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Lithium ion battery with high energy density

A lithium-ion battery, high energy density technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of poor conductivity, slow charging rate, low compaction density, etc. Cycle performance, improved rate performance, high specific energy effect

Pending Publication Date: 2021-10-26
PHENIX NEW ENERGY HUIZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the lithium iron phosphate cathode material has the characteristics of high safety, long life, low cost and high voltage platform, but the conductivity of lithium iron phosphate itself is poor, and the slow diffusion of lithium ions causes the battery to charge and discharge at a high rate. The energy density of the battery is low, the compaction density is small, the gram capacity is small, the charging rate is slow, and the battery life is poor

Method used

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  • Lithium ion battery with high energy density

Examples

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preparation example Construction

[0024] The preparation method of the positive electrode active material used in the examples is as follows: Stir the liquid polyacrylonitrile oligomer-ethanol solution with a concentration of 50% at 90-120° C. for 9-12 hours, add lithium nickel manganate material LiNi 0.5 mn 1.5 o 4 / LiNi x co y mn 1-x-y o 2 Mix evenly, evaporate completely at 75-85°C, fully cross-link at 200-220°C, calcinate at 850-1000°C for 10-20 hours in an air atmosphere, and carbonize to obtain the positive electrode active material.

[0025] The positive electrode conductive agent is graphene.

Embodiment 1

[0027] A lithium-ion battery with high energy density, comprising a positive electrode sheet, a negative electrode sheet, a diaphragm and an electrolyte, the positive electrode sheet includes a positive electrode current collector and a positive electrode composite material, and the positive electrode composite material includes a positive electrode active material, a positive electrode conductor and an adhesive binder; the positive electrode conductive agent includes lithium iron phosphate coated with carbon nanotubes; the positive electrode active material has a core-shell structure, and the shell layer is LiNi coated with graphene 0.5 mn 1.5 o 4 , the core layer is LiNi 0,9 co 0.05 mn 0.05 o 2 , the shell material is 15% of the mass of the core material, LiNi 0.5 mn 1.5 o 4 The mass accounts for 90% of the total mass of the shell material; the binder is sodium carboxymethyl cellulose, polyolefin and styrene-butadiene rubber in a mass ratio of 0.6:1.5:3.

[0028] The...

Embodiment 2

[0030] A lithium-ion battery with high energy density, comprising a positive electrode sheet, a negative electrode sheet, a diaphragm and an electrolyte, the positive electrode sheet includes a positive electrode current collector and a positive electrode composite material, and the positive electrode composite material includes a positive electrode active material, a positive electrode conductor and an adhesive binder; the positive electrode conductive agent includes lithium iron phosphate coated with carbon nanotubes; the positive electrode active material has a core-shell structure, and the shell layer is LiNi coated with graphene 0.5 mn 1.5 o 4 , the core layer is LiNi 0,9 co 0.05 mn 0.05 o 2 , the shell material is 15% of the mass of the core material, LiNi0.5 mn 1.5 o 4 The mass accounts for 90% of the total mass of the shell material; the binder is sodium carboxymethyl cellulose, polyolefin and styrene-butadiene rubber with a mass ratio of 0.6:1.5:3; the positive ...

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Abstract

The invention belongs to the technical field of lithium ion batteries. A lithium ion battery with high energy density comprises a positive plate, a negative plate, a diaphragm and an electrolyte, the positive plate comprises a positive current collector and a positive composite material, and the positive composite material comprises a positive active material, a positive conductive agent and a binder; the positive electrode conductive agent comprises lithium iron phosphate coated with a carbon nano tube; and the positive active material has a shell-core structure, a shell layer is LiNi0. 5Mn1. 5O4 coated with graphene, a core layer is LiNixCoyMn1-x-yO2, x is greater than or equal to 0.1 and less than or equal to 0.9, y is greater than or equal to 0.05 and less than or equal to 0.9, x + y is greater than or equal to 0.1 and less than or equal to 0.95, the material of the shell layer accounts for 5-25% of the mass of the material of the core layer, and the mass of LiNi0. 5Mn1. 5O4 accounts for 90-95% of the total mass of the material of the shell layer. The lithium ion battery disclosed by the invention has relatively high energy density, electrochemical performance, rate capability and cycling stability.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion battery with high energy density. Background technique [0002] Lithium-ion batteries have the characteristics of high energy density, high average output voltage, large output power, low self-discharge, high charge and discharge efficiency, and no memory effect, and have a wide range of applications. The positive electrode materials of lithium-ion batteries mainly include lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate, etc. Among them, the lithium iron phosphate cathode material has the characteristics of high safety, long life, low cost and high voltage platform, but the conductivity of lithium iron phosphate itself is poor, and the slow diffusion of lithium ions causes the battery to charge and discharge at a high rate. The energy density of the battery is low, the compaction density is small, the...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/13H01M4/139H01M4/505H01M4/525H01M10/0525
CPCH01M10/0525H01M4/364H01M4/366H01M4/525H01M4/505H01M4/13H01M4/139Y02E60/10
Inventor 李继春郑康宁王栋张素容蒙金凤宋冬
Owner PHENIX NEW ENERGY HUIZHOU CO LTD
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