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Molybdenum trioxide-clad lithium ion battery cathode material and preparation method thereof

A molybdenum trioxide and cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems affecting the uniformity of materials, the discharge voltage platform of gram capacity, etc., and achieve good cycle stability, capacity retention rate, thickness The effect of uniformity and avoidance of disintegration

Active Publication Date: 2018-05-29
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many literatures and patent reports about coating modification at home and abroad, but there are still some problems in the way of coating and the choice of coating materials, which affect the uniformity of the material, the gram capacity and the discharge voltage platform, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) 20g lithium nickelate particles are placed at the end of the tube furnace, near the gas outlet;

[0030] (2) Place a certain amount of molybdenum trioxide in the constant temperature zone of the tube furnace, heat-treat at 1200°C under a nitrogen atmosphere, and keep it warm for 4 hours;

[0031] (3) Control the gas flow and the position of the lithium nickelate particles to coat the surface with molybdenum trioxide to obtain the final product, wherein the mass ratio of molybdenum trioxide to the inner core of the lithium nickelate particles is 0.2:1.

[0032] The obtained composite material was used as the positive electrode material of the lithium ion battery for electrochemical performance testing, and the ratio of the pole piece was composite material: acetylene black: PVDF=90:5:5. A CR2025 button cell was prepared with a lithium sheet as a reference electrode. In the voltage window of 2.5-4.2V, under the current density of 0.1C, the specific discharge capacity...

Embodiment 2

[0034] (1) Place 3g of lithium iron phosphate particles at the end of the tube furnace, near the gas outlet;

[0035] (2) Place a certain amount of molybdenum trioxide in the constant temperature zone of the tube furnace, heat-treat at 800°C in an argon atmosphere, and keep it warm for 48h;

[0036] (3) Control the air flow and the position of the lithium iron phosphate particles to coat the surface with molybdenum trioxide to obtain the final product, wherein the mass ratio of molybdenum trioxide to the inner core of the lithium iron phosphate particles is 0.0001:1.

[0037] The obtained composite material was used as the positive electrode material of the lithium ion battery for electrochemical performance testing, and the ratio of the pole piece was composite material: acetylene black: PVDF=90:5:5. A CR2025 button cell was prepared with a lithium sheet as a reference electrode. In the voltage window of 2.5-3.9V, under the current density of 0.1C, the specific discharge cap...

Embodiment 3

[0039] (1) Place 0.5g nickel-cobalt-lithium-aluminate particles at the end of the tube furnace, near the gas outlet;

[0040] (2) A certain amount of molybdenum trioxide is placed in the constant temperature zone of the tube furnace, heat-treated at 600°C in a helium atmosphere, and kept for 0.5h, wherein the mass ratio of molybdenum trioxide to the core of nickel-cobalt-lithium aluminate particles is 0.5: 1;

[0041] (3) Control the gas flow and the position of the nickel-cobalt-lithium-aluminate particles to coat the surface with molybdenum trioxide to obtain the final product.

[0042]The obtained composite material was used as the positive electrode material of the lithium ion battery for electrochemical performance testing, and the ratio of the pole piece was composite material: acetylene black: PVDF=90:5:5. A CR2025 button cell was prepared with a lithium sheet as a reference electrode. In the voltage window of 2.5-4.2V, under the current density of 0.1C, the specific ...

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Abstract

The invention relates to a molybdenum trioxide-clad lithium ion battery cathode material and a preparation method thereof. The lithium ion battery cathode material disclosed by the invention consistsof two parts, i.e., a composite oxide core and a cladding layer. The core is a simple or doping-modified ternary material (such as lithium cobalt oxide, lithium nickel cobalt manganese oxide or lithium nickel cobalt aluminium oxide), lithium manganese oxide, lithium iron phosphate or the like, and the cladding layer is molybdenum trioxide. The preparation method of the composite lithium ion battery cathode material disclosed by the invention is simple, the process is controllable, and industrial production is facilitated.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery cathode materials, in particular to a molybdenum trioxide-coated lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] With the vigorous development of new energy vehicles, the lithium-ion battery industry has entered a stage of rapid development. The key materials that affect the performance of lithium-ion batteries mainly include positive electrode materials, negative electrode materials, and electrolytes. Among them, the positive electrode material is currently the main factor limiting battery performance, and it is also the main factor accounting for the high cost of lithium-ion batteries, which is close to 40%. [0003] At present, the positive electrode materials mainly include lithium cobalt oxide, lithium nickel cobalt manganate or lithium nickel cobalt aluminate ternary materials, lithium manganate, lithium iron phosphate, etc., ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M4/628H01M10/0525Y02E60/10
Inventor 谭强强夏青
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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