Secondary battery negative electrode active material, secondary battery negative electrode material, secondary battery negative electrode, secondary battery and activation method thereof
A negative electrode active material, secondary battery technology, applied in the direction of active material electrode, battery electrode, negative electrode, etc., can solve the problem that the performance of negative electrode active material cannot be met, the performance of negative electrode active material is general, etc., and achieve good cycle stability , the effect of improved electrochemical performance, high specific capacity and rate capability
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[0062] As an optional embodiment of the present invention, heteropolyacids include (NH 4 ) 2 h 8 MnV 13 o 38 and its hydrates, Na 2 h 8 MnV 13 o 38 and its hydrate, K 2 h 8 MnV 13 o 38 and its hydrate or Li 2 h 8 MnV 13 o 38 Any one or a combination of at least two of their hydrates;
[0063] It should be noted that (NH 4 ) 2 h 8 MnV 13 o 38 Hydrate, Na 2 h 8 MnV 13 o 38 Hydrate, K 2 h 8 MnV 13 o 38 Hydrates and Li 2 h 8 MnV 13 o 38 The amount of water of crystallization in the hydrate of is not specifically limited, and is generally related to its preparation method.
[0064] As an optional embodiment of the present invention, the heteropolyacid salt includes Na 2 h 8 MnV 13 o 38 and / or Na 2 h 8 MnV 13 o 38 12H 2 O, the "and / or" means that the heteropolyacid can only include Na 2 h 8 MnV 13 o 38 , or only include Na 2 h 8 MnV 13 o 38 12H 2 O, or both include Na 2 h 8 MnV 13 o 38 and Na 2 h 8 MnV 13 o 38 12H 2 O.
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Embodiment 1
[0128] This embodiment provides a secondary battery negative electrode material, including the following components in mass fraction:
[0129] Negative electrode active material 80%, conductive agent 10% and binder 10%;
[0130] Wherein, the negative electrode active material includes heteropolyacid salt, and heteropolyacid salt is (NH 4 ) 2 h 8 MnV 13 o 38 12H 2 O; the conductive agent is conductive carbon black; the binder is polyvinylidene fluoride.
[0131] Heteropolyacids (NH 4 ) 2 h 8 MnV 13 o 38 12H 2 The preparation method of O comprises the following steps:
[0132] (1) 6.08g ammonium metavanadate, 5mL 1.0M manganese sulfate solution and 70mL water were mixed and stirred for 0.5h to obtain the first solution;
[0133] (2) Add 10mL of absolute ethanol to the first solution and mix to produce small orange-yellow crystals, which are washed and filtered with cold water to obtain heteropolyacid salt (NH 4 ) 2 h 8 MnV 13 o 38 12H 2 O.
Embodiment 2
[0135] This embodiment provides a secondary battery negative electrode material, including the following components in mass fraction:
[0136] Negative electrode active material 68%, conductive agent 22% and binder 10%;
[0137] Wherein, the negative electrode active material includes heteropolyacid salt, and heteropolyacid salt is (NH 4 ) 2 h 8 MnV 13 o 38 12H 2 O, heteropolyacid salt (NH 4 ) 2 h 8 MnV 13 o 38 12H 2 The preparation method of O is the same as in Example 1; the conductive agent is conductive carbon black; the binder is polyvinylidene fluoride.
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