Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material and preparation method thereof

A technology for positive electrode materials and raw materials, applied in the field of positive electrode materials and preparation, can solve the problems of affecting performance, low capacity retention rate of ternary positive electrode materials, low compaction, etc., and achieve improved performance, higher specific energy density, and high compaction density. Effect

Inactive Publication Date: 2017-06-30
宁夏科捷锂电池股份有限公司
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Problems solved by technology

[0002] Traditional LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary cathode material has the characteristics of low price, high discharge specific capacity, and stable cycle, but the commo

Method used

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Embodiment Construction

[0010] The embodiment of the present invention is doped with Sr and H 3 BO 3 LiNi 0.5 co 0.2 mn 0.3 o 2 The preparation and experimental steps of the cathode material are as follows:

[0011] 1. Ingredients: the ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 (battery grade) and lithium carbonate Li 2 CO 3 (battery grade) by stoichiometric ratio m(Li + ) / m(Ni 2+ +Co 2+ +Mn 2+ ) = 1.04:1 for batching, and then according to the mass doping ratio Sr 0.06% ~ 0.18% and boric acid H 3 BO 3 0.5%~1.2% with Sr(OH) 2 ·8H 2 O (analytical grade) and boric acid H 3 BO 3 (analytical pure); number the material after batching.

[0012] 2. Mixing: Put the weighed raw materials into the three-dimensional mixer according to the principle of "black and white", and add mixing balls (the mass ratio of the mixing balls is listed as Adding the mixing ball in this ratio can make the mixing uniform to the greatest extent), and carry out the mixing for 2 hours, and number after mixi...

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Abstract

The invention relates to a cathode material of a lithium ion battery and preparation of the cathode material, in particular to a Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material and a preparation method thereof. The Sr-and-H3BO3-doped LiNi0.5Co0.2Mn0.3O2 cathode material is prepared from the following raw materials: a ternary precursor Ni0.5Co0.2Mn0.3(OH)2, Li2CO3, Sr(OH)2.8H2O and H3BO3, wherein the stoichiometric ratio of the ternary precursor Ni0.5Co0.2Mn0.3(OH)2 to the Li2CO3 is m(Li<+>)/m(Ni<2+>+Co<2+>+Mn<2+>) which is equal to 1.04 to 1; the Sr doping content is 0.06 to 0.18 percent by mass; the H3BO3 doping content is 0.5 to 1.2 percent by mass; all the raw materials are prepared into the cathode material through high temperature solid phase sintering. Compared with a conventional ternary cathode material, the cathode material prepared through the preparation method is higher in compaction density, and the specific energy density is substantially increased, so that the full battery performance is effectively improved.

Description

technical field [0001] The invention relates to positive electrode materials and preparations of lithium ion batteries, specifically a kind of doped Sr and H 3 BO 3 LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material and preparation method thereof. Background technique [0002] Traditional LiNi 0.5 co 0.2 mn 0.3 o 2 The ternary cathode material has the characteristics of low price, high discharge specific capacity, and stable cycle, but the common 523 ternary cathode material has the disadvantages of low capacity retention rate and low compaction during multiple cycles, which affect the further improvement of its performance. . Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a kind of doped Sr and H that can increase the compaction density of the ternary positive electrode material and improve the performance of lithium-ion batteries. 3 BO 3 LiNi 0.5 co 0.2 mn 0.3 o 2 Cathode material and preparation meth...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 孙旭
Owner 宁夏科捷锂电池股份有限公司
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