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High-energy-density lithium ion power battery

A high-energy-density, power battery technology, applied in battery electrodes, secondary batteries, non-aqueous electrolyte batteries, etc., can solve the problems of unsatisfactory energy density, large volume expansion, low Coulomb efficiency, etc., and achieve better cycle performance. Poor, increased electron conductivity, high energy density and high effect

Inactive Publication Date: 2018-03-20
SHENZHEN BAK POWER BATTERY CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The embodiment of the present invention is to solve the above-mentioned problems in the existing lithium-ion power battery that the silicon negative electrode material has a low initial charge-discharge Coulombic efficiency, large volume expansion occurs during the charge-discharge process, and the energy density cannot meet the requirements, etc., and provides a High energy density lithium-ion power battery

Method used

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Examples

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Embodiment 1

[0054] A high-energy-density lithium-ion power battery includes a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and battery case accessories.

[0055] Wherein, the positive electrode sheet includes a positive electrode material layer, and the formula of the positive electrode sheet is composed of the following components according to mass percentage: LiNi 0.88 co 0.07 Al 0.05 o 2 Ternary material 98%, CNTs (10nm) 0.3%, conductive carbon black Super P0.5%, PVDF binder 1.2%;

[0056] The negative electrode material is silicon carbon negative electrode material according to the mass percentage (conductive carbon coated silicon carbide, wherein the content of silicon is 12%, 0.2C gram capacity 500mAh / g, initial efficiency 87%), its consumption is 97.5%; conductive agent is 0.1 The combination of % SWCNT, 0.6% Super P and 0.3% graphene; the binder is 1.5% PI; the diaphragm is 12 μm (ceramic thickness 3 μm, porosity 50%, PE film);

[0057] Th...

Embodiment 2

[0068] A high-energy-density lithium-ion power battery includes a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and battery case accessories.

[0069] Wherein, the positive electrode sheet includes a positive electrode material layer, and the formula of the positive electrode sheet is composed of the following components according to mass percentage: LiNi 0.8 co 0.15 Al 0.05 o 2 Ternary material 98%, graphene 0.3%, conductive carbon black Super P 0.5%, PVDF binder 1.2%;

[0070] The negative electrode material is silicon carbon negative electrode material according to the mass percentage (conductive carbon coated silicon carbide, wherein the content of silicon is 10%, 0.2C gram capacity 500mAh / g, initial efficiency 87%), its consumption is 97.5%; conductive agent is 0.1 The combination of % CNTs, 0.6% Super P and 0.3% graphene; the binder is 1.5% styrene-butadiene rubber; the diaphragm is 12 μm (ceramic thickness 3 μm, porosity 50%, PE f...

Embodiment 3

[0074] A high-energy-density lithium-ion power battery includes a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, and battery case accessories.

[0075] Wherein, the positive electrode sheet includes a positive electrode material layer, and the formula of the positive electrode sheet is composed of the following components according to mass percentage: LiNi 0.8 co 0.1 mn 0.1 o 2Ternary material 98%, CNTs (10nm) 0.3%, conductive carbon black Super P0.5%, PVDF binder 1.2%;

[0076] The negative electrode material is silicon carbon negative electrode material (conductive carbon coated SiO x , wherein the content of silicon is 10%, the 0.2C gram capacity is 500mAh / g, and the first efficiency is 87%), and its dosage is 97.5%; the conductive agent is 0.1% of SWCNT, 0.6% of Super P and 0.3% of graphene Combination; the binder is 1.5% PI; the diaphragm is 12 μm (ceramic thickness 3 μm, porosity 50%, PE film);

[0077] The electrolyte contains 12...

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Abstract

The invention in particular discloses a high-energy-density lithium ion power battery. The battery comprises an anode piece, a cathode piece, a diaphragm, electrolyte and a battery case accessory, wherein the anode piece is composed of an anode current collector, an anode material coated on the surface of the anode current collector, an anode conductive agent and an anode binder; the cathode pieceis composed of a cathode current collector, a cathode material coated on the surface of the cathode current collector, a cathode conductive agent and a cathode binder, the anode material is a Ni-Co-Mn or Ni-Co-Al ternary anode material, and the cathode material is conductive carbon source coated silicon carbide or SiOx. The high-energy-density lithium ion power battery provided by the embodimentof the invention has the initial coulomb efficiency reaching 86.5% and the mass energy density reaching up to 280Wh / kg and can meet high energy density and long cycle life requirements of the power battery.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, in particular to a lithium ion power battery with high energy density. Background technique [0002] Lithium-ion power batteries have great application prospects in the field of new energy vehicles, and have attracted close attention from domestic and foreign scientific researchers and business units. [0003] At present, lithium iron phosphate batteries have once become the mainstream in the domestic market due to their good cycle stability and safety. However, as consumers' awareness of new energy vehicles gradually matures, and the demand for electric vehicle performance continues to escalate, the bottleneck of lithium iron phosphate batteries in terms of energy density is increasingly revealed. For example, in the "Energy Saving and New Energy Automobile Industry Development Plan (2012-2020)" promulgated by the State Council of my country in 2012, it was proposed that by 2015, ...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/0525H01M4/36H01M4/38H01M4/48H01M4/583H01M4/62H01M4/505H01M4/525
CPCH01M4/366H01M4/386H01M4/48H01M4/505H01M4/525H01M4/583H01M4/625H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 易先文宋华杰孙云龙
Owner SHENZHEN BAK POWER BATTERY CO LTD
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