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Method for improving reversible specific capacity of lithium ion battery anode material

A lithium-ion battery and cathode material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as the reversible ratio theoretical capacity gap, and achieve the effect of obvious and reliable performance improvement, simple process and low cost

Inactive Publication Date: 2015-05-20
WUHAN HONGYANG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Except for lithium iron phosphate, the actual reversible specific capacity of other positive electrode materials has a large gap with their reversible specific theoretical capacity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1. Take 10 g of the lithium cobalt oxide lithium ion battery positive electrode material obtained according to the above-mentioned prior art, spread it in a porcelain boat of 60mm×120mm, and place the porcelain boat in an atmospheric pressure furnace.

[0017] 2. In the atmospheric pressure furnace, raise the temperature to 100°C at a heating rate of 5°C / min, and at the same time fill in argon (atmospheric pressure) for half an hour to drive out all the oxygen in the atmospheric pressure furnace. Then replace the argon with hydrogen or other reducing gas (normal pressure), reduce for 30 minutes, and lower the temperature with the furnace.

[0018] 3. Test the button batteries made of the positive electrode material of the lithium cobaltate lithium ion battery and the same batch of products without gas reduction, and the reversible specific capacity of the lithium cobaltate produced in this embodiment is increased by 10-15mAh / g.

Embodiment 2

[0020] 1. Take 10 g of the lithium cobalt oxide lithium ion battery positive electrode material obtained according to the above-mentioned prior art, spread it in a porcelain boat of 60mm×120mm, and place the porcelain boat in an atmospheric pressure furnace.

[0021] 2. In the atmospheric pressure furnace, raise the temperature to 150°C at a heating rate of 5°C / min, and at the same time fill in argon (atmospheric pressure) for half an hour to drive out all the oxygen in the atmospheric pressure furnace. Then replace the argon with hydrogen or other reducing gas (normal pressure), reduce for 100 minutes, and lower the temperature with the furnace.

[0022] 3. The lithium cobaltate lithium ion battery cathode material obtained and the button batteries made of the same batch of products without gas reduction were tested respectively. The reversible specific capacity of the lithium cobaltate obtained in this embodiment was increased by 15-20mAh / g.

Embodiment 3

[0024] 1. Take 50g of the lithium cobaltate lithium ion battery positive electrode material obtained according to the above-mentioned prior art, spread it in a porcelain boat of 60mm×120mm, and place the porcelain boat in an atmospheric pressure furnace.

[0025] 2. In the atmospheric pressure furnace, raise the temperature to 300°C at a heating rate of 5°C / min, and at the same time fill in argon (atmospheric pressure) for half an hour to drive out all the oxygen in the atmospheric pressure furnace. Then replace the argon with hydrogen or other reducing gas (normal pressure), reduce for 180 minutes, and lower the temperature with the furnace.

[0026] 3. The lithium cobaltate lithium ion battery cathode material obtained and the button batteries made of the same batch of products without gas reduction were tested respectively. The reversible specific capacity of the lithium cobaltate obtained in this embodiment was increased by 15-20mAh / g.

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Abstract

The invention discloses a method for improving the reversible specific capacity of a lithium ion battery anode material. The lithium ion battery anode material is a lithium cobalt oxide, cobalt nickel lithium manganate or lithium manganate lithium ion battery anode material which is obtained through an ordinary lithium roasting process. The method comprises the following steps of: putting the lithium cobalt oxides, cobalt nickel lithium manganate or lithium manganate lithium ion battery anode material into a normal pressure atmosphere furnace, increasing the temperature in the normal pressure atmosphere furnace to be at 100-300 DEG C, chagrining an insert gas so as to repel the oxygen in the atmosphere furnace, subsequently charging a reduction gas and lasting for 30-180 minutes. By carrying out reduction treatment on the lithium cobalt oxides, cobalt nickel lithium manganate or lithium manganate lithium ion battery anode material which is obtained through an ordinary lithium roasting process, the reversible specific capacity of the anode material is improved. The method is simple in process, low in cost, remarkable and reliable in property improvement and worthy of popularization and application.

Description

technical field [0001] The invention relates to a method for improving the reversible specific capacity of lithium cobalt oxide, ternary material (lithium cobalt nickel manganese oxide) and lithium manganate (including modified lithium manganate) lithium ion battery cathode materials produced by the existing method. Background technique [0002] In the composition of lithium-ion batteries, the cathode material is the key to determine the performance of lithium-ion batteries. In the current commercialized lithium-ion batteries, the positive electrode materials are mainly lithium cobalt oxide, ternary materials (cobalt nickel manganese oxide lithium), lithium manganese oxide (including modified lithium manganese oxide) and lithium iron phosphate. Except for lithium iron phosphate, the actual reversible specific capacity of other positive electrode materials has a large gap with their reversible specific theoretical capacity. Contents of the invention [0003] The technical ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/10
Inventor 贾志杰
Owner WUHAN HONGYANG TECH DEV