Positive electrode of lithium ion battery

A lithium-ion battery and positive electrode technology, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve the problems of low battery performance, low electrode conductivity, discharge specific capacity attenuation, etc., and reduce high-speed stirring. time, overcome the low conductivity, and enhance the effect of conductivity

Inactive Publication Date: 2016-07-20
GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

RosalindJ.Gummow et al. selected Lil.25(3)Ni0.17(1)Mn0.61(1)O2 as the active material, and the conductive agent was superconducting carbon black. The capacity is 255mAh / g, but the discharge specific capacity in the second week decays to 225mAh / g (Journal of The Electrochemical Society, 160(10)A1856-A1862(2013))
The formulations of the conductive agents in these disclosed battery designs are all a simple mixture of one or two or three conductive agents, and the performance of the battery is low. One of the influencing factors is the low conductivity of the pole piece.

Method used

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  • Positive electrode of lithium ion battery
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Experimental program
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Effect test

Embodiment 1

[0021] The active material of the positive electrode is 0.6Li 2 O 0.8Mn 0.675 Ni 0.1625 co 0.1625 o 1.75 , the conductive agent selects nanoscale conductive carbon black (SuperP), carbon nanotubes, and graphene. Calculated according to weight percentage, SuperP accounts for 33.33% by weight of the conductive agent, and graphene accounts for 33.33% by weight of the conductive agent. The weight percentage of the nanotubes in the conductive agent is 33.33%. The binder is polyvinylidene fluoride (PVDF), and the solvent is N-methylpyrrolidone. The weight percentage of active material: conductive agent: binder is 80:10:10. Dissolve 0.500g of PVDF in 9.500g of N-methylpyrrolidone to form a PVDF solution; then weigh 0.167g of SuperP, 0.167g of graphene, and 0.167g of carbon nanotubes, and add the weighed conductive agent to about 2.000g of N-methylpyrrolidone, ultrasonically disperse for 0.3h; then add binder solution and 4.000g of active material, and stir at high speed for 0.5...

Embodiment 2

[0023] The active material of the positive electrode is 0.6Li 2 O 0.8Mn 0.675 Ni 0.1625 co 0.1625 o 1.75 The conductive agent is selected from nano-scale conductive carbon black SuperP, graphene, and carbon nanofibers. According to the weight percentage, SuperP accounts for 33.33% by weight of the conductive agent, and graphene accounts for 33.33% by weight of the conductive agent. Carbon nanofibers It accounts for 33.33% by weight of the conductive agent. The binder is polyvinylidene fluoride (PVDF), and the solvent is N-methylpyrrolidone. The weight percentage of active material: conductive agent: binder is 80:10:10. Dissolve 0.500g of PVDF in 9.500g of N-methylpyrrolidone to form a PVDF solution; then weigh 0.167g of SuperP, 0.167g of graphene, and 0.167g of carbon nanofibers, and add the weighed conductive agent to about 2.200g of N-methylpyrrolidone, ultrasonically disperse for 0.5h; then add binder solution and 4.000g of active material, and stir at high speed for ...

Embodiment 3

[0025] The active material of the positive electrode is 0.6Li 2 O 0.8Mn 0.675 Ni 0.1625 co 0.1625 o 1.75 The conductive agent is selected from nano-scale conductive carbon black SuperP, graphene, and carbon nanofibers. Calculated by weight percentage, SuperP accounts for 70% by weight of the conductive agent, and graphene accounts for 10% by weight of the conductive agent. Carbon nanofibers Accounting for 20% by weight of the conductive agent. The binder is polyvinylidene fluoride (PVDF), and the solvent is N-methylpyrrolidone. The weight percentage of active material: conductive agent: binder is 80:10:10. Dissolve 0.500g of PVDF in 9.500g of N-methylpyrrolidone to form a PVDF solution; then weigh 0.350g of SuperP, 0.050g of graphene, and 0.100g of carbon nanofibers, and add the weighed conductive agent to about 2.200g of N-methylpyrrolidone, ultrasonically disperse for 0.5h; then add binder solution and 4.000g of active material, and stir at high speed for 0.2h to form ...

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Abstract

The invention discloses a positive electrode of a lithium ion battery. The positive electrode comprises a conductive substrate and positive paste, wherein the positive paste is coated on the conductive substrate and is formed by the mixing of a conductive agent, an active material and a binding agent, and the conductive agent is a three-dimensional conductive network formed by a zero-dimensional nanometer carbon substance with conductivity, a one-dimensional nanometer carbon substance with conductivity and a second-dimensional nanometer carbon substance with conductivity. In the positive electrode of the lithium ion battery, disclosed by the invention, three different-dimensional nano carbon conductive agents are adopted and mixed, on one hand, the nanoscale carbon conductive agents are beneficial for embedment and escapement of lithium ions, and on the other hand, conductive agents in three dimensions are mixed to form the three-dimensional conductive network, the difficulty of low conductivity of a pole plate brought by the conductive agents is overcome, the electrochemical impedance of the positive electrode is reduced, the conductivity of the pole plate is improved, and the electrochemical performance of the positive electrode is effectively improved.

Description

technical field [0001] The invention relates to a positive electrode of a lithium ion battery, belonging to the technical field of lithium ion batteries. Background technique [0002] In recent years, problems such as serious environmental pollution and energy scarcity have plagued human life. In the past two years, domestic smog has become increasingly serious, directly affecting the health of the people and the development of the domestic economy. One of the causes of smog is vehicle exhaust emissions. Therefore, the state has issued a number of policies to support the development of new energy vehicles. As the main power source of new energy vehicles, lithium-ion batteries have become the focus of attention. As a power battery for large vehicles, lithium-ion batteries cannot meet the requirements in terms of specific energy, cycle life, safety and other aspects. The key factor to solve this problem is not only the development and production of battery materials, but also...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/62H01M10/0525
CPCY02E60/10
Inventor 尹艳萍庄卫东沈雪玲朱磊
Owner GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
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