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Composite binder and application thereof in silicon negative electrode of lithium ion battery

A lithium-ion battery and binder technology, which is applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of low charge-discharge specific capacity, unstable structure, and low bonding strength, and achieve an increase in charge-discharge ratio Capacity, easy operation, and the effect of suppressing volume expansion

Pending Publication Date: 2020-08-11
QINGDAO UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0006] The invention provides a composite binder and its application in silicon negative electrodes of lithium-ion batteries, aiming to solve the problem of low charge-discharge specific capacity and low specific charge-discharge capacity caused by the low bonding strength of binders for negative electrodes of lithium-ion batteries in the prior art. The problem of unstable structure and short service life

Method used

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  • Composite binder and application thereof in silicon negative electrode of lithium ion battery
  • Composite binder and application thereof in silicon negative electrode of lithium ion battery
  • Composite binder and application thereof in silicon negative electrode of lithium ion battery

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preparation example Construction

[0030] A preparation method of a composite binder for negative poles of lithium ion batteries of the present invention comprises the following steps: taking polymer A and polymer B, mixing and stirring evenly to obtain a composite binder.

[0031] A lithium-ion battery negative electrode sheet of the present invention comprises a negative electrode current collector and an active coating coated on the surface of the negative electrode current collector, and the active coating includes the following components by weight: silicon-based active material 60-80 10-20 parts of conductive agent; 10-20 parts of composite binder for lithium ion battery negative electrode according to any one of the above.

[0032] Preferably, the thickness of the active coating is 50-1500 μm; preferably, the loading of silicon-based active material on the negative electrode sheet is 0.3-2.0 mg / cm 2 .

[0033] Further, the silicon-based active material is a silicon material or a silicon-carbon composite...

Embodiment 1

[0042] A kind of preparation method of lithium ion battery negative plate of the present invention comprises the following steps:

[0043] 1) Get polycarboxylated nitrile rubber and guar gum, mix polycarboxylated nitrile rubber and guar gum according to the weight ratio of 4:6, stir evenly, and obtain a composite binder;

[0044] 2) Get nano-silica powder, conductive agent carbon black (Super P) and the composite binder obtained in step 1), and disperse in water, wherein, nano-silica powder, conductive agent carbon black (Super-P) and step 1) obtained The weight ratio of the composite binder is 6:2:2, grinds evenly in mortar, obtains slurry;

[0045] 3) Coat the slurry obtained in step 2) on the surface of the copper foil, and dry it in vacuum at a vacuum degree of 0.13 MPa, a drying temperature of 80°C, and a drying time of 12 hours, and then cut into circular electrodes with a diameter of 12 mm sheet, the negative electrode sheet is obtained, and the active material on the ...

Embodiment 2

[0063] A kind of preparation method of lithium ion battery negative plate of the present invention comprises the following steps:

[0064] 1) Get polycarboxylated nitrile rubber and guar gum, mix polycarboxylated nitrile rubber and guar gum according to the weight ratio of 5:5, stir evenly, and obtain a composite binder;

[0065] 2) Take 60 parts of porous silicon powder, 10 parts of conductive agent acetylene black, and 10 parts of the composite binder obtained in step 1), disperse them in 1000 parts of water, and grind them evenly in a mortar to obtain a slurry;

[0066] 3) Coat the slurry obtained in step 2) on the surface of the copper foil, and vacuum-dry it at a vacuum degree of 0.1MPa, a drying temperature of 120°C, and a drying time of 10 hours, and then cut it into circular electrodes with a diameter of 12mm sheet, to obtain the negative electrode sheet, the active material on the negative electrode sheet - the loading capacity of porous silicon powder is 0.80mg / cm 2...

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Abstract

The invention discloses a composite binder and application thereof in a silicon negative electrode of a lithium ion battery. The composite binder is composed of a polymer A and a polymer B. The polymer A is polycarboxy nitrile rubber, and the polymer B is guar gum. The weight percentage of the polymer A in the composite binder is 30-70%, and the weight percentage of the polymer B in the compositebinder is 30-70%; the invention also provides a preparation method of the composite binder and an application of the composite binder in a silicon negative electrode of a lithium ion battery. When thecomposite binder is used in a silicon negative electrode of a lithium ion battery, the polycarboxy nitrile rubber and the guar gum form a hydrogen bond cross-linked three-dimensional network throughin-situ thermal polymerization, so that the bonding strength of the binder is improved, the binder has high elasticity, high viscosity and good mechanical properties, the volume expansion of the silicon negative electrode is inhibited, and the cycling stability of the silicon negative electrode is remarkably improved; the obtained lithium ion battery is high in charge-discharge specific capacity,high in coulombic efficiency and long in service life.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a composite binder and its application in silicon negative electrodes of lithium ion batteries. Background technique [0002] At present, energy problems and environmental pollution problems are becoming more and more prominent, and people urgently need to develop a kind of electrochemical storage device with green environmental protection and high energy density. Since the successful commercialization of lithium-ion batteries in the 1990s, they have been widely used in portable electronic products such as laptops, cameras, and smartphones. At present, they are actively expanding to the fields of electric vehicles and wearable smart devices. [0003] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, electrolytes, and separators. At present, graphite is a commonly used negative electrode material in lithium-ion batteries. However...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCH01M4/622H01M4/628H01M4/134H01M4/1395H01M10/0525H01M2004/027Y02E60/10
Inventor 王辉刘杰赵而英黎艳艳张倩
Owner QINGDAO UNIV OF SCI & TECH
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