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Battery negative plate, preparation method thereof and lithium ion battery

A lithium-ion battery and battery negative electrode technology, which is applied in the direction of electrode manufacturing, battery electrodes, electrode collector coating, etc., can solve the problems of reducing battery energy density, achieve improved power and safety, stable electrochemical performance, and internal small resistance effect

Inactive Publication Date: 2021-03-16
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the general idea of ​​improving battery power is to optimize the structure of electrode materials, increase the proportion of conductive agents in electrode materials or reduce the coating thickness of active materials. Reducing the coating thickness will reduce the energy density of the battery

Method used

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  • Battery negative plate, preparation method thereof and lithium ion battery
  • Battery negative plate, preparation method thereof and lithium ion battery
  • Battery negative plate, preparation method thereof and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This example is prepared a battery negative electrode sheet.

[0066] The first active material is a artificial graphite, and the first conductive agent is a conductive carbon black (SP) and graphene, the first binder is CMC and SBR, dissolved in water to form an adhesive solution, with a first active material, first The conductive agent, as well as the mass ratio of the first binder is 92: 5: 3 is placed in a dual planetary pulper, and the self-rotating speed of the double planetary beating machine is 45-50 rpm, the non-rotation speed of 1500-1600 rpm is made of stirring The first slurry.

[0067] Press the first slurry to 59-65 g / m 2 The surface density is coated on one surface of the copper foil, drying such that the aqueous content is less than 1000 ppm to form a first active material layer.

[0068] The second active material is hard carbon, the second conductive agent is SP, and the second adhesive is PVDF, dissolved in such as N-methylpyrrolidone forming a second b...

Embodiment 2

[0071] This example is prepared a battery negative electrode sheet.

[0072] The first active material is natural graphite, the first conductive agent is a conductive carbon black (SP) and graphene, the first binder is CMC and SBR, dissolved in water to form a binder solution, with a first active material, first The conductive agent, as well as the mass ratio of the first binder is 92: 5: 3 is placed in a dual planetary pulper, and the self-rotating speed of the double planetary beating machine is 45-50 rpm, the non-rotation speed of 1500-1600 rpm is made of stirring The first slurry.

[0073] Press the first slurry to 59-65 g / m 2 The surface density is coated on one surface of the copper foil, drying such that the aqueous content is less than 1000 ppm to form a first active material layer.

[0074] The second active substance is activated carbon, the second conductive agent is carbon fiber, and the second binder is PVDF, dissolved in such as N-methylpyrrolidone forming a second...

Embodiment 3

[0077] This example is prepared a battery negative electrode sheet.

[0078] The first active substance is Si and artificial graphite, the first conductive agent is a conductive carbon black (SP) and graphene, the first binder is CMC and SBR, dissolved in water to form a binder solution, with Si and artificial graphite, The mass ratio of the first conductive agent, and the first binder is 10: 82: 5: 3 placed in a dual planetary beating machine, and the self-rotating speed of the double planetary beater is 45-50 rpm, the non-unversion speed is 1500-1600 rpm. The first slurry is made at the speed.

[0079] Press the first slurry to 59-65 g / m 2 The surface density is coated on one surface of the copper foil, drying such that the aqueous content is less than 1000 ppm to form a first active material layer.

[0080] The second active material is a hard carbon. The second conductive agent is carbon fiber, and the second binder is PVDF, dissolved in such as N-methylpyrrolidone forming a...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and relates to a battery negative plate, a preparation method thereof and a lithium ion battery. The negative plate comprises a negative current collector, a first active substance layer positioned on the negative current collector, and a second active substance layer positioned on the first active substance layer, wherein thefirst active material layer comprises a first active material, a first conductive agent and a first binder; the second active substance layer comprises a second active substance, a second conductive agent and a second binder; the capacity of the first active substance for storing lithium ions is greater than that of the second active substance for storing lithium ions; and the ability of the second active material to deintercalate lithium ions is greater than the ability of the first active material to deintercalate lithium ions. In the large-current charging and discharging process, the battery with the battery negative plate can rapidly deintercalate and intercalate lithium ions, the risk of surface lithium precipitation is remarkably reduced, and the power and safety of the battery areimproved.

Description

Technical field [0001] The present invention belongs to the technical field of lithium ion batteries, and more particularly to a battery negative electrode sheet and a preparation method thereof, and a lithium ion battery. Background technique [0002] With the development of society, urban traffic has caused pollution problems that have caused human attention. Hybrid Cars (HEV) Since the need to stop the launching environment, it is low, and the energy consumption is low, no environmental pollution, etc. is rapidly developed. HEV does not have external charging equipment, need to be stored and consumed in the stop and starting process, so you need to have the ability to quickly deinterolize lithium ions under larger pulse current to provide higher charge and discharge power, and Smaller internal resistance to reduce the consumption of battery own energy. [0003] The general idea of ​​currently increasing battery power is to optimize the electrode material structure, improve the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M4/04H01M10/0525
CPCH01M4/0404H01M4/131H01M4/133H01M4/134H01M4/1391H01M4/1393H01M4/1395H01M10/0525H01M2220/20Y02E60/10
Inventor 周宾韩志松孙小嫚吴宁宁吴可
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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