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Secondary battery anode material, preparation method thereof and battery containing anode material

A secondary battery and negative electrode material technology, applied in the direction of secondary batteries, battery electrodes, negative electrodes, etc., can solve the problem that it is difficult to ensure good contact between conductive carbon and active materials, conductive carbon cannot fully function, and kinetic performance deteriorates, etc. problems, to achieve the effect of easy large-scale production, easy control, and large-scale production

Inactive Publication Date: 2016-11-09
CONTEMPORARY AMPEREX TECH CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small particles of conductive carbon materials, it takes a long time for dry mixing to disperse evenly, and conductive carbon cannot fully play its role
During the use of the secondary battery, as the number of cycles prolongs, due to the failure of the binder and the occurrence of particle rearrangement, it is difficult to ensure good contact between the conductive carbon and the active material, which can cause the power of the battery after a long cycle. deterioration of academic performance
At the same time, if the kinetic performance of the negative electrode cannot meet the demand, lithium ions will be reduced to metallic lithium on the surface of the negative electrode, which will cause capacity decay and serious safety problems.

Method used

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  • Secondary battery anode material, preparation method thereof and battery containing anode material
  • Secondary battery anode material, preparation method thereof and battery containing anode material
  • Secondary battery anode material, preparation method thereof and battery containing anode material

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The present application also relates to a preparation method of the secondary battery negative electrode material, at least including the following steps:

[0048] (1) mixing the core particles with the precursor of the carbon layer to form a first modified material coated with the precursor of the carbon layer;

[0049] (2) mixing the first modified material with the conductive carbon particles or the precursor of the conductive carbon particles, and dispersing the conductive carbon particles or the precursor of the conductive carbon particles on the surface of the first modified material;

[0050] (3) Carbonizing the product obtained in step (2) to obtain a negative electrode material for a secondary battery.

[0051]This application adopts the method of mixing twice and carbonizing once. First, the precursor of the connecting carbon layer coated on the surface of the inner core particle is carbonized to form a carbon layer with a connecting effect, and then the precu...

Embodiment

[0062] A negative electrode material for a secondary battery, comprising core particles 1, a connection carbon layer 2 coated on the surface of the core particle, and conductive carbon particles 3 distributed on the surface of the connection carbon layer.

[0063] The preparation method is:

[0064] 1. Mix the core particles and the precursor connected to the carbon layer at high speed, and the mixing time is 3 to 5 hours; the mixing speed is 900 to 1500r / min; the weight ratio of the core particles: the precursor connected to the carbon layer is recorded as A; Form the first modified material coated with the precursor of the connected carbon layer; the selection of raw materials is shown in Table 1, and the mixing conditions are shown in Table 2;

[0065] 2. Stir and mix the first modified material with conductive carbon particles or the precursor of conductive carbon particles at a high speed for 0.5 to 3 hours; the speed of mixing and stirring is 300 to 600r / min; conductive ...

experiment example

[0080] Preparation of battery:

[0081] 1. Mix graphite, conductive carbon and binder at a mass ratio of 97:1:2; mix the negative electrode material and binder of Examples 1 to 14 of this application at a mass percentage of 98:2, and control the solid content at 50%. Coating on the copper foil current collector, drying in vacuum to prepare negative pole pieces 1-14;

[0082] 2. The ternary positive electrode sheet prepared by traditional mature technology, 1mol / L LiPF 6 / EC+DMC+EMC (v / v=1:1:1) electrolyte, Celgard2400 diaphragm, made into soft pack cells 1~14 by winding process.

[0083] The charging performance of the material was tested by the following methods:

[0084] Using the LAND battery test system of Wuhan Jinnuo Electronics Co., Ltd., the charging and discharging voltage is limited to 2.8-4.2V. According to the actual measured nominal capacity C0, the secondary batteries under each group number are divided into 10 groups, respectively. 1.0C, 1.2C, 1.4C, 1.5C, 1...

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Abstract

The invention relates to the field of secondary batteries, in particular to a secondary battery anode material, a preparation method thereof and a battery containing the anode material. The secondary battery anode material comprises core particles, a connection carbon layer coating the surfaces of the core particles and conductive charcoal particles distributed on the surface of the connection carbon layer. The secondary battery anode material has the advantages that a macromolecular polymer is taken as an adhesive, and a small-particle carbon material layer is uniformly coated on the surface of an existing anode active material, so that an effective and stable conductive network can be formed in a pole piece, dynamics properties of the material are greatly improved, and a battery cell has good rate capability and quick charging capability.

Description

technical field [0001] The present application relates to the field of secondary batteries, in particular, to a negative electrode material for a secondary battery, a preparation method thereof and a battery containing the negative electrode material. Background technique [0002] In the negative electrode material of the existing secondary battery, it is necessary to add conductive carbon such as SuperP and dry mix and disperse it in the process of making the electrode sheet, so as to form a conductive network in the negative electrode sheet and improve the kinetic performance of the negative electrode. However, due to the small particles of the conductive carbon material, it takes a long time for dry mixing to disperse evenly, and the conductive carbon cannot fully play its role. During the use of the secondary battery, as the number of cycles prolongs, due to the failure of the binder and the occurrence of particle rearrangement, it is difficult to ensure good contact bet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525
CPCH01M4/364H01M4/583H01M4/622H01M4/625H01M10/0525C01B33/18C01P2004/61C01B32/05H01M4/366H01M4/483H01M4/587Y02E60/10H01M4/48H01M2004/021H01M2004/027
Inventor 沈睿何立兵李纾黎马建军
Owner CONTEMPORARY AMPEREX TECH CO
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