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Aqueous lithium (sodium) ion battery mixed negative material

A technology for ion batteries and negative electrode materials, applied in battery electrodes, electrode manufacturing, circuits, etc., can solve the problems of small theoretical capacity of lithium titanium phosphate, serious hydrogen evolution problem, low specific energy, etc., and achieve low production cost, high safety, Effect of long cycle life

Inactive Publication Date: 2015-07-15
FUDAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the relatively low potential of lithium titanium phosphate, at -0.76V (for saturated calomel reference electrode), the problem of hydrogen evolution is more serious, and the theoretical capacity of lithium titanium phosphate is relatively small
In addition, we have recently proposed organic compounds as negative electrode materials for aqueous lithium-ion batteries, such as polyimide, which has a large theoretical capacity and a high voltage platform, but its conductivity is poor, and it must be mixed with a large amount of conductive carbon to work, which leads to its The problem of low specific energy
Of course, there are also carbon materials that can conduct electricity directly as negative electrode materials, such as activated carbon, but their capacity is low, and the voltage platform is mostly inclined, which is not conducive to practical application.

Method used

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  • Aqueous lithium (sodium) ion battery mixed negative material

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Effect test

Embodiment 1

[0016] The mixed anode material uses 1, 4, 5, 8 naphthalene tetracarboxylic dianhydride as the substrate and polyimide (PI) polymerized with ethylenediamine, carbon-coated LiTi 2 (PO 4 ) 3 , acetylene black (conductive material), the mixed mass ratio of the three is LiTi 2 (PO 4 ) 3 : PI: acetylene black = 60:30:10, the mixing method is grinding mixing. After the mixing is completed, add a binder with a mass ratio of 5% of the total mass to mix the slurry, then evenly coat it on the stainless steel mesh current collector, and press it into an electrode after drying. The positive electrode material adopts spinel type LiMn for commercial lithium-ion batteries 2 O 4 . The composition of the positive electrode is based on LiMn 2 O 4 : carbon black: binder = 85:5:10 weight ratio mixed slurry, evenly coated on the stainless steel mesh current collector, dried and pressed into electrodes. In this embodiment, the actual capacity of the positive electrode material is 100 mAh / ...

Embodiment 2

[0018] The mixed anode material uses 1, 4, 5, 8 naphthalene tetracarboxylic dianhydride as the substrate and polyimide (PI) polymerized with ethylenediamine, carbon-coated LiTi 2 (PO 4 ) 3 , acetylene black (conductive material), the mixed mass ratio of the three is LiTi 2 (PO 4 ) 3 : PI: acetylene black = 50:30:20, the mixing method is grinding mixing. After the mixing is completed, add a binder with a mass ratio of 5% of the total mass to mix the slurry, then evenly coat it on the stainless steel mesh current collector, and press it into an electrode after drying. The positive electrode material adopts spinel type LiMn for commercial lithium-ion batteries 2 O 4 . The composition of the positive electrode is based on LiMn 2 O 4: carbon black: binder = 85:5:10 weight ratio mixed slurry, evenly coated on the stainless steel mesh current collector, dried and pressed into electrodes. In this embodiment, the actual capacity of the positive electrode material is 100 mAh / g...

Embodiment 3

[0020] The mixed anode material uses 1, 4, 5, 8 naphthalene tetracarboxylic dianhydride as the substrate and polyimide (PI) polymerized with ethylenediamine, carbon-coated LiTi 2 (PO 4 ) 3 , acetylene black (conductive material), the mixed mass ratio of the three is LiTi 2 (PO 4 ) 3 : PI: acetylene black = 30:50:20, the mixing method is grinding mixing. After the mixing is completed, add a binder with a mass ratio of 5% of the total mass to mix the slurry, then evenly coat it on the stainless steel mesh current collector, and press it into an electrode after drying. The positive electrode material adopts spinel type LiMn for commercial lithium-ion batteries 2 O 4 . The composition of the positive electrode is based on LiMn 2 O 4 : carbon black: binder = 85:5:10 weight ratio mixed slurry, evenly coated on the stainless steel mesh current collector, dried and pressed into electrodes. In this embodiment, the actual capacity of the positive electrode material is 100 mAh / ...

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Abstract

The invention belongs to the technical field of batteries, and particularly relates to an aqueous lithium (sodium) ion battery mixed negative material. The mixed negative material is prepared by mixing three materials including ion embedded type compounds, conductive materials, organic compounds capable of reversibly storing alkali metal or alkaline earth metal ions or high-molecular polymers in a certain mass proportion; a mixing way comprises the steps of in-situ growth and direct mechanical mixing of all the composition parts. An aqueous lithium (sodium) ion battery assembled by using the mixed electrode material as a negative electrode has the characteristics of long cycle life, high power, high security, low cost and no environment pollution, and is particularly suitable for power batteries used in short-distance electromobiles and energy storage batteries used in smart power grids.

Description

technical field [0001] The invention belongs to the technical field of batteries, and in particular relates to an electrode material for an aqueous lithium (sodium) ion battery. Background technique [0002] With the continuous development of the economy, it will inevitably lead to the depletion of natural resources such as oil and coal, environmental pollution and the aggravation of the global greenhouse effect. Human beings must grasp the balance between the three-in-one "three Es" of economic growth, environmental protection and energy supply. The world's annual energy consumption is now about 8 billion tons of oil, of which 90% are fossil fuels. At the current rate of consumption, it will be exhausted in about 100 to 200 years. The comprehensive and efficient development and utilization of new energy, energy-saving technology and environmental protection technology has become a very urgent topic. It is imperative to develop electric vehicles. Countries around the worl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/60H01M4/583H01M4/04
CPCH01M4/04H01M4/362H01M4/366H01M4/5825H01M4/622H01M4/625Y02E60/10
Inventor 夏永姚王永刚陈龙
Owner FUDAN UNIV
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