Foam metal/lithium iron phosphate integral electrode with three-dimensional structure, preparation method thereof and lithium ion battery using integral electrode as positive pole piece
A foam metal and lithium iron phosphate technology, applied in battery electrodes, secondary batteries, structural parts, etc., can solve the problems of poor charging and discharging performance at high rates, and achieve the effects of improving ion conductivity, cost reduction, and good conductivity
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specific Embodiment approach 1
[0021] Embodiment 1: This embodiment is a three-dimensional structure metal foam / lithium iron phosphate integrated electrode. The three-dimensional structure metal foam / lithium iron phosphate integrated electrode uses foam metal as a support and a current collector. Nano-lithium iron phosphate particles are placed on the surface of the metal foam In situ generated and fixed on the surface of the metal foam skeleton; wherein, the metal foam is a three-dimensional metal foam with a thickness of 300 μm to 1000 μm after rolling; the nano-lithium iron phosphate particles are generated in situ on the surface of the metal foam And fixed on the skeleton surface of the metal foam is achieved by the following operations: by infiltrating the rheological body obtained by ferric salt, phosphorus source compound, lithium source compound, organic small molecule carbon source and deionized water into the The three-dimensional precursor is obtained in the voids of the metal foam, and then the t...
specific Embodiment approach 2
[0026] Embodiment 2: This embodiment differs from Embodiment 1 in that the metal foam is a three-dimensional metal foam with a thickness of 600 μm to 1000 μm after rolling. Other parameters are the same as in the first embodiment.
[0027] In this embodiment, the thickness after rolling treatment is preferably 800 μm to 950 μm, most preferably 900 μm.
[0028] When the metal foam is a three-dimensional metal foam with a thickness of 900 μm after rolling, the metal foam / lithium iron phosphate three-dimensional electrode material is the surface density of lithium iron phosphate in the positive pole piece is about 100g / m 2 .
specific Embodiment approach 3
[0029] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the metal foam is nickel foam or aluminum foam. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
[0030] The metal foam used in this embodiment has a high specific surface area and good conductivity. Using it as a support and a current collector can form a three-dimensional conductive network, which increases the electronic conductivity of the material and at the same time increases the surface area of the electrochemical reaction. increased, thereby significantly reducing the interface current density during the electrochemical reaction and reducing the polarization of the electrochemical reaction; the special microscopic morphology of the three-dimensional porous material and the larger specific surface area provide more active sites for lithium ions; The thin pore wall effectively reduces the diffusion path of lithium ions and reduces the ion diffusion ...
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