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Preparation method of lithium battery positive electrode material having high specific discharge capacity

A positive electrode material and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low lithium ion diffusion coefficient and electronic conductivity, unsatisfactory material rate performance, and low initial charge and discharge efficiency. Achieve the effects of good high temperature and high current cycle characteristics, excellent rate cycle performance, and good cycle performance

Inactive Publication Date: 2020-06-19
河南海宏科技有限公司
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Problems solved by technology

[0004] At present, there are the following main aspects that restrict the development of positive electrode materials: the first charge and discharge efficiency is not high due to cation mixing; under high charge and discharge voltage, the positive electrode material may react with the electrolyte solution, resulting in poor cycle stability; The ion diffusion coefficient and electronic conductivity are low, which makes the rate performance of the material not very ideal

Method used

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  • Preparation method of lithium battery positive electrode material having high specific discharge capacity
  • Preparation method of lithium battery positive electrode material having high specific discharge capacity
  • Preparation method of lithium battery positive electrode material having high specific discharge capacity

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preparation example Construction

[0044] The present invention also provides a method for preparing the above-mentioned positive electrode material, comprising the following steps:

[0045] 1) Weigh the nickel source compound, cobalt source compound, and manganese source compound according to the stoichiometric ratio, and dissolve them in deionized water to prepare a cation mixed solution with a concentration of 2mol / L;

[0046] 2) According to the complexing agent and the cation concentration ratio in step 1) of 0.1-1.2:1, weigh the lactic acid complexing agent C 3 h 6 o 3 prepared as a solution;

[0047] 3) Weigh NaOH solution with a concentration of 2mol / L as a precipitant;

[0048] 4) Add the above three solutions into the reaction kettle at the same time through the peristaltic pump, adjust the feeding speed of the peristaltic pump to change the concentration ratio of the complexing agent and the cationic solution, and control the pH value of the mixed solution in the reaction kettle to always be kept ...

Embodiment 1

[0066] A preparation method of lithium battery cathode material with high discharge specific capacity is realized according to the following steps:

[0067] 1) Weigh a certain amount of nickel sulfate (NiSO 4 ·7H 2 O), cobalt sulfate (CoSO 4 ·6H 2 O) and manganese sulfate (MnSO 4 ·H 2 O), dissolved in deionized water to prepare a concentration of cation mixed solution of 2mol / L;

[0068] 2) Take a certain amount of lactic acid complexing agent C according to the ratio of complexing agent and cation concentration in step 1) of 1:1 3 h 6 o 3 prepared as a solution;

[0069] 3) Weigh a certain amount of NaOH solution with a concentration of 2mol / L as a precipitant;

[0070] 4) Add the above three solutions into the reaction kettle at the same time through the peristaltic pump, adjust the feeding speed of the peristaltic pump to change the concentration ratio of the complexing agent and the cationic solution, and control the pH of the mixed solution in the reaction kettle...

Embodiment 2

[0077] A preparation method of lithium battery cathode material with high discharge specific capacity is realized according to the following steps:

[0078] 1) Weigh a certain amount of nickel sulfate (NiSO 4 ·7H 2 O), cobalt sulfate (CoSO 4 ·6H 2 O) and manganese sulfate (MnSO 4 ·H 2 O), dissolved in deionized water to prepare a concentration of cation mixed solution of 2mol / L;

[0079] 2) Take a certain amount of lactic acid complexing agent C according to the ratio of complexing agent and cation concentration in step 1) of 1:1 3 h 6 o 3 prepared as a solution;

[0080] 3) Weigh a certain amount of NaOH solution with a concentration of 2mol / L as a precipitant;

[0081] 4) Add the above three solutions into the reaction kettle at the same time through the peristaltic pump, adjust the feeding speed of the peristaltic pump to change the concentration ratio of the complexing agent and the cationic solution, and control the pH of the mixed solution in the reaction kettle...

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Abstract

The invention discloses a preparation method of a lithium battery positive electrode material having high specific discharge capacity. The general formula of the positive electrode material is Li[Ni<x>Co<y>Mn<1-x-y>]<1-Z>V<Z>O<2>. The preparation method comprises the following steps: weighing a certain amount of nickel sulfate (NiSO<4>.7H<2>O), cobalt sulfate (CoSO<4>.6H<2>O) and manganese sulfate(MnSO<4>.H<2>O) according to a stoichiometric ratio, and dissolving in deionized water to prepare a cationic mixed solution with the concentration of 2mol / L; weighing a certain amount of lactic acidcomplexing agent C<3>H<6>O<3> according to the concentration ratio of the complexing agent to the cations in the step (1) being (0.1-1.2):1 to prepare a solution; and weighing a certain amount of NaOHsolution with the concentration of 2mol / L as a precipitator. Compared with the prior art, the positive electrode material prepared by the invention has the advantages of high capacity, good thermal stability, relatively low price, relatively low toxicity and the wide application prospect.

Description

technical field [0001] The invention relates to the technical field of lithium battery manufacturing, in particular to a method for preparing a positive electrode material of a lithium battery with high discharge specific capacity. Background technique [0002] Cathode material is one of the most important components of lithium-ion batteries, which determines the performance of lithium-ion batteries to a large extent. The current lithium-ion battery cathode materials are still in the early stages of development, and the price and performance of products cannot meet market demand. Therefore, it is urgent to research and develop low-cost, high-capacity cathode materials for lithium-ion batteries. With the continuous improvement of lithium battery technology, its application fields will be more extensive, which is of great significance to resource conservation, efficient use of energy, environmental protection and sustainable development. [0003] Electrode materials are an im...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李国光冯子穆徐亚峰牛佳
Owner 河南海宏科技有限公司
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