High-capacity composite anode material, preparation method, and lithium ion battery containing high-capacity composite anode material

A negative electrode material and negative electrode technology, applied in the field of new energy materials, can solve the problems of low expansion, poor utilization and high capacity of silicon-based materials, high first effect, etc., to achieve small volume expansion, improved contact and conductivity , reduce the effect of side effects

Active Publication Date: 2018-06-29
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0022] Although the above research can improve the capacity and cycle performance of the composite negative electrode material to a certain extent, the scheme cannot make good use of and guarantee the high capacity, low expansion and high first efficiency of silicon-based materials.

Method used

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  • High-capacity composite anode material, preparation method, and lithium ion battery containing high-capacity composite anode material

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Effect test

Embodiment 1

[0075](1) Using a gaseous organic carbon source, by chemical vapor deposition, mixing with nano-silicon (median particle size 20nm) and silicon oxide (median particle size 30nm), and then ball milling at a speed of 300r / min 12h, and then mechanical fusion at a speed of 1000r / min for 30min to obtain a carbonized precursor;

[0076] (2) Under the protection of an inert gas, first raise the temperature to 100° C. for 8 hours, and then raise the temperature to 900° C. for 24 hours to obtain a composite negative electrode material.

Embodiment 2

[0078] (1) Using a liquid organic carbon source, mix the organic carbon source, nano-silicon (with a median particle size of 100nm) and silicon oxide (with a median particle size of 1000nm), and then ball mill at a speed of 2000r / min for 0.5h, Then mechanically fuse at a speed of 3000r / min for 10 minutes to obtain a carbonized precursor;

[0079] (2) Under the protection of an inert gas, first raise the temperature to 200° C. for 2 hours, and then raise the temperature to 1000° C. for 12 hours to obtain a composite negative electrode material.

Embodiment 3

[0081] (1) Using a solid organic carbon source, mix the organic carbon source, nano-silicon (with a median particle size of 200nm) and silicon oxide (with a median particle size of 150nm), then ball mill at a speed of 800r / min for 9h, and then Mechanical fusion at a speed of 600r / min for 300min to obtain a carbonized precursor;

[0082] (2) Under the protection of an inert gas, first raise the temperature to 300° C. for 1.5 hours, and then raise the temperature to 850° C. for 22 hours to obtain a composite negative electrode material.

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Abstract

The invention discloses a high-capacity composite anode material, a preparation method, and a lithium ion battery containing the high-capacity composite anode material, which belong to the technical field of new energy materials. The method comprises the following steps of (1) mixing and ball milling an organic carbon source, nanometer silicon and silicon oxide, mechanical fusing, and obtaining acarbonized precursor; (2) carrying out heat treatment on the carbonized precursor to obtain the composite anode material. According to the method provided by the invention, two high-capacity anodes are synthesized, and the high-performance composite anode material is prepared through a specific process design; the composite anode material is not only high in capacity and energy density, but also greatly improved in contact and electrical conductivity, small in interface resistance, small in volume expansion, and beneficial to reducing of side reaction, ensures the cell volume expansion to be within a reasonable range, and ensures the safety of the cell.

Description

technical field [0001] The invention belongs to the technical field of new energy materials, and relates to a composite negative electrode material, a preparation method and a lithium ion battery containing the same, in particular to a high-capacity composite negative electrode material, a preparation method and a lithium ion battery containing the same. Background technique [0002] With the rapid development of the needs of the times, the energy density of lithium-ion batteries is increasing at a rate of 7% to 10% per year. In 2016, my country released a hard index for the energy density of power batteries. According to the "Technology Roadmap for Energy Saving and New Energy Vehicles", the energy density target of power batteries for pure electric vehicles in 2020 is 350W˙h / kg. [0003] As the world's largest automobile producer and consumer market, China has been committed to promoting the new energy automobile industry. In the second half of 2015, the Ministry of Scien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/485H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/386H01M4/485H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 王健葛辉明张智建刘金成
Owner EVE ENERGY CO LTD
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