Negative pole piece of lithium-ion battery and preparation method of negative pole piece and lithium-ion battery

A lithium-ion battery, negative electrode plate technology, applied in battery electrodes, electrode carriers/current collectors, secondary batteries, etc., can solve problems such as poor structural stability, shedding, etc., to reduce polarization, slow down expansion rate, improve Effect of contact area

Active Publication Date: 2016-08-31
深圳博磊达新能源科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a lithium-ion battery negative electrode sheet, thereby solving the problem in the prior art that the active material layer containing silicon-carbon negative electrode material has poor structural stability and is easy to fall off from the current collector

Method used

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  • Negative pole piece of lithium-ion battery and preparation method of negative pole piece and lithium-ion battery
  • Negative pole piece of lithium-ion battery and preparation method of negative pole piece and lithium-ion battery

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Embodiment 1

[0035] The lithium-ion battery negative electrode sheet of the present embodiment includes a current collector, and the surface of the current collector is sequentially provided with a nano-inorganic material layer and an active material layer along the direction away from the current collector; the nano-inorganic material layer is composed of the following components in mass percentage Composition: 70% of nano-calcium carbonate, 15% of graphene, 15% of binder; the particle size of nano-calcium carbonate is 80nm, and the thickness of nano-inorganic material layer is 1-3μm;

[0036] The active material layer is composed of a silicon-carbon negative electrode material, hollow carbon spheres and a binder, wherein the mass ratio of the silicon-carbon negative electrode material, hollow carbon spheres, and binder is 100:15:20, and the particle size of the silicon-carbon negative electrode material is The diameter of the hollow carbon sphere is 15-20 μm, the particle size of the holl...

Embodiment 2

[0043] The negative pole piece of the lithium ion battery in this embodiment includes a current collector, and the surface of the current collector is sequentially provided with a nano-inorganic material layer and an active material layer along the direction away from the current collector; the nano-inorganic material layer is composed of the following components by mass percentage Composition: nano calcium carbonate 80%, graphene 10%, binder 10%; the particle size of nano calcium carbonate is 50nm, and the thickness of nano inorganic material layer is 1~3μm;

[0044] The active material layer is composed of a silicon carbon negative electrode material, hollow carbon spheres and a binder, wherein the mass ratio of the silicon carbon negative electrode material, the hollow carbon spheres, and the binder is 100:10:20, and the particle size of the silicon carbon negative electrode material is 100:10:20. The diameter is 15-20 μm, the particle size of the hollow carbon sphere is 1-2...

Embodiment 3

[0051] The negative pole piece of the lithium ion battery in this embodiment includes a current collector, and the surface of the current collector is sequentially provided with a nano-inorganic material layer and an active material layer along the direction away from the current collector; the nano-inorganic material layer is composed of the following components by mass percentage Composition: nano calcium carbonate 60%, graphene 20%, binder 20%; the particle size of nano calcium carbonate is 100nm, and the thickness of nano inorganic material layer is 1~3μm;

[0052] The active material layer is composed of a silicon carbon negative electrode material, hollow carbon spheres and a binder, wherein the mass ratio of the silicon carbon negative electrode material, the hollow carbon spheres, and the binder is 100:20:20, and the particle size of the silicon carbon negative electrode material is 100:20:20. The diameter is 15-20 μm, the particle size of the hollow carbon sphere is 1-...

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Abstract

The invention discloses a negative pole piece of a lithium-ion battery and a preparation method of the negative pole piece and the lithium-ion battery. The negative pole piece comprises a current collector, wherein the surface of the current collector is sequentially provided with a nano inorganic material layer and an active substance layer along the direction far away from the current collector; the nano inorganic material layer comprises the following components: nano calcium carbonate or calcium bicarbonate and graphene at the mass ratio of (60-80) to (10-20); the active substance layer comprises a silicon-carbon negative electrode material and hollow carbon spheres; and the mass ratio of the silicon-carbon negative electrode material to the hollow carbon spheres is 100: (10-20). By the negative pole piece of the lithium-ion battery, the expansion rate of the pole piece when the lithium-ion battery is full can be effectively reduced; meanwhile, the compaction density and the liquid absorption and retention capabilities of the negative pole piece are improved; and the cycle performance of the lithium-ion battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery negative pole piece and a preparation method thereof, and a lithium ion battery. Background technique [0002] Lithium-ion batteries are favored by the market for their high energy density, good cycle life, environmental friendliness and low price. Lithium-ion battery negative pole piece is a key part of the lithium-ion battery, which has an important impact on the cycle life, rate performance and safety performance of the lithium-ion battery. [0003] At present, the negative pole pieces of lithium-ion batteries are mainly made by coating artificial graphite and natural graphite on the surface of copper foil current collector, and then slicing and rolling. Graphite anode materials have been widely used in the production of lithium-ion batteries due to their high cycle efficiency and good cycle performance. The degree of compaction and volu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/66H01M4/583H01M4/38H01M4/139H01M10/0525
CPCH01M4/139H01M4/362H01M4/386H01M4/583H01M4/66H01M4/665H01M4/667H01M10/0525Y02E60/10
Inventor 王燕李志原东甲毛国华王磊
Owner 深圳博磊达新能源科技有限公司
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