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 pos

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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Example Embodiment

[0031] The present invention provides a method for preparing the long-life lithium ion battery, which includes the following steps:

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

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

Example Embodiment

[0038] Example 1

[0039] (1) Preparation of positive electrode slurry and negative electrode slurry: 91% (weight ratio) of lithium-rich manganese-based material 0.3Li 2 MnO 3 ·0.7LiNiMnO 2 , 5.5% (weight ratio) of conductive carbon black, 3.5% (weight ratio) of PVDF were added to the NMP, mixed uniformly into the positive electrode slurry after high-speed stirring; 91.5% (weight ratio) of hard carbon, 4% (Weight ratio) conductive carbon black, 1.5% (weight ratio) CMC and 3% (weight ratio) SBR were added to deionized water, and mixed uniformly into negative electrode slurry after high-speed stirring.

[0040] (2) Preparation of the positive pole piece: the prepared positive electrode slurry is uniformly coated on both sides of the aluminum foil through a coating machine, and the density of one side is 16 mg / cm 2 , After drying and rolling, the positive pole piece is obtained, the compaction density is 2.8g / cm 3 . Preparation of negative pole piece: The prepared negative electrode s...

Example Embodiment

[0046] Example 2

[0047] (1) Preparation of positive electrode slurry and negative electrode slurry: 95% (weight ratio) of lithium-rich manganese-based material 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 mixed uniformly into positive electrode slurry after high-speed stirring; 95% (weight ratio) of soft carbon, 3% (Weight ratio) conductive carbon black, 1% (weight ratio) CMC and 1% (weight ratio) SBR were added to deionized water, and mixed uniformly into negative electrode slurry after high-speed stirring.

[0048] (2) Preparation of the positive pole piece: the prepared positive electrode slurry is evenly coated on both sides of the aluminum foil through a coating machine, and the density of one side is 15 mg / cm 2 , After drying and rolling, the positive pole piece is obtained, the compaction density is 2.8g / cm 3 . Preparation of negative pole piece: The prepared negative electrode ...

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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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