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Long-service-life lithium ion battery and manufacture method thereof

A lithium-ion battery, long-life technology, used in the manufacture of electrolyte batteries, battery electrodes, secondary batteries, etc., can solve the problems of short cycle life, poor low temperature performance, low energy density, etc., to achieve a wide operating temperature range and safety. The effect of good, good low temperature and high temperature discharge characteristics

Inactive Publication Date: 2014-02-05
TIANJIN ENERGIES
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the purpose of the present invention is to overcome the disadvantages of low energy density, short cycle life, and poor low temperature performance of lithium-ion batteries in the prior art, and adopt lithium-rich manganese-based materials as positive electrodes and hard carbon or soft carbon as negative electrodes. The material system provides a lithium-ion battery with high energy density, good cycle performance, wide temperature range and good safety, which meets the requirements of the energy storage system

Method used

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  • Long-service-life lithium ion battery and manufacture method thereof
  • Long-service-life lithium ion battery and manufacture method thereof

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preparation example Construction

[0031] The invention provides the preparation method of described a kind of long-life lithium-ion battery, comprises the following steps:

[0032] The preparation of positive electrode slurry and negative electrode slurry includes the following steps: adding 70-95% (weight ratio) of positive electrode active material, 3-28% (weight ratio) of conductive agent, and 2-27% (weight ratio) of binder In an organic solvent, after high-speed stirring, it is configured into a positive electrode slurry; 80-95% (weight ratio) of the negative electrode active material, 3-18% (weight ratio) of the conductive agent, and 2-17% (weight ratio) of the binder are respectively Add organic solvent or deionized water, after high-speed stirring, prepare negative electrode slurry;

[0033] The preparation of the positive electrode sheet and the negative electrode sheet includes the following steps: uniformly coat the positive electrode slurry on both sides of the aluminum foil through a coating machin...

Embodiment 1

[0039] (1) Preparation of positive electrode slurry and negative electrode slurry: 0.3Li 2 MnO 3 0.7LiNiMnO 2 , 5.5% (weight ratio) of conductive carbon black and 3.5% (weight ratio) of PVDF were added to NMP, and evenly mixed into positive electrode slurry after high-speed stirring; 91.5% (weight ratio) of hard carbon, 4% (weight ratio) of conductive carbon black, 1.5% (weight ratio) of CMC and 3% (weight ratio) of SBR were added to deionized water, and uniformly mixed into negative electrode slurry after high-speed stirring.

[0040] (2) Preparation of positive electrode sheet: The prepared positive electrode slurry was uniformly coated on both sides of the aluminum foil by a coating machine, and the surface density of one side was 16 mg / cm 2 , after drying and rolling, the positive electrode sheet was obtained with a compacted density of 2.8g / cm 3 . Preparation of negative electrode sheet: The prepared negative electrode slurry is evenly coated on both sides of the copp...

Embodiment 2

[0047] (1) Preparation of positive electrode slurry and negative electrode slurry: 0.3Li 2 MnO 3 0.7LiNiMnO 2 , 3% (weight ratio) of conductive carbon black and 2% (weight ratio) of PVDF were added to NMP respectively, and evenly mixed into positive electrode slurry after high-speed stirring; 95% (weight ratio) of soft carbon, 3% (weight ratio) of conductive carbon black, 1% (weight ratio) of CMC and 1% (weight ratio) of SBR were added to deionized water, and mixed uniformly to form negative electrode slurry after high-speed stirring.

[0048] (2) Preparation of positive electrode sheet: The prepared positive electrode slurry is evenly coated on both sides of the aluminum foil by a coating machine, and the surface density of one side is 15 mg / cm 2 , after drying and rolling, the positive electrode sheet was obtained with a compacted density of 2.8g / cm 3 . Preparation of negative electrode sheet: The prepared negative electrode slurry is evenly coated on both sides of the c...

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Abstract

The invention discloses a long-service-life lithium ion battery and a manufacture method thereof. The long-service-life lithium ion battery comprises an anode material, a cathode material, a diaphragm and electrolyte. The long-service-life lithium ion battery provided by the invention has the advantages of excellent charge and discharge circulating performances, good low-temperature and high-temperature discharge characteristics, wide use temperature range and good safety, and can be used for storing and converting clean energy as an energy storage system.

Description

technical field [0001] The invention relates to a lithium ion battery for energy storage, in particular to a long-life lithium ion battery and a preparation method thereof. Background technique [0002] Energy storage system is an important guarantee for promoting the construction of smart grid, developing clean energy and renewable energy, and realizing low-carbon economy, energy conservation and emission reduction. Lithium-ion batteries have been demonstrated in smart grids as energy storage systems. At present, lithium-ion batteries for energy storage mainly use lithium iron phosphate / graphite system. Although lithium iron phosphate has the advantages of environmental friendliness and stable structure, it has low platform voltage, poor conductivity, poor rate and low temperature performance, and poor batch stability. On the other hand, in lithium-ion batteries using graphite as the negative electrode active material, lithium ions are embedded between the graphite layers...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M4/62H01M10/058
CPCY02E60/122H01M4/505H01M4/5835H01M4/622H01M4/625H01M10/058Y02E60/10Y02P70/50
Inventor 马华从长杰王驰伟冯树南孙翠平赵珊珊
Owner TIANJIN ENERGIES
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