Lithium ion battery and producing method thereof
A lithium-ion battery, pre-lithium intercalation technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as inability to improve cycle performance
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Embodiment P1
[0086] Positive electrode active material: NCM-111 purchased from BASF, HE-NCM prepared according to the method described in WO 2013 / 097186A1;
[0087] Negative electrode active material: a mixture of silicon nanoparticles with a diameter of 50 nm purchased from Alfa Aesar and graphite purchased from Shenzhen Kejing Zhida Technology Co., Ltd. (weight ratio 1:1);
[0088] Carbon additives: flake graphite KS6L and Super P carbon black C65, purchased from Timcal;
[0089] Binder: PAA, Mv=450,000, purchased from Sigma Aldrich;
[0090] Electrolyte: 1M LiPF 6 / EC (ethylene carbonate) + DMC (dimethyl carbonate) (volume ratio 1:1);
[0091] Separator: PP / PE / PP film Celgard 2325.
Embodiment P1-E1
[0093] The anode / Li half-cell was first assembled as a 2016 coin cell in an argon-filled glove box (MB-10compact, MBraun), using lithium metal as the counter electrode. The assembled anode / Li half-cell was discharged to the design pre-intercalation degree ε given in Table P1-E1, so that a specific amount of Li + The ions enter the negative electrode, that is, the pre-intercalated lithium of the negative electrode. Then disassemble the half-cell. The negative electrode with pre-intercalated lithium and the positive electrode of NCM-111 were assembled into a 2032 button-type full battery. The cycle performance of the full cells was evaluated on an Arbin battery test system at 25°C with formation at 0.1C and cycling at 1C.
[0094] Table P1-E1
[0095] Group
a
n 1
b
n 2
ε
c
x
n F
life
G0
2.30
90％
2.49
87％
0
1.00
1.08
83％
339
G1
2.30
90％
2.68
87％
5.6％
0.99
1.10
86％
...
Embodiment P1-E2
[0112] Embodiments P1-E2 were implemented similarly to Embodiments P1-E1, except that HE-NCM was used as the positive electrode active material, and the corresponding parameters were given in Tables P1-E2.
[0113] Table P1-E2
[0114] Group
a
n 1
b
n 2
ε
c
x
n F
life
G0
3.04
96％
3.25
87％
0
1.00
1.07
85％
136
G1
3.04
96％
4.09
87％
18.3％
0.90
1.10
94％
231
G2
3.04
96％
4.46
87％
26.3％
0.80
1.08
95％
316
[0115] a The initial delithiation capacity of the positive electrode [mAh / cm 2 ];
[0116] n 1 The initial Coulombic efficiency of the positive electrode;
[0117] b The initial lithium intercalation capacity of the negative electrode [mAh / cm 2 ];
[0118] n 2 The initial Coulombic efficiency of the negative electrode;
[0119] Pre-intercalated lithium degree of ε negative electrode;
[0120] c The depth of discharge of the ne...
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