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Ternary lithium ion battery

A technology of lithium-ion batteries and ternary materials, applied in battery electrodes, secondary batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems affecting the contact between positive active material and binder, conductive agent, cycle performance and pole piece compaction density Reduce and affect the problems of conductive electrons and lithium ion transmission, and achieve the effects of avoiding large particle breakage, increasing compaction density, and high safety

Pending Publication Date: 2018-09-04
OPTIMUM BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Traditionally used ternary materials are secondary spherical particles or aggregates composed of primary particles, which are easily deformed during rolling and broken into primary particles with small particle sizes, which affects the positive active material, binder, and conductive agent. Contact, which in turn affects the transmission of conductive electrons and lithium ions, reduces the conductivity of the ternary material, resulting in a decrease in cycle performance and compaction density of the pole piece

Method used

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  • Ternary lithium ion battery
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Embodiment 1

[0026] (1) Preparation of positive electrode sheet: Add single crystal ternary material, carbon nanotubes, conductive carbon black and PVDF into N-methylpyrrolidone (NMP) at a mass ratio of 95.5:0.5:1:3 to prepare positive electrode slurry, Then the positive electrode slurry is coated on the aluminum foil, followed by drying, rolling, slitting and sheeting to obtain a positive electrode sheet containing one tab; wherein, when the coating is controlled, the double-sided coating density of the positive electrode sheet is: 400g / m 2 , when rolling, the compacted density of the positive electrode sheet is 3.5g / cm 3 ;

[0027] (2) Preparation of negative electrode sheet: Add composite graphite, carbon nanotubes, conductive carbon black, CMC and SBR into water according to the mass ratio of 96:0.2:0.8:1:2 to prepare negative electrode slurry, and then coat the negative electrode slurry onto the copper foil, followed by drying, rolling, slitting and sheeting to obtain a negative ele...

Embodiment 2

[0031](1) Preparation of positive electrode sheet: Add single crystal ternary material, carbon nanotubes, conductive carbon black and PVDF into N-methylpyrrolidone (NMP) according to the mass ratio of 96.5:0.5:0.5:2.5 to prepare positive electrode slurry, Then the positive electrode slurry is coated on the aluminum foil, followed by drying, rolling, slitting and sheeting to obtain a positive electrode sheet containing one tab; wherein, when the coating is controlled, the double-sided coating density of the positive electrode sheet is: 450g / m 2 , when rolling, the compacted density of the positive electrode sheet is 3.7g / cm 3 ;

[0032] (2) Production of negative electrode sheet: Add composite graphite, carbon nanotubes, conductive carbon black, CMC and SBR into water according to the mass ratio of 96.5:0.3:0.6:1.1:1.5 to prepare negative electrode slurry, and then coat the negative electrode slurry onto the copper foil, followed by drying, rolling, slitting and sheeting to o...

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Abstract

The invention provides a ternary lithium ion battery. The ternary lithium ion battery comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the positive plate, the diaphragm, and the negative plate are subjected to winding and electrolyte injection, and then the ternary lithium ion battery is assembled; the positive plate comprises a positive current collector and positiveslurry, the positive slurry comprises the following components in parts by weight: 95-97% of a ternary material, 1-2% of a positive conductive agent, 2-3% of PVDF, and the ternary material is a monocrystalline ternary material; the positive conductive agent comprises a carbon nanotube and conductive carbon black; the negative plate comprises a negative current collector and negative slurry, and the negative slurry comprises the following components by mass percentage: 90-97% of a negative active material, 1-2%of a negative conductive agent, 1-2% of CMC, and 1-2% of SBR; the negative active material is composite graphite through complex formulation of primary particles and secondary particles; and the negative conductive agent comprises the carbon nanotube and conductive carbon black. The ternary lithium ion battery increases the cycle performance, and has the advantages of high capacity, excellent circularity, and high safety.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium ion batteries, in particular to a ternary lithium ion battery. 【Background technique】 [0002] The energy density of lithium-ion batteries is inseparable from the positive electrode materials. At present, the commercial cathode material is mainly LiCoO 2 , LiMn 2 o 4 、LiFePO 4 And ternary material LiMO 2 (NCM), the gram capacity of the first three is less than 150mAh / g, and the price of lithium cobalt oxide is more expensive; with the increase of nickel content, the gram capacity of ternary materials can reach 150-200mAh / g, and it is relatively more expensive than lithium cobalt oxide. ,cheap price. [0003] Traditionally used ternary materials are secondary spherical particles or aggregates composed of primary particles, which are easily deformed during rolling and broken into primary particles with small particle sizes, which affects the positive active material, binder, and conductive a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M4/583H01M10/058H01M10/0525
CPCH01M4/505H01M4/525H01M4/583H01M4/62H01M4/621H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 钟莎莎王振峰邓昌源许辉李金林李路伟
Owner OPTIMUM BATTERY CO LTD