Composite, preparation method and application thereof in lithium ion secondary battery

A composite and lithium compound technology, applied in the field of Si-O-C-Li composites, can solve problems such as not being able to be used in batches, difficult to process, etc., achieve structural stability, reduce silicon expansion problems, and avoid agglomeration problems

Active Publication Date: 2017-06-09
BTR NEW MATERIAL GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the generated lithium silicate phase has not undergone secondary treatment, showing strong alkalinity, difficult to process in the later stage, and cannot be used in batches

Method used

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  • Composite, preparation method and application thereof in lithium ion secondary battery
  • Composite, preparation method and application thereof in lithium ion secondary battery
  • Composite, preparation method and application thereof in lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] SiO with a carbon coating on the surface x (x=0.95) 50g, lithium source LiNH 2 12.5g was dispersed at a high speed until uniformly mixed; then placed in an argon atmosphere for heat treatment at 500°C for 2 hours, cooled naturally to room temperature to take out the composite, and then removed impurities by impregnation and dried to obtain a surface-treated composite.

[0082] image 3 It is the SEM picture of the compound obtained in this embodiment. It can be seen from the figure that the dark area formed by the nano-silicon inlaid lithium-containing compound is uniformly distributed in the particles, forming an island with the nano-silicon inlaid lithium-containing compound as an island. Island structure for the sea.

Embodiment 2

[0084] SiO with a carbon coating on the surface x (x=0.95) 500g, lithium source Li 2 CO 3 125g was dispersed at a high speed until uniformly mixed; then placed in an argon atmosphere for heat treatment at 500°C for 2 hours, cooled naturally to room temperature to take out the composite, and then removed impurities by impregnation and dried to obtain a surface-treated composite.

Embodiment 3

[0086] Take SiO with a carbon coating on the surface x (x=0.95) 50g, lithium source metal lithium powder 10.8g were mixed under vacuum for 3h; then placed in an argon atmosphere for heat treatment at 500°C for 2h, cooled naturally to room temperature to take out the composite, and then removed impurities by impregnation and dried , to obtain a surface-treated composite.

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Abstract

The invention discloses a composite. The composite comprises nanometer silicon, a lithium-containing compound and a carbon coating, or comprises nanometer silicon, a silicon oxide, a lithium-containing compound and a carbon coating. The method comprises the following steps: (1) mixing a carbon-coated silicon oxide and a lithium-source solid phase; and (2) thermally processing a prefabricated lithium precursor obtained in step (1) in a vacuum or non-oxidative atmosphere to obtain the composite. The method is simple, small in requirement on equipment, and low in cost; the obtained composite is stable in structure; the structure and property cannot be degraded after long-term storage; a battery prepared from a negative electrode material containing the composite is high in lithium taking-off capacity, high in first coulomb efficiency, and high in circulating performance; the charging capacity is equal to or above 1920mAh / g; the discharging capacity is equal to or above 1768mAh / g; and the first effect is equal to or more than 90.2%.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for lithium ion batteries, and relates to a composite, its preparation method and application, in particular to a Si-O-C-Li composite, its preparation method and its application in lithium ion secondary batteries. Background technique [0002] Lithium-ion secondary batteries are widely used in portable electronic products, electric vehicles and energy storage. However, at the first charge, the electrolyte is unstable to form an SEI film on the electrode surface, which consumes a large amount of lithium, resulting in low initial Coulombic efficiency. In the first cycle of graphite, 5-20% of the lithium is used to form the SEI film, while Si, Sn, and SiOx need to consume 20-50% of the lithium. In this regard, researchers have made a series of optimized designs, such as preparing nanowires, porous nanostructures and carbon coatings. Although the cycle performance is improved, the contact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/38H01M4/48H01M4/58H01M4/587H01M10/0525B82Y30/00
CPCH01M4/366H01M4/386H01M4/483H01M4/5825H01M4/587H01M10/0525B82Y30/00H01M4/364H01M2004/027H01M4/625H01M4/1391H01M4/1397H01M4/0471Y02E60/10H01M4/62H01M10/052C01B32/05C01B32/158C01B32/182C01B33/021C01B33/113B82Y40/00C01P2004/80C01P2006/40C01B33/025C01B33/12C01P2004/03C01P2006/12H01M4/131H01M4/485
Inventor 庞春雷屈丽娟任建国岳敏
Owner BTR NEW MATERIAL GRP CO LTD
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