Method for preparing artificial graphite cathode material of lithium ion battery
A lithium-ion battery, artificial graphite technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve problems such as affecting the coating effect, and achieve the effects of easy implementation, high specific capacity, and stable cycle performance
Active Publication Date: 2005-11-02
NINGBO SHANSHAN NEW MATERIAL TECH
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AI Technical Summary
Problems solved by technology
The above two methods generally require a crushing step, which will affect the coating effect to a certain extent.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1～13
[0018]
[0019]
[0020] Visible by the test result of embodiment and comparative example, artificial graphite passes through this technical scheme, and tap density is by original 0.95g / cm 3 Left and right increased to 1.02g / cm 3 Above, the specific surface area is reduced from 6.1 to less than 2.0, maintaining the high capacity of artificial graphite above 335mAh / g, and reducing the irreversible capacity to less than 25mAh / g. The cycle performance is obviously improved, from being unable to cycle stably to 460 cycles and still retaining more than 90% of the initial capacity.
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Abstract
The invention discloses a making method for lithium ion battery negative materials, comprising the steps of: (1) mixing the black lead, clad material and solvent, evacuating, stripping solvent and cladding the natural black lead in the clad materials; (2) polymerizing the materials and the surface of the natural black lead will get the microencapsulation cladding layer; (3) charring or charring the products of step (2) to get the carbon negative materials with the artificial black lead layer coated on the surface, this is the lithium ion battery negative materials. The detecting results of the battery negative materials are: tap density is more than 1.02, specific surface area is lese than 2.0, the first discharging capacity is more than 350mAh / g (non-reversible capacity is less than 25mAh / g), the first charging efficiency is more than 93%, after circulating 460 times, the rest first capacity is more than 90%.
Description
technical field [0001] The invention relates to a method for preparing a battery negative electrode material, in particular to a method for manufacturing a lithium ion battery negative electrode material. background of the invention [0002] Lithium-ion battery anode materials are mainly carbon materials, mainly artificial graphite and natural graphite. Artificial graphite has mesophase carbon microspheres such as CMS and MCMB, as well as mesophase carbon fiber MCF and artificial graphite powder. The first two artificial graphites are widely used negative electrode materials, which have the advantages of good particle shape, low irreversible capacity loss, and stable cycle life, but they also have the disadvantages of high production cost and low discharge capacity. Generally around 320mAh / g. Irregular shape artificial graphite powder is not suitable for direct use as negative electrode material due to the disadvantages of low tap density and high specific surface area. T...
Claims
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IPC IPC(8): C01B31/02C01B31/04H01M4/04H01M4/36H01M4/587H01M10/05H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 胡海平王剑桥马军旗李鹏冯苏宁方坚
Owner NINGBO SHANSHAN NEW MATERIAL TECH
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