a volume of 80ml, the ratio of ball to material is 2:1, and run at a speed of 300r / min for 1 Hours; then put the uniformly mixed powder into a muffler furnace to raise the temperature to 650°C at 5°C / min and keep it warm for 1 hour to obtain the modified lithium-ion batt...

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Abstract

The invention belongs to the related technical field of anode materials and discloses a preparation method of the modified lithium ion battery anode material. The method comprises the following steps:(1) mixing a ternary precursor NixCoyMn(1-x-y)(OH)2 with lithium salt in a preset proportion to be ball-milled, and then roasting the mixture at 850 DEG C to obtain a ternary anode material LiNixCoyMn(1-x-y)O2; and (2) mixing the obtained ternary anode material with a nitrogen-containing organic matter and calcining the mixture in a preset atmosphere to obtain the modified lithium ion battery anode material. The invention also relates to the modified lithium ion battery anode material and a lithium ion battery. According to the invention, the rate performance and the cyclic stability of the lithium ion battery are improved, and the process is simple and easy to implement.

Description

technical field [0001] The invention belongs to the technical field related to positive electrode materials, and more specifically relates to a lithium ion battery, a modified lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] As a new type of green and environment-friendly power supply, rechargeable lithium-ion batteries are widely used in portable devices such as mobile phones, cameras, computers, electric bicycles, electric vehicles, etc. in transportation. As the core component of lithium-ion batteries, cathode materials greatly affect the performance of lithium-ion batteries. [0003] At present, lithium-ion battery cathode materials that are widely used include lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, and nickel-cobalt lithium manganese oxide ternary materials. During the process of charging, discharging and shelving, the contact interface of these materials with the electrolyte ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M4/04H01M10/0525
CPCH01M4/0471H01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525H01M2004/028Y02E60/10
Inventor 李箐陈仙王谭源
Owner HUAZHONG UNIV OF SCI & TECH
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