Positive electrode material of lithium cell, preparation method of positive electrode material and lithium cell

A lithium-ion battery, cathode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of low initial charge and discharge efficiency, low cycle performance, etc., and achieve high initial charge and discharge efficiency, high cycle performance, and technology. simple effect

Inactive Publication Date: 2012-09-19
BYD CO LTD
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention solves the technical problems of low cycle performance and low initial charge and discharge efficiency of lithium-ion batteries existing in the prior art

Method used

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  • Positive electrode material of lithium cell, preparation method of positive electrode material and lithium cell

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preparation example Construction

[0019] The present invention also provides a preparation method for the positive electrode material of the lithium ion battery, comprising the following steps:

[0020] 1) Formulated with Mn 4+ , M 3+ The aqueous solution is added to the water-soluble carbonate solution under stirring, and after the precipitation is complete, it is dried to obtain the layered composite solid solution precursor;

[0021] 2) Preparation of SnCl 4 In the organic solution, add ammonia water in the stirring state until the precipitation is complete, separate the organic phase after extraction, distill and dry to obtain SnO 2 Precursor;

[0022] 3) The layered composite solid solution precursor, SnO 2 The precursor and the lithium salt are uniformly mixed according to the stoichiometric ratio, and after pre-sintering, the sintering is continued in an oxygen atmosphere to obtain the lithium ion cathode material.

[0023] According to the preparation method of the present invention, first prepare...

Embodiment 1

[0047] (1) Preparation of cathode material S1

[0048] Prepare Ni according to stoichiometric ratio 2 (SO 4 ) 3 , Mn(SO 4 ) 2 , Mn 2 (SO 4 ) 3 The mixed aqueous solution was slowly added dropwise into the sodium carbonate solution under high-speed stirring to obtain a precipitate; the precipitate was dried at 108°C to obtain a mixed x Li 2 MnO 3 y LiMO 2 precursor material.

[0049] To 20mL SnCl 4 Add 5g of sodium lauryl sulfate to the solution (concentration: 1mol / L), then add 10mL of n-heptane and 10mL of n-pentane, stir evenly, and drop in 1mol / L ammonia solution while stirring until the precipitation is complete; 100mLCHCl 3 Extract and separate, keep the organic phase, wash with distilled water, distill to nearly dry, and then dry the water at 50°C under infrared light to obtain SnO 2 precursor material.

[0050] Will x Li 2 MnO 3 y LiMO 2 Precursor material, SnO 2 Precursor material, Li 2 CO 3 Mix uniformly according to the stoichiometric ratio ba...

Embodiment 2

[0056] Adopt the method identical with embodiment 1 to prepare cathode material S2 and lithium ion battery S22, difference is:

[0057] In step (1), SnO 2 The amount of precursor material changes, so that in the positive electrode material S2, the layered composite solid solution is Li 1.2 Ni 0.215 mn 0.585 o 2 , content 95wt%; SnO 2 Content 5wt%.

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Abstract

The invention provides a positive electrode material of a lithium cell. The positive electrode material is characterized by comprising a layered composite solid solution and SnO2 dispersed in the layered composite solid solution; the layered composite solid solution is xLi2MnO3*yLiMO2, wherein the M is selected from one or more of Mn, Ni, Co, Cr, Ti and Al, the x and the y are mole contents, and (2x+y)/(x+y) is larger than or equal to 1.2 and also smaller than or equal to 1.6; and in the layered composite solid solution, the content of the Mn is not less than 50% based on the total mole content of the Mn and the M. The invention further provides a preparation method of the positive electrode material of the lithium cell, and the lithium cell utilizing the positive electrode material. A cell prepared from the positive electrode material disclosed by the invention has high cycle performance and high first charge and discharge efficiency simultaneously.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] At present, almost all lithium-ion batteries on the market use layered LiCoO 2 as anode material. LiCoO 2 The synthesis is easy, but Co resources are limited and the cost is high; and LiCoO 2 The Li ion is extracted to obtain Li 1-m CoO 2 , when m>0.5, its structure undergoes irreversible changes, resulting in capacity decay, so the cycle performance of the battery is greatly reduced. lead to even LiCoO 2 The theoretical specific capacity is about 280mAh / g, but only about 150 mAh / g is actually used. [0003] Due to the continuous expansion of the application range of lithium-ion batteries and people's desire to reduce costs and environmental pollution, Ni and Mn-based materials with low price and low toxicity have attracted more a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/1391H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 李昕洋
Owner BYD CO LTD
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