Composite negative electrode material for lithium ion battery, preparing method thereof, negative electrode using material and lithium ion battery
A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsatisfactory cycle stability, low capacity retention rate, and low hydrothermal method yield, etc., to improve electrochemical performance. Performance, rich sources, low cost effects
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Embodiment 1
[0043] Preparation of negative electrode material: Fe with a particle size of 100 nm 2 o 3 Powder and acetylene black with a particle size of 100nm are mixed in a mass fraction of 3:7, and ball milled on a ball mill, the ball milling medium is acetone, and the ball milled product is dried to obtain Fe 2 o 3 / 70wt.% acetylene black composite powder material (wt.% refers to mass percentage, the same as in the following examples), to obtain the lithium ion battery negative electrode material. The particle size of the composite powder material is 50-200nm, and its scanning electron microscope picture is as follows figure 1 As shown, Fe can be seen in the figure 2 o 3 / Acetylene black has good combination, good dispersion, and particle size is 50-200nm.
[0044] Preparation of the negative electrode: with N-methyl-pyrrolidone (NMP) as solvent, the prepared Fe 2 o 3 / 70wt.% acetylene black composite negative electrode material and binder polyvinylidene fluoride (PVDF) are m...
Embodiment 2
[0050] Preparation of negative electrode material: Fe2O3 powder with a particle size of 10 nm and graphite with a particle size of 10 μm are mixed in a ratio of 7:3 in mass fraction, and ball milled on a ball mill. The ball milling medium is water, and the ball mill product is dried. get Fe 2 o 3 / 30wt.% graphite composite powder material, the particle size of the composite powder material is 50nm-15μm.
[0051] Preparation of the negative electrode: with N-methyl-pyrrolidone (NMP) as solvent, the prepared Fe 2 o 3 % graphite composite negative electrode material and binder polyvinylidene fluoride (PVDF) are uniformly mixed in a mass ratio of 8:1, coated on the current collector copper foil, and then dried to prepare the lithium ion battery negative electrode.
[0052]Preparation of the positive electrode: Using N-methyl-pyrrolidone (NMP) as the solvent, lithium cobaltate, PVDF and conductive agent acetylene black in a weight ratio of 8:1:1 were added to the solvent, and th...
Embodiment 3
[0056] Preparation of negative electrode material: 100nm Fe 2 o 3 and acetylene black of 50nm are mixed on a ball mill with a mass fraction of 4:6, and ball milled on the ball mill, with acetone as the ball milling medium, and the ball milled product is dried to obtain Fe 2 o 3 / 60wt.% acetylene black composite powder material; then the material was calcined at 400°C for 6 hours in a nitrogen atmosphere to carry out carbothermal reduction reaction, and then the sample was cooled to room temperature and then taken out to obtain Fe 2 o 3 / Fe 3 o 4 / Acetylene black composite powder material, the content of acetylene black in the composite material is about 60wt.% (the error is 0~1wt.%), the X-ray diffraction pattern of the composite powder material is as follows Figure 4 As shown, the figure shows that the composite powder material contains Fe 2 o 3 and Fe 3 o 4 Two kinds of iron series oxides, the particle size of the composite powder material is 50-200nm.
[0057] Th...
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