Composite active material, lithium ion battery composite positive electrode material, lithium ion battery positive electrode, lithium ion battery and preparation method, application
A composite cathode material, lithium-ion battery technology, applied in secondary battery charging/discharging, battery electrodes, secondary batteries, etc., can solve the problem of insufficient energy specific density and high
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[0045] The fifth aspect of the present invention provides a method for preparing a lithium-ion battery, comprising: assembling a lithium-ion battery containing the positive electrode of the lithium-ion battery of the present invention, and forming the lithium-ion battery, and the formation process includes:
[0046] (a) calculate the formation capacity of described lithium-ion battery according to formula (1);
[0047] C 化成 =C 设计 *(1.08+η 0 *C 0 / ((1-η 0 )*C)), formula (1),
[0048] Among them, C 化成 It is the capacity that needs to be charged when the lithium-ion battery is charged in the formation stage, and the unit is Ah,
[0049] C 设计 Be the design capacity of described lithium ion battery, the unit is Ah,
[0050] n 0 For the lithium-ion battery, the high-nickel ternary material accounts for the weight percentage of the sum of lithium iron phosphate and high-nickel ternary,
[0051] C 0 is the overcharged failure capacity of pure high-nickel ternary raw materia...
Embodiment 1A-12A and comparative example 1
[0076] Embodiment 1A-12A and comparative example 1AD-3AD
[0077] Embodiment 1A-12A and comparative example 1AD-3AD prepare lithium-ion electron composite positive electrode material according to the composition and content listed in Table 1, the numbering of the lithium ion electron composite positive electrode material that is prepared is respectively marked as 1A-18A and 1AD- 3 AD. In Table 1, the "LiFePO 4 with LiNi 1-x-y co x mn y o 2 The parts by weight and "refer to 100 parts by weight based on the entire lithium-ion battery, LiFePO 4 with LiNi 1-x-y co x mn y o 2 The parts by weight of the sum of the weights; the "parts by weight of conductive agent CNT" and "parts by weight of binder PVDF" respectively refer to the parts by weight of CNT and PVDF based on 100 parts by weight of the entire lithium-ion battery; The "LiFePO 4 with LiNi1-x-y co x mn y o 2 The weight ratio" refers to LiFePO 4 The weight of LiNi 1-x-y co x mn y o 2 weight ratio. In the l...
Embodiment 1B-11B and comparative example 1BD-3B
[0083] Embodiment 1B-11B and comparative example 1BD-3BD respectively take the above-mentioned prepared lithium-ion electron composite cathode materials numbered 1A-11A and 1AD-3AD for the preparation of lithium-ion batteries. The preparation process includes the following steps:
[0084] (1) Preparation of positive electrode: Lithium-ion battery composite positive electrode materials numbered 1A-11A and 1AD-3AD were respectively taken and mixed uniformly to prepare slurry. The obtained slurry was evenly coated on an aluminum foil with a thickness of 0.02 mm, and dried in a vacuum oven for 24 hours to prepare a positive electrode sheet.
[0085] (2) Preparation of negative electrode: use graphite as negative electrode material, super P as conductive agent, sodium hydroxymethyl cellulose (CMC) + styrene-butadiene rubber (SBR) as binder, according to 95.3:1:1.7:2 The weight ratio was uniformly mixed to prepare a slurry, and deionized water was added in the preparation process, a...
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