Positive electrode active material, positive electrode sheet and lithium ion secondary battery
A technology of positive electrode active materials and secondary particles, applied in secondary batteries, active material electrodes, positive electrodes, etc., can solve the problems of poor high-temperature cycle performance of lithium-ion secondary batteries, and achieve improved structural stability and high-temperature cycle stability performance, improve deformation resistance, and prevent cracking
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preparation example Construction
[0077] Next, a method of preparing a positive electrode active material will be described next. Any of the above positive electrode active materials can be prepared according to the preparation method. Preparation methods include:
[0078] The positive electrode active material precursor, lithium source, and doped element precursors were mixed, and the sintering treatment was performed to obtain a positive electrode active material.
[0079] The positive electrode active material precursor may be one or more of the compounds containing Ni and optionally Co and / or Mn, for example, in accordance with the chemical metering ratio. Hydroxides of Ni, CO, and Mn.
[0080] The positive electrode active material precursor can be obtained by a method known in the art, such as by a co-precipitation method, a gel method or a solid phase method.
[0081] As an example, the Ni source, the CO source and the Mn source are dispersed in a solvent to obtain a mixed solution; the mixed solution, a ...
Embodiment 1
[0123] Preparation of positive active materials
[0124] Doping element is Sb, the doping element precursor antimony oxide (Sb 2 O 3 ) Roughly divided into three batches of Sb doping. Preparation methods include:
[0125] The positive electrode active material precursor [Ni 0.8 CO 0.1 Mn 0.1 ] (OH) 2 , Lithium hydroxide LiOH and second batches of antimony trioxide was added 1-speed mixer for compounding IH, to give mixed material, wherein the positive electrode active material precursor with lithium hydroxide in a molar ratio of Li / Me is 1.05, Me represents the positive electrode active material precursor in the total molar amount of Ni, Co, Mn; and sintering the mixed material into an atmosphere furnace for first firing, a sintering temperature of 830 ℃, sintering time is 5h, the sintering atmosphere is O 2 A concentration of 90% oxygen-containing atmosphere.
[0126] The first firing process and the second batch of the product of antimony oxide added high-speed mixer for comp...
Embodiment 2~13 and Embodiment 16~24
[0139] Unlike Example 1, the positive electrode active material preparing step change in the parameters, selected doping element oxide as its source, and to adjust the respective quantities of doping elements mixed content, the sintering temperature of 800 ℃ ~ 850 ℃, total the sintering time 15h ~ 25h, to obtain a predetermined doping element type, doping uniformity and doping amount of the positive electrode active material, in table 1 and table 2.
[0140] Relates to a multi-element-doped Example 4 and Example 12, each of the doping element content is substantially the same.
[0141] And a positive electrode active material precursor of Examples 22 to 24 [Ni 0.5 CO 0.2 Mn 0.3 ] (OH) 2 .
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