Method for preparing LiNi1-XCOXO2 of anode material of lithium ion secondary battery

A technology of lithium nickel cobalt oxide and secondary battery, which is applied to the preparation of positive electrode materials for lithium ion secondary batteries and the preparation of lithium nickel cobalt oxide LiNi1-xCoxO2, can solve the problems of resource shortage, capacity decay, and fast decay speed, etc. Achieve the effect of shortening the roasting time, stabilizing the cycle performance and realizing the uniformity

Inactive Publication Date: 2006-10-11
CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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Problems solved by technology

The cathode material used in the first generation of lithium-ion secondary batteries is layered LiCoO 2 , this material has excellent performance, but there are shortages of resources and environmental pollution [Sung-Kyun Chang, Ho-Jin Kweon, Bo-Kyong Kim, et al.Journal of Power Sources, 2002, 104: 125]
Layered LiNiO 2 Although it has the advantages of easy availability of raw materials and less environmental pollution, due to the preparation of stoichiometric layered LiNiO 2 Very difficult, non-stoichiometric layered LiNiO 2 There are also shortcomings such as poor cycle performance, poor high temperature stability, and poor security that limit its commercial application [M.Guilmard, L.Croguennec, C.Delmas.Journal of The Electrochemical Society, 2003, 150 (10): A1287]
Spinel LiMn as cathode material for second-generation lithium-ion secondary batteries 2 o 4 Rich resources, low cost, environmental protection, high current charge and discharge, but there are still unfavorable factors such as the dissolution of manganese in the electrolyte and the Jahn-Teller deformation of the structure during deep discharge, resulting in poor cycle performance and low capacity. Fast decay [Yongyao Xia, Yunhong Zhou, Masaki Yoshio, Journal of The Electrochemical Society, 1997, 144(8): 2593]
However, LiNi synthesized by the traditional solid-phase method 1-x co x o 2 There is still the disadvantage of fast decay, and only by improving the synthesis method of the material can the electrochemical performance of the material be improved

Method used

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  • Method for preparing LiNi1-XCOXO2 of anode material of lithium ion secondary battery
  • Method for preparing LiNi1-XCOXO2 of anode material of lithium ion secondary battery
  • Method for preparing LiNi1-XCOXO2 of anode material of lithium ion secondary battery

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Embodiment 1

[0015] Dissolve 0.08 moles of nickel nitrate hexahydrate and 0.02 moles of cobalt nitrate hexahydrate in an appropriate amount of distilled water, stir, and keep the solution at a constant temperature in a water bath at 90°C. The dosage of sodium hydroxide and ammonium persulfate solution is suitable to completely co-precipitate and oxidize cobalt and nickel. The reaction system was allowed to stand overnight to complete the reaction, the obtained precipitate was separated by suction filtration, and the precipitate was washed with distilled water, so that the precipitate did not contain impurity ions such as sulfate radicals, and the washed precipitate was dried at 80 ° C to obtain Ni 1-x Co x OOH powder. Put this powder and lithium hydroxide monohydrate in a molar ratio of 1:1 in an agate mortar, add an appropriate amount of ethanol, and grind until the system becomes a rheological phase. The temperature was raised to 500°C, kept at a constant temperature for 10 hours, then...

Embodiment 2

[0017] The synthesis step is the same as in Example 1, except that the consumption of nickel nitrate hexahydrate is changed to 0.05 moles, the consumption of cobalt nitrate hexahydrate is changed to 0.05 moles, and the product is LiNi 0.5 Co 0.5 O 2 . The first discharge capacity of the assembled battery at 0.5C rate charge and discharge is 135mAhg -1 , the maximum discharge capacity is 142mAhg -1 , the discharge platform voltage is 3.6V, and the battery cycle stability is good.

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Abstract

The invention relates to a method for preparing LiNi1-xCoxO2 used as lithium-ion secondary battery anode material. It comprises following steps: dissolving nickel compounds and cobalt compounds into distilled water according to proportion; adding mixing solution of basic precipitant and oxidant and stirring strongly to make Co2+,Ni2+ deposite in form of Ni1-xCoxOOH; washing the deposition with distilled water and drying; mixing said deposition with lithium compounds, adding alcohol, water or mixture of that; grinding to make it be changed into flowing deformation phase pioneer matter; making lithium compound and Ni1-xCoxOOH mixed completely; drying said pioneer matter; and putting it into high temperature furnace, preheating, calcining, cooling and getting said LiNi1-xCoxO2. The invention is characterized by simple process, low cost, easy for industrial production, fine electrochemical property of got anode material and good circularity.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material for a lithium ion secondary battery, in particular to a lithium nickel cobalt oxide LiNi 1-x Co x O 2 The preparation method belongs to the technical field of battery materials. Background technique [0002] Since 1991, when SONY company put lithium-ion secondary batteries on the market, lithium-ion secondary batteries have occupied an increasingly important position in people's daily life. The cathode material used in the first generation of lithium-ion secondary batteries is layered LiCoO 2 , this material has excellent performance, but there are shortages of resources and pollution to the environment [Sung-Kyun Chang, Ho-Jin Kweon, Bo-Kyong Kim, et al. Journal of Power Sources, 2002, 104: 125]. Layered LiNiO 2 Although it has the advantages of easy availability of raw materials and little environmental pollution, it is difficult to prepare layered LiNiO with stoichio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G1/00H01M4/525
CPCY02E60/10
Inventor 刘心泉于霁夏雨
Owner CHENGDU ORGANIC CHEM CO LTD CHINESE ACAD OF SCI
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