Positive paste containing secondary-layer graphene and preparation method of positive paste
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A positive electrode slurry and graphene technology, applied in graphene, battery electrodes, secondary batteries, etc., can solve problems such as personal injury, hidden dangers, heat dissipation, etc., to prolong battery life, improve safety, and increase thermal conductivity Effect
Inactive Publication Date: 2018-01-05
昆山正国新能源动力电池有限公司
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[0004] However, the positive electrode materials of lithium ion batteries in the prior art are generally ternary and lithium iron phosphate, and the added graphene additive is only ordinary graphene, which is a sheet-like carbon structure, which has good thermal and electrical conductivity in the sheet. However, due to the existence of the Dirac point (electrical neutral point) between the sheets, the mutual sheets are almost in an isolated state. In the case of large current and high heat generation, the heat cannot be dissipated in time. There are potential safety hazards, and even an explosion may cause personal injury, which is very dangerous
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Embodiment 1
[0037] Embodiment 1: described lithium iron phosphate is 56%, described NMP is 24%, described PVDF is 2.5%, described SP is 16.5% and described sublayer graphene is 1.0%;
[0038] The weight ratio of described multilayer graphene sheet and described diamond is 18.5:1;
[0039] The number of layers of the multilayer graphene sheet is 5 layers, and the thickness of each layer of the multilayer graphene sheet is 0.5nm; the interlayer distance between two adjacent layers of the multilayer graphene sheet is 0.3 nm. nm;
[0040] The diamond is spherical carbon, and the particle size of the spherical carbon is 0.9nm.
Embodiment 2
[0041] Embodiment 2: the lithium iron phosphate is 59%, the NMP is 21.6%, the PVDF is 3.5%, the SP is 15% and the sublayer graphene is 0.9%;
[0042] The weight ratio of described multilayer graphene sheet and described diamond is 18:1;
[0043] The number of layers of the multi-layer graphene sheet is 4 layers, and the thickness of each layer of the multi-layer graphene sheet is 0.4nm; the interlayer distance between two adjacent layers of the multi-layer graphene sheet is 0.2 nm. nm;
[0044] The diamond is spherical carbon, and the particle size of the spherical carbon is 0.7nm.
Embodiment 3
[0045] Embodiment 3: the lithium iron phosphate is 58.1%, the NMP is 21%, the PVDF is 3.2%, the SP is 17% and the sublayer graphene is 0.7%;
[0046] The weight ratio of described multilayer graphene sheet and described diamond is 18.7:1;
[0047] The number of layers of the multilayer graphene sheet is 3 layers, and the thickness of each layer of the multilayer graphene sheet is 0.2nm; the interlayer distance between two adjacent layers of the multilayer graphene sheet is 0.4 nm. nm;
[0048] The diamond is spherical carbon, and the particle size of the spherical carbon is 1.6 nm.
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Abstract
The invention discloses positive paste containing secondary-layer graphene and a preparation method of the positive paste. The positive paste comprises a main material, a solvent and an additive, wherein the content of the main material accounts for 56-59wt%, the content of NMP accounts for 21-24wt%, the content of PVDF accounts for 2-3.5wt%, the content of SP accounts for 15-17wt%, the content ofthe secondary-layer graphene accounts for 0.7-1.2wt%, the secondary-layer graphene comprise multi-layer sheet-shaped graphene and diamonds, the diamonds are arranged between adjacent two layers of the multi-layer sheet-shaped graphene and are in one-to-one correspondence to carbon atoms of the multi-layer sheet-shaped graphene, and the weight ratio of the secondary-layer graphene and the diamondsis (18-19):1. The positive paste is reasonable in formula and excellent in heat conductivity, the secondary-layer graphene is a new material of 3-5 layers of sheet-shaped graphene doped with the diamonds, the added diamonds are spherical carbon, so that adjacent layers of the multi-layer sheet-shaped graphene are conducted, and the electrical conductivity of the material is improved; and therefore, the thermal conductivity is improved under the condition that other structures of a battery are not changed, heat generated by power generation is timely dissipated, and the energy consumption is effectively reduced when the battery is discharged with a relatively large current.
Description
technical field [0001] The invention relates to the technical field of positive electrode slurry for lithium ion batteries and its preparation, in particular to a positive electrode slurry containing a new graphene material and a preparation method thereof. Background technique [0002] Lithium-ion battery: It is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between the positive and negative electrodes to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between two electrodes: when charged, Li + It is deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. Batteries generally use materials containing lithium elements as electrodes, which are representatives of modern high-performance batteries. [0003] At present, research on lithium-i...
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Application Information
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