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Lithium battery, lithium battery cathode material and manufacturing method thereof

A cathode material, lithium battery technology, applied in the field of electrochemistry, can solve the problems of poor rate performance and cycle performance, low discharge capacity, etc., and achieve the effect of good rate performance, cycle performance, and high discharge capacity

Active Publication Date: 2016-06-15
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The main technical problem to be solved by the present invention is to provide a lithium battery, a lithium battery positive electrode material and a manufacturing method thereof, so as to solve the problem that the existing lithium battery positive electrode material has a low discharge capacity when the cut-off voltage is less than 4.5V, and when the cut-off voltage is greater than 4.5V The problem of poor rate performance and cycle performance

Method used

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  • Lithium battery, lithium battery cathode material and manufacturing method thereof
  • Lithium battery, lithium battery cathode material and manufacturing method thereof
  • Lithium battery, lithium battery cathode material and manufacturing method thereof

Examples

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Embodiment 1

[0046] The lithium battery anode material that lithium battery adopts in the present embodiment is Li 1+a [Mn b (Mn x m 1-x ) 1-b ]O 2 ; Wherein: the value of a is 01+a [Mn b (Mn x m 1-x ) 1-b ]O 2 It is a spherical or quasi-spherical particle, and a single particle is composed of an inner core and an outer shell covering the inner core, the size of the particle is 2-20 μm, and the thickness of the outer shell is 5-2000 nm. See figure 1 and figure 2 The scanning electron microscope SEM image of the lithium battery positive electrode material shown; that is, the microscopic appearance of the positive electrode material prepared in this embodiment is spherical or spherical particles, and the spherical or spherical particles are composed of an inner core and an outer shell, forming a kind of The composite structure of the core and the shell can realize the complementary functions of the core and the shell through the synergistic effect of the core and the shell, so th...

Embodiment 2

[0051] In order to better understand the present invention, the present invention will be further described below in conjunction with a specific preparation method of the positive electrode material of a lithium battery; it should be understood that the positive electrode material in Example 1 is not limited to the following preparation method.

[0052] See Figure 8 As shown, the preparation method of lithium battery positive electrode material in the present embodiment comprises:

[0053] Step 801: Prepare spherical or spherical-like [Mn x m 1-x ](OH) 2 or [Mn x m 1-x ]CO 3 , which can also be referred to as the core material of the positive electrode material, wherein the M is at least one of Co, Ni, Al, Ti, Fe, Mg, Cr, and the value of x is 0≤x≤0.5;

[0054] Step 802: Prepare a lithium-containing Mn-based shell gel material, which can also be called the shell material of the positive electrode material; it is worth noting that there is no strict timing restriction be...

Embodiment 3

[0065] In this embodiment, nickel sulfate (NiSO 4 ·6H 2 O), manganese sulfate (MnSO 4 ·H 2 O), cobalt sulfate (NiSO 4 ·7H 2 O) prepare the core material as an example to illustrate, specifically as follows:

[0066] Step 1: nickel sulfate (NiSO 4 ·6H 2 O), manganese sulfate (MnSO 4 ·H 2 O), cobalt sulfate (NiSO 4 ·7H 2 O) Mix according to the ratio of Ni:Mn:Co (molar ratio)=1:1:1, dissolve in deionized water, and prepare a total metal ion concentration of 1.6mol / L (of course, it can also be configured as 0.1mol / L or 3.50.1mol / L) mixed salt solution A; 2 CO 3 Alkali solution and ammonia water with a concentration of 0.32mol / L;

[0067] Step 2: Add the mixed solution A into the reactor through a constant flow pump, Na 2 CO 3 Alkaline solution and ammonia water are respectively fed into the reaction kettle in parallel through a constant flow pump, and the stirring speed is controlled to be 1000rpm (or any other value between 50-1500rpm), and the reaction temperatur...

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Abstract

The invention discloses a lithium battery, a lithium battery anode material and a preparation method thereof. The preparation method includes: firstly preparing a sol-like Mn base shell gel material and spherical or spheroidic [MnxM1-x](OH)2 or [MnxM1-x]CO3, with the M being at least one of Co, Ni, Al, Ti, Fe, Mg and Cr, and with x being greater than or equal to 0 and smaller than or equal to 0.5; and then mixing the prepared spherical [MnxM1-x](OH)2 or [MnxM1-x]CO3 with the sol-like Mn base shell gel material, and conducting roasting and annealing treatment to obtain the lithium battery anode material Li1+a[Mnb(MnxM1-x)1-b]O2, with the a being greater than 0 and smaller to 1, and the b being greater than 0 and smaller to 1. The preparation process is simple and easy to control. Tests show that the lithium battery anode material provided by the invention has high discharge capacity when the voltage is smaller than 4.5V or greater than or equal to 4.5V, and also has good rate capability and cycle performance.

Description

technical field [0001] The invention relates to the field of electrochemistry, in particular to a lithium battery, a lithium battery cathode material and a manufacturing method thereof. Background technique [0002] Compared with traditional batteries, such as lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries, lithium-ion batteries have outstanding advantages such as high energy density, long cycle life, small self-discharge rate, no memory effect and environmental protection. After Sony developed it, lithium-ion batteries have been widely used in people's lives, such as portable electronic products, new energy vehicles, and energy storage. With the development of lithium-ion battery technology, lithium-ion batteries are required to have the characteristics of high energy density, high power, and low cost. The composition of lithium-ion batteries generally includes: positive electrode materials, negative electrode materials, electrolytes, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/485H01M4/505H01M4/525H01M10/052Y02E60/10
Inventor 王先友杨秀康王泽平李建邦袁好
Owner ZTE CORP
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