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Lithium-ion battery negative electrode sheet and lithium-ion battery with hard carbon and soft carbon as active materials

A lithium-ion battery and active material technology, which is applied in the field of lithium-ion battery manufacturing, can solve the problems such as the lack of very systematic research and analysis of hard carbon and soft carbon, the low initial charge and discharge efficiency of the graphite system, and the processing performance that is not as good as that of the graphite system. The effect of improving high current rate performance, improving charging performance, improving cycle performance and safety

Active Publication Date: 2017-02-15
湖南宏杉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] However, hard carbon and soft carbon materials also have some defects, including: 1. The graphite system has low initial charge and discharge efficiency of the two materials; 2. The pole pieces of hard carbon and soft carbon materials have low compaction density, and the processing performance of the production process is not as good as graphite 3. The hard carbon and soft carbon system is used as the only negative electrode active material, and the peel strength of the electrode sheet is low, which may occur in the case of current collector peeling during the production process
4. The film-forming mechanism of hard carbon and soft carbon has not yet been systematically studied and analyzed

Method used

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  • Lithium-ion battery negative electrode sheet and lithium-ion battery with hard carbon and soft carbon as active materials
  • Lithium-ion battery negative electrode sheet and lithium-ion battery with hard carbon and soft carbon as active materials

Examples

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Effect test

Embodiment 1

[0024] Embodiment 1: artificial graphite, Super P (graphite), KS-6 (carbon black), sodium carboxymethyl cellulose, and SBR emulsion with a mass content of 40% are according to the weight of 91.5: 1.5: 1.0: 2.0: 4.0 Proportional mixing, as the first layer of graphite layer material, according to 40g / m on one side 2 The areal density is coated on both sides of the metal foil current collector, and dried to make a pole piece; the hard carbon material, soft carbon material, Super P (graphite), KS-6 (carbon black), carboxymethyl Sodium cellulose and SBR emulsion with a mass content of 40% are mixed to make a slurry, and the mass ratio of each component is 45.0:46.5:1.5:1.0:2.0:4.0, according to 90g / m on one side 2 The surface density of the primary pole piece is coated on both sides of the primary pole piece to make a secondary pole piece; artificial graphite, Super P (graphite), KS-6 (carbon black), sodium carboxymethyl cellulose, and 40% of the mass content SBR emulsion is mixed...

Embodiment 2

[0025] Embodiment 2: the SBR emulsion of artificial graphite, Super P (graphite), KS-6 (carbon black), sodium carboxymethyl cellulose, mass content 40% is according to the weight of 91.5:1.5:1.0:2.0:4.0 Proportional mixing, as the first layer of graphite layer material, according to 40g / m on one side 2 The areal density of the metal foil is coated on both sides of the metal foil current collector, and dried to make a pole piece; the hard carbon material, Super P (graphite) KS-6 (carbon black), sodium carboxymethyl cellulose, SBR emulsion with a mass content of 40% is mixed to make a slurry, and the mass ratio of each component is 91.5:1.5:1:2:4, according to 90g / m on one side 2 The surface density of the primary pole piece is coated on both sides of the primary pole piece to make a secondary pole piece; artificial graphite, Super P (graphite), KS-6 (carbon black), sodium carboxymethyl cellulose, and 40% of the mass content SBR emulsion is mixed according to the weight ratio o...

Embodiment 3

[0026] Embodiment 3: the SBR emulsion of artificial graphite, Super P (graphite), KS-6 (carbon black), sodium carboxymethylcellulose, mass content 40% is according to the weight of 91.5:1.5:1.0:2.0:4.0 Proportional mixing, as the first layer of graphite layer material, according to 40g / m on one side 2 The areal density of the metal foil is coated on both sides of the metal foil current collector, and dried to make a pole piece; the soft carbon material, Super P (graphite) KS-6 (carbon black), sodium carboxymethyl cellulose, SBR emulsion with a mass content of 40% is mixed to make a slurry, and the mass ratio of each component is 91.5:1.5:1:2:4, according to 90g / m on one side 2 The surface density of the primary pole piece is coated on both sides of the primary pole piece to make a secondary pole piece; artificial graphite, Super P (graphite), KS-6 (carbon black), sodium carboxymethyl cellulose, and 40% of the mass content SBR emulsion is mixed according to the weight ratio of...

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Abstract

The invention relates to a manufacture technology of a lithium ion battery, and particularly relates to a lithium ion battery negative electrode piece using hard carbon and soft carbon as active materials and a lithium ion battery with the negative electrode piece. The lithium ion battery negative electrode piece using hard carbon and soft carbon as the active materials comprises a metal foil current collector, a first graphitic layer, a main body functional layer and a second graphitic layer, wherein the surface of the metal foil current collector is coated with the first graphitic layer, the surface of the first graphitic layer is coated with the main body functional layer, and the surface of the main body functional layer is coated with the second graphitic layer. According to the lithium ion battery negative electrode piece using hard carbon and soft carbon as the active materials, the characteristics of a graphite material and hard carbon and soft carbon materials are fully utilized, and thus the heavy-current rate performance can be effectively improved; the lithium ion battery negative electrode piece using hard carbon and soft carbon as the active materials has the advantages of good cycle performance, high safety, high-rate charge and discharge resistance, and the like, and meets the requirement of charge performance of the lithium ion battery at a low temperature; meanwhile, a manufacture method is simple, and the lithium ion battery negative electrode piece can be produced by using existing lithium ion battery production equipment.

Description

technical field [0001] The invention relates to the manufacturing technology of a lithium ion battery, in particular to a lithium ion battery negative pole piece with hard carbon and soft carbon as active materials and a lithium ion battery with the negative pole piece. Background technique [0002] Due to its high energy density, high operating voltage, long cycle life and low self-discharge rate, lithium-ion batteries have attracted more and more attention, and their application range has gradually expanded. The positive and negative electrode materials of lithium-ion batteries are all lithium-ion intercalation compounds with a layered or tunnel structure in which lithium ions can be freely intercalated and deintercalated. At present, the anode materials in commercialized lithium-ion batteries are mainly graphite-like carbon materials. Graphite relatively well satisfies the requirements of high conductivity, large intercalation lithium capacity and high chemical stability...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/133H01M4/583H01M10/0525
CPCH01M4/133H01M4/366H01M4/587H01M10/0525Y02E60/10
Inventor 鲍添增秦怀鹏张世梁
Owner 湖南宏杉新能源科技有限公司
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