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Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery

A lithium-ion battery and negative electrode material technology, applied in the field of electrochemistry, can solve the problems of poor electrode cycle performance, poor rate performance, easy cracking, pulverization, etc., to improve cycle stability, improve electrical conductivity, and prevent agglomeration Effect

Active Publication Date: 2013-10-09
宁波富理电池材料科技有限公司
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  • Description
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Problems solved by technology

The silicon-carbon composite material obtained by this method has a certain improvement on the shortcomings of the poor cycle performance of the existing silicon-carbon anode materials, but the structure of the amorphous carbon layer in the outer layer is relatively dense. During the charging and discharging process, due to the huge volume of silicon change, easy to crack and pulverize, leading to poor electrode cycle performance, 0.5C charge and discharge, and capacity retention rate after 50 cycles are only 63%, and the rate performance is poor, which needs to be further improved

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  • Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof as well as lithium ion battery

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preparation example Construction

[0034] The present invention also provides a preparation method for the above lithium ion battery negative electrode material, comprising the following steps: a) mixing and ball milling silicon powder and carbon material to obtain a first mixture; b) mixing the first mixture, the first carbon coating material mixing with a foaming agent and ball milling to obtain a second mixture; c) mixing the second mixture with a second carbon coating material, ball milling, and then roasting under the protection of an inert gas to obtain a negative electrode material for a lithium ion battery.

[0035] Wherein, the silicon powder and the carbon material are mixed and ball-milled to obtain the first mixture, which is the core silicon-carbon particle of the negative electrode material of the lithium ion battery. The silicon powder can be silicon powder well known to those skilled in the art, and there is no special limitation. In order to make the silicon particles can be nano-dispersed among...

Embodiment 1

[0046] 1.1 Put 2g of nano-silica powder and 2g of mesocarbon microspheres in a ball milling jar, use absolute ethanol as the ball milling medium, and ball mill at 400 rmp for 8 hours to obtain the first mixture.

[0047] 1.2 Add 4 g of glucose and 0.004 g of urea to the first mixture obtained in 1.1, ball mill at 450 rpm for 4 h, and spray dry to obtain the second mixture.

[0048] 1.3 Add 40 g of glucose to the second mixture obtained in 1.2, ball mill at 450 rpm for 4 hours, then dry the resulting mixture in an oven at 80 °C, and then bake it in a tube furnace in an argon atmosphere at 800 °C for 5 hours to obtain a lithium-ion battery negative electrode material .

[0049] The lithium ion battery negative electrode material, Supper P and polyvinylidene fluoride binder obtained in 1.3 were prepared into a slurry in a ratio of 80:10:10, and then uniformly coated on the copper foil current collector to obtain a negative electrode pole piece , using lithium metal as the counte...

Embodiment 2

[0051] 2.1 Put 2g of nano-silica powder and 2g of mesocarbon microspheres in a ball milling jar, use absolute ethanol as the ball milling medium, and ball mill at 400 rmp for 8 hours to obtain the first mixture.

[0052] 2.2 Add 0.8 g of glucose and 0.004 g of urea to the first mixture obtained in 2.1, ball mill at 450 rpm for 4 hours, and spray dry to obtain a second mixture.

[0053] 2.3 Add 4.8 g of glucose to the second mixture obtained in 2.2, ball mill at 450 rpm for 4 hours, and then dry the resulting mixture in an oven at 80 °C, and then bake it in a tube furnace in an argon atmosphere at 800 °C for 5 hours to obtain a lithium-ion battery negative electrode Material.

[0054] The lithium-ion battery negative electrode material, Supper P and polyvinylidene fluoride binder obtained in 2.3 were prepared into a slurry in a ratio of 80:10:10, and then uniformly coated on the copper foil current collector to obtain a negative electrode pole piece , using lithium metal as th...

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Abstract

The invention provides a lithium ion battery cathode material and a preparation method of the lithium ion battery cathode material as well as a lithium ion battery. The lithium ion battery cathode material comprises an inner core, a middle layer outside the inner core and an outer shell wrapping the middle layer, the inner core is Si-C particles, the middle layer is a foam layer, the outer shell is an amorphous carbon layer and the Si-C particles are formed by Si particles and C materials. Compared with the prior art, a middle carbon foam layer existing between the Si-C particle inner core and the amorphous carbon outer shell can form an conductive network structure, thus improving conductivity of a material and buffering enormous volume change of Si particles in the charge-discharge processes; and the amorphous carbon outer shell layer can maintain the core-shell structure of the cathode material, and the cladding layer of the core-shell structure can buffer the volume change, improve cycling stability of electrodes, reduce contact between active substances and an electrolyte, improve first coulombic efficiency of an electrode, prevent nanoparticle aggregation and enhance electrode conductivity.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a negative electrode material of a lithium ion battery, a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high operating voltage, high specific energy, wide operating temperature range, stable discharge, small size, light weight, no memory effect, and environmental friendliness. Therefore, they are widely used in portable electronic devices, electric vehicles, space technology, and defense industries. and other fields have shown broad application prospects. Moreover, with the increasing demand for high-capacity and long-life batteries in mobile electronic devices, people have put forward higher requirements for the performance of lithium-ion batteries, and negative electrode materials are important factors for improving the energy and cycle life of lithium-ion batteries. has be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/134H01M4/1393H01M4/1395H01M10/0525
CPCY02E60/10
Inventor 裴晓英李志虎夏永高刘兆平
Owner 宁波富理电池材料科技有限公司
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